Admin/Js/plugins/nestable/jquery.nestable.js

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/*!
 * Nestable jQuery Plugin - Copyright (c) 2012 David Bushell - http://dbushell.com/
 * Dual-licensed under the BSD or MIT licenses
 */
;(function($, window, document, undefined)
{
    var hasTouch = 'ontouchstart' in document;

    /**
     * Detect CSS pointer-events property
     * events are normally disabled on the dragging element to avoid conflicts
     * https://github.com/ausi/Feature-detection-technique-for-pointer-events/blob/master/modernizr-pointerevents.js
     */
    var hasPointerEvents = (function()
    {
        var el    = document.createElement('div'),
            docEl = document.documentElement;
        if (!('pointerEvents' in el.style)) {
            return false;
        }
        el.style.pointerEvents = 'auto';
        el.style.pointerEvents = 'x';
        docEl.appendChild(el);
        var supports = window.getComputedStyle && window.getComputedStyle(el, '').pointerEvents === 'auto';
        docEl.removeChild(el);
        return !!supports;
    })();

    var defaults = {
        listNodeName    : 'ol',
        itemNodeName    : 'li',
        rootClass       : 'dd',
        listClass       : 'dd-list',
        itemClass       : 'dd-item',
        dragClass       : 'dd-dragel',
        handleClass     : 'dd-handle',
        collapsedClass  : 'dd-collapsed',
        placeClass      : 'dd-placeholder',
        noDragClass     : 'dd-nodrag',
        emptyClass      : 'dd-empty',
        expandBtnHTML   : '<button data-action="expand" type="button">展开</button>',
        collapseBtnHTML : '<button data-action="collapse" type="button">关闭</button>',
        group           : 0,
        maxDepth        : 5,
        threshold       : 20
    };

    function Plugin(element, options)
    {
        this.w  = $(document);
        this.el = $(element);
        this.options = $.extend({}, defaults, options);
        this.init();
    }

    Plugin.prototype = {

        init: function()
        {
            var list = this;