带复选框且支持搜索功能的下拉列表6

// private    onLoad : function()    {        if (!this.hasFocus)        {            return;        }        if (this.store.getCount() > 0)        {            this.expand();            this.restrictHeight();            if (this.lastQuery == this.allQuery)            {                if (this.editable)                {                    this.el.dom.select();                }                if (!this.selectByValue(this.value, true))                {                    this.select(0, true);                }            }            else            {                this.selectNext();                if (this.typeAhead && this.lastKey != Ext.EventObject.BACKSPACE && this.lastKey != Ext.EventObject                        .DELETE)                {                    this.taTask.delay(this.typeAheadDelay);                }            }        }        else        {            this.onEmptyResults();        }    },    // private    onTypeAhead : function()    {                if (this.store.getCount() > 0)        {            var r = this.store.getAt(0);            var newValue = r.data[this.displayField];            var len = newValue.length;            var selStart = this.getRawValue().length;            if (selStart != len)            {                this.setRawValue(newValue);                this.selectText(selStart, newValue.length);            }        }    },