select2/demo/extension/select2-select-all.js

(function(){$('body').delegate('select:has( + .select2):has(option[value="__select-all__"])',"select2:select",function(e){var data=e.params.data.id;if(data==='__select-all__'){$(this).find('option[value]').prop("selected","selected");$(this).find('option[value="__select-all__"]').prop('selected',false);$(this).trigger("change");}});})();