bootstrap-fileinput/js/fileinput.js

/*!
 * bootstrap-fileinput v4.4.6
 * http://plugins.krajee.com/file-input
 *
 * Author: Kartik Visweswaran
 * Copyright: 2014 - 2017, Kartik Visweswaran, Krajee.com
 *
 * Licensed under the BSD 3-Clause
 * https://github.com/kartik-v/bootstrap-fileinput/blob/master/LICENSE.md
 */
(function (factory) {
    "use strict";
    //noinspection JSUnresolvedVariable
    if (typeof define === 'function' && define.amd) { // jshint ignore:line
        // AMD. Register as an anonymous module.
        define(['jquery'], factory); // jshint ignore:line
    } else { // noinspection JSUnresolvedVariable
        if (typeof module === 'object' && module.exports) { // jshint ignore:line
            // Node/CommonJS
            // noinspection JSUnresolvedVariable
            module.exports = factory(require('jquery')); // jshint ignore:line
        } else {
            // Browser globals
            factory(window.jQuery);
        }
    }
}(function ($) {
    "use strict";

    $.fn.fileinputLocales = {};
    $.fn.fileinputThemes = {};

    String.prototype.setTokens = function (replacePairs) {
        var str = this.toString(), key, re;
        for (key in replacePairs) {
            if (replacePairs.hasOwnProperty(key)) {
                re = new RegExp("\{" + key + "\}", "g");
                str = str.replace(re, replacePairs[key]);
            }
        }
        return str;
    };

    var $h, FileInput;

    // fileinput helper object for all global variables and internal helper methods
    //noinspection JSUnresolvedVariable
    $h = {
        FRAMES: '.kv-preview-thumb',
        SORT_CSS: 'file-sortable',
        OBJECT_PARAMS: '<param name="controller" value="true" />\n' +
        '<param name="allowFullScreen" value="true" />\n' +
        '<param name="allowScriptAccess" value="always" />\n' +
        '<param name="autoPlay" value="false" />\n' +
        '<param name="autoStart" value="false" />\n' +
        '<param name="quality" value="high" />\n',
        DEFAULT_PREVIEW: '<div class="file-preview-other">\n' +
        '<span class="{previewFileIconClass}">{previewFileIcon}</span>\n' +
        '</div>',
        MODAL_ID: 'kvFileinputModal',
        MODAL_EVENTS: ['show', 'shown', 'hide', 'hidden', 'loaded'],
        objUrl: window.URL || window.webkitURL,
        compare: function (input, str, exact) {
            return input !== undefined && (exact ? input === str : input.match(str));
        },
        isIE: function (ver) {
            // check for IE versions < 11
            if (navigator.appName !== 'Microsoft Internet Explorer') {
                return false;
            }
            if (ver === 10) {
                return new RegExp('msie\\s' + ver, 'i').test(navigator.userAgent);
            }
            var div = document.createElement("div"), status;
            div.innerHTML = "<!--[if IE " + ver + "]> <i></i> <![endif]-->";
            status = div.getElementsByTagName("i").length;
            document.body.appendChild(div);
            div.parentNode.removeChild(div);
            return status;
        },
        initModal: function ($modal) {
            var $body = $('body');
            if ($body.length) {
                $modal.appendTo($body);
            }
        },
        isEmpty: function (value, trim) {
            return value === undefined || value === null || value.length === 0 || (trim && $.trim(value) === '');
        },
        isArray: function (a) {
            return Array.isArray(a) || Object.prototype.toString.call(a) === '[object Array]';
        },
        ifSet: function (needle, haystack, def) {
            def = def || '';
            return (haystack && typeof haystack === 'object' && needle in haystack) ? haystack[needle] : def;
        },
        cleanArray: function (arr) {
            if (!(arr instanceof Array)) {
                arr = [];
            }
            return arr.filter(function (e) {
                return (e !== undefined && e !== null);
            });
        },
        spliceArray: function (arr, index) {
            var i, j = 0, out = [];
            if (!(arr instanceof Array)) {
                return [];
            }
            for (i = 0; i < arr.length; i++) {
                if (i !== index) {
                    out[j] = arr[i];
                    j++;
                }
            }
            return out;
        },
        getNum: function (num, def) {
            def = def || 0;
            if (typeof num === "number") {
                return num;
            }
            if (typeof num === "string") {
                num = parseFloat(num);
            }
            return isNaN(num) ? def : num;
        },
        hasFileAPISupport: function () {
            return !!(window.File && window.FileReader);
        },
        hasDragDropSupport: function () {
            var div = document.createElement('div');
            /** @namespace div.draggable */
            /** @namespace div.ondragstart */
            /** @namespace div.ondrop */
            return !$h.isIE(9) &&
                (div.draggable !== undefined || (div.ondragstart !== undefined && div.ondrop !== undefined));
        },
        hasFileUploadSupport: function () {
            return $h.hasFileAPISupport() && window.FormData;
        },
        hasBlobSupport: function () {
            try {
                return !!window.Blob && Boolean(new Blob());
            } catch (e) {
                return false;
            }
        },
        hasArrayBufferViewSupport: function () {
            try {
                return new Blob([new Uint8Array(100)]).size === 100;
            } catch (e) {
                return false;
            }
        },
        dataURI2Blob: function (dataURI) {
            //noinspection JSUnresolvedVariable
            var BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder ||
                    window.MSBlobBuilder, canBlob = $h.hasBlobSupport(), byteStr, arrayBuffer, intArray, i, mimeStr, bb,
                canProceed = (canBlob || BlobBuilder) && window.atob && window.ArrayBuffer && window.Uint8Array;
            if (!canProceed) {
                return null;
            }
            if (dataURI.split(',')[0].indexOf('base64') >= 0) {
                byteStr = atob(dataURI.split(',')[1]);
            } else {
                byteStr = decodeURIComponent(dataURI.split(',')[1]);
            }
            arrayBuffer = new ArrayBuffer(byteStr.length);
            intArray = new Uint8Array(arrayBuffer);
            for (i = 0; i < byteStr.length; i += 1) {
                intArray[i] = byteStr.charCodeAt(i);
            }
            mimeStr = dataURI.split(',')[0].split(':')[1].split(';')[0];
            if (canBlob) {
                return new Blob([$h.hasArrayBufferViewSupport() ? intArray : arrayBuffer], {type: mimeStr});
            }
            bb = new BlobBuilder();
            bb.append(arrayBuffer);
            return bb.getBlob(mimeStr);
        },
        arrayBuffer2String: function (buffer) {
            //noinspection JSUnresolvedVariable
            if (window.TextDecoder) {
                return new TextDecoder("utf-8").decode(buffer);
            }
            var array = Array.prototype.slice.apply(new Uint8Array(buffer)), out = '', i = 0, len, c, char2, char3;
            len = array.length;
            while (i < len) {
                c = array[i++];
                switch (c >> 4) { // jshint ignore:line
                    case 0:
                    case 1:
                    case 2:
                    case 3:
                    case 4:
                    case 5:
                    case 6:
                    case 7:
                        // 0xxxxxxx
                        out += String.fromCharCode(c);
                        break;
                    case 12:
                    case 13:
                        // 110x xxxx   10xx xxxx
                        char2 = array[i++];
                        out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F)); // jshint ignore:line
                        break;
                    case 14:
                        // 1110 xxxx  10xx xxxx  10xx xxxx
                        char2 = array[i++];
                        char3 = array[i++];
                        out += String.fromCharCode(((c & 0x0F) << 12) | // jshint ignore:line
                            ((char2 & 0x3F) << 6) |  // jshint ignore:line
                            ((char3 & 0x3F) << 0)); // jshint ignore:line
                        break;
                }
            }
            return out;
        },
        isHtml: function (str) {
            var a = document.createElement('div');
            a.innerHTML = str;
            for (var c = a.childNodes, i = c.length; i--;) {
                if (c[i].nodeType === 1) {
                    return true;
                }
            }
            return false;
        },
        isSvg: function (str) {
            return str.match(/^\s*<\?xml/i) && (str.match(/<!DOCTYPE svg/i) || str.match(/<svg/i));
        },
        getMimeType: function (signature, contents, type) {
            switch (signature) {
                case "ffd8ffe0":
                case "ffd8ffe1":
                case "ffd8ffe2":
                    return 'image/jpeg';
                case '89504E47':
                    return 'image/png';
                case '47494638':
                    return 'image/gif';
                case '49492a00':
                    return 'image/tiff';
                case '52494646':
                    return 'image/webp';
                case '66747970':
                    return 'video/3gp';
                case '4f676753':
                    return 'video/ogg';
                case '1a45dfa3':
                    return 'video/mkv';
                case '000001ba':
                case '000001b3':
                    return 'video/mpeg';
                case '3026b275':
                    return 'video/wmv';
                case '25504446':
                    return 'application/pdf';
                case '25215053':
                    return 'application/ps';
                case '504b0304':
                case '504b0506':
                case '504b0508':
                    return 'application/zip';
                case '377abcaf':
                    return 'application/7z';
                case '75737461':
                    return 'application/tar';
                case '7801730d':
                    return 'application/dmg';
                default:
                    switch (signature.substring(0, 6)) {
                        case '435753':
                            return 'application/x-shockwave-flash';
                        case '494433':
                            return 'audio/mp3';
                        case '425a68':
                            return 'application/bzip';
                        default:
                            switch (signature.substring(0, 4)) {
                                case '424d':
                                    return 'image/bmp';
                                case 'fffb':
                                    return 'audio/mp3';
                                case '4d5a':
                                    return 'application/exe';
                                case '1f9d':
                                case '1fa0':
                                    return 'application/zip';
                                case '1f8b':
                                    return 'application/gzip';
                                default:
                                    return contents && !contents.match(/[^\u0000-\u007f]/) ? 'application/text-plain' : type;
                            }
                    }
            }
        },
        addCss: function ($el, css) {
            $el.removeClass(css).addClass(css);
        },
        getElement: function (options, param, value) {
            return ($h.isEmpty(options) || $h.isEmpty(options[param])) ? value : $(options[param]);
        },
        uniqId: function () {
            return Math.round(new Date().getTime()) + '_' + Math.round(Math.random() * 100);
        },
        htmlEncode: function (str) {
            return str.replace(/&/g, '&amp;')
                .replace(/</g, '&lt;')
                .replace(/>/g, '&gt;')
                .replace(/"/g, '&quot;')
                .replace(/'/g, '&apos;');
        },
        replaceTags: function (str, tags) {
            var out = str;
            if (!tags) {
                return out;
            }
            $.each(tags, function (key, value) {
                if (typeof value === "function") {
                    value = value();
                }
                out = out.split(key).join(value);
            });
            return out;
        },
        cleanMemory: function ($thumb) {
            var data = $thumb.is('img') ? $thumb.attr('src') : $thumb.find('source').attr('src');
            /** @namespace $h.objUrl.revokeObjectURL */
            $h.objUrl.revokeObjectURL(data);
        },
        findFileName: function (filePath) {
            var sepIndex = filePath.lastIndexOf('/');
            if (sepIndex === -1) {
                sepIndex = filePath.lastIndexOf('\\');
            }
            return filePath.split(filePath.substring(sepIndex, sepIndex + 1)).pop();
        },
        checkFullScreen: function () {
            //noinspection JSUnresolvedVariable
            return document.fullscreenElement || document.mozFullScreenElement || document.webkitFullscreenElement ||
                document.msFullscreenElement;
        },
        toggleFullScreen: function (maximize) {
            var doc = document, de = doc.documentElement;
            if (de && maximize && !$h.checkFullScreen()) {
                /** @namespace document.requestFullscreen */
                /** @namespace document.msRequestFullscreen */
                /** @namespace document.mozRequestFullScreen */
                /** @namespace document.webkitRequestFullscreen */
                /** @namespace Element.ALLOW_KEYBOARD_INPUT */
                if (de.requestFullscreen) {
                    de.requestFullscreen();
                } else if (de.msRequestFullscreen) {
                    de.msRequestFullscreen();
                } else if (de.mozRequestFullScreen) {
                    de.mozRequestFullScreen();
                } else if (de.webkitRequestFullscreen) {
                    de.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
                }
            } else {
                /** @namespace document.exitFullscreen */
                /** @namespace document.msExitFullscreen */
                /** @namespace document.mozCancelFullScreen */
                /** @namespace document.webkitExitFullscreen */
                if (doc.exitFullscreen) {
                    doc.exitFullscreen();
                } else if (doc.msExitFullscreen) {
                    doc.msExitFullscreen();
                } else if (doc.mozCancelFullScreen) {
                    doc.mozCancelFullScreen();
                } else if (doc.webkitExitFullscreen) {
                    doc.webkitExitFullscreen();
                }
            }
        },
        moveArray: function (arr, oldIndex, newIndex) {
            if (newIndex >= arr.length) {
                var k = newIndex - arr.length;
                while ((k--) + 1) {
                    arr.push(undefined);
                }
            }
            arr.splice(newIndex, 0, arr.splice(oldIndex, 1)[0]);
            return arr;
        },
        cleanZoomCache: function ($el) {
            var $cache = $el.closest('.kv-zoom-cache-theme');
            if (!$cache.length) {
                $cache = $el.closest('.kv-zoom-cache');
            }
            $cache.remove();
        },
        setOrientation: function (buffer, callback) {
            var scanner = new DataView(buffer), idx = 0, value = 1, // Non-rotated is the default
                maxBytes, uInt16, exifLength;
            if (scanner.getUint16(idx) !== 0xFFD8 || buffer.length < 2) { // not a proper JPEG
                if (callback) {
                    callback();
                }
                return;
            }
            idx += 2;
            maxBytes = scanner.byteLength;
            while (idx < maxBytes - 2) {
                uInt16 = scanner.getUint16(idx);
                idx += 2;
                switch (uInt16) {
                    case 0xFFE1: // Start of EXIF
                        exifLength = scanner.getUint16(idx);
                        maxBytes = exifLength - idx;
                        idx += 2;
                        break;
                    case 0x0112: // Orientation tag
                        value = scanner.getUint16(idx + 6, false);
                        maxBytes = 0; // Stop scanning
                        break;
                }
            }
            if (callback) {
                callback(value);
            }
        },
        validateOrientation: function (file, callback) {
            if (!window.FileReader || !window.DataView) {
                return; // skip orientation if pre-requisite libraries not supported by browser
            }
            var reader = new FileReader(), buffer;
            reader.onloadend = function () {
                buffer = reader.result;
                $h.setOrientation(buffer, callback);
            };
            reader.readAsArrayBuffer(file);
        },
        adjustOrientedImage: function ($img, isZoom) {
            var offsetContTop, offsetTop, newTop;
            if (!$img.hasClass('is-portrait-gt4')) {
                return;
            }
            if (isZoom) {
                $img.css({width: $img.parent().height()});
                return;
            } else {
                $img.css({height: 'auto', width: $img.height()});
            }
            offsetContTop = $img.parent().offset().top;
            offsetTop = $img.offset().top;
            newTop = offsetContTop - offsetTop;
            $img.css('margin-top', newTop);
        }
    };
    FileInput = function (element, options) {
        var self = this;
        self.$element = $(element);
        self.$parent = self.$element.parent();
        if (!self._validate()) {
            return;
        }
        self.isPreviewable = $h.hasFileAPISupport();
        self.isIE9 = $h.isIE(9);
        self.isIE10 = $h.isIE(10);
        if (self.isPreviewable || self.isIE9) {
            self._init(options);
            self._listen();
        }
        self.$element.removeClass('file-loading');
    };
    //noinspection JSUnusedGlobalSymbols
    FileInput.prototype = {
        constructor: FileInput,
        _cleanup: function () {
            var self = this;
            self.reader = null;
            self.formdata = {};
            self.uploadCount = 0;
            self.uploadStatus = {};
            self.uploadLog = [];
            self.uploadAsyncCount = 0;
            self.loadedImages = [];
            self.totalImagesCount = 0;
            self.ajaxRequests = [];
            self.clearStack();
            self.fileInputCleared = false;
            self.fileBatchCompleted = true;
            if (!self.isPreviewable) {
                self.showPreview = false;
            }
            self.isError = false;
            self.ajaxAborted = false;
            self.cancelling = false;
        },
        _init: function (options, refreshMode) {
            var self = this, f, $el = self.$element, $cont, t, tmp;
            self.options = options;
            $.each(options, function (key, value) {
                switch (key) {
                    case 'minFileCount':
                    case 'maxFileCount':
                    case 'minFileSize':
                    case 'maxFileSize':
                    case 'maxFilePreviewSize':
                    case 'resizeImageQuality':
                    case 'resizeIfSizeMoreThan':
                    case 'progressUploadThreshold':
                    case 'initialPreviewCount':
                    case 'zoomModalHeight':
                    case 'minImageHeight':
                    case 'maxImageHeight':
                    case 'minImageWidth':
                    case 'maxImageWidth':
                        self[key] = $h.getNum(value);
                        break;
                    default:
                        self[key] = value;
                        break;
                }
            });
            if (self.rtl) { // swap buttons for rtl
                tmp = self.previewZoomButtonIcons.prev;
                self.previewZoomButtonIcons.prev = self.previewZoomButtonIcons.next;
                self.previewZoomButtonIcons.next = tmp;
            }
            if (!refreshMode) {
                self._cleanup();
            }
            self.$form = $el.closest('form');
            self._initTemplateDefaults();
            self.uploadFileAttr = !$h.isEmpty($el.attr('name')) ? $el.attr('name') : 'file_data';
            t = self._getLayoutTemplate('progress');
            self.progressTemplate = t.replace('{class}', self.progressClass);
            self.progressCompleteTemplate = t.replace('{class}', self.progressCompleteClass);
            self.progressErrorTemplate = t.replace('{class}', self.progressErrorClass);
            self.dropZoneEnabled = $h.hasDragDropSupport() && self.dropZoneEnabled;
            self.isDisabled = $el.attr('disabled') || $el.attr('readonly');
            if (self.isDisabled) {
                $el.attr('disabled', true);
            }
            self.isAjaxUpload = $h.hasFileUploadSupport() && !$h.isEmpty(self.uploadUrl);
            self.isClickable = self.browseOnZoneClick && self.showPreview &&
                (self.isAjaxUpload && self.dropZoneEnabled || !$h.isEmpty(self.defaultPreviewContent));
            self.slug = typeof options.slugCallback === "function" ? options.slugCallback : self._slugDefault;
            self.mainTemplate = self.showCaption ? self._getLayoutTemplate('main1') : self._getLayoutTemplate('main2');
            self.captionTemplate = self._getLayoutTemplate('caption');
            self.previewGenericTemplate = self._getPreviewTemplate('generic');
            if (!self.imageCanvas && self.resizeImage && (self.maxImageWidth || self.maxImageHeight)) {
                self.imageCanvas = document.createElement('canvas');
                self.imageCanvasContext = self.imageCanvas.getContext('2d');
            }
            if ($h.isEmpty($el.attr('id'))) {
                $el.attr('id', $h.uniqId());
            }
            self.namespace = '.fileinput_' + $el.attr('id').replace(/-/g, '_');
            if (self.$container === undefined) {
                self.$container = self._createContainer();
            } else {
                self._refreshContainer();
            }
            $cont = self.$container;
            self.$dropZone = $cont.find('.file-drop-zone');
            self.$progress = $cont.find('.kv-upload-progress');
            self.$btnUpload = $cont.find('.fileinput-upload');
            self.$captionContainer = $h.getElement(options, 'elCaptionContainer', $cont.find('.file-caption'));
            self.$caption = $h.getElement(options, 'elCaptionText', $cont.find('.file-caption-name'));
            if (!$h.isEmpty(self.msgPlaceholder)) {
                f = $el.attr('multiple') ? self.filePlural : self.fileSingle;
                self.$caption.attr('placeholder', self.msgPlaceholder.replace('{files}', f));
            }
            self.$captionIcon = self.$captionContainer.find('.file-caption-icon');
            if (self.mainClass.indexOf('input-group-lg') > -1) {
                $h.addCss(self.$captionIcon, 'icon-lg');
            } else {
                self.$captionIcon.removeClass('icon-lg');
            }
            self.$previewContainer = $h.getElement(options, 'elPreviewContainer', $cont.find('.file-preview'));
            self.$preview = $h.getElement(options, 'elPreviewImage', $cont.find('.file-preview-thumbnails'));
            self.$previewStatus = $h.getElement(options, 'elPreviewStatus', $cont.find('.file-preview-status'));
            self.$errorContainer = $h.getElement(options, 'elErrorContainer',
                self.$previewContainer.find('.kv-fileinput-error'));
            self._validateDisabled();
            if (!$h.isEmpty(self.msgErrorClass)) {
                $h.addCss(self.$errorContainer, self.msgErrorClass);
            }
            if (!refreshMode) {
                self.$errorContainer.hide();
                self.previewInitId = "preview-" + $h.uniqId();
                self._initPreviewCache();
                self._initPreview(true);
                self._initPreviewActions();
                self._setFileDropZoneTitle();
                if (self.$parent.hasClass('file-loading')) {
                    self.$container.insertBefore(self.$parent);
                    self.$parent.remove();
                }
            }
            if ($el.attr('disabled')) {
                self.disable();
            }
            self._initZoom();
            if (self.hideThumbnailContent) {
                $h.addCss(self.$preview, 'hide-content');
            }
        },
        _initTemplateDefaults: function () {
            var self = this, tMain1, tMain2, tPreview, tFileIcon, tClose, tCaption, tBtnDefault, tBtnLink, tBtnBrowse,
                tModalMain, tModal, tProgress, tSize, tFooter, tActions, tActionDelete, tActionUpload, tActionDownload,
                tActionZoom, tActionDrag, tIndicator, tTagBef, tTagBef1, tTagBef2, tTagAft, tGeneric, tHtml, tImage,
                tText, tVideo, tAudio, tFlash, tObject, tPdf, tOther, tZoomCache, vDefaultDim;
            tMain1 = '{preview}\n' +
                '<div class="kv-upload-progress kv-hidden"></div><div class="clearfix"></div>\n' +
                '<div class="input-group {class}">\n' +
                '  {caption}\n' +
                '<div class="input-group-btn">\n' +
                '      {remove}\n' +
                '      {cancel}\n' +
                '      {upload}\n' +
                '      {browse}\n' +
                '    </div>\n' +
                '</div>';
            tMain2 = '{preview}\n<div class="kv-upload-progress kv-hidden"></div>\n<div class="clearfix"></div>\n{remove}\n{cancel}\n{upload}\n{browse}\n';
            tPreview = '<div class="file-preview {class}">\n' +
                '    {close}' +
                '    <div class="{dropClass}">\n' +
                '    <div class="file-preview-thumbnails">\n' +
                '    </div>\n' +
                '    <div class="clearfix"></div>' +
                '    <div class="file-preview-status text-center text-success"></div>\n' +
                '    <div class="kv-fileinput-error"></div>\n' +
                '    </div>\n' +
                '</div>';
            tClose = '<button type="button" class="close fileinput-remove">&times;</button>\n';
            tFileIcon = '<i class="glyphicon glyphicon-file"></i>';
            tCaption = '<div class="file-caption form-control {class}" tabindex="500">\n' +
                '  <span class="file-caption-icon"></span>\n' +
                '  <input class="file-caption-name" onkeydown="return false;" onpaste="return false;">\n' +
                '</div>';
            //noinspection HtmlUnknownAttribute
            tBtnDefault = '<button type="{type}" tabindex="500" title="{title}" class="{css}" ' +
                '{status}>{icon} {label}</button>';
            //noinspection HtmlUnknownAttribute
            tBtnLink = '<a href="{href}" tabindex="500" title="{title}" class="{css}" {status}>{icon} {label}</a>';
            //noinspection HtmlUnknownAttribute
            tBtnBrowse = '<div tabindex="500" class="{css}" {status}>{icon} {label}</div>';
            tModalMain = '<div id="' + $h.MODAL_ID + '" class="file-zoom-dialog modal fade" ' +
                'tabindex="-1" aria-labelledby="' + $h.MODAL_ID + 'Label"></div>';
            tModal = '<div class="modal-dialog modal-lg{rtl}" role="document">\n' +
                '  <div class="modal-content">\n' +
                '    <div class="modal-header">\n' +
                '      <h5 class="modal-title">{heading}</h5>\n' +
                '      <span class="kv-zoom-title"></span>\n' +
                '      <div class="kv-zoom-actions">{toggleheader}{fullscreen}{borderless}{close}</div>\n' +
                '    </div>\n' +
                '    <div class="modal-body">\n' +
                '      <div class="floating-buttons"></div>\n' +
                '      <div class="kv-zoom-body file-zoom-content {zoomFrameClass}"></div>\n' + '{prev} {next}\n' +
                '    </div>\n' +
                '  </div>\n' +
                '</div>\n';
            tProgress = '<div class="progress">\n' +
                '    <div class="{class}" role="progressbar"' +
                ' aria-valuenow="{percent}" aria-valuemin="0" aria-valuemax="100" style="width:{percent}%;">\n' +
                '        {status}\n' +
                '     </div>\n' +
                '</div>';
            tSize = ' <samp>({sizeText})</samp>';
            tFooter = '<div class="file-thumbnail-footer">\n' +
                '    <div class="file-footer-caption" title="{caption}">\n' +
                '        <div class="file-caption-info">{caption}</div>\n' +
                '        <div class="file-size-info">{size}</div>\n' +
                '    </div>\n' +
                '    {progress}\n{indicator}\n{actions}\n' +
                '</div>';
            tActions = '<div class="file-actions">\n' +
                '    <div class="file-footer-buttons">\n' +
                '        {download} {upload} {delete} {zoom} {other}' +
                '    </div>\n' +
                '</div>\n' +
                '{drag}\n' +
                '<div class="clearfix"></div>';
            //noinspection HtmlUnknownAttribute
            tActionDelete = '<button type="button" class="kv-file-remove {removeClass}" ' +
                'title="{removeTitle}" {dataUrl}{dataKey}>{removeIcon}</button>\n';
            tActionUpload = '<button type="button" class="kv-file-upload {uploadClass}" title="{uploadTitle}">' +
                '{uploadIcon}</button>';
            tActionDownload = '<a href="{downloadUrl}" class="{downloadClass}" title="{downloadTitle}" ' +
                'download="{caption}">{downloadIcon}</a>';
            tActionZoom = '<button type="button" class="kv-file-zoom {zoomClass}" ' +
                'title="{zoomTitle}">{zoomIcon}</button>';
            tActionDrag = '<span class="file-drag-handle {dragClass}" title="{dragTitle}">{dragIcon}</span>';
            tIndicator = '<div class="file-upload-indicator" title="{indicatorTitle}">{indicator}</div>';
            tTagBef = '<div class="file-preview-frame {frameClass}" id="{previewId}" data-fileindex="{fileindex}"' +
                ' data-template="{template}"';
            tTagBef1 = tTagBef + '><div class="kv-file-content">\n';
            tTagBef2 = tTagBef + ' title="{caption}"><div class="kv-file-content">\n';
            tTagAft = '</div>{footer}\n</div>\n';
            tGeneric = '{content}\n';
            tHtml = '<div class="kv-preview-data file-preview-html" title="{caption}" {style}>{data}</div>\n';
            tImage = '<img src="{data}" class="file-preview-image kv-preview-data" title="{caption}" ' +
                'alt="{caption}" {style}>\n';
            tText = '<textarea class="kv-preview-data file-preview-text" title="{caption}" readonly {style}>' +
                '{data}</textarea>\n';
            tVideo = '<video class="kv-preview-data file-preview-video" controls {style}>\n' +
                '<source src="{data}" type="{type}">\n' + $h.DEFAULT_PREVIEW + '\n</video>\n';
            tAudio = '<audio class="kv-preview-data file-preview-audio" controls {style}>\n<source src="{data}" ' +
                'type="{type}">\n' + $h.DEFAULT_PREVIEW + '\n</audio>\n';
            tFlash = '<embed class="kv-preview-data file-preview-flash" src="{data}" type="application/x-shockwave-flash" {style}>\n';
            tPdf = '<embed class="kv-preview-data file-preview-pdf" src="{data}" type="application/pdf" {style}>\n';
            tObject = '<object class="kv-preview-data file-preview-object file-object {typeCss}" ' +
                'data="{data}" type="{type}" {style}>\n' + '<param name="movie" value="{caption}" />\n' +
                $h.OBJECT_PARAMS + ' ' + $h.DEFAULT_PREVIEW + '\n</object>\n';
            tOther = '<div class="kv-preview-data file-preview-other-frame" {style}>\n' + $h.DEFAULT_PREVIEW + '\n</div>\n';
            tZoomCache = '<div class="kv-zoom-cache" style="display:none">{zoomContent}</div>';
            vDefaultDim = {width: "100%", height: "100%", 'min-height': "480px"};
            self.defaults = {
                layoutTemplates: {
                    main1: tMain1,
                    main2: tMain2,
                    preview: tPreview,
                    close: tClose,
                    fileIcon: tFileIcon,
                    caption: tCaption,
                    modalMain: tModalMain,
                    modal: tModal,
                    progress: tProgress,
                    size: tSize,
                    footer: tFooter,
                    indicator: tIndicator,
                    actions: tActions,
                    actionDelete: tActionDelete,
                    actionUpload: tActionUpload,
                    actionDownload: tActionDownload,
                    actionZoom: tActionZoom,
                    actionDrag: tActionDrag,
                    btnDefault: tBtnDefault,
                    btnLink: tBtnLink,
                    btnBrowse: tBtnBrowse,
                    zoomCache: tZoomCache
                },
                previewMarkupTags: {
                    tagBefore1: tTagBef1,
                    tagBefore2: tTagBef2,
                    tagAfter: tTagAft
                },
                previewContentTemplates: {
                    generic: tGeneric,
                    html: tHtml,
                    image: tImage,
                    text: tText,
                    video: tVideo,
                    audio: tAudio,
                    flash: tFlash,
                    object: tObject,
                    pdf: tPdf,
                    other: tOther
                },
                allowedPreviewTypes: ['image', 'html', 'text', 'video', 'audio', 'flash', 'pdf', 'object'],
                previewTemplates: {},
                previewSettings: {
                    image: {width: "auto", height: "auto", 'max-width': "100%", 'max-height': "100%"},
                    html: {width: "213px", height: "160px"},
                    text: {width: "213px", height: "160px"},
                    video: {width: "213px", height: "160px"},
                    audio: {width: "100%", height: "30px"},
                    flash: {width: "213px", height: "160px"},
                    object: {width: "213px", height: "160px"},
                    pdf: {width: "213px", height: "160px"},
                    other: {width: "213px", height: "160px"}
                },
                previewSettingsSmall: {
                    image: {width: "auto", height: "auto", 'max-width': "100%", 'max-height': "100%"},
                    html: {width: "100%", height: "160px"},
                    text: {width: "100%", height: "160px"},
                    video: {width: "100%", height: "auto"},
                    audio: {width: "100%", height: "30px"},
                    flash: {width: "100%", height: "auto"},
                    object: {width: "100%", height: "auto"},
                    pdf: {width: "100%", height: "160px"},
                    other: {width: "100%", height: "160px"}
                },
                previewZoomSettings: {
                    image: {width: "auto", height: "auto", 'max-width': "100%", 'max-height': "100%"},
                    html: vDefaultDim,
                    text: vDefaultDim,
                    video: {width: "auto", height: "100%", 'max-width': "100%"},
                    audio: {width: "100%", height: "30px"},
                    flash: {width: "auto", height: "480px"},
                    object: {width: "auto", height: "100%", 'max-width': "100%", 'min-height': "480px"},
                    pdf: vDefaultDim,
                    other: {width: "auto", height: "100%", 'min-height': "480px"}
                },
                fileTypeSettings: {
                    image: function (vType, vName) {
                        return $h.compare(vType, 'image.*') || $h.compare(vName, /\.(gif|png|jpe?g)$/i);
                    },
                    html: function (vType, vName) {
                        return $h.compare(vType, 'text/html') || $h.compare(vName, /\.(htm|html)$/i);
                    },
                    text: function (vType, vName) {
                        return $h.compare(vType, 'text.*') || $h.compare(vName, /\.(xml|javascript)$/i) ||
                            $h.compare(vName, /\.(txt|md|csv|nfo|ini|json|php|js|css)$/i);
                    },
                    video: function (vType, vName) {
                        return $h.compare(vType, 'video.*') && ($h.compare(vType, /(ogg|mp4|mp?g|mov|webm|3gp)$/i) ||
                            $h.compare(vName, /\.(og?|mp4|webm|mp?g|mov|3gp)$/i));
                    },
                    audio: function (vType, vName) {
                        return $h.compare(vType, 'audio.*') && ($h.compare(vName, /(ogg|mp3|mp?g|wav)$/i) ||
                            $h.compare(vName, /\.(og?|mp3|mp?g|wav)$/i));
                    },
                    flash: function (vType, vName) {
                        return $h.compare(vType, 'application/x-shockwave-flash', true) || $h.compare(vName, /\.(swf)$/i);
                    },
                    pdf: function (vType, vName) {
                        return $h.compare(vType, 'application/pdf', true) || $h.compare(vName, /\.(pdf)$/i);
                    },
                    object: function () {
                        return true;
                    },
                    other: function () {
                        return true;
                    }
                },
                fileActionSettings: {
                    showRemove: true,
                    showUpload: true,
                    showDownload: true,
                    showZoom: true,
                    showDrag: true,
                    removeIcon: '<i class="glyphicon glyphicon-trash"></i>',
                    removeClass: 'btn btn-kv btn-default btn-outline-secondary',
                    removeErrorClass: 'btn btn-kv btn-danger',
                    removeTitle: 'Remove file',
                    uploadIcon: '<i class="glyphicon glyphicon-upload"></i>',
                    uploadClass: 'btn btn-kv btn-default btn-outline-secondary',
                    uploadTitle: 'Upload file',
                    uploadRetryIcon: '<i class="glyphicon glyphicon-repeat"></i>',
                    uploadRetryTitle: 'Retry upload',
                    downloadIcon: '<i class="glyphicon glyphicon-download"></i>',
                    downloadClass: 'btn btn-kv btn-default btn-outline-secondary',
                    downloadTitle: 'Download file',
                    zoomIcon: '<i class="glyphicon glyphicon-zoom-in"></i>',
                    zoomClass: 'btn btn-kv btn-default btn-outline-secondary',
                    zoomTitle: 'View Details',
                    dragIcon: '<i class="glyphicon glyphicon-move"></i>',
                    dragClass: 'text-info',
                    dragTitle: 'Move / Rearrange',
                    dragSettings: {},
                    indicatorNew: '<i class="glyphicon glyphicon-plus-sign text-warning"></i>',
                    indicatorSuccess: '<i class="glyphicon glyphicon-ok-sign text-success"></i>',
                    indicatorError: '<i class="glyphicon glyphicon-exclamation-sign text-danger"></i>',
                    indicatorLoading: '<i class="glyphicon glyphicon-hourglass text-muted"></i>',
                    indicatorNewTitle: 'Not uploaded yet',
                    indicatorSuccessTitle: 'Uploaded',
                    indicatorErrorTitle: 'Upload Error',
                    indicatorLoadingTitle: 'Uploading ...'
                }
            };
            $.each(self.defaults, function (key, setting) {
                if (key === 'allowedPreviewTypes') {
                    if (self.allowedPreviewTypes === undefined) {
                        self.allowedPreviewTypes = setting;
                    }
                    return;
                }
                self[key] = $.extend(true, {}, setting, self[key]);
            });
            self._initPreviewTemplates();
        },
        _initPreviewTemplates: function () {
            var self = this, cfg = self.defaults, tags = self.previewMarkupTags, tagBef, tagAft = tags.tagAfter;
            $.each(cfg.previewContentTemplates, function (key, value) {
                if ($h.isEmpty(self.previewTemplates[key])) {
                    tagBef = tags.tagBefore2;
                    if (key === 'generic' || key === 'image' || key === 'html' || key === 'text') {
                        tagBef = tags.tagBefore1;
                    }
                    self.previewTemplates[key] = tagBef + value + tagAft;
                }
            });
        },
        _initPreviewCache: function () {
            var self = this;
            self.previewCache = {
                data: {},
                init: function () {
                    var content = self.initialPreview;
                    if (content.length > 0 && !$h.isArray(content)) {
                        content = content.split(self.initialPreviewDelimiter);
                    }
                    self.previewCache.data = {
                        content: content,
                        config: self.initialPreviewConfig,
                        tags: self.initialPreviewThumbTags
                    };
                },
                count: function () {
                    return !!self.previewCache.data && !!self.previewCache.data.content ?
                        self.previewCache.data.content.length : 0;
                },
                get: function (i, isDisabled) {
                    var ind = 'init_' + i, data = self.previewCache.data, config = data.config[i],
                        content = data.content[i], previewId = self.previewInitId + '-' + ind, out, $tmp, cat, ftr,
                        fname, ftype, frameClass, asData = $h.ifSet('previewAsData', config, self.initialPreviewAsData),
                        parseTemplate = function (cat, dat, fn, ft, id, ftr, ind, fc, t) {
                            fc = ' file-preview-initial ' + $h.SORT_CSS + (fc ? ' ' + fc : '');
                            return self._generatePreviewTemplate(cat, dat, fn, ft, id, false, null, fc, ftr, ind, t);
                        };
                    if (!content) {
                        return '';
                    }
                    isDisabled = isDisabled === undefined ? true : isDisabled;
                    cat = $h.ifSet('type', config, self.initialPreviewFileType || 'generic');
                    fname = $h.ifSet('filename', config, $h.ifSet('caption', config));
                    ftype = $h.ifSet('filetype', config, cat);
                    ftr = self.previewCache.footer(i, isDisabled, (config && config.size || null));
                    frameClass = $h.ifSet('frameClass', config);
                    if (asData) {
                        out = parseTemplate(cat, content, fname, ftype, previewId, ftr, ind, frameClass);
                    } else {
                        out = parseTemplate('generic', content, fname, ftype, previewId, ftr, ind, frameClass, cat)
                            .setTokens({'content': data.content[i]});
                    }
                    if (data.tags.length && data.tags[i]) {
                        out = $h.replaceTags(out, data.tags[i]);
                    }
                    /** @namespace config.frameAttr */
                    if (!$h.isEmpty(config) && !$h.isEmpty(config.frameAttr)) {
                        $tmp = $(document.createElement('div')).html(out);
                        $tmp.find('.file-preview-initial').attr(config.frameAttr);
                        out = $tmp.html();
                        $tmp.remove();
                    }
                    return out;
                },
                add: function (content, config, tags, append) {
                    var data = self.previewCache.data, index;
                    if (!$h.isArray(content)) {
                        content = content.split(self.initialPreviewDelimiter);
                    }
                    if (append) {
                        index = data.content.push(content) - 1;
                        data.config[index] = config;
                        data.tags[index] = tags;
                    } else {
                        index = content.length - 1;
                        data.content = content;
                        data.config = config;
                        data.tags = tags;
                    }
                    self.previewCache.data = data;
                    return index;
                },
                set: function (content, config, tags, append) {
                    var data = self.previewCache.data, i, chk;
                    if (!content || !content.length) {
                        return;
                    }
                    if (!$h.isArray(content)) {
                        content = content.split(self.initialPreviewDelimiter);
                    }
                    chk = content.filter(function (n) {
                        return n !== null;
                    });
                    if (!chk.length) {
                        return;
                    }
                    if (data.content === undefined) {
                        data.content = [];
                    }
                    if (data.config === undefined) {
                        data.config = [];
                    }
                    if (data.tags === undefined) {
                        data.tags = [];
                    }
                    if (append) {
                        for (i = 0; i < content.length; i++) {
                            if (content[i]) {
                                data.content.push(content[i]);
                            }
                        }
                        for (i = 0; i < config.length; i++) {
                            if (config[i]) {
                                data.config.push(config[i]);
                            }
                        }
                        for (i = 0; i < tags.length; i++) {
                            if (tags[i]) {
                                data.tags.push(tags[i]);
                            }
                        }
                    } else {
                        data.content = content;
                        data.config = config;
                        data.tags = tags;
                    }
                    self.previewCache.data = data;
                },
                unset: function (index) {
                    var chk = self.previewCache.count();
                    if (!chk) {
                        return;
                    }
                    if (chk === 1) {
                        self.previewCache.data.content = [];
                        self.previewCache.data.config = [];
                        self.previewCache.data.tags = [];
                        self.initialPreview = [];
                        self.initialPreviewConfig = [];
                        self.initialPreviewThumbTags = [];
                        return;
                    }
                    self.previewCache.data.content.splice(index, 1);
                    self.previewCache.data.config.splice(index, 1);
                    self.previewCache.data.tags.splice(index, 1);
                },
                out: function () {
                    var html = '', caption, len = self.previewCache.count(), i;
                    if (len === 0) {
                        return {content: '', caption: ''};
                    }
                    for (i = 0; i < len; i++) {
                        html += self.previewCache.get(i);
                    }
                    caption = self._getMsgSelected(len);
                    return {content: html, caption: caption};
                },
                footer: function (i, isDisabled, size) {
                    var data = self.previewCache.data || {};
                    if ($h.isEmpty(data.content)) {
                        return '';
                    }
                    if ($h.isEmpty(data.config) || $h.isEmpty(data.config[i])) {
                        data.config[i] = {};
                    }
                    isDisabled = isDisabled === undefined ? true : isDisabled;
                    var config = data.config[i], caption = $h.ifSet('caption', config), a,
                        width = $h.ifSet('width', config, 'auto'), url = $h.ifSet('url', config, false),
                        key = $h.ifSet('key', config, null), fs = self.fileActionSettings,
                        initPreviewShowDel = self.initialPreviewShowDelete || false,
                        dUrl = config.downloadUrl || self.initialPreviewDownloadUrl || '',
                        dFil = config.filename || config.caption || '',
                        initPreviewShowDwl = !!(dUrl),
                        sDel = $h.ifSet('showDelete', config, $h.ifSet('showDelete', fs, initPreviewShowDel)),
                        sDwl = $h.ifSet('showDownload', config, $h.ifSet('showDownload', fs, initPreviewShowDwl)),
                        sZm = $h.ifSet('showZoom', config, $h.ifSet('showZoom', fs, true)),
                        sDrg = $h.ifSet('showDrag', config, $h.ifSet('showDrag', fs, true)),
                        dis = (url === false) && isDisabled;
                    sDwl = sDwl && config.downloadUrl !== false && !!dUrl;
                    a = self._renderFileActions(false, sDwl, sDel, sZm, sDrg, dis, url, key, true, dUrl, dFil);
                    return self._getLayoutTemplate('footer').setTokens({
                        'progress': self._renderThumbProgress(),
                        'actions': a,
                        'caption': caption,
                        'size': self._getSize(size),
                        'width': width,
                        'indicator': ''
                    });
                }
            };
            self.previewCache.init();
        },
        _handler: function ($el, event, callback) {
            var self = this, ns = self.namespace, ev = event.split(' ').join(ns + ' ') + ns;
            if (!$el || !$el.length) {
                return;
            }
            $el.off(ev).on(ev, callback);
        },
        _log: function (msg) {
            var self = this, id = self.$element.attr('id');
            if (id) {
                msg = '"' + id + '": ' + msg;
            }
            if (typeof window.console.log !== "undefined") {
                window.console.log(msg);
            } else {
                window.alert(msg);
            }
        },
        _validate: function () {
            var self = this, status = self.$element.attr('type') === 'file';
            if (!status) {
                self._log('The input "type" must be set to "file" for initializing the "bootstrap-fileinput" plugin.');
            }
            return status;
        },
        _errorsExist: function () {
            var self = this, $err, $errList = self.$errorContainer.find('li');
            if ($errList.length) {
                return true;
            }
            $err = $(document.createElement('div')).html(self.$errorContainer.html());
            $err.find('.kv-error-close').remove();
            $err.find('ul').remove();
            return !!$.trim($err.text()).length;
        },
        _errorHandler: function (evt, caption) {
            var self = this, err = evt.target.error, showError = function (msg) {
                self._showError(msg.replace('{name}', caption));
            };
            /** @namespace err.NOT_FOUND_ERR */
            /** @namespace err.SECURITY_ERR */
            /** @namespace err.NOT_READABLE_ERR */
            if (err.code === err.NOT_FOUND_ERR) {
                showError(self.msgFileNotFound);
            } else if (err.code === err.SECURITY_ERR) {
                showError(self.msgFileSecured);
            } else if (err.code === err.NOT_READABLE_ERR) {
                showError(self.msgFileNotReadable);
            } else if (err.code === err.ABORT_ERR) {
                showError(self.msgFilePreviewAborted);
            } else {
                showError(self.msgFilePreviewError);
            }
        },
        _addError: function (msg) {
            var self = this, $error = self.$errorContainer;
            if (msg && $error.length) {
                $error.html(self.errorCloseButton + msg);
                self._handler($error.find('.kv-error-close'), 'click', function () {
                    $error.fadeOut('slow');
                });
            }
        },
        _setValidationError: function (css) {
            var self = this;
            css = (css ? css + ' ' : '') + 'has-error';
            self.$container.removeClass(css).addClass('has-error');
            $h.addCss(self.$captionContainer, 'is-invalid');
        },
        _resetErrors: function (fade) {
            var self = this, $error = self.$errorContainer;
            self.isError = false;
            self.$container.removeClass('has-error');
            self.$captionContainer.removeClass('is-invalid');
            $error.html('');
            if (fade) {
                $error.fadeOut('slow');
            } else {
                $error.hide();
            }
        },
        _showFolderError: function (folders) {
            var self = this, $error = self.$errorContainer, msg;
            if (!folders) {
                return;
            }
            msg = self.msgFoldersNotAllowed.replace('{n}', folders);
            self._addError(msg);
            self._setValidationError();
            $error.fadeIn(800);
            self._raise('filefoldererror', [folders, msg]);
        },
        _showUploadError: function (msg, params, event) {
            var self = this, $error = self.$errorContainer, ev = event || 'fileuploaderror', e = params && params.id ?
                '<li data-file-id="' + params.id + '">' + msg + '</li>' : '<li>' + msg + '</li>';
            if ($error.find('ul').length === 0) {
                self._addError('<ul>' + e + '</ul>');
            } else {
                $error.find('ul').append(e);
            }
            $error.fadeIn(800);
            self._raise(ev, [params, msg]);
            self._setValidationError('file-input-new');
            return true;
        },
        _showError: function (msg, params, event) {
            var self = this, $error = self.$errorContainer, ev = event || 'fileerror';
            params = params || {};
            params.reader = self.reader;
            self._addError(msg);
            $error.fadeIn(800);
            self._raise(ev, [params, msg]);
            if (!self.isAjaxUpload) {
                self._clearFileInput();
            }
            self._setValidationError('file-input-new');
            self.$btnUpload.attr('disabled', true);
            return true;
        },
        _noFilesError: function (params) {
            var self = this, label = self.minFileCount > 1 ? self.filePlural : self.fileSingle,
                msg = self.msgFilesTooLess.replace('{n}', self.minFileCount).replace('{files}', label),
                $error = self.$errorContainer;
            self._addError(msg);
            self.isError = true;
            self._updateFileDetails(0);
            $error.fadeIn(800);
            self._raise('fileerror', [params, msg]);
            self._clearFileInput();
            self._setValidationError();
        },
        _parseError: function (operation, jqXHR, errorThrown, fileName) {
            /** @namespace jqXHR.responseJSON */
            var self = this, errMsg = $.trim(errorThrown + ''), textPre,
                text = jqXHR.responseJSON !== undefined && jqXHR.responseJSON.error !== undefined ?
                    jqXHR.responseJSON.error : jqXHR.responseText;
            if (self.cancelling && self.msgUploadAborted) {
                errMsg = self.msgUploadAborted;
            }
            if (self.showAjaxErrorDetails && text) {
                text = $.trim(text.replace(/\n\s*\n/g, '\n'));
                textPre = text.length ? '<pre>' + text + '</pre>' : '';
                errMsg += errMsg ? textPre : text;
            }
            if (!errMsg) {
                errMsg = self.msgAjaxError.replace('{operation}', operation);
            }
            self.cancelling = false;
            return fileName ? '<b>' + fileName + ': </b>' + errMsg : errMsg;
        },
        _parseFileType: function (type, name) {
            var self = this, isValid, vType, cat, i, types = self.allowedPreviewTypes || [];
            if (type === 'application/text-plain') {
                return 'text';
            }
            for (i = 0; i < types.length; i++) {
                cat = types[i];
                isValid = self.fileTypeSettings[cat];
                vType = isValid(type, name) ? cat : '';
                if (!$h.isEmpty(vType)) {
                    return vType;
                }
            }
            return 'other';
        },
        _getPreviewIcon: function (fname) {
            var self = this, ext, out = null;
            if (fname && fname.indexOf('.') > -1) {
                ext = fname.split('.').pop();
                if (self.previewFileIconSettings) {
                    out = self.previewFileIconSettings[ext] || self.previewFileIconSettings[ext.toLowerCase()] || null;
                }
                if (self.previewFileExtSettings) {
                    $.each(self.previewFileExtSettings, function (key, func) {
                        if (self.previewFileIconSettings[key] && func(ext)) {
                            out = self.previewFileIconSettings[key];
                            //noinspection UnnecessaryReturnStatementJS
                            return;
                        }
                    });
                }
            }
            return out;
        },
        _parseFilePreviewIcon: function (content, fname) {
            var self = this, icn = self._getPreviewIcon(fname) || self.previewFileIcon, out = content;
            if (out.indexOf('{previewFileIcon}') > -1) {
                out = out.setTokens({'previewFileIconClass': self.previewFileIconClass, 'previewFileIcon': icn});
            }
            return out;
        },
        _raise: function (event, params) {
            var self = this, e = $.Event(event);
            if (params !== undefined) {
                self.$element.trigger(e, params);
            } else {
                self.$element.trigger(e);
            }
            if (e.isDefaultPrevented() || e.result === false) {
                return false;
            }
            switch (event) {
                // ignore these events
                case 'filebatchuploadcomplete':
                case 'filebatchuploadsuccess':
                case 'fileuploaded':
                case 'fileclear':
                case 'filecleared':
                case 'filereset':
                case 'fileerror':
                case 'filefoldererror':
                case 'fileuploaderror':
                case 'filebatchuploaderror':
                case 'filedeleteerror':
                case 'filecustomerror':
                case 'filesuccessremove':
                    break;
                // receive data response via `filecustomerror` event`
                default:
                    if (!self.ajaxAborted) {
                        self.ajaxAborted = e.result;
                    }
                    break;
            }
            return true;
        },
        _listenFullScreen: function (isFullScreen) {
            var self = this, $modal = self.$modal, $btnFull, $btnBord;
            if (!$modal || !$modal.length) {
                return;
            }
            $btnFull = $modal && $modal.find('.btn-fullscreen');
            $btnBord = $modal && $modal.find('.btn-borderless');
            if (!$btnFull.length || !$btnBord.length) {
                return;
            }
            $btnFull.removeClass('active').attr('aria-pressed', 'false');
            $btnBord.removeClass('active').attr('aria-pressed', 'false');
            if (isFullScreen) {
                $btnFull.addClass('active').attr('aria-pressed', 'true');
            } else {
                $btnBord.addClass('active').attr('aria-pressed', 'true');
            }
            if ($modal.hasClass('file-zoom-fullscreen')) {
                self._maximizeZoomDialog();
            } else {
                if (isFullScreen) {
                    self._maximizeZoomDialog();
                } else {
                    $btnBord.removeClass('active').attr('aria-pressed', 'false');
                }
            }
        },
        _listen: function () {
            var self = this, $el = self.$element, $form = self.$form, $cont = self.$container, fullScreenEvents;
            self._handler($el, 'change', $.proxy(self._change, self));
            if (self.showBrowse) {
                self._handler(self.$btnFile, 'click', $.proxy(self._browse, self));
            }
            self._handler($cont.find('.fileinput-remove:not([disabled])'), 'click', $.proxy(self.clear, self));
            self._handler($cont.find('.fileinput-cancel'), 'click', $.proxy(self.cancel, self));
            self._initDragDrop();
            self._handler($form, 'reset', $.proxy(self.clear, self));
            if (!self.isAjaxUpload) {
                self._handler($form, 'submit', $.proxy(self._submitForm, self));
            }
            self._handler(self.$container.find('.fileinput-upload'), 'click', $.proxy(self._uploadClick, self));
            self._handler($(window), 'resize', function () {
                self._listenFullScreen(screen.width === window.innerWidth && screen.height === window.innerHeight);
            });
            fullScreenEvents = 'webkitfullscreenchange mozfullscreenchange fullscreenchange MSFullscreenChange';
            self._handler($(document), fullScreenEvents, function () {
                self._listenFullScreen($h.checkFullScreen());
            });
            self._autoFitContent();
            self._initClickable();
        },
        _autoFitContent: function () {
            var width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
                self = this, config = width < 400 ? (self.previewSettingsSmall || self.defaults.previewSettingsSmall) :
                    (self.previewSettings || self.defaults.previewSettings), sel;
            $.each(config, function (cat, settings) {
                sel = '.file-preview-frame .file-preview-' + cat;
                self.$preview.find(sel + '.kv-preview-data,' + sel + ' .kv-preview-data').css(settings);
            });
        },
        _initClickable: function () {
            var self = this, $zone;
            if (!self.isClickable) {
                return;
            }
            $zone = self.isAjaxUpload ? self.$dropZone : self.$preview.find('.file-default-preview');
            $h.addCss($zone, 'clickable');
            $zone.attr('tabindex', -1);
            self._handler($zone, 'click', function (e) {
                var $tar = $(e.target);
                if (!$tar.parents('.file-preview-thumbnails').length || $tar.parents('.file-default-preview').length) {
                    self.$element.trigger('click');
                    $zone.blur();
                }
            });
        },
        _initDragDrop: function () {
            var self = this, $zone = self.$dropZone;
            if (self.isAjaxUpload && self.dropZoneEnabled && self.showPreview) {
                self._handler($zone, 'dragenter dragover', $.proxy(self._zoneDragEnter, self));
                self._handler($zone, 'dragleave', $.proxy(self._zoneDragLeave, self));
                self._handler($zone, 'drop', $.proxy(self._zoneDrop, self));
                self._handler($(document), 'dragenter dragover drop', self._zoneDragDropInit);
            }
        },
        _zoneDragDropInit: function (e) {
            e.stopPropagation();
            e.preventDefault();
        },
        _zoneDragEnter: function (e) {
            var self = this, hasFiles = $.inArray('Files', e.originalEvent.dataTransfer.types) > -1;
            self._zoneDragDropInit(e);
            if (self.isDisabled || !hasFiles) {
                e.originalEvent.dataTransfer.effectAllowed = 'none';
                e.originalEvent.dataTransfer.dropEffect = 'none';
                return;
            }
            $h.addCss(self.$dropZone, 'file-highlighted');
        },
        _zoneDragLeave: function (e) {
            var self = this;
            self._zoneDragDropInit(e);
            if (self.isDisabled) {
                return;
            }
            self.$dropZone.removeClass('file-highlighted');
        },
        _zoneDrop: function (e) {
            var self = this;
            e.preventDefault();
            /** @namespace e.originalEvent.dataTransfer */
            if (self.isDisabled || $h.isEmpty(e.originalEvent.dataTransfer.files)) {
                return;
            }
            self._change(e, 'dragdrop');
            self.$dropZone.removeClass('file-highlighted');
        },
        _uploadClick: function (e) {
            var self = this, $btn = self.$container.find('.fileinput-upload'), $form,
                isEnabled = !$btn.hasClass('disabled') && $h.isEmpty($btn.attr('disabled'));
            if (e && e.isDefaultPrevented()) {
                return;
            }
            if (!self.isAjaxUpload) {
                if (isEnabled && $btn.attr('type') !== 'submit') {
                    $form = $btn.closest('form');
                    // downgrade to normal form submit if possible
                    if ($form.length) {
                        $form.trigger('submit');
                    }
                    e.preventDefault();
                }
                return;
            }
            e.preventDefault();
            if (isEnabled) {
                self.upload();
            }
        },
        _submitForm: function () {
            var self = this;
            return self._isFileSelectionValid() && !self._abort({});
        },
        _clearPreview: function () {
            var self = this, $p = self.$preview,
                $thumbs = self.showUploadedThumbs ? self.getFrames(':not(.file-preview-success)') : self.getFrames();
            $thumbs.each(function () {
                var $thumb = $(this);
                $thumb.remove();
                $h.cleanZoomCache($p.find('#zoom-' + $thumb.attr('id')));
            });
            if (!self.getFrames().length || !self.showPreview) {
                self._resetUpload();
            }
            self._validateDefaultPreview();
        },
        _initSortable: function () {
            var self = this, $el = self.$preview, settings, selector = '.' + $h.SORT_CSS;
            if (!window.KvSortable || $el.find(selector).length === 0) {
                return;
            }
            //noinspection JSUnusedGlobalSymbols
            settings = {
                handle: '.drag-handle-init',
                dataIdAttr: 'data-preview-id',
                scroll: false,
                draggable: selector,
                onSort: function (e) {
                    var oldIndex = e.oldIndex, newIndex = e.newIndex, key, $frame;
                    self.initialPreview = $h.moveArray(self.initialPreview, oldIndex, newIndex);
                    self.initialPreviewConfig = $h.moveArray(self.initialPreviewConfig, oldIndex, newIndex);
                    self.previewCache.init();
                    for (var i = 0; i < self.initialPreviewConfig.length; i++) {
                        if (self.initialPreviewConfig[i] !== null) {
                            key = self.initialPreviewConfig[i].key;
                            $frame = $(".kv-file-remove[data-key='" + key + "']").closest($h.FRAMES);
                            $frame.attr('data-fileindex', 'init_' + i).attr('data-fileindex', 'init_' + i);
                        }
                    }
                    self._raise('filesorted', {
                        previewId: $(e.item).attr('id'),
                        'oldIndex': oldIndex,
                        'newIndex': newIndex,
                        stack: self.initialPreviewConfig
                    });
                }
            };
            if ($el.data('kvsortable')) {
                $el.kvsortable('destroy');
            }
            $.extend(true, settings, self.fileActionSettings.dragSettings);
            $el.kvsortable(settings);
        },
        _setPreviewContent: function (content) {
            var self = this;
            self.$preview.html(content);
            self._autoFitContent();
        },
        _initPreview: function (isInit) {
            var self = this, cap = self.initialCaption || '', out;
            if (!self.previewCache.count()) {
                self._clearPreview();
                if (isInit) {
                    self._setCaption(cap);
                } else {
                    self._initCaption();
                }
                return;
            }
            out = self.previewCache.out();
            cap = isInit && self.initialCaption ? self.initialCaption : out.caption;
            self._setPreviewContent(out.content);
            self._setInitThumbAttr();
            self._setCaption(cap);
            self._initSortable();
            if (!$h.isEmpty(out.content)) {
                self.$container.removeClass('file-input-new');
            }
        },
        _getZoomButton: function (type) {
            var self = this, label = self.previewZoomButtonIcons[type], css = self.previewZoomButtonClasses[type],
                title = ' title="' + (self.previewZoomButtonTitles[type] || '') + '" ',
                params = title + (type === 'close' ? ' data-dismiss="modal" aria-hidden="true"' : '');
            if (type === 'fullscreen' || type === 'borderless' || type === 'toggleheader') {
                params += ' data-toggle="button" aria-pressed="false" autocomplete="off"';
            }
            return '<button type="button" class="' + css + ' btn-' + type + '"' + params + '>' + label + '</button>';
        },
        _getModalContent: function () {
            var self = this;
            return self._getLayoutTemplate('modal').setTokens({
                'rtl': self.rtl ? ' kv-rtl' : '',
                'zoomFrameClass': self.frameClass,
                'heading': self.msgZoomModalHeading,
                'prev': self._getZoomButton('prev'),
                'next': self._getZoomButton('next'),
                'toggleheader': self._getZoomButton('toggleheader'),
                'fullscreen': self._getZoomButton('fullscreen'),
                'borderless': self._getZoomButton('borderless'),
                'close': self._getZoomButton('close')
            });
        },
        _listenModalEvent: function (event) {
            var self = this, $modal = self.$modal, getParams = function (e) {
                return {
                    sourceEvent: e,
                    previewId: $modal.data('previewId'),
                    modal: $modal
                };
            };
            $modal.on(event + '.bs.modal', function (e) {
                var $btnFull = $modal.find('.btn-fullscreen'), $btnBord = $modal.find('.btn-borderless');
                self._raise('filezoom' + event, getParams(e));
                if (event === 'shown') {
                    $btnBord.removeClass('active').attr('aria-pressed', 'false');
                    $btnFull.removeClass('active').attr('aria-pressed', 'false');
                    if ($modal.hasClass('file-zoom-fullscreen')) {
                        self._maximizeZoomDialog();
                        if ($h.checkFullScreen()) {
                            $btnFull.addClass('active').attr('aria-pressed', 'true');
                        } else {
                            $btnBord.addClass('active').attr('aria-pressed', 'true');
                        }
                    }
                }
            });
        },
        _initZoom: function () {
            var self = this, $dialog, modalMain = self._getLayoutTemplate('modalMain'), modalId = '#' + $h.MODAL_ID;
            if (!self.showPreview) {
                return;
            }
            self.$modal = $(modalId);
            if (!self.$modal || !self.$modal.length) {
                $dialog = $(document.createElement('div')).html(modalMain).insertAfter(self.$container);
                self.$modal = $(modalId).insertBefore($dialog);
                $dialog.remove();
            }
            $h.initModal(self.$modal);
            self.$modal.html(self._getModalContent());
            $.each($h.MODAL_EVENTS, function (key, event) {
                self._listenModalEvent(event);
            });
        },
        _initZoomButtons: function () {
            var self = this, previewId = self.$modal.data('previewId') || '', $first, $last,
                thumbs = self.getFrames().toArray(), len = thumbs.length, $prev = self.$modal.find('.btn-prev'),
                $next = self.$modal.find('.btn-next');
            if (thumbs.length < 2) {
                $prev.hide();
                $next.hide();
                return;
            } else {
                $prev.show();
                $next.show();
            }
            if (!len) {
                return;
            }
            $first = $(thumbs[0]);
            $last = $(thumbs[len - 1]);
            $prev.removeAttr('disabled');
            $next.removeAttr('disabled');
            if ($first.length && $first.attr('id') === previewId) {
                $prev.attr('disabled', true);
            }
            if ($last.length && $last.attr('id') === previewId) {
                $next.attr('disabled', true);
            }
        },
        _maximizeZoomDialog: function () {
            var self = this, $modal = self.$modal, $head = $modal.find('.modal-header:visible'),
                $foot = $modal.find('.modal-footer:visible'), $body = $modal.find('.modal-body'),
                h = $(window).height(), diff = 0;
            $modal.addClass('file-zoom-fullscreen');
            if ($head && $head.length) {
                h -= $head.outerHeight(true);
            }
            if ($foot && $foot.length) {
                h -= $foot.outerHeight(true);
            }
            if ($body && $body.length) {
                diff = $body.outerHeight(true) - $body.height();
                h -= diff;
            }
            $modal.find('.kv-zoom-body').height(h);
        },
        _resizeZoomDialog: function (fullScreen) {
            var self = this, $modal = self.$modal, $btnFull = $modal.find('.btn-fullscreen'),
                $btnBord = $modal.find('.btn-borderless');
            if ($modal.hasClass('file-zoom-fullscreen')) {
                $h.toggleFullScreen(false);
                if (!fullScreen) {
                    if (!$btnFull.hasClass('active')) {
                        $modal.removeClass('file-zoom-fullscreen');
                        self.$modal.find('.kv-zoom-body').css('height', self.zoomModalHeight);
                    } else {
                        $btnFull.removeClass('active').attr('aria-pressed', 'false');
                    }
                } else {
                    if (!$btnFull.hasClass('active')) {
                        $modal.removeClass('file-zoom-fullscreen');
                        self._resizeZoomDialog(true);
                        if ($btnBord.hasClass('active')) {
                            $btnBord.removeClass('active').attr('aria-pressed', 'false');
                        }
                    }
                }
            } else {
                if (!fullScreen) {
                    self._maximizeZoomDialog();
                    return;
                }
                $h.toggleFullScreen(true);
            }
            $modal.focus();
        },
        _setZoomContent: function ($frame, animate) {
            var self = this, $content, tmplt, body, title, $body, $dataEl, config, pid = $frame.attr('id'),
                $modal = self.$modal, $prev = $modal.find('.btn-prev'), $next = $modal.find('.btn-next'), $tmp,
                $btnFull = $modal.find('.btn-fullscreen'), $btnBord = $modal.find('.btn-borderless'), cap, size,
                $btnTogh = $modal.find('.btn-toggleheader'), $zoomPreview = self.$preview.find('#zoom-' + pid);
            tmplt = $zoomPreview.attr('data-template') || 'generic';
            $content = $zoomPreview.find('.kv-file-content');
            body = $content.length ? $content.html() : '';
            cap = $frame.data('caption') || '';
            size = $frame.data('size') || '';
            title = cap + ' ' + size;
            $modal.find('.kv-zoom-title').attr('title', $('<div/>').html(title).text()).html(title);
            $body = $modal.find('.kv-zoom-body');
            $modal.removeClass('kv-single-content');
            if (animate) {
                $tmp = $body.addClass('file-thumb-loading').clone().insertAfter($body);
                $body.html(body).hide();
                $tmp.fadeOut('fast', function () {
                    $body.fadeIn('fast', function () {
                        $body.removeClass('file-thumb-loading');
                    });
                    $tmp.remove();
                });
            } else {
                $body.html(body);
            }
            config = self.previewZoomSettings[tmplt];
            if (config) {
                $dataEl = $body.find('.kv-preview-data');
                $h.addCss($dataEl, 'file-zoom-detail');
                $.each(config, function (key, value) {
                    $dataEl.css(key, value);
                    if (($dataEl.attr('width') && key === 'width') || ($dataEl.attr('height') && key === 'height')) {
                        $dataEl.removeAttr(key);
                    }
                });
            }
            $modal.data('previewId', pid);
            var $img = $body.find('img');
            if ($img.length) {
                $h.adjustOrientedImage($img, true);
            }
            self._handler($prev, 'click', function () {
                self._zoomSlideShow('prev', pid);
            });
            self._handler($next, 'click', function () {
                self._zoomSlideShow('next', pid);
            });
            self._handler($btnFull, 'click', function () {
                self._resizeZoomDialog(true);
            });
            self._handler($btnBord, 'click', function () {
                self._resizeZoomDialog(false);
            });
            self._handler($btnTogh, 'click', function () {
                var $header = $modal.find('.modal-header'), $floatBar = $modal.find('.modal-body .floating-buttons'),
                    ht, $actions = $header.find('.kv-zoom-actions'), resize = function (height) {
                        var $body = self.$modal.find('.kv-zoom-body'), h = self.zoomModalHeight;
                        if ($modal.hasClass('file-zoom-fullscreen')) {
                            h = $body.outerHeight(true);
                            if (!height) {
                                h = h - $header.outerHeight(true);
                            }
                        }
                        $body.css('height', height ? h + height : h);
                    };
                if ($header.is(':visible')) {
                    ht = $header.outerHeight(true);
                    $header.slideUp('slow', function () {
                        $actions.find('.btn').appendTo($floatBar);
                        resize(ht);
                    });
                } else {
                    $floatBar.find('.btn').appendTo($actions);
                    $header.slideDown('slow', function () {
                        resize();
                    });
                }
                $modal.focus();
            });
            self._handler($modal, 'keydown', function (e) {
                var key = e.which || e.keyCode;
                if (key === 37 && !$prev.attr('disabled')) {
                    self._zoomSlideShow('prev', pid);
                }
                if (key === 39 && !$next.attr('disabled')) {
                    self._zoomSlideShow('next', pid);
                }
            });
        },
        _zoomPreview: function ($btn) {
            var self = this, $frame, $modal = self.$modal;
            if (!$btn.length) {
                throw 'Cannot zoom to detailed preview!';
            }
            $h.initModal($modal);
            $modal.html(self._getModalContent());
            $frame = $btn.closest($h.FRAMES);
            self._setZoomContent($frame);
            $modal.modal('show');
            self._initZoomButtons();
        },
        _zoomSlideShow: function (dir, previewId) {
            var self = this, $btn = self.$modal.find('.kv-zoom-actions .btn-' + dir), $targFrame, i,
                thumbs = self.getFrames().toArray(), len = thumbs.length, out;
            if ($btn.attr('disabled')) {
                return;
            }
            for (i = 0; i < len; i++) {
                if ($(thumbs[i]).attr('id') === previewId) {
                    out = dir === 'prev' ? i - 1 : i + 1;
                    break;
                }
            }
            if (out < 0 || out >= len || !thumbs[out]) {
                return;
            }
            $targFrame = $(thumbs[out]);
            if ($targFrame.length) {
                self._setZoomContent($targFrame, true);
            }
            self._initZoomButtons();
            self._raise('filezoom' + dir, {'previewId': previewId, modal: self.$modal});
        },
        _initZoomButton: function () {
            var self = this;
            self.$preview.find('.kv-file-zoom').each(function () {
                var $el = $(this);
                self._handler($el, 'click', function () {
                    self._zoomPreview($el);
                });
            });
        },
        _clearObjects: function ($el) {
            $el.find('video audio').each(function () {
                this.pause();
                $(this).remove();
            });
            $el.find('img object div').each(function () {
                $(this).remove();
            });
        },
        _clearFileInput: function () {
            var self = this, $el = self.$element, $srcFrm, $tmpFrm, $tmpEl;
            self.fileInputCleared = true;
            if ($h.isEmpty($el.val())) {
                return;
            }
            // Fix for IE ver < 11, that does not clear file inputs. Requires a sequence of steps to prevent IE
            // crashing but still allow clearing of the file input.
            if (self.isIE9 || self.isIE10) {
                $srcFrm = $el.closest('form');
                $tmpFrm = $(document.createElement('form'));
                $tmpEl = $(document.createElement('div'));
                $el.before($tmpEl);
                if ($srcFrm.length) {
                    $srcFrm.after($tmpFrm);
                } else {
                    $tmpEl.after($tmpFrm);
                }
                $tmpFrm.append($el).trigger('reset');
                $tmpEl.before($el).remove();
                $tmpFrm.remove();
            } else { // normal input clear behavior for other sane browsers
                $el.val('');
            }
        },
        _resetUpload: function () {
            var self = this;
            self.uploadCache = {content: [], config: [], tags: [], append: true};
            self.uploadCount = 0;
            self.uploadStatus = {};
            self.uploadLog = [];
            self.uploadAsyncCount = 0;
            self.loadedImages = [];
            self.totalImagesCount = 0;
            self.$btnUpload.removeAttr('disabled');
            self._setProgress(0);
            self.$progress.hide();
            self._resetErrors(false);
            self.ajaxAborted = false;
            self.ajaxRequests = [];
            self._resetCanvas();
            self.cacheInitialPreview = {};
            if (self.overwriteInitial) {
                self.initialPreview = [];
                self.initialPreviewConfig = [];
                self.initialPreviewThumbTags = [];
                self.previewCache.data = {
                    content: [],
                    config: [],
                    tags: []
                };
            }
        },
        _resetCanvas: function () {
            var self = this;
            if (self.canvas && self.imageCanvasContext) {
                self.imageCanvasContext.clearRect(0, 0, self.canvas.width, self.canvas.height);
            }
        },
        _hasInitialPreview: function () {
            var self = this;
            return !self.overwriteInitial && self.previewCache.count();
        },
        _resetPreview: function () {
            var self = this, out, cap;
            if (self.previewCache.count()) {
                out = self.previewCache.out();
                self._setPreviewContent(out.content);
                self._setInitThumbAttr();
                cap = self.initialCaption ? self.initialCaption : out.caption;
                self._setCaption(cap);
            } else {
                self._clearPreview();
                self._initCaption();
            }
            if (self.showPreview) {
                self._initZoom();
                self._initSortable();
            }
        },
        _clearDefaultPreview: function () {
            var self = this;
            self.$preview.find('.file-default-preview').remove();
        },
        _validateDefaultPreview: function () {
            var self = this;
            if (!self.showPreview || $h.isEmpty(self.defaultPreviewContent)) {
                return;
            }
            self._setPreviewContent('<div class="file-default-preview">' + self.defaultPreviewContent + '</div>');
            self.$container.removeClass('file-input-new');
            self._initClickable();
        },
        _resetPreviewThumbs: function (isAjax) {
            var self = this, out;
            if (isAjax) {
                self._clearPreview();
                self.clearStack();
                return;
            }
            if (self._hasInitialPreview()) {
                out = self.previewCache.out();
                self._setPreviewContent(out.content);
                self._setInitThumbAttr();
                self._setCaption(out.caption);
                self._initPreviewActions();
            } else {
                self._clearPreview();
            }
        },
        _getLayoutTemplate: function (t) {
            var self = this, template = self.layoutTemplates[t];
            if ($h.isEmpty(self.customLayoutTags)) {
                return template;
            }
            return $h.replaceTags(template, self.customLayoutTags);
        },
        _getPreviewTemplate: function (t) {
            var self = this, template = self.previewTemplates[t];
            if ($h.isEmpty(self.customPreviewTags)) {
                return template;
            }
            return $h.replaceTags(template, self.customPreviewTags);
        },
        _getOutData: function (jqXHR, responseData, filesData) {
            var self = this;
            jqXHR = jqXHR || {};
            responseData = responseData || {};
            filesData = filesData || self.filestack.slice(0) || {};
            return {
                form: self.formdata,
                files: filesData,
                filenames: self.filenames,
                filescount: self.getFilesCount(),
                extra: self._getExtraData(),
                response: responseData,
                reader: self.reader,
                jqXHR: jqXHR
            };
        },
        _getMsgSelected: function (n) {
            var self = this, strFiles = n === 1 ? self.fileSingle : self.filePlural;
            return n > 0 ? self.msgSelected.replace('{n}', n).replace('{files}', strFiles) : self.msgNoFilesSelected;
        },
        _getFrame: function (id) {
            var self = this, $frame = $('#' + id);
            if (!$frame.length) {
                self._log('Invalid thumb frame with id: "' + id + '".');
                return null;
            }
            return $frame;
        },
        _getThumbs: function (css) {
            css = css || '';
            return this.getFrames(':not(.file-preview-initial)' + css);
        },
        _getExtraData: function (previewId, index) {
            var self = this, data = self.uploadExtraData;
            if (typeof self.uploadExtraData === "function") {
                data = self.uploadExtraData(previewId, index);
            }
            return data;
        },
        _initXhr: function (xhrobj, previewId, fileCount) {
            var self = this;
            if (xhrobj.upload) {
                xhrobj.upload.addEventListener('progress', function (event) {
                    var pct = 0, total = event.total, position = event.loaded || event.position;
                    /** @namespace event.lengthComputable */
                    if (event.lengthComputable) {
                        pct = Math.floor(position / total * 100);
                    }
                    if (previewId) {
                        self._setAsyncUploadStatus(previewId, pct, fileCount);
                    } else {
                        self._setProgress(pct);
                    }
                }, false);
            }
            return xhrobj;
        },
        _mergeAjaxCallback: function (funcName, srcFunc, type) {
            var self = this, settings = self.ajaxSettings, flag = self.mergeAjaxCallbacks, targFunc;
            if (type === 'delete') {
                settings = self.ajaxDeleteSettings;
                flag = self.mergeAjaxDeleteCallbacks;
            }
            targFunc = settings[funcName];
            if (flag && typeof targFunc === "function") {
                if (flag === 'before') {
                    settings[funcName] = function () {
                        targFunc.apply(this, arguments);
                        srcFunc.apply(this, arguments);
                    };
                } else {
                    settings[funcName] = function () {
                        srcFunc.apply(this, arguments);
                        targFunc.apply(this, arguments);
                    };
                }
            } else {
                settings[funcName] = srcFunc;
            }
            if (type === 'delete') {
                self.ajaxDeleteSettings = settings;
            } else {
                self.ajaxSettings = settings;
            }
        },
        _ajaxSubmit: function (fnBefore, fnSuccess, fnComplete, fnError, previewId, index) {
            var self = this, settings;
            if (!self._raise('filepreajax', [previewId, index])) {
                return;
            }
            self._uploadExtra(previewId, index);
            self._mergeAjaxCallback('beforeSend', fnBefore);
            self._mergeAjaxCallback('success', fnSuccess);
            self._mergeAjaxCallback('complete', fnComplete);
            self._mergeAjaxCallback('error', fnError);
            settings = $.extend(true, {}, {
                xhr: function () {
                    var xhrobj = $.ajaxSettings.xhr();
                    return self._initXhr(xhrobj, previewId, self.getFileStack().length);
                },
                url: index && self.uploadUrlThumb ? self.uploadUrlThumb : self.uploadUrl,
                type: 'POST',
                dataType: 'json',
                data: self.formdata,
                cache: false,
                processData: false,
                contentType: false
            }, self.ajaxSettings);
            self.ajaxRequests.push($.ajax(settings));
        },
        _mergeArray: function (prop, content) {
            var self = this, arr1 = $h.cleanArray(self[prop]), arr2 = $h.cleanArray(content);
            self[prop] = arr1.concat(arr2);
        },
        _initUploadSuccess: function (out, $thumb, allFiles) {
            var self = this, append, data, index, $div, $newCache, content, config, tags, i;
            if (!self.showPreview || typeof out !== 'object' || $.isEmptyObject(out)) {
                return;
            }
            if (out.initialPreview !== undefined && out.initialPreview.length > 0) {
                self.hasInitData = true;
                content = out.initialPreview || [];
                config = out.initialPreviewConfig || [];
                tags = out.initialPreviewThumbTags || [];
                append = out.append === undefined || out.append;
                if (content.length > 0 && !$h.isArray(content)) {
                    content = content.split(self.initialPreviewDelimiter);
                }
                self._mergeArray('initialPreview', content);
                self._mergeArray('initialPreviewConfig', config);
                self._mergeArray('initialPreviewThumbTags', tags);
                if ($thumb !== undefined) {
                    if (!allFiles) {
                        index = self.previewCache.add(content, config[0], tags[0], append);
                        data = self.previewCache.get(index, false);
                        $div = $(document.createElement('div')).html(data).hide().insertAfter($thumb);
                        $newCache = $div.find('.kv-zoom-cache');
                        if ($newCache && $newCache.length) {
                            $newCache.insertAfter($thumb);
                        }
                        $thumb.fadeOut('slow', function () {
                            var $newThumb = $div.find('.file-preview-frame');
                            if ($newThumb && $newThumb.length) {
                                $newThumb.insertBefore($thumb).fadeIn('slow').css('display:inline-block');
                            }
                            self._initPreviewActions();
                            self._clearFileInput();
                            $h.cleanZoomCache(self.$preview.find('#zoom-' + $thumb.attr('id')));
                            $thumb.remove();
                            $div.remove();
                            self._initSortable();
                        });
                    } else {
                        i = $thumb.attr('data-fileindex');
                        self.uploadCache.content[i] = content[0];
                        self.uploadCache.config[i] = config[0] || [];
                        self.uploadCache.tags[i] = tags[0] || [];
                        self.uploadCache.append = append;
                    }
                } else {
                    self.previewCache.set(content, config, tags, append);
                    self._initPreview();
                    self._initPreviewActions();
                }
            }
        },
        _initSuccessThumbs: function () {
            var self = this;
            if (!self.showPreview) {
                return;
            }
            self._getThumbs($h.FRAMES + '.file-preview-success').each(function () {
                var $thumb = $(this), $preview = self.$preview, $remove = $thumb.find('.kv-file-remove');
                $remove.removeAttr('disabled');
                self._handler($remove, 'click', function () {
                    var id = $thumb.attr('id'),
                        out = self._raise('filesuccessremove', [id, $thumb.attr('data-fileindex')]);
                    $h.cleanMemory($thumb);
                    if (out === false) {
                        return;
                    }
                    $thumb.fadeOut('slow', function () {
                        $h.cleanZoomCache($preview.find('#zoom-' + id));
                        $thumb.remove();
                        if (!self.getFrames().length) {
                            self.reset();
                        }
                    });
                });
            });
        },
        _checkAsyncComplete: function () {
            var self = this, previewId, i;
            for (i = 0; i < self.filestack.length; i++) {
                if (self.filestack[i]) {
                    previewId = self.previewInitId + "-" + i;
                    if ($.inArray(previewId, self.uploadLog) === -1) {
                        return false;
                    }
                }
            }
            return (self.uploadAsyncCount === self.uploadLog.length);
        },
        _uploadExtra: function (previewId, index) {
            var self = this, data = self._getExtraData(previewId, index);
            if (data.length === 0) {
                return;
            }
            $.each(data, function (key, value) {
                self.formdata.append(key, value);
            });
        },
        _uploadSingle: function (i, allFiles) {
            var self = this, total = self.getFileStack().length, formdata = new FormData(), outData,
                previewId = self.previewInitId + "-" + i, $thumb, chkComplete, $btnUpload, $btnDelete,
                hasPostData = self.filestack.length > 0 || !$.isEmptyObject(self.uploadExtraData), uploadFailed,
                $prog = $('#' + previewId).find('.file-thumb-progress'), fnBefore, fnSuccess, fnComplete, fnError,
                updateUploadLog, params = {id: previewId, index: i};
            self.formdata = formdata;
            if (self.showPreview) {
                $thumb = $('#' + previewId + ':not(.file-preview-initial)');
                $btnUpload = $thumb.find('.kv-file-upload');
                $btnDelete = $thumb.find('.kv-file-remove');
                $prog.show();
            }
            if (total === 0 || !hasPostData || ($btnUpload && $btnUpload.hasClass('disabled')) || self._abort(params)) {
                return;
            }
            updateUploadLog = function (i, previewId) {
                if (!uploadFailed) {
                    self.updateStack(i, undefined);
                }
                self.uploadLog.push(previewId);
                if (self._checkAsyncComplete()) {
                    self.fileBatchCompleted = true;
                }
            };
            chkComplete = function () {
                var u = self.uploadCache, $initThumbs, i, j, len = 0, data = self.cacheInitialPreview;
                if (!self.fileBatchCompleted) {
                    return;
                }
                if (data && data.content) {
                    len = data.content.length;
                }
                setTimeout(function () {
                    var triggerReset = self.getFileStack(true).length === 0;
                    if (self.showPreview) {
                        self.previewCache.set(u.content, u.config, u.tags, u.append);
                        if (len) {
                            for (i = 0; i < u.content.length; i++) {
                                j = i + len;
                                data.content[j] = u.content[i];
                                //noinspection JSUnresolvedVariable
                                if (data.config.length) {
                                    data.config[j] = u.config[i];
                                }
                                if (data.tags.length) {
                                    data.tags[j] = u.tags[i];
                                }
                            }
                            self.initialPreview = $h.cleanArray(data.content);
                            self.initialPreviewConfig = $h.cleanArray(data.config);
                            self.initialPreviewThumbTags = $h.cleanArray(data.tags);
                        } else {
                            self.initialPreview = u.content;
                            self.initialPreviewConfig = u.config;
                            self.initialPreviewThumbTags = u.tags;
                        }
                        self.cacheInitialPreview = {};
                        if (self.hasInitData) {
                            self._initPreview();
                            self._initPreviewActions();
                        }
                    }
                    self.unlock(triggerReset);
                    if (triggerReset) {
                        self._clearFileInput();
                    }
                    $initThumbs = self.$preview.find('.file-preview-initial');
                    if (self.uploadAsync && $initThumbs.length) {
                        $h.addCss($initThumbs, $h.SORT_CSS);
                        self._initSortable();
                    }
                    self._raise('filebatchuploadcomplete', [self.filestack, self._getExtraData()]);
                    self.uploadCount = 0;
                    self.uploadStatus = {};
                    self.uploadLog = [];
                    self._setProgress(101);
                }, 100);
            };
            fnBefore = function (jqXHR) {
                outData = self._getOutData(jqXHR);
                self.fileBatchCompleted = false;
                if (self.showPreview) {
                    if (!$thumb.hasClass('file-preview-success')) {
                        self._setThumbStatus($thumb, 'Loading');
                        $h.addCss($thumb, 'file-uploading');
                    }
                    $btnUpload.attr('disabled', true);
                    $btnDelete.attr('disabled', true);
                }
                if (!allFiles) {
                    self.lock();
                }
                self._raise('filepreupload', [outData, previewId, i]);
                $.extend(true, params, outData);
                if (self._abort(params)) {
                    jqXHR.abort();
                    self._setProgressCancelled();
                }
            };
            fnSuccess = function (data, textStatus, jqXHR) {
                var pid = self.showPreview && $thumb.attr('id') ? $thumb.attr('id') : previewId;
                outData = self._getOutData(jqXHR, data);
                $.extend(true, params, outData);
                setTimeout(function () {
                    if ($h.isEmpty(data) || $h.isEmpty(data.error)) {
                        if (self.showPreview) {
                            self._setThumbStatus($thumb, 'Success');
                            $btnUpload.hide();
                            self._initUploadSuccess(data, $thumb, allFiles);
                            self._setProgress(101, $prog);
                        }
                        self._raise('fileuploaded', [outData, pid, i]);
                        if (!allFiles) {
                            self.updateStack(i, undefined);
                        } else {
                            updateUploadLog(i, pid);
                        }
                    } else {
                        uploadFailed = true;
                        self._showUploadError(data.error, params);
                        self._setPreviewError($thumb, i, self.filestack[i], self.retryErrorUploads);
                        if (!self.retryErrorUploads) {
                            $btnUpload.hide();
                        }
                        if (allFiles) {
                            updateUploadLog(i, pid);
                        }
                        self._setProgress(101, $('#' + pid).find('.file-thumb-progress'), self.msgUploadError);
                    }
                }, 100);
            };
            fnComplete = function () {
                setTimeout(function () {
                    if (self.showPreview) {
                        $btnUpload.removeAttr('disabled');
                        $btnDelete.removeAttr('disabled');
                        $thumb.removeClass('file-uploading');
                    }
                    if (!allFiles) {
                        self.unlock(false);
                        self._clearFileInput();
                    } else {
                        chkComplete();
                    }
                    self._initSuccessThumbs();
                }, 100);
            };
            fnError = function (jqXHR, textStatus, errorThrown) {
                var op = self.ajaxOperations.uploadThumb,
                    errMsg = self._parseError(op, jqXHR, errorThrown, (allFiles && self.filestack[i].name ? self.filestack[i].name : null));
                uploadFailed = true;
                setTimeout(function () {
                    if (allFiles) {
                        updateUploadLog(i, previewId);
                    }
                    self.uploadStatus[previewId] = 100;
                    self._setPreviewError($thumb, i, self.filestack[i], self.retryErrorUploads);
                    if (!self.retryErrorUploads) {
                        $btnUpload.hide();
                    }
                    $.extend(true, params, self._getOutData(jqXHR));
                    self._setProgress(101, $prog, self.msgAjaxProgressError.replace('{operation}', op));
                    self._setProgress(101, $('#' + previewId).find('.file-thumb-progress'), self.msgUploadError);
                    self._showUploadError(errMsg, params);
                }, 100);
            };
            formdata.append(self.uploadFileAttr, self.filestack[i], self.filenames[i]);
            formdata.append('file_id', i);
            self._ajaxSubmit(fnBefore, fnSuccess, fnComplete, fnError, previewId, i);
        },
        _uploadBatch: function () {
            var self = this, files = self.filestack, total = files.length, params = {}, fnBefore, fnSuccess, fnError,
                fnComplete, hasPostData = self.filestack.length > 0 || !$.isEmptyObject(self.uploadExtraData),
                setAllUploaded;
            self.formdata = new FormData();
            if (total === 0 || !hasPostData || self._abort(params)) {
                return;
            }
            setAllUploaded = function () {
                $.each(files, function (key) {
                    self.updateStack(key, undefined);
                });
                self._clearFileInput();
            };
            fnBefore = function (jqXHR) {
                self.lock();
                var outData = self._getOutData(jqXHR);
                if (self.showPreview) {
                    self._getThumbs().each(function () {
                        var $thumb = $(this), $btnUpload = $thumb.find('.kv-file-upload'),
                            $btnDelete = $thumb.find('.kv-file-remove');
                        if (!$thumb.hasClass('file-preview-success')) {
                            self._setThumbStatus($thumb, 'Loading');
                            $h.addCss($thumb, 'file-uploading');
                        }
                        $btnUpload.attr('disabled', true);
                        $btnDelete.attr('disabled', true);
                    });
                }
                self._raise('filebatchpreupload', [outData]);
                if (self._abort(outData)) {
                    jqXHR.abort();
                    self._setProgressCancelled();
                }
            };
            fnSuccess = function (data, textStatus, jqXHR) {
                /** @namespace data.errorkeys */
                var outData = self._getOutData(jqXHR, data), key = 0,
                    $thumbs = self._getThumbs(':not(.file-preview-success)'),
                    keys = $h.isEmpty(data) || $h.isEmpty(data.errorkeys) ? [] : data.errorkeys;

                if ($h.isEmpty(data) || $h.isEmpty(data.error)) {
                    self._raise('filebatchuploadsuccess', [outData]);
                    setAllUploaded();
                    if (self.showPreview) {
                        $thumbs.each(function () {
                            var $thumb = $(this);
                            self._setThumbStatus($thumb, 'Success');
                            $thumb.removeClass('file-uploading');
                            $thumb.find('.kv-file-upload').hide().removeAttr('disabled');
                        });
                        self._initUploadSuccess(data);
                    } else {
                        self.reset();
                    }
                    self._setProgress(101);
                } else {
                    if (self.showPreview) {
                        $thumbs.each(function () {
                            var $thumb = $(this), i = $thumb.attr('data-fileindex');
                            $thumb.removeClass('file-uploading');
                            $thumb.find('.kv-file-upload').removeAttr('disabled');
                            $thumb.find('.kv-file-remove').removeAttr('disabled');
                            if (keys.length === 0 || $.inArray(key, keys) !== -1) {
                                self._setPreviewError($thumb, i, self.filestack[i], self.retryErrorUploads);
                                if (!self.retryErrorUploads) {
                                    $thumb.find('.kv-file-upload').hide();
                                    self.updateStack(i, undefined);
                                }
                            } else {
                                $thumb.find('.kv-file-upload').hide();
                                self._setThumbStatus($thumb, 'Success');
                                self.updateStack(i, undefined);
                            }
                            if (!$thumb.hasClass('file-preview-error') || self.retryErrorUploads) {
                                key++;
                            }
                        });
                        self._initUploadSuccess(data);
                    }
                    self._showUploadError(data.error, outData, 'filebatchuploaderror');
                    self._setProgress(101, self.$progress, self.msgUploadError);
                }
            };
            fnComplete = function () {
                self.unlock();
                self._initSuccessThumbs();
                self._clearFileInput();
                self._raise('filebatchuploadcomplete', [self.filestack, self._getExtraData()]);
            };
            fnError = function (jqXHR, textStatus, errorThrown) {
                var outData = self._getOutData(jqXHR), op = self.ajaxOperations.uploadBatch,
                    errMsg = self._parseError(op, jqXHR, errorThrown);
                self._showUploadError(errMsg, outData, 'filebatchuploaderror');
                self.uploadFileCount = total - 1;
                if (!self.showPreview) {
                    return;
                }
                self._getThumbs().each(function () {
                    var $thumb = $(this), key = $thumb.attr('data-fileindex');
                    $thumb.removeClass('file-uploading');
                    if (self.filestack[key] !== undefined) {
                        self._setPreviewError($thumb);
                    }
                });
                self._getThumbs().removeClass('file-uploading');
                self._getThumbs(' .kv-file-upload').removeAttr('disabled');
                self._getThumbs(' .kv-file-delete').removeAttr('disabled');
                self._setProgress(101, self.$progress, self.msgAjaxProgressError.replace('{operation}', op));
            };
            $.each(files, function (key, data) {
                if (!$h.isEmpty(files[key])) {
                    self.formdata.append(self.uploadFileAttr, data, self.filenames[key]);
                }
            });
            self._ajaxSubmit(fnBefore, fnSuccess, fnComplete, fnError);
        },
        _uploadExtraOnly: function () {
            var self = this, params = {}, fnBefore, fnSuccess, fnComplete, fnError;
            self.formdata = new FormData();
            if (self._abort(params)) {
                return;
            }
            fnBefore = function (jqXHR) {
                self.lock();
                var outData = self._getOutData(jqXHR);
                self._raise('filebatchpreupload', [outData]);
                self._setProgress(50);
                params.data = outData;
                params.xhr = jqXHR;
                if (self._abort(params)) {
                    jqXHR.abort();
                    self._setProgressCancelled();
                }
            };
            fnSuccess = function (data, textStatus, jqXHR) {
                var outData = self._getOutData(jqXHR, data);
                if ($h.isEmpty(data) || $h.isEmpty(data.error)) {
                    self._raise('filebatchuploadsuccess', [outData]);
                    self._clearFileInput();
                    self._initUploadSuccess(data);
                    self._setProgress(101);
                } else {
                    self._showUploadError(data.error, outData, 'filebatchuploaderror');
                }
            };
            fnComplete = function () {
                self.unlock();
                self._clearFileInput();
                self._raise('filebatchuploadcomplete', [self.filestack, self._getExtraData()]);
            };
            fnError = function (jqXHR, textStatus, errorThrown) {
                var outData = self._getOutData(jqXHR), op = self.ajaxOperations.uploadExtra,
                    errMsg = self._parseError(op, jqXHR, errorThrown);
                params.data = outData;
                self._showUploadError(errMsg, outData, 'filebatchuploaderror');
                self._setProgress(101, self.$progress, self.msgAjaxProgressError.replace('{operation}', op));
            };
            self._ajaxSubmit(fnBefore, fnSuccess, fnComplete, fnError);
        },
        _deleteFileIndex: function ($frame) {
            var self = this, ind = $frame.attr('data-fileindex');
            if (ind.substring(0, 5) === 'init_') {
                ind = parseInt(ind.replace('init_', ''));
                self.initialPreview = $h.spliceArray(self.initialPreview, ind);
                self.initialPreviewConfig = $h.spliceArray(self.initialPreviewConfig, ind);
                self.initialPreviewThumbTags = $h.spliceArray(self.initialPreviewThumbTags, ind);
                self.getFrames().each(function () {
                    var $nFrame = $(this), nInd = $nFrame.attr('data-fileindex');
                    if (nInd.substring(0, 5) === 'init_') {
                        nInd = parseInt(nInd.replace('init_', ''));
                        if (nInd > ind) {
                            nInd--;
                            $nFrame.attr('data-fileindex', 'init_' + nInd);
                        }
                    }
                });
                if (self.uploadAsync) {
                    self.cacheInitialPreview = self.getPreview();
                }
            }
        },
        _initFileActions: function () {
            var self = this, $preview = self.$preview;
            if (!self.showPreview) {
                return;
            }
            self._initZoomButton();
            self.getFrames(' .kv-file-remove').each(function () {
                var $el = $(this), $frame = $el.closest($h.FRAMES), hasError, id = $frame.attr('id'),
                    ind = $frame.attr('data-fileindex'), n, cap, status;
                self._handler($el, 'click', function () {
                    status = self._raise('filepreremove', [id, ind]);
                    if (status === false || !self._validateMinCount()) {
                        return false;
                    }
                    hasError = $frame.hasClass('file-preview-error');
                    $h.cleanMemory($frame);
                    $frame.fadeOut('slow', function () {
                        $h.cleanZoomCache($preview.find('#zoom-' + id));
                        self.updateStack(ind, undefined);
                        self._clearObjects($frame);
                        $frame.remove();
                        if (id && hasError) {
                            self.$errorContainer.find('li[data-file-id="' + id + '"]').fadeOut('fast', function () {
                                $(this).remove();
                                if (!self._errorsExist()) {
                                    self._resetErrors();
                                }
                            });
                        }
                        self._clearFileInput();
                        var filestack = self.getFileStack(true), chk = self.previewCache.count(),
                            len = filestack.length, hasThumb = self.showPreview && self.getFrames().length;
                        if (len === 0 && chk === 0 && !hasThumb) {
                            self.reset();
                        } else {
                            n = chk + len;
                            cap = n > 1 ? self._getMsgSelected(n) : (filestack[0] ? self._getFileNames()[0] : '');
                            self._setCaption(cap);
                        }
                        self._raise('fileremoved', [id, ind]);
                    });
                });
            });
            self.getFrames(' .kv-file-upload').each(function () {
                var $el = $(this);
                self._handler($el, 'click', function () {
                    var $frame = $el.closest($h.FRAMES), ind = $frame.attr('data-fileindex');
                    self.$progress.hide();
                    if ($frame.hasClass('file-preview-error') && !self.retryErrorUploads) {
                        return;
                    }
                    self._uploadSingle(ind, false);
                });
            });
        },
        _initPreviewActions: function () {
            var self = this, $preview = self.$preview, deleteExtraData = self.deleteExtraData || {},
                btnRemove = $h.FRAMES + ' .kv-file-remove', settings = self.fileActionSettings,
                origClass = settings.removeClass, errClass = settings.removeErrorClass,
                resetProgress = function () {
                    var hasFiles = self.isAjaxUpload ? self.previewCache.count() : self.$element.get(0).files.length;
                    if (!$preview.find($h.FRAMES).length && !hasFiles) {
                        self._setCaption('');
                        self.reset();
                        self.initialCaption = '';
                    }
                };
            self._initZoomButton();
            $preview.find(btnRemove).each(function () {
                var $el = $(this), vUrl = $el.data('url') || self.deleteUrl, vKey = $el.data('key'),
                    fnBefore, fnSuccess, fnError;
                if ($h.isEmpty(vUrl) || vKey === undefined) {
                    return;
                }
                var $frame = $el.closest($h.FRAMES), cache = self.previewCache.data,
                    settings, params, index = $frame.attr('data-fileindex'), config, extraData;
                index = parseInt(index.replace('init_', ''));
                config = $h.isEmpty(cache.config) && $h.isEmpty(cache.config[index]) ? null : cache.config[index];
                extraData = $h.isEmpty(config) || $h.isEmpty(config.extra) ? deleteExtraData : config.extra;
                if (typeof extraData === "function") {
                    extraData = extraData();
                }
                params = {id: $el.attr('id'), key: vKey, extra: extraData};
                fnBefore = function (jqXHR) {
                    self.ajaxAborted = false;
                    self._raise('filepredelete', [vKey, jqXHR, extraData]);
                    $el.removeClass(errClass);
                    if (self._abort()) {
                        jqXHR.abort();
                    } else {
                        $h.addCss($frame, 'file-uploading');
                        $h.addCss($el, 'disabled ' + origClass);
                    }
                };
                fnSuccess = function (data, textStatus, jqXHR) {
                    var n, cap;
                    if (!$h.isEmpty(data) && !$h.isEmpty(data.error)) {
                        params.jqXHR = jqXHR;
                        params.response = data;
                        self._showError(data.error, params, 'filedeleteerror');
                        $frame.removeClass('file-uploading');
                        $el.removeClass('disabled ' + origClass).addClass(errClass);
                        resetProgress();
                        return;
                    }
                    $frame.removeClass('file-uploading').addClass('file-deleted');
                    $frame.fadeOut('slow', function () {
                        index = parseInt(($frame.attr('data-fileindex')).replace('init_', ''));
                        self.previewCache.unset(index);
                        n = self.previewCache.count();
                        cap = n > 0 ? self._getMsgSelected(n) : '';
                        self._deleteFileIndex($frame);
                        self._setCaption(cap);
                        self._raise('filedeleted', [vKey, jqXHR, extraData]);
                        $h.cleanZoomCache($preview.find('#zoom-' + $frame.attr('id')));
                        self._clearObjects($frame);
                        $frame.remove();
                        resetProgress();
                    });
                };
                fnError = function (jqXHR, textStatus, errorThrown) {
                    var op = self.ajaxOperations.deleteThumb, errMsg = self._parseError(op, jqXHR, errorThrown);
                    params.jqXHR = jqXHR;
                    params.response = {};
                    self._showError(errMsg, params, 'filedeleteerror');
                    $frame.removeClass('file-uploading');
                    $el.removeClass('disabled ' + origClass).addClass(errClass);
                    resetProgress();
                };
                self._mergeAjaxCallback('beforeSend', fnBefore, 'delete');
                self._mergeAjaxCallback('success', fnSuccess, 'delete');
                self._mergeAjaxCallback('error', fnError, 'delete');
                settings = $.extend(true, {}, {
                    url: vUrl,
                    type: 'POST',
                    dataType: 'json',
                    data: $.extend(true, {}, {key: vKey}, extraData)
                }, self.ajaxDeleteSettings);
                self._handler($el, 'click', function () {
                    if (!self._validateMinCount()) {
                        return false;
                    }
                    self.ajaxAborted = false;
                    self._raise('filebeforedelete', [vKey, extraData]);
                    //noinspection JSUnresolvedVariable,JSHint
                    if (self.ajaxAborted instanceof Promise) {
                        self.ajaxAborted.then(function (result) {
                            if (!result) {
                                $.ajax(settings);
                            }
                        });
                    } else {
                        if (!self.ajaxAborted) {
                            $.ajax(settings);
                        }
                    }
                });
            });
        },
        _hideFileIcon: function () {
            var self = this;
            if (self.overwriteInitial) {
                self.$captionContainer.removeClass('icon-visible');
            }
        },
        _showFileIcon: function () {
            var self = this;
            $h.addCss(self.$captionContainer, 'icon-visible');
        },
        _getSize: function (bytes) {
            var self = this, size = parseFloat(bytes), i, func = self.fileSizeGetter, sizes, out;
            if (!$.isNumeric(bytes) || !$.isNumeric(size)) {
                return '';
            }
            if (typeof func === 'function') {
                out = func(size);
            } else {
                if (size === 0) {
                    out = '0.00 B';
                } else {
                    i = Math.floor(Math.log(size) / Math.log(1024));
                    sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
                    out = (size / Math.pow(1024, i)).toFixed(2) * 1 + ' ' + sizes[i];
                }
            }
            return self._getLayoutTemplate('size').replace('{sizeText}', out);
        },
        _generatePreviewTemplate: function (cat, data, fname, ftype, previewId, isError, size, frameClass, foot, ind, templ) {
            var self = this, caption = self.slug(fname), prevContent, zoomContent = '', styleAttribs = '',
                screenW = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
                config = screenW < 400 ? (self.previewSettingsSmall[cat] || self.defaults.previewSettingsSmall[cat]) :
                    (self.previewSettings[cat] || self.defaults.previewSettings[cat]),
                footer = foot || self._renderFileFooter(caption, size, 'auto', isError),
                hasIconSetting = self._getPreviewIcon(fname), typeCss = 'type-default',
                forcePrevIcon = hasIconSetting && self.preferIconicPreview,
                forceZoomIcon = hasIconSetting && self.preferIconicZoomPreview, getContent;
            if (config) {
                $.each(config, function (key, val) {
                    styleAttribs += key + ':' + val + ';';
                });
            }
            getContent = function (c, d, zoom, frameCss) {
                var id = zoom ? 'zoom-' + previewId : previewId, tmplt = self._getPreviewTemplate(c),
                    css = (frameClass || '') + ' ' + frameCss;
                if (self.frameClass) {
                    css = self.frameClass + ' ' + css;
                }
                if (zoom) {
                    css = css.replace(' ' + $h.SORT_CSS, '');
                }
                tmplt = self._parseFilePreviewIcon(tmplt, fname);
                if (c === 'text') {
                    d = $h.htmlEncode(d);
                }
                if (cat === 'object' && !ftype) {
                    $.each(self.defaults.fileTypeSettings, function (key, func) {
                        if (key === 'object' || key === 'other') {
                            return;
                        }
                        if (func(fname, ftype)) {
                            typeCss = 'type-' + key;
                        }
                    });
                }
                return tmplt.setTokens({
                    'previewId': id,
                    'caption': caption,
                    'frameClass': css,
                    'type': ftype,
                    'fileindex': ind,
                    'typeCss': typeCss,
                    'footer': footer,
                    'data': d,
                    'template': templ || cat,
                    'style': styleAttribs ? 'style="' + styleAttribs + '"' : ''
                });
            };
            ind = ind || previewId.slice(previewId.lastIndexOf('-') + 1);
            if (self.fileActionSettings.showZoom) {
                zoomContent = getContent((forceZoomIcon ? 'other' : cat), data, true, 'kv-zoom-thumb');
            }
            zoomContent = '\n' + self._getLayoutTemplate('zoomCache').replace('{zoomContent}', zoomContent);
            prevContent = getContent((forcePrevIcon ? 'other' : cat), data, false, 'kv-preview-thumb');
            return prevContent + zoomContent;
        },
        _previewDefault: function (file, previewId, isDisabled) {
            var self = this, $preview = self.$preview;
            if (!self.showPreview) {
                return;
            }
            var fname = file ? file.name : '', ftype = file ? file.type : '', content, size = file.size || 0,
                caption = self.slug(fname), isError = isDisabled === true && !self.isAjaxUpload,
                data = $h.objUrl.createObjectURL(file);
            self._clearDefaultPreview();
            content = self._generatePreviewTemplate('other', data, fname, ftype, previewId, isError, size);
            $preview.append("\n" + content);
            self._setThumbAttr(previewId, caption, size);
            if (isDisabled === true && self.isAjaxUpload) {
                self._setThumbStatus($('#' + previewId), 'Error');
            }
        },
        _previewFile: function (i, file, theFile, previewId, data, fileInfo) {
            if (!this.showPreview) {
                return;
            }
            var self = this, fname = file ? file.name : '', ftype = fileInfo.type, caption = fileInfo.name,
                cat = self._parseFileType(ftype, fname), types = self.allowedPreviewTypes, content,
                mimes = self.allowedPreviewMimeTypes, $preview = self.$preview, fsize = file.size || 0,
                chkTypes = types && types.indexOf(cat) >= 0, chkMimes = mimes && mimes.indexOf(ftype) !== -1,
                iData = (cat === 'text' || cat === 'html' || cat === 'image') ? theFile.target.result : data;
            /** @namespace window.DOMPurify */
            if (cat === 'html' && self.purifyHtml && window.DOMPurify) {
                iData = window.DOMPurify.sanitize(iData);
            }
            if (chkTypes || chkMimes) {
                content = self._generatePreviewTemplate(cat, iData, fname, ftype, previewId, false, fsize);
                self._clearDefaultPreview();
                $preview.append("\n" + content);
                var $img = $preview.find('#' + previewId + ' img');
                if ($img.length && self.autoOrientImage) {
                    $h.validateOrientation(file, function (value) {
                        if (!value) {
                            self._validateImage(previewId, caption, ftype, fsize, iData);
                            return;
                        }
                        var $zoomImg = $preview.find('#zoom-' + previewId + ' img'), css = 'rotate-' + value;
                        if (value > 4) {
                            css += ($img.width() > $img.height() ? ' is-portrait-gt4' : ' is-landscape-gt4');
                        }
                        $h.addCss($img, css);
                        $h.addCss($zoomImg, css);
                        self._raise('fileimageoriented', {'$img': $img, 'file': file});
                        self._validateImage(previewId, caption, ftype, fsize, iData);
                        $h.adjustOrientedImage($img);
                    });
                } else {
                    self._validateImage(previewId, caption, ftype, fsize, iData);
                }
            } else {
                self._previewDefault(file, previewId);
            }
            self._setThumbAttr(previewId, caption, fsize);
            self._initSortable();
        },
        _setThumbAttr: function (id, caption, size) {
            var self = this, $frame = $('#' + id);
            if ($frame.length) {
                size = size && size > 0 ? self._getSize(size) : '';
                $frame.data({'caption': caption, 'size': size});
            }
        },
        _setInitThumbAttr: function () {
            var self = this, data = self.previewCache.data, len = self.previewCache.count(), config,
                caption, size, previewId;
            if (len === 0) {
                return;
            }
            for (var i = 0; i < len; i++) {
                config = data.config[i];
                previewId = self.previewInitId + '-' + 'init_' + i;
                caption = $h.ifSet('caption', config, $h.ifSet('filename', config));
                size = $h.ifSet('size', config);
                self._setThumbAttr(previewId, caption, size);
            }
        },
        _slugDefault: function (text) {
            return $h.isEmpty(text) ? '' : String(text).replace(/[\-\[\]\/\{}:;#%=\(\)\*\+\?\\\^\$\|<>&"']/g, '_');
        },
        _readFiles: function (files) {
            this.reader = new FileReader();
            var self = this, $el = self.$element, $preview = self.$preview, reader = self.reader,
                $container = self.$previewContainer, $status = self.$previewStatus, msgLoading = self.msgLoading,
                msgProgress = self.msgProgress, previewInitId = self.previewInitId, numFiles = files.length,
                settings = self.fileTypeSettings, ctr = self.filestack.length, readFile,
                fileTypes = self.allowedFileTypes, typLen = fileTypes ? fileTypes.length : 0,
                fileExt = self.allowedFileExtensions, strExt = $h.isEmpty(fileExt) ? '' : fileExt.join(', '),
                maxPreviewSize = self.maxFilePreviewSize && parseFloat(self.maxFilePreviewSize),
                canPreview = $preview.length && (!maxPreviewSize || isNaN(maxPreviewSize)),
                throwError = function (msg, file, previewId, index) {
                    var p1 = $.extend(true, {}, self._getOutData({}, {}, files), {id: previewId, index: index}),
                        p2 = {id: previewId, index: index, file: file, files: files}, $thumb;
                    self._previewDefault(file, previewId, true);
                    if (self.isAjaxUpload) {
                        self.addToStack(undefined);
                        setTimeout(function () {
                            readFile(index + 1);
                        }, 100);
                    } else {
                        numFiles = 0;
                    }
                    self._initFileActions();
                    $thumb = $('#' + previewId);
                    $thumb.find('.kv-file-upload').hide();
                    if (self.removeFromPreviewOnError) {
                        $thumb.remove();
                    }
                    self.isError = self.isAjaxUpload ? self._showUploadError(msg, p1) : self._showError(msg, p2);
                    self._updateFileDetails(numFiles);
                };

            self.loadedImages = [];
            self.totalImagesCount = 0;

            $.each(files, function (key, file) {
                var func = self.fileTypeSettings.image;
                if (func && func(file.type)) {
                    self.totalImagesCount++;
                }
            });
            readFile = function (i) {
                if ($h.isEmpty($el.attr('multiple'))) {
                    numFiles = 1;
                }
                if (i >= numFiles) {
                    if (self.isAjaxUpload && self.filestack.length > 0) {
                        self._raise('filebatchselected', [self.getFileStack()]);
                    } else {
                        self._raise('filebatchselected', [files]);
                    }
                    $container.removeClass('file-thumb-loading');
                    $status.html('');
                    return;
                }
                var node = ctr + i, previewId = previewInitId + "-" + node, file = files[i], fSizeKB, j, msg,
                    fnText = settings.text, fnImage = settings.image, fnHtml = settings.html, typ, chk, typ1, typ2,
                    caption = file.name ? self.slug(file.name) : '', fileSize = (file.size || 0) / 1000,
                    fileExtExpr = '', previewData = $h.objUrl.createObjectURL(file), fileCount = 0, strTypes = '',
                    func, knownTypes = 0, isText, isHtml, isImage, txtFlag, processFileLoaded = function () {
                        var msg = msgProgress.setTokens({
                            'index': i + 1,
                            'files': numFiles,
                            'percent': 50,
                            'name': caption
                        });
                        setTimeout(function () {
                            $status.html(msg);
                            self._updateFileDetails(numFiles);
                            readFile(i + 1);
                        }, 100);
                        self._raise('fileloaded', [file, previewId, i, reader]);
                    };
                if (typLen > 0) {
                    for (j = 0; j < typLen; j++) {
                        typ1 = fileTypes[j];
                        typ2 = self.msgFileTypes[typ1] || typ1;
                        strTypes += j === 0 ? typ2 : ', ' + typ2;
                    }
                }
                if (caption === false) {
                    readFile(i + 1);
                    return;
                }
                if (caption.length === 0) {
                    msg = self.msgInvalidFileName.replace('{name}', $h.htmlEncode(file.name));
                    throwError(msg, file, previewId, i);
                    return;
                }
                if (!$h.isEmpty(fileExt)) {
                    fileExtExpr = new RegExp('\\.(' + fileExt.join('|') + ')$', 'i');
                }
                fSizeKB = fileSize.toFixed(2);
                if (self.maxFileSize > 0 && fileSize > self.maxFileSize) {
                    msg = self.msgSizeTooLarge.setTokens({
                        'name': caption,
                        'size': fSizeKB,
                        'maxSize': self.maxFileSize
                    });
                    throwError(msg, file, previewId, i);
                    return;
                }
                if (self.minFileSize !== null && fileSize <= $h.getNum(self.minFileSize)) {
                    msg = self.msgSizeTooSmall.setTokens({
                        'name': caption,
                        'size': fSizeKB,
                        'minSize': self.minFileSize
                    });
                    throwError(msg, file, previewId, i);
                    return;
                }
                if (!$h.isEmpty(fileTypes) && $h.isArray(fileTypes)) {
                    for (j = 0; j < fileTypes.length; j += 1) {
                        typ = fileTypes[j];
                        func = settings[typ];
                        fileCount += !func || (typeof func !== 'function') ? 0 : (func(file.type, file.name) ? 1 : 0);
                    }
                    if (fileCount === 0) {
                        msg = self.msgInvalidFileType.setTokens({'name': caption, 'types': strTypes});
                        throwError(msg, file, previewId, i);
                        return;
                    }
                }
                if (fileCount === 0 && !$h.isEmpty(fileExt) && $h.isArray(fileExt) && !$h.isEmpty(fileExtExpr)) {
                    chk = $h.compare(caption, fileExtExpr);
                    fileCount += $h.isEmpty(chk) ? 0 : chk.length;
                    if (fileCount === 0) {
                        msg = self.msgInvalidFileExtension.setTokens({'name': caption, 'extensions': strExt});
                        throwError(msg, file, previewId, i);
                        return;
                    }
                }
                if (!self.showPreview) {
                    if (self.isAjaxUpload) {
                        self.addToStack(file);
                    }
                    setTimeout(function () {
                        readFile(i + 1);
                        self._updateFileDetails(numFiles);
                    }, 100);
                    self._raise('fileloaded', [file, previewId, i, reader]);
                    return;
                }
                if (!canPreview && fileSize > maxPreviewSize) {
                    self.addToStack(file);
                    $container.addClass('file-thumb-loading');
                    self._previewDefault(file, previewId);
                    self._initFileActions();
                    self._updateFileDetails(numFiles);
                    readFile(i + 1);
                    return;
                }
                if ($preview.length && FileReader !== undefined) {
                    isText = fnText(file.type, caption);
                    isHtml = fnHtml(file.type, caption);
                    isImage = fnImage(file.type, caption);
                    $status.html(msgLoading.replace('{index}', i + 1).replace('{files}', numFiles));
                    $container.addClass('file-thumb-loading');
                    reader.onerror = function (evt) {
                        self._errorHandler(evt, caption);
                    };
                    reader.onload = function (theFile) {
                        var uint, hex, fileInfo, bytes = [], contents, mime, readTextImage = function (textFlag) {
                            var newReader = new FileReader();
                            newReader.onerror = function (theFileNew) {
                                self._errorHandler(theFileNew, caption);
                            };
                            newReader.onload = function (theFileNew) {
                                self._previewFile(i, file, theFileNew, previewId, previewData, fileInfo);
                                self._initFileActions();
                                processFileLoaded();
                            };
                            if (textFlag) {
                                newReader.readAsText(file, self.textEncoding);
                            } else {
                                newReader.readAsDataURL(file);
                            }
                        };
                        fileInfo = {'name': caption, 'type': file.type};
                        $.each(settings, function (key, func) {
                            if (key !== 'object' && key !== 'other' && func(file.type, caption)) {
                                knownTypes++;
                            }
                        });
                        if (knownTypes === 0) {// auto detect mime types from content if no known file types detected
                            uint = new Uint8Array(theFile.target.result);
                            uint.forEach(function (byte) {
                                bytes.push(byte.toString(16));
                            });
                            hex = bytes.join('').toLowerCase().substring(0, 8);
                            mime = $h.getMimeType(hex, '', '');

                            if ($h.isEmpty(mime)) { // look for ascii text content
                                contents = $h.arrayBuffer2String(reader.result);
                                mime = $h.isSvg(contents) ? 'image/svg+xml' : $h.getMimeType(hex, contents, file.type);
                            }
                            fileInfo = {'name': caption, 'type': mime};
                            isText = fnText(mime, '');
                            isHtml = fnHtml(mime, '');
                            isImage = fnImage(mime, '');
                            txtFlag = isText || isHtml;
                            if (txtFlag || isImage) {
                                readTextImage(txtFlag);
                                return;
                            }
                        }
                        self._previewFile(i, file, theFile, previewId, previewData, fileInfo);
                        self._initFileActions();
                        processFileLoaded();
                    };
                    reader.onprogress = function (data) {
                        if (data.lengthComputable) {
                            var fact = (data.loaded / data.total) * 100, progress = Math.ceil(fact);
                            msg = msgProgress.setTokens({
                                'index': i + 1,
                                'files': numFiles,
                                'percent': progress,
                                'name': caption
                            });
                            setTimeout(function () {
                                $status.html(msg);
                            }, 100);
                        }
                    };

                    if (isText || isHtml) {
                        reader.readAsText(file, self.textEncoding);
                    } else {
                        if (isImage) {
                            reader.readAsDataURL(file);
                        } else {
                            reader.readAsArrayBuffer(file);
                        }
                    }
                } else {
                    self._previewDefault(file, previewId);
                    setTimeout(function () {
                        readFile(i + 1);
                        self._updateFileDetails(numFiles);
                    }, 100);
                    self._raise('fileloaded', [file, previewId, i, reader]);
                }
                self.addToStack(file);
            };

            readFile(0);
            self._updateFileDetails(numFiles, false);
        },
        _updateFileDetails: function (numFiles) {
            var self = this, $el = self.$element, fileStack = self.getFileStack(),
                name = ($h.isIE(9) && $h.findFileName($el.val())) ||
                    ($el[0].files[0] && $el[0].files[0].name) || (fileStack.length && fileStack[0].name) || '',
                label = self.slug(name), n = self.isAjaxUpload ? fileStack.length : numFiles,
                nFiles = self.previewCache.count() + n, log = n === 1 ? label : self._getMsgSelected(nFiles);
            if (self.isError) {
                self.$previewContainer.removeClass('file-thumb-loading');
                self.$previewStatus.html('');
                self.$captionContainer.removeClass('icon-visible');
            } else {
                self._showFileIcon();
            }
            self._setCaption(log, self.isError);
            self.$container.removeClass('file-input-new file-input-ajax-new');
            if (arguments.length === 1) {
                self._raise('fileselect', [numFiles, label]);
            }
            if (self.previewCache.count()) {
                self._initPreviewActions();
            }
        },
        _setThumbStatus: function ($thumb, status) {
            var self = this;
            if (!self.showPreview) {
                return;
            }
            var icon = 'indicator' + status, msg = icon + 'Title',
                css = 'file-preview-' + status.toLowerCase(),
                $indicator = $thumb.find('.file-upload-indicator'),
                config = self.fileActionSettings;
            $thumb.removeClass('file-preview-success file-preview-error file-preview-loading');
            if (status === 'Success') {
                $thumb.find('.file-drag-handle').remove();
            }
            $indicator.html(config[icon]);
            $indicator.attr('title', config[msg]);
            $thumb.addClass(css);
            if (status === 'Error' && !self.retryErrorUploads) {
                $thumb.find('.kv-file-upload').attr('disabled', true);
            }
        },
        _setProgressCancelled: function () {
            var self = this;
            self._setProgress(101, self.$progress, self.msgCancelled);
        },
        _setProgress: function (p, $el, error) {
            var self = this, pct = Math.min(p, 100), out, pctLimit = self.progressUploadThreshold,
                t = p <= 100 ? self.progressTemplate : self.progressCompleteTemplate,
                template = pct < 100 ? self.progressTemplate : (error ? self.progressErrorTemplate : t);
            $el = $el || self.$progress;
            if (!$h.isEmpty(template)) {
                if (pctLimit && pct > pctLimit && p <= 100) {
                    out = template.setTokens({'percent': pctLimit, 'status': self.msgUploadThreshold});
                } else {
                    out = template.setTokens({'percent': pct, 'status': (p > 100 ? self.msgUploadEnd : pct + '%')});
                }
                $el.html(out);
                if (error) {
                    $el.find('[role="progressbar"]').html(error);
                }
            }
        },
        _setFileDropZoneTitle: function () {
            var self = this, $zone = self.$container.find('.file-drop-zone'), title = self.dropZoneTitle, strFiles;
            if (self.isClickable) {
                strFiles = $h.isEmpty(self.$element.attr('multiple')) ? self.fileSingle : self.filePlural;
                title += self.dropZoneClickTitle.replace('{files}', strFiles);
            }
            $zone.find('.' + self.dropZoneTitleClass).remove();
            if (!self.isAjaxUpload || !self.showPreview || $zone.length === 0 || self.getFileStack().length > 0 || !self.dropZoneEnabled) {
                return;
            }
            if ($zone.find($h.FRAMES).length === 0 && $h.isEmpty(self.defaultPreviewContent)) {
                $zone.prepend('<div class="' + self.dropZoneTitleClass + '">' + title + '</div>');
            }
            self.$container.removeClass('file-input-new');
            $h.addCss(self.$container, 'file-input-ajax-new');
        },
        _setAsyncUploadStatus: function (previewId, pct, total) {
            var self = this, sum = 0;
            self._setProgress(pct, $('#' + previewId).find('.file-thumb-progress'));
            self.uploadStatus[previewId] = pct;
            $.each(self.uploadStatus, function (key, value) {
                sum += value;
            });
            self._setProgress(Math.floor(sum / total));
        },
        _validateMinCount: function () {
            var self = this, len = self.isAjaxUpload ? self.getFileStack().length : self.$element.get(0).files.length;
            if (self.validateInitialCount && self.minFileCount > 0 && self._getFileCount(len - 1) < self.minFileCount) {
                self._noFilesError({});
                return false;
            }
            return true;
        },
        _getFileCount: function (fileCount) {
            var self = this, addCount = 0;
            if (self.validateInitialCount && !self.overwriteInitial) {
                addCount = self.previewCache.count();
                fileCount += addCount;
            }
            return fileCount;
        },
        _getFileId: function (file) {
            var self = this, custom = self.generateFileId, relativePath;
            if (typeof custom === 'function') {
                return custom(file, event);
            }
            if (!file) {
                return null;
            }
            /** @namespace file.webkitRelativePath */
            relativePath = String(file.webkitRelativePath || file.fileName || file.name || null);
            if (!relativePath) {
                return null;
            }
            return (file.size + '-' + relativePath.replace(/[^0-9a-zA-Z_-]/img, ''));
        },
        _getFileName: function (file) {
            return file && file.name ? this.slug(file.name) : undefined;
        },
        _getFileIds: function (skipNull) {
            var self = this;
            return self.fileids.filter(function (n) {
                return (skipNull ? n !== undefined : n !== undefined && n !== null);
            });
        },
        _getFileNames: function (skipNull) {
            var self = this;
            return self.filenames.filter(function (n) {
                return (skipNull ? n !== undefined : n !== undefined && n !== null);
            });
        },
        _setPreviewError: function ($thumb, i, val, repeat) {
            var self = this;
            if (i !== undefined) {
                self.updateStack(i, val);
            }
            if (!self.showPreview) {
                return;
            }
            if (self.removeFromPreviewOnError && !repeat) {
                $thumb.remove();
                return;
            } else {
                self._setThumbStatus($thumb, 'Error');
            }
            self._refreshUploadButton($thumb, repeat);
        },
        _refreshUploadButton: function ($thumb, repeat) {
            var self = this, $btn = $thumb.find('.kv-file-upload'), cfg = self.fileActionSettings,
                icon = cfg.uploadIcon, title = cfg.uploadTitle;
            if (!$btn.length) {
                return;
            }
            if (repeat) {
                icon = cfg.uploadRetryIcon;
                title = cfg.uploadRetryTitle;
            }
            $btn.attr('title', title).html(icon);
        },
        _checkDimensions: function (i, chk, $img, $thumb, fname, type, params) {
            var self = this, msg, dim, tag = chk === 'Small' ? 'min' : 'max', limit = self[tag + 'Image' + type],
                $imgEl, isValid;
            if ($h.isEmpty(limit) || !$img.length) {
                return;
            }
            $imgEl = $img[0];
            dim = (type === 'Width') ? $imgEl.naturalWidth || $imgEl.width : $imgEl.naturalHeight || $imgEl.height;
            isValid = chk === 'Small' ? dim >= limit : dim <= limit;
            if (isValid) {
                return;
            }
            msg = self['msgImage' + type + chk].setTokens({'name': fname, 'size': limit});
            self._showUploadError(msg, params);
            self._setPreviewError($thumb, i, null);
        },
        _validateImage: function (previewId, fname, ftype, fsize, iData) {
            var self = this, $preview = self.$preview, params, w1, w2, $thumb = $preview.find("#" + previewId),
                i = $thumb.attr('data-fileindex'), $img = $thumb.find('img'), exifObject;
            fname = fname || 'Untitled';
            $img.one('load', function () {
                w1 = $thumb.width();
                w2 = $preview.width();
                if (w1 > w2) {
                    $img.css('width', '100%');
                }
                params = {ind: i, id: previewId};
                self._checkDimensions(i, 'Small', $img, $thumb, fname, 'Width', params);
                self._checkDimensions(i, 'Small', $img, $thumb, fname, 'Height', params);
                if (!self.resizeImage) {
                    self._checkDimensions(i, 'Large', $img, $thumb, fname, 'Width', params);
                    self._checkDimensions(i, 'Large', $img, $thumb, fname, 'Height', params);
                }
                self._raise('fileimageloaded', [previewId]);
                try {
                    exifObject = window.piexif ? window.piexif.load(iData) : null;
                } catch (err) {
                    exifObject = null;
                }
                self.loadedImages.push({
                    ind: i,
                    img: $img,
                    thumb: $thumb,
                    pid: previewId,
                    typ: ftype,
                    siz: fsize,
                    validated: false,
                    imgData: iData,
                    exifObj: exifObject
                });
                $thumb.data('exif', exifObject);
                self._validateAllImages();
            }).one('error', function () {
                self._raise('fileimageloaderror', [previewId]);
            }).each(function () {
                if (this.complete) {
                    $(this).trigger('load');
                } else {
                    if (this.error) {
                        $(this).trigger('error');
                    }
                }
            });
        },
        _validateAllImages: function () {
            var self = this, i, counter = {val: 0}, numImgs = self.loadedImages.length, config,
                fsize, minSize = self.resizeIfSizeMoreThan;
            if (numImgs !== self.totalImagesCount) {
                return;
            }
            self._raise('fileimagesloaded');
            if (!self.resizeImage) {
                return;
            }
            for (i = 0; i < self.loadedImages.length; i++) {
                config = self.loadedImages[i];
                if (config.validated) {
                    continue;
                }
                fsize = config.siz;
                if (fsize && fsize > minSize * 1000) {
                    self._getResizedImage(config, counter, numImgs);
                }
                self.loadedImages[i].validated = true;
            }
        },
        _getResizedImage: function (config, counter, numImgs) {
            var self = this, img = $(config.img)[0], width = img.naturalWidth, height = img.naturalHeight, blob,
                ratio = 1, maxWidth = self.maxImageWidth || width, maxHeight = self.maxImageHeight || height,
                isValidImage = !!(width && height), chkWidth, chkHeight, canvas = self.imageCanvas, dataURI,
                context = self.imageCanvasContext, type = config.typ, pid = config.pid, ind = config.ind,
                $thumb = config.thumb, throwError, msg, exifObj = config.exifObj, exifStr;
            throwError = function (msg, params, ev) {
                if (self.isAjaxUpload) {
                    self._showUploadError(msg, params, ev);
                } else {
                    self._showError(msg, params, ev);
                }
                self._setPreviewError($thumb, ind);
            };
            if (!self.filestack[ind] || !isValidImage || (width <= maxWidth && height <= maxHeight)) {
                if (isValidImage && self.filestack[ind]) {
                    self._raise('fileimageresized', [pid, ind]);
                }
                counter.val++;
                if (counter.val === numImgs) {
                    self._raise('fileimagesresized');
                }
                if (!isValidImage) {
                    throwError(self.msgImageResizeError, {id: pid, 'index': ind}, 'fileimageresizeerror');
                    return;
                }
            }
            type = type || self.resizeDefaultImageType;
            chkWidth = width > maxWidth;
            chkHeight = height > maxHeight;
            if (self.resizePreference === 'width') {
                ratio = chkWidth ? maxWidth / width : (chkHeight ? maxHeight / height : 1);
            } else {
                ratio = chkHeight ? maxHeight / height : (chkWidth ? maxWidth / width : 1);
            }
            self._resetCanvas();
            width *= ratio;
            height *= ratio;
            canvas.width = width;
            canvas.height = height;
            try {
                context.drawImage(img, 0, 0, width, height);
                dataURI = canvas.toDataURL(type, self.resizeQuality);
                if (exifObj) {
                    exifStr = window.piexif.dump(exifObj);
                    dataURI = window.piexif.insert(exifStr, dataURI);
                }
                blob = $h.dataURI2Blob(dataURI);
                self.filestack[ind] = blob;
                self._raise('fileimageresized', [pid, ind]);
                counter.val++;
                if (counter.val === numImgs) {
                    self._raise('fileimagesresized', [undefined, undefined]);
                }
                if (!(blob instanceof Blob)) {
                    throwError(self.msgImageResizeError, {id: pid, 'index': ind}, 'fileimageresizeerror');
                }
            }
            catch (err) {
                counter.val++;
                if (counter.val === numImgs) {
                    self._raise('fileimagesresized', [undefined, undefined]);
                }
                msg = self.msgImageResizeException.replace('{errors}', err.message);
                throwError(msg, {id: pid, 'index': ind}, 'fileimageresizeexception');
            }
        },
        _initBrowse: function ($container) {
            var self = this;
            if (self.showBrowse) {
                self.$btnFile = $container.find('.btn-file');
                self.$btnFile.append(self.$element);
            } else {
                self.$element.hide();
            }
        },
        _initCaption: function () {
            var self = this, cap = self.initialCaption || '';
            if (self.overwriteInitial || $h.isEmpty(cap)) {
                self.$caption.val('');
                return false;
            }
            self._setCaption(cap);
            return true;
        },
        _setCaption: function (content, isError) {
            var self = this, title, out, icon, n, cap, stack = self.getFileStack();
            if (!self.$caption.length) {
                return;
            }
            self.$captionContainer.removeClass('icon-visible');
            if (isError) {
                title = $('<div>' + self.msgValidationError + '</div>').text();
                n = stack.length;
                if (n) {
                    cap = n === 1 && stack[0] ? self._getFileNames()[0] : self._getMsgSelected(n);
                } else {
                    cap = self._getMsgSelected(self.msgNo);
                }
                out = $h.isEmpty(content) ? cap : content;
                icon = '<span class="' + self.msgValidationErrorClass + '">' + self.msgValidationErrorIcon + '</span>';
            } else {
                if ($h.isEmpty(content)) {
                    return;
                }
                title = $('<div>' + content + '</div>').text();
                out = title;
                icon = self._getLayoutTemplate('fileIcon');
            }
            self.$captionContainer.addClass('icon-visible');
            self.$caption.attr('title', title).val(out);
            self.$captionIcon.html(icon);
        },
        _createContainer: function () {
            var self = this, attribs = {"class": 'file-input file-input-new' + (self.rtl ? ' kv-rtl' : '')},
                $container = $(document.createElement("div")).attr(attribs).html(self._renderMain());
            self.$element.before($container);
            self._initBrowse($container);
            if (self.theme) {
                $container.addClass('theme-' + self.theme);
            }
            return $container;
        },
        _refreshContainer: function () {
            var self = this, $container = self.$container;
            $container.before(self.$element);
            $container.html(self._renderMain());
            self._initBrowse($container);
            self._validateDisabled();
        },
        _validateDisabled: function () {
            var self = this;
            self.$caption.attr({readonly: self.isDisabled});
        },
        _renderMain: function () {
            var self = this,
                dropCss = (self.isAjaxUpload && self.dropZoneEnabled) ? ' file-drop-zone' : 'file-drop-disabled',
                close = !self.showClose ? '' : self._getLayoutTemplate('close'),
                preview = !self.showPreview ? '' : self._getLayoutTemplate('preview')
                    .setTokens({'class': self.previewClass, 'dropClass': dropCss}),
                css = self.isDisabled ? self.captionClass + ' file-caption-disabled' : self.captionClass,
                caption = self.captionTemplate.setTokens({'class': css + ' kv-fileinput-caption'});
            return self.mainTemplate.setTokens({
                'class': self.mainClass + (!self.showBrowse && self.showCaption ? ' no-browse' : ''),
                'preview': preview,
                'close': close,
                'caption': caption,
                'upload': self._renderButton('upload'),
                'remove': self._renderButton('remove'),
                'cancel': self._renderButton('cancel'),
                'browse': self._renderButton('browse')
            });

        },
        _renderButton: function (type) {
            var self = this, tmplt = self._getLayoutTemplate('btnDefault'), css = self[type + 'Class'],
                title = self[type + 'Title'], icon = self[type + 'Icon'], label = self[type + 'Label'],
                status = self.isDisabled ? ' disabled' : '', btnType = 'button';
            switch (type) {
                case 'remove':
                    if (!self.showRemove) {
                        return '';
                    }
                    break;
                case 'cancel':
                    if (!self.showCancel) {
                        return '';
                    }
                    css += ' kv-hidden';
                    break;
                case 'upload':
                    if (!self.showUpload) {
                        return '';
                    }
                    if (self.isAjaxUpload && !self.isDisabled) {
                        tmplt = self._getLayoutTemplate('btnLink').replace('{href}', self.uploadUrl);
                    } else {
                        btnType = 'submit';
                    }
                    break;
                case 'browse':
                    if (!self.showBrowse) {
                        return '';
                    }
                    tmplt = self._getLayoutTemplate('btnBrowse');
                    break;
                default:
                    return '';
            }

            css += type === 'browse' ? ' btn-file' : ' fileinput-' + type + ' fileinput-' + type + '-button';
            if (!$h.isEmpty(label)) {
                label = ' <span class="' + self.buttonLabelClass + '">' + label + '</span>';
            }
            return tmplt.setTokens({
                'type': btnType, 'css': css, 'title': title, 'status': status, 'icon': icon, 'label': label
            });
        },
        _renderThumbProgress: function () {
            var self = this;
            return '<div class="file-thumb-progress kv-hidden">' +
                self.progressTemplate.setTokens({'percent': '0', 'status': self.msgUploadBegin}) +
                '</div>';
        },
        _renderFileFooter: function (caption, size, width, isError) {
            var self = this, config = self.fileActionSettings, rem = config.showRemove, drg = config.showDrag,
                upl = config.showUpload, zoom = config.showZoom, out,
                template = self._getLayoutTemplate('footer'), tInd = self._getLayoutTemplate('indicator'),
                ind = isError ? config.indicatorError : config.indicatorNew,
                title = isError ? config.indicatorErrorTitle : config.indicatorNewTitle,
                indicator = tInd.setTokens({'indicator': ind, 'indicatorTitle': title});
            size = self._getSize(size);
            if (self.isAjaxUpload) {
                out = template.setTokens({
                    'actions': self._renderFileActions(upl, false, rem, zoom, drg, false, false, false),
                    'caption': caption,
                    'size': size,
                    'width': width,
                    'progress': self._renderThumbProgress(),
                    'indicator': indicator
                });
            } else {
                out = template.setTokens({
                    'actions': self._renderFileActions(false, false, false, zoom, drg, false, false, false),
                    'caption': caption,
                    'size': size,
                    'width': width,
                    'progress': '',
                    'indicator': indicator
                });
            }
            out = $h.replaceTags(out, self.previewThumbTags);
            return out;
        },
        _renderFileActions: function (showUpl, showDwn, showDel, showZoom, showDrag, disabled, url, key, isInit, dUrl, dFile) {
            if (!showUpl && !showDwn && !showDel && !showZoom && !showDrag) {
                return '';
            }
            var self = this, vUrl = url === false ? '' : ' data-url="' + url + '"',
                vKey = key === false ? '' : ' data-key="' + key + '"', btnDelete = '', btnUpload = '', btnDownload = '',
                btnZoom = '', btnDrag = '', css, template = self._getLayoutTemplate('actions'),
                config = self.fileActionSettings,
                otherButtons = self.otherActionButtons.setTokens({'dataKey': vKey, 'key': key}),
                removeClass = disabled ? config.removeClass + ' disabled' : config.removeClass;
            if (showDel) {
                btnDelete = self._getLayoutTemplate('actionDelete').setTokens({
                    'removeClass': removeClass,
                    'removeIcon': config.removeIcon,
                    'removeTitle': config.removeTitle,
                    'dataUrl': vUrl,
                    'dataKey': vKey,
                    'key': key
                });
            }
            if (showUpl) {
                btnUpload = self._getLayoutTemplate('actionUpload').setTokens({
                    'uploadClass': config.uploadClass,
                    'uploadIcon': config.uploadIcon,
                    'uploadTitle': config.uploadTitle
                });
            }
            if (showDwn) {
                btnDownload = self._getLayoutTemplate('actionDownload').setTokens({
                    'downloadClass': config.downloadClass,
                    'downloadIcon': config.downloadIcon,
                    'downloadTitle': config.downloadTitle,
                    'downloadUrl': dUrl || self.initialPreviewDownloadUrl
                });
                btnDownload = btnDownload.setTokens({'filename': dFile, 'key': key});
            }
            if (showZoom) {
                btnZoom = self._getLayoutTemplate('actionZoom').setTokens({
                    'zoomClass': config.zoomClass,
                    'zoomIcon': config.zoomIcon,
                    'zoomTitle': config.zoomTitle
                });
            }
            if (showDrag && isInit) {
                css = 'drag-handle-init ' + config.dragClass;
                btnDrag = self._getLayoutTemplate('actionDrag').setTokens({
                    'dragClass': css,
                    'dragTitle': config.dragTitle,
                    'dragIcon': config.dragIcon
                });
            }
            return template.setTokens({
                'delete': btnDelete,
                'upload': btnUpload,
                'download': btnDownload,
                'zoom': btnZoom,
                'drag': btnDrag,
                'other': otherButtons
            });
        },
        _browse: function (e) {
            var self = this;
            self._raise('filebrowse');
            if (e && e.isDefaultPrevented()) {
                return;
            }
            if (self.isError && !self.isAjaxUpload) {
                self.clear();
            }
            self.$captionContainer.focus();
        },
        _filterDuplicate: function (file, files, fileIds) {
            var self = this, fileId = self._getFileId(file);
            if (fileId && fileIds && fileIds.indexOf(fileId) > -1) {
                return;
            }
            if (!fileIds) {
                fileIds = [];
            }
            files.push(file);
            fileIds.push(fileId);
        },
        _change: function (e) {
            var self = this, $el = self.$element;
            if (!self.isAjaxUpload && $h.isEmpty($el.val()) && self.fileInputCleared) { // IE 11 fix
                self.fileInputCleared = false;
                return;
            }
            self.fileInputCleared = false;
            var tfiles = [], msg, total, isDragDrop = arguments.length > 1, isAjaxUpload = self.isAjaxUpload, n, len,
                files = isDragDrop ? e.originalEvent.dataTransfer.files : $el.get(0).files, ctr = self.filestack.length,
                isSingleUpload = $h.isEmpty($el.attr('multiple')), flagSingle = (isSingleUpload && ctr > 0),
                folders = 0, fileIds = self._getFileIds(), throwError = function (mesg, file, previewId, index) {
                    var p1 = $.extend(true, {}, self._getOutData({}, {}, files), {id: previewId, index: index}),
                        p2 = {id: previewId, index: index, file: file, files: files};
                    return self.isAjaxUpload ? self._showUploadError(mesg, p1) : self._showError(mesg, p2);
                };
            self.reader = null;
            self._resetUpload();
            self._hideFileIcon();
            if (self.isAjaxUpload) {
                self.$container.find('.file-drop-zone .' + self.dropZoneTitleClass).remove();
            }
            if (isDragDrop) {
                $.each(files, function (i, f) {
                    if (f && !f.type && f.size !== undefined && f.size % 4096 === 0) {
                        folders++;
                    } else {
                        self._filterDuplicate(f, tfiles, fileIds);
                    }
                });
            } else {
                if (e.target && e.target.files === undefined) {
                    files = e.target.value ? [{name: e.target.value.replace(/^.+\\/, '')}] : [];
                } else {
                    files = e.target.files || {};
                }
                if (isAjaxUpload) {
                    $.each(files, function (i, f) {
                        self._filterDuplicate(f, tfiles, fileIds);
                    });
                } else {
                    tfiles = files;
                }
            }
            if ($h.isEmpty(tfiles) || tfiles.length === 0) {
                if (!isAjaxUpload) {
                    self.clear();
                }
                self._showFolderError(folders);
                self._raise('fileselectnone');
                return;
            }
            self._resetErrors();
            len = tfiles.length;
            total = self._getFileCount(self.isAjaxUpload ? (self.getFileStack().length + len) : len);
            if (self.maxFileCount > 0 && total > self.maxFileCount) {
                if (!self.autoReplace || len > self.maxFileCount) {
                    n = (self.autoReplace && len > self.maxFileCount) ? len : total;
                    msg = self.msgFilesTooMany.replace('{m}', self.maxFileCount).replace('{n}', n);
                    self.isError = throwError(msg, null, null, null);
                    self.$captionContainer.removeClass('icon-visible');
                    self._setCaption('', true);
                    self.$container.removeClass('file-input-new file-input-ajax-new');
                    return;
                }
                if (total > self.maxFileCount) {
                    self._resetPreviewThumbs(isAjaxUpload);
                }
            } else {
                if (!isAjaxUpload || flagSingle) {
                    self._resetPreviewThumbs(false);
                    if (flagSingle) {
                        self.clearStack();
                    }
                } else {
                    if (isAjaxUpload && ctr === 0 && (!self.previewCache.count() || self.overwriteInitial)) {
                        self._resetPreviewThumbs(true);
                    }
                }
            }
            if (self.isPreviewable) {
                self._readFiles(tfiles);
            } else {
                self._updateFileDetails(1);
            }
            self._showFolderError(folders);
        },
        _abort: function (params) {
            var self = this, data;
            if (self.ajaxAborted && typeof self.ajaxAborted === "object" && self.ajaxAborted.message !== undefined) {
                data = $.extend(true, {}, self._getOutData(), params);
                data.abortData = self.ajaxAborted.data || {};
                data.abortMessage = self.ajaxAborted.message;
                self._setProgress(101, self.$progress, self.msgCancelled);
                self._showUploadError(self.ajaxAborted.message, data, 'filecustomerror');
                self.cancel();
                return true;
            }
            return false;
        },
        _resetFileStack: function () {
            var self = this, i = 0, newstack = [], newnames = [], newids = [];
            self._getThumbs().each(function () {
                var $thumb = $(this), ind = $thumb.attr('data-fileindex'), file = self.filestack[ind],
                    pid = $thumb.attr('id'), newId;
                if (ind === '-1' || ind === -1) {
                    return;
                }
                if (file !== undefined) {
                    newstack[i] = file;
                    newnames[i] = self._getFileName(file);
                    newids[i] = self._getFileId(file);
                    $thumb.attr({'id': self.previewInitId + '-' + i, 'data-fileindex': i});
                    i++;
                } else {
                    newId = 'uploaded-' + $h.uniqId();
                    $thumb.attr({'id': newId, 'data-fileindex': '-1'});
                    self.$preview.find('#zoom-' + pid).attr('id', 'zoom-' + newId);
                }
            });
            self.filestack = newstack;
            self.filenames = newnames;
            self.fileids = newids;
        },
        _isFileSelectionValid: function (cnt) {
            var self = this;
            cnt = cnt || 0;
            if (self.required && !self.getFilesCount()) {
                self.$errorContainer.html('');
                self._showUploadError(self.msgFileRequired);
                return false;
            }
            if (self.minFileCount > 0 && self._getFileCount(cnt) < self.minFileCount) {
                self._noFilesError({});
                return false;
            }
            return true;
        },
        clearStack: function () {
            var self = this;
            self.filestack = [];
            self.filenames = [];
            self.fileids = [];
            return self.$element;
        },
        updateStack: function (i, file) {
            var self = this;
            self.filestack[i] = file;
            self.filenames[i] = self._getFileName(file);
            self.fileids[i] = file && self._getFileId(file) || null;
            return self.$element;
        },
        addToStack: function (file) {
            var self = this;
            self.filestack.push(file);
            self.filenames.push(self._getFileName(file));
            self.fileids.push(self._getFileId(file));
            return self.$element;
        },
        getFileStack: function (skipNull) {
            var self = this;
            return self.filestack.filter(function (n) {
                return (skipNull ? n !== undefined : n !== undefined && n !== null);
            });
        },
        getFilesCount: function () {
            var self = this, len = self.isAjaxUpload ? self.getFileStack().length : self.$element.get(0).files.length;
            return self._getFileCount(len);
        },
        lock: function () {
            var self = this;
            self._resetErrors();
            self.disable();
            if (self.showRemove) {
                self.$container.find('.fileinput-remove').hide();
            }
            if (self.showCancel) {
                self.$container.find('.fileinput-cancel').show();
            }
            self._raise('filelock', [self.filestack, self._getExtraData()]);
            return self.$element;
        },
        unlock: function (reset) {
            var self = this;
            if (reset === undefined) {
                reset = true;
            }
            self.enable();
            if (self.showCancel) {
                self.$container.find('.fileinput-cancel').hide();
            }
            if (self.showRemove) {
                self.$container.find('.fileinput-remove').show();
            }
            if (reset) {
                self._resetFileStack();
            }
            self._raise('fileunlock', [self.filestack, self._getExtraData()]);
            return self.$element;
        },
        cancel: function () {
            var self = this, xhr = self.ajaxRequests, len = xhr.length, i;
            if (len > 0) {
                for (i = 0; i < len; i += 1) {
                    self.cancelling = true;
                    xhr[i].abort();
                }
            }
            self._setProgressCancelled();
            self._getThumbs().each(function () {
                var $thumb = $(this), ind = $thumb.attr('data-fileindex');
                $thumb.removeClass('file-uploading');
                if (self.filestack[ind] !== undefined) {
                    $thumb.find('.kv-file-upload').removeClass('disabled').removeAttr('disabled');
                    $thumb.find('.kv-file-remove').removeClass('disabled').removeAttr('disabled');
                }
                self.unlock();
            });
            return self.$element;
        },
        clear: function () {
            var self = this, cap;
            if (!self._raise('fileclear')) {
                return;
            }
            self.$btnUpload.removeAttr('disabled');
            self._getThumbs().find('video,audio,img').each(function () {
                $h.cleanMemory($(this));
            });
            self._resetUpload();
            self.clearStack();
            self._clearFileInput();
            self._resetErrors(true);
            if (self._hasInitialPreview()) {
                self._showFileIcon();
                self._resetPreview();
                self._initPreviewActions();
                self.$container.removeClass('file-input-new');
            } else {
                self._getThumbs().each(function () {
                    self._clearObjects($(this));
                });
                if (self.isAjaxUpload) {
                    self.previewCache.data = {};
                }
                self.$preview.html('');
                cap = (!self.overwriteInitial && self.initialCaption.length > 0) ? self.initialCaption : '';
                self.$caption.attr('title', '').val(cap);
                $h.addCss(self.$container, 'file-input-new');
                self._validateDefaultPreview();
            }
            if (self.$container.find($h.FRAMES).length === 0) {
                if (!self._initCaption()) {
                    self.$captionContainer.removeClass('icon-visible');
                }
            }
            self._hideFileIcon();
            self._raise('filecleared');
            self.$captionContainer.focus();
            self._setFileDropZoneTitle();
            return self.$element;
        },
        reset: function () {
            var self = this;
            if (!self._raise('filereset')) {
                return;
            }
            self._resetPreview();
            self.$container.find('.fileinput-filename').text('');
            $h.addCss(self.$container, 'file-input-new');
            if (self.getFrames().length || self.isAjaxUpload && self.dropZoneEnabled) {
                self.$container.removeClass('file-input-new');
            }
            self.clearStack();
            self.formdata = {};
            self._setFileDropZoneTitle();
            return self.$element;
        },
        disable: function () {
            var self = this;
            self.isDisabled = true;
            self._raise('filedisabled');
            self.$element.attr('disabled', 'disabled');
            self.$container.find(".kv-fileinput-caption").addClass("file-caption-disabled");
            self.$container.find(".fileinput-remove, .fileinput-upload, .file-preview-frame button")
                .attr("disabled", true);
            $h.addCss(self.$container.find('.btn-file'), 'disabled');
            self._initDragDrop();
            return self.$element;
        },
        enable: function () {
            var self = this;
            self.isDisabled = false;
            self._raise('fileenabled');
            self.$element.removeAttr('disabled');
            self.$container.find(".kv-fileinput-caption").removeClass("file-caption-disabled");
            self.$container.find(".fileinput-remove, .fileinput-upload, .file-preview-frame button")
                .removeAttr("disabled");
            self.$container.find('.btn-file').removeClass('disabled');
            self._initDragDrop();
            return self.$element;
        },
        upload: function () {
            var self = this, totLen = self.getFileStack().length, i, outData, len,
                hasExtraData = !$.isEmptyObject(self._getExtraData());
            if (!self.isAjaxUpload || self.isDisabled || !self._isFileSelectionValid(totLen)) {
                return;
            }
            self._resetUpload();
            if (totLen === 0 && !hasExtraData) {
                self._showUploadError(self.msgUploadEmpty);
                return;
            }
            self.$progress.show();
            self.uploadCount = 0;
            self.uploadStatus = {};
            self.uploadLog = [];
            self.lock();
            self._setProgress(2);
            if (totLen === 0 && hasExtraData) {
                self._uploadExtraOnly();
                return;
            }
            len = self.filestack.length;
            self.hasInitData = false;
            if (self.uploadAsync) {
                outData = self._getOutData();
                self._raise('filebatchpreupload', [outData]);
                self.fileBatchCompleted = false;
                self.uploadCache = {content: [], config: [], tags: [], append: true};
                self.uploadAsyncCount = self.getFileStack().length;
                for (i = 0; i < len; i++) {
                    self.uploadCache.content[i] = null;
                    self.uploadCache.config[i] = null;
                    self.uploadCache.tags[i] = null;
                }
                self.$preview.find('.file-preview-initial').removeClass($h.SORT_CSS);
                self._initSortable();
                self.cacheInitialPreview = self.getPreview();

                for (i = 0; i < len; i++) {
                    if (self.filestack[i]) {
                        self._uploadSingle(i, true);
                    }
                }
                return;
            }
            self._uploadBatch();
            return self.$element;
        },
        destroy: function () {
            var self = this, $form = self.$form, $cont = self.$container, $el = self.$element, ns = self.namespace;
            $(document).off(ns);
            $(window).off(ns);
            if ($form && $form.length) {
                $form.off(ns);
            }
            if (self.isAjaxUpload) {
                self._clearFileInput();
            }
            self._cleanup();
            self._initPreviewCache();
            $el.insertBefore($cont).off(ns).removeData();
            $cont.off().remove();
            return $el;
        },
        refresh: function (options, triggerChange) {
            var self = this, $el = self.$element;
            if (typeof options !== 'object' || $h.isEmpty(options)) {
                options = self.options;
            } else {
                options = $.extend(true, {}, self.options, options);
            }
            self._init(options, true);
            self._listen();
            if (triggerChange) {
                $el.trigger('change' + self.namespace);
            }
            return $el;
        },
        zoom: function (frameId) {
            var self = this, $frame = self._getFrame(frameId), $modal = self.$modal;
            if (!$frame) {
                return;
            }
            $h.initModal($modal);
            $modal.html(self._getModalContent());
            self._setZoomContent($frame);
            $modal.modal('show');
            self._initZoomButtons();
        },
        getExif: function (frameId) {
            var self = this, $frame = self._getFrame(frameId);
            return $frame && $frame.data('exif') || null;
        },
        getFrames: function (cssFilter) {
            var self = this;
            cssFilter = cssFilter || '';
            return self.$preview.find($h.FRAMES + cssFilter);
        },
        getPreview: function () {
            var self = this;
            return {
                content: self.initialPreview,
                config: self.initialPreviewConfig,
                tags: self.initialPreviewThumbTags
            };
        }
    };

    $.fn.fileinput = function (option) {
        if (!$h.hasFileAPISupport() && !$h.isIE(9)) {
            return;
        }
        var args = Array.apply(null, arguments), retvals = [];
        args.shift();
        this.each(function () {
            var self = $(this), data = self.data('fileinput'), options = typeof option === 'object' && option,
                theme = options.theme || self.data('theme'), l = {}, t = {},
                lang = options.language || self.data('language') || $.fn.fileinput.defaults.language || 'en', opt;
            if (!data) {
                if (theme) {
                    t = $.fn.fileinputThemes[theme] || {};
                }
                if (lang !== 'en' && !$h.isEmpty($.fn.fileinputLocales[lang])) {
                    l = $.fn.fileinputLocales[lang] || {};
                }
                opt = $.extend(true, {}, $.fn.fileinput.defaults, t, $.fn.fileinputLocales.en, l, options, self.data());
                data = new FileInput(this, opt);
                self.data('fileinput', data);
            }

            if (typeof option === 'string') {
                retvals.push(data[option].apply(data, args));
            }
        });
        switch (retvals.length) {
            case 0:
                return this;
            case 1:
                return retvals[0];
            default:
                return retvals;
        }
    };

    $.fn.fileinput.defaults = {
        language: 'en',
        showCaption: true,
        showBrowse: true,
        showPreview: true,
        showRemove: true,
        showUpload: true,
        showCancel: true,
        showClose: true,
        showUploadedThumbs: true,
        browseOnZoneClick: false,
        autoReplace: false,
        autoOrientImage: true, // for JPEG images based on EXIF orientation tag
        required: false,
        rtl: false,
        hideThumbnailContent: false,
        generateFileId: null,
        previewClass: '',
        captionClass: '',
        frameClass: 'krajee-default',
        mainClass: 'file-caption-main',
        mainTemplate: null,
        purifyHtml: true,
        fileSizeGetter: null,
        initialCaption: '',
        initialPreview: [],
        initialPreviewDelimiter: '*$$*',
        initialPreviewAsData: false,
        initialPreviewFileType: 'image',
        initialPreviewConfig: [],
        initialPreviewThumbTags: [],
        previewThumbTags: {},
        initialPreviewShowDelete: true,
        initialPreviewDownloadUrl: '',
        removeFromPreviewOnError: false,
        deleteUrl: '',
        deleteExtraData: {},
        overwriteInitial: true,
        previewZoomButtonIcons: {
            prev: '<i class="glyphicon glyphicon-triangle-left"></i>',
            next: '<i class="glyphicon glyphicon-triangle-right"></i>',
            toggleheader: '<i class="glyphicon glyphicon-resize-vertical"></i>',
            fullscreen: '<i class="glyphicon glyphicon-fullscreen"></i>',
            borderless: '<i class="glyphicon glyphicon-resize-full"></i>',
            close: '<i class="glyphicon glyphicon-remove"></i>'
        },
        previewZoomButtonClasses: {
            prev: 'btn btn-navigate',
            next: 'btn btn-navigate',
            toggleheader: 'btn btn-kv btn-default btn-outline-secondary',
            fullscreen: 'btn btn-kv btn-default btn-outline-secondary',
            borderless: 'btn btn-kv btn-default btn-outline-secondary',
            close: 'btn btn-kv btn-default btn-outline-secondary'
        },
        preferIconicPreview: false,
        preferIconicZoomPreview: false,
        allowedPreviewTypes: undefined,
        allowedPreviewMimeTypes: null,
        allowedFileTypes: null,
        allowedFileExtensions: null,
        defaultPreviewContent: null,
        customLayoutTags: {},
        customPreviewTags: {},
        previewFileIcon: '<i class="glyphicon glyphicon-file"></i>',
        previewFileIconClass: 'file-other-icon',
        previewFileIconSettings: {},
        previewFileExtSettings: {},
        buttonLabelClass: 'hidden-xs',
        browseIcon: '<i class="glyphicon glyphicon-folder-open"></i>&nbsp;',
        browseClass: 'btn btn-primary',
        removeIcon: '<i class="glyphicon glyphicon-trash"></i>',
        removeClass: 'btn btn-default btn-secondary',
        cancelIcon: '<i class="glyphicon glyphicon-ban-circle"></i>',
        cancelClass: 'btn btn-default btn-secondary',
        uploadIcon: '<i class="glyphicon glyphicon-upload"></i>',
        uploadClass: 'btn btn-default btn-secondary',
        uploadUrl: null,
        uploadUrlThumb: null,
        uploadAsync: true,
        uploadExtraData: {},
        zoomModalHeight: 480,
        minImageWidth: null,
        minImageHeight: null,
        maxImageWidth: null,
        maxImageHeight: null,
        resizeImage: false,
        resizePreference: 'width',
        resizeQuality: 0.92,
        resizeDefaultImageType: 'image/jpeg',
        resizeIfSizeMoreThan: 0, // in KB
        minFileSize: 0,
        maxFileSize: 0,
        maxFilePreviewSize: 25600, // 25 MB
        minFileCount: 0,
        maxFileCount: 0,
        validateInitialCount: false,
        msgValidationErrorClass: 'text-danger',
        msgValidationErrorIcon: '<i class="glyphicon glyphicon-exclamation-sign"></i> ',
        msgErrorClass: 'file-error-message',
        progressThumbClass: "progress-bar bg-success progress-bar-success progress-bar-striped active",
        progressClass: "progress-bar bg-success progress-bar-success progress-bar-striped active",
        progressCompleteClass: "progress-bar bg-success progress-bar-success",
        progressErrorClass: "progress-bar bg-danger progress-bar-danger",
        progressUploadThreshold: 99,
        previewFileType: 'image',
        elCaptionContainer: null,
        elCaptionText: null,
        elPreviewContainer: null,
        elPreviewImage: null,
        elPreviewStatus: null,
        elErrorContainer: null,
        errorCloseButton: '<button type="button" class="close kv-error-close">&times;</button>',
        slugCallback: null,
        dropZoneEnabled: true,
        dropZoneTitleClass: 'file-drop-zone-title',
        fileActionSettings: {},
        otherActionButtons: '',
        textEncoding: 'UTF-8',
        ajaxSettings: {},
        ajaxDeleteSettings: {},
        showAjaxErrorDetails: true,
        mergeAjaxCallbacks: false,
        mergeAjaxDeleteCallbacks: false,
        retryErrorUploads: true
    };

    $.fn.fileinputLocales.en = {
        fileSingle: 'file',
        filePlural: 'files',
        browseLabel: 'Browse &hellip;',
        removeLabel: 'Remove',
        removeTitle: 'Clear selected files',
        cancelLabel: 'Cancel',
        cancelTitle: 'Abort ongoing upload',
        uploadLabel: 'Upload',
        uploadTitle: 'Upload selected files',
        msgNo: 'No',
        msgNoFilesSelected: 'No files selected',
        msgCancelled: 'Cancelled',
        msgPlaceholder: 'Select {files}...',
        msgZoomModalHeading: 'Detailed Preview',
        msgFileRequired: 'You must select a file to upload.',
        msgSizeTooSmall: 'File "{name}" (<b>{size} KB</b>) is too small and must be larger than <b>{minSize} KB</b>.',
        msgSizeTooLarge: 'File "{name}" (<b>{size} KB</b>) exceeds maximum allowed upload size of <b>{maxSize} KB</b>.',
        msgFilesTooLess: 'You must select at least <b>{n}</b> {files} to upload.',
        msgFilesTooMany: 'Number of files selected for upload <b>({n})</b> exceeds maximum allowed limit of <b>{m}</b>.',
        msgFileNotFound: 'File "{name}" not found!',
        msgFileSecured: 'Security restrictions prevent reading the file "{name}".',
        msgFileNotReadable: 'File "{name}" is not readable.',
        msgFilePreviewAborted: 'File preview aborted for "{name}".',
        msgFilePreviewError: 'An error occurred while reading the file "{name}".',
        msgInvalidFileName: 'Invalid or unsupported characters in file name "{name}".',
        msgInvalidFileType: 'Invalid type for file "{name}". Only "{types}" files are supported.',
        msgInvalidFileExtension: 'Invalid extension for file "{name}". Only "{extensions}" files are supported.',
        msgFileTypes: {
            'image': 'image',
            'html': 'HTML',
            'text': 'text',
            'video': 'video',
            'audio': 'audio',
            'flash': 'flash',
            'pdf': 'PDF',
            'object': 'object'
        },
        msgUploadAborted: 'The file upload was aborted',
        msgUploadThreshold: 'Processing...',
        msgUploadBegin: 'Initializing...',
        msgUploadEnd: 'Done',
        msgUploadEmpty: 'No valid data available for upload.',
        msgUploadError: 'Error',
        msgValidationError: 'Validation Error',
        msgLoading: 'Loading file {index} of {files} &hellip;',
        msgProgress: 'Loading file {index} of {files} - {name} - {percent}% completed.',
        msgSelected: '{n} {files} selected',
        msgFoldersNotAllowed: 'Drag & drop files only! {n} folder(s) dropped were skipped.',
        msgImageWidthSmall: 'Width of image file "{name}" must be at least {size} px.',
        msgImageHeightSmall: 'Height of image file "{name}" must be at least {size} px.',
        msgImageWidthLarge: 'Width of image file "{name}" cannot exceed {size} px.',
        msgImageHeightLarge: 'Height of image file "{name}" cannot exceed {size} px.',
        msgImageResizeError: 'Could not get the image dimensions to resize.',
        msgImageResizeException: 'Error while resizing the image.<pre>{errors}</pre>',
        msgAjaxError: 'Something went wrong with the {operation} operation. Please try again later!',
        msgAjaxProgressError: '{operation} failed',
        ajaxOperations: {
            deleteThumb: 'file delete',
            uploadThumb: 'file upload',
            uploadBatch: 'batch file upload',
            uploadExtra: 'form data upload'
        },
        dropZoneTitle: 'Drag & drop files here &hellip;',
        dropZoneClickTitle: '<br>(or click to select {files})',
        previewZoomButtonTitles: {
            prev: 'View previous file',
            next: 'View next file',
            toggleheader: 'Toggle header',
            fullscreen: 'Toggle full screen',
            borderless: 'Toggle borderless mode',
            close: 'Close detailed preview'
        }
    };

    $.fn.fileinput.Constructor = FileInput;

    /**
     * Convert automatically file inputs with class 'file' into a bootstrap fileinput control.
     */
    $(document).ready(function () {
        var $input = $('input.file[type=file]');
        if ($input.length) {
            $input.fileinput();
        }
    });
}));