/* jshint forin:true, noarg:true, noempty:true, eqeqeq:true, boss:true, undef:true, curly:true, browser:true, jquery:true */
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/*
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* jQuery MultiSelect UI Widget Filtering Plugin 1.5pre
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* Copyright (c) 2012 Eric Hynds
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*
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* http://www.erichynds.com/jquery/jquery-ui-multiselect-widget/
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*
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* Depends:
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* - jQuery UI MultiSelect widget
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*
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* Dual licensed under the MIT and GPL licenses:
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* http://www.opensource.org/licenses/mit-license.php
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* http://www.gnu.org/licenses/gpl.html
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*
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*/
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(function($) {
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var rEscape = /[\-\[\]{}()*+?.,\\\^$|#\s]/g;
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$.widget('ech.multiselectfilter', {
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options: {
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label: 'Filter:',
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width: null, /* override default width set in css file (px). null will inherit */
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placeholder: 'Enter keywords',
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autoReset: false
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},
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_create: function() {
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var opts = this.options;
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var elem = $(this.element);
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// get the multiselect instance
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var instance = (this.instance = (elem.data('echMultiselect') || elem.data("multiselect")));
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// store header; add filter class so the close/check all/uncheck all links can be positioned correctly
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var header = (this.header = instance.menu.find('.ui-multiselect-header').addClass('ui-multiselect-hasfilter'));
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// wrapper elem
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var wrapper = (this.wrapper = $('<div class="ui-multiselect-filter">' + (opts.label.length ? opts.label : '') + '<input placeholder="'+opts.placeholder+'" type="search"' + (/\d/.test(opts.width) ? 'style="width:'+opts.width+'px"' : '') + ' /></div>').prependTo(this.header));
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// reference to the actual inputs
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this.inputs = instance.menu.find('input[type="checkbox"], input[type="radio"]');
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// build the input box
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this.input = wrapper.find('input').bind({
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keydown: function(e) {
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// prevent the enter key from submitting the form / closing the widget
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if(e.which === 13) {
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e.preventDefault();
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}
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},
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keyup: $.proxy(this._handler, this),
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click: $.proxy(this._handler, this)
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});
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// cache input values for searching
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this.updateCache();
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// rewrite internal _toggleChecked fn so that when checkAll/uncheckAll is fired,
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// only the currently filtered elements are checked
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instance._toggleChecked = function(flag, group) {
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var $inputs = (group && group.length) ? group : this.labels.find('input');
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var _self = this;
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// do not include hidden elems if the menu isn't open.
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var selector = instance._isOpen ? ':disabled, :hidden' : ':disabled';
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$inputs = $inputs
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.not(selector)
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.each(this._toggleState('checked', flag));
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// update text
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this.update();
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// gather an array of the values that actually changed
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var values = $inputs.map(function() {
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return this.value;
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}).get();
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// select option tags
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this.element.find('option').filter(function() {
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if(!this.disabled && $.inArray(this.value, values) > -1) {
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_self._toggleState('selected', flag).call(this);
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}
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});
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// trigger the change event on the select
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if($inputs.length) {
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this.element.trigger('change');
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}
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};
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// rebuild cache when multiselect is updated
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var doc = $(document).bind('multiselectrefresh', $.proxy(function() {
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this.updateCache();
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this._handler();
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}, this));
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// automatically reset the widget on close?
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if(this.options.autoReset) {
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doc.bind('multiselectclose', $.proxy(this._reset, this));
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}
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},
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// thx for the logic here ben alman
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_handler: function(e) {
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var term = $.trim(this.input[0].value.toLowerCase()),
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// speed up lookups
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rows = this.rows, inputs = this.inputs, cache = this.cache;
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if(!term) {
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rows.show();
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} else {
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rows.hide();
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var regex = new RegExp(term.replace(rEscape, "\\$&"), 'gi');
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this._trigger("filter", e, $.map(cache, function(v, i) {
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if(v.search(regex) !== -1) {
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rows.eq(i).show();
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return inputs.get(i);
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}
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return null;
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}));
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}
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// show/hide optgroups
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this.instance.menu.find(".ui-multiselect-optgroup-label").each(function() {
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var $this = $(this);
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var isVisible = $this.nextUntil('.ui-multiselect-optgroup-label').filter(function() {
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return $.css(this, "display") !== 'none';
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}).length;
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$this[isVisible ? 'show' : 'hide']();
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});
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},
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_reset: function() {
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this.input.val('').trigger('keyup');
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},
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updateCache: function() {
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// each list item
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this.rows = this.instance.menu.find(".ui-multiselect-checkboxes li:not(.ui-multiselect-optgroup-label)");
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// cache
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this.cache = this.element.children().map(function() {
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var elem = $(this);
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// account for optgroups
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if(this.tagName.toLowerCase() === "optgroup") {
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elem = elem.children();
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}
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return elem.map(function() {
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return this.innerHTML.toLowerCase();
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}).get();
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}).get();
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},
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widget: function() {
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return this.wrapper;
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},
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destroy: function() {
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$.Widget.prototype.destroy.call(this);
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this.input.val('').trigger("keyup");
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this.wrapper.remove();
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}
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});
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})(jQuery);
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