Multiple accordion

jquery-ui-multiple-accordion.js

/**
 * Multiple accordion
 * It extends jQuery UI Accordion 1.11.x (Copyright 2015 jQuery Foundation and other contributors)
 * Shamely created by Comandeer, released under MIT license
 */
(function($)
{
	var _create = $.ui.accordion.prototype._create
	,_toggle = $.ui.accordion.prototype._toggle;

	$.extend($.ui.accordion.prototype, {
		_create: function()
		{
			var options = this.options;

			if(options.multiple && !options.collapsible)
				options.collapsible = true;

			_create.call(this);

			var active = this.element.find('.ui-accordion-content').eq(options.active);

			this.shown = [];

			if(active.is(':visible'))
				this.shown.push(active[0]);
		}
		,_toggle: function(obj)
		{
			if(!this.options.multiple)
				return _toggle.call(this, obj);

			var active = this.element.find('.ui-accordion-content').eq(this.options.active)
			,prev = this.prevShow
			,toChange = obj.newPanel.length ? obj.newPanel : (prev.length ? prev : active)
			,i = this.shown.indexOf(toChange[0]);

			this.prevShow = this.prevHide = $([]);

			if(i !== -1)
			{
				obj.oldHeader = obj.newHeader;
				obj.oldPanel = toChange;

				obj.newPanel = obj.newHeader = $([]);

				this.shown.splice(i, 1);
			}
			else
			{
				obj.oldHeader = obj.oldPanel = $([]);

				this.shown.push(obj.newPanel[0]);
			}

			_toggle.call(this, obj);
		}
	});
}(jQuery));