带复选框且支持搜索功能的下拉列表10

// private
    onEmptyResults : function()
    {
        this.collapse();
    },

    /**
     * Returns true if the dropdown list is expanded, else false.
     */
    isExpanded : function()
    {
        return this.list && this.list.isVisible();
    },
    selectByValue : function(v, scrollIntoView)
    {
        if (v !== undefined && v !== null)
        {
            var r = this.findRecord(this.valueField || this.displayField, v);
            if (r)
            {
                this.select(this.store.indexOf(r), scrollIntoView);
                return true;
            }
        }
        return false;
    },
    select : function(index, scrollIntoView)
    {
        this.selectedIndex = index;
        this.view.select(index);
        if (scrollIntoView !== false)
        {
            var el = this.view.getNode(index);
            if (el)
            {
                this.innerList.scrollChildIntoView(el, false);
            }
        }
    },

    // private
    selectNext : function()
    {
        var ct = this.store.getCount();
        if (ct > 0)
        {
            if (this.selectedIndex == -1)
            {
                this.select(0);
            } else if (this.selectedIndex < ct - 1)
            {
                this.select(this.selectedIndex + 1);
            }
        }
    },

    // private
    selectPrev : function()
    {
        var ct = this.store.getCount();
        if (ct > 0)
        {
            if (this.selectedIndex == -1)
            {
                this.select(0);
            } else if (this.selectedIndex != 0)
            {
                this.select(this.selectedIndex - 1);
            }
        }
    },

    // private
    onKeyUp : function(e)
    {
    	
        if (this.editable !== false)
        {
            this.lastKey = e.getKey();
            this.dqTask.delay(this.queryDelay);
        }
    },

    // private
    validateBlur : function()
    {
        return !this.list || !this.list.isVisible();
    },

    // private
    initQuery : function()
    {
        this.doQuery(this.getRawValue());
    },

    // private
    doForce : function()
    {
        if (this.el.dom.value.length > 0)
        {
            this.el.dom.value = this.lastSelectionText === undefined ? '' : this.lastSelectionText;
            this.applyEmptyText();
        }
    },