Sencha Touch 2中如何在DataView中显示IndexBar

大家有没有注意到DataView中没有IndexBar这个组件的，但是list中确是有的。。。。。这个真的是非常的蛋疼，但是我们又惊奇的发现在list是继承自dataView的，因此，实际上我们是有办法将indexBar通过和list中一样的办法嵌套进dataView的。

首先我们来看一下效果：

通过indexBar字母的变换我们可以匹配不同的数据。

下面简单说下做法：

1.首先需要自定义一个indexBar

[javascript]
Ext.define('App.view.NewIndexBar', {
    extend: 'Ext.Component',
    alternateClassName: 'Ext.NewIndexBar',

    /**
     * @event index
     * Fires when an item in the index bar display has been tapped.
     * @param {Ext.dataview.IndexBar} this The IndexBar instance
     * @param {String} html The HTML inside the tapped node.
     * @param {Ext.dom.Element} target The node on the indexbar that has been tapped.
     */

    config: {
        baseCls: Ext.baseCSSPrefix + 'indexbar',

        /**
         * @cfg {String} direction
         * Layout direction, can be either 'vertical' or 'horizontal'
         * @accessor
         */
        direction: 'vertical',

        /**
         * @cfg {Array} letters
         * The letters to show on the index bar.
         * @accessor
         */
        letters: ['一', '二', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'],

        ui: 'alphabet',

        /**
         * @cfg {String} listPrefix
         * The prefix string to be appended at the beginning of the list.
         * E.g: useful to add a "#" prefix before numbers.
         * @accessor
         */
        listPrefix: null
    },

    // @private
    itemCls: Ext.baseCSSPrefix + '',

    updateDirection: function(newDirection, oldDirection) {
        alert("4");
        var baseCls = this.getBaseCls();

        this.element.replaceCls(baseCls + '-' + oldDirection, baseCls + '-' + newDirection);
    },

    getElementConfig: function() {
       alert("5");
        return {
            reference: 'wrapper',
            classList: ['x-centered', 'x-indexbar-wrapper'],
            children: [this.callParent()]
        };
    },

    updateLetters: function(letters) {
        alert("6");
        this.innerElement.setHtml('');

        if (letters) {
            var ln = letters.length,
                i;

            for (i = 0; i < ln; i++) {
                this.innerElement.createChild({
                    html: letters[i]
                });
            }
        }
    },

    updateListPrefix: function(listPrefix) {
        alert("7");
        if (listPrefix && listPrefix.length) {
            this.innerElement.createChild({
                html: listPrefix
            }, 0);
        }
    },

    // @private
    initialize: function() {
        this.callParent();

        this.innerElement.on({
            touchstart: this.onTouchStart,
            touchend: this.onTouchEnd,
            touchmove: this.onTouchMove,
            scope: this
        });
    },

    // @private
    onTouchStart: function(e, t) {
        alert("8");
        if(isExc)
        {
            e.stopPropagation();
            this.innerElement.addCls(this.getBaseCls() + '-pressed');//附加indexbar样式
            this.pageBox = this.innerElement.getPageBox();
    &nbs

补充：web前端 , JavaScript ,