如何在没有数据显示时禁用分页属性？

Question

如何在没有数据显示时禁用分页属性？当将鼠标移动到非活动状态时（即，当没有数据存在时），网格具有页面导航文本存在于网格底部。分页文本。当鼠标移动完成时显示超链接。

       Adv.GridPagingBar = Ext.extend(Ext.PagingToolbar,
        {
        pageSize: 25,
        height:40,
        border:false,
        displayInfo: true,
        cls:'adv-pagination-bar',
        displayMsg: 'Showing items {0} - {1} of {2}',
        emptyMsg: "No items to display",
        initComponent: function() {
            this.items = [{
                xtype: 'tbseparator'
            }, {
                xtype: 'tbspacer'
            }, {
                xtype: 'tbspacer'
            }, {
                xtype: 'tbspacer'
            }];
            Adv.GridPagingBar.superclass.initComponent.call(this, arguments);
        }
});

后面跟各个属性如下;

      this.next = new Ext.Toolbar.Button({
        cls: 'adv-img-button',
        iconCls: 'adv-btn-icon',            
        text:this.nextText,
        tooltip: this.nextText,
        overCls:'skip-funding-hover',
        overflowText: this.nextText,           
        disabled: true,
        handler: this.moveNext,
        scope: this

    }), this.last = new Ext.Toolbar.Button({
        cls: 'adv-img-button',
        iconCls: 'adv-btn-icon',
        overCls:'skip-funding-hover',
        text:this.lastText,
        tooltip: this.lastText,
        overflowText: this.lastText,            
        disabled: true,
        handler: this.moveLast,
        scope: this
    })