带复选框且支持搜索功能的下拉列表2

// private    onRender : function(ct, position)    {        Ext.form.ComboBox.superclass.onRender.call(this, ct, position);        var disValue = "";        if (this.hiddenName)        {            this.hiddenField =                    this.el.insertSibling({tag:'input', type:'hidden', name: this.hiddenName, id: (this.hiddenId || this                            .hiddenName)}, 'before', true);            var hvalue = this.hiddenValue !== undefined ? this.hiddenValue : this.value !== undefined ? this.value : '';            var hvalueArray = hvalue.split(this.valueSeparator);            for (var i = 0; i < this.store.data.length; i++)            {                var r = this.store.getAt(i);                var newValue = r.data[this.displayField];                var v = r.data[this.valueField];                for (var j = 0; j < hvalueArray.length; j++)                {                    if (hvalueArray[j] == v)                    {                        disValue += newValue + this.displaySeparator;                    }                }            }            this.hiddenField.value =                    this.hiddenValue !== undefined ? this.hiddenValue : this.value !== undefined ? this.value : '';            this.el.dom.removeAttribute('name');        }        if (Ext.isGecko)        {            this.el.dom.setAttribute('autocomplete', 'off');        }        if (!this.lazyInit)        {            this.initList();        }        else        {            this.on('focus', this.initList, this, {single: true});        }        if (!this.editable)        {            this.editable = true;            this.setEditable(false);        }        this.setValue(disValue);    },