EXTJS 4.2 实现 gridpanel 鼠标悬停单元格以提示信息的方式显示单元格内容。

     me.on(‘itemmouseenter‘, function (view, record, item, index, e, eOpts) {
            if (view.tip == null) {  //这块判断很重要，不能每次都创建个tooltip，要不显示会有问题。
                view.tip = Ext.create(‘Ext.tip.ToolTip‘, {
                    // The overall target element.
                    target: view.el,
                    // Each grid row causes its own separate show and hide.
                    delegate: view.itemSelector,
                    // Moving within the row should not hide the tip.
                    //  trackMouse: false,
                    // Render immediately so that tip.body can be referenced prior to the first show.
                    renderTo: Ext.getBody()

                });
            };
            var gridColums = view.getGridColumns();
            var column = gridColums[e.getTarget(view.cellSelector).cellIndex];
             view.el.clean();
             view.tip.update(record.data[column.dataIndex]);
                           
                
            
        });