Flex : How to have tooltip on every Row of DataGrid-优快云博客

本文介绍如何在DatGrid中通过启用DataTips属性来显示鼠标悬停时的特定行数据，并提供了实现示例。

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If you have a DatGrid and you want to display row specific data on mouseOver, here is how this can be done.

The first step is to enable showDataTips property for every DataGridColumn that you want to enable this functionality on.
Secondly, you need to have a dataTipFunction function on the DatGrid itself. Because dataTipFunction passes over the Grid row data as an Object to the calling function, you dont need to pass any arguments to it. Here is a little example that shows how to do it.

 
   01<?xml version="1.0" encoding="utf-8"?> 
 
   02<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="doInit();"> 
 
   03<mx:Script> 
 
   04<!![CDATA[import mx.collections.ArrayCollection; // this holds the grid data 
 
   05[Bindable] 
 
   06private var myData:ArrayCollection = new ArrayCollection();private function doInit():void{ 
 
   07myData.addItem({fname:"Joe",lname:"Bloggs"}); 
 
   08myData.addItem({fname:"Joe1",lname:"Bloggs"}); 
 
   09} 
 
   10  
 
   11private function buildToolTip(item:Object):String{ 
 
   12var myString:String = ""; 
 
   13if(item != null) 
 
   14{ 
 
   15myString = myString + "Firstname : " + item.fname + "/n"; 
 
   16myString = myString + "Lastname : " + item.lname + "/n" 
 
   17} 
 
   18return myString; 
 
   19} 
 
   20]]> 
 
   21</mx:Script> 
 
   22<mx:DataGrid id="dGrid"  dataProvider="{myData}"  visible="true" dataTipFunction="buildToolTip"> 
 
   23<mx:columns> 
 
   24<mx:DataGridColumn dataField="fname" headerText="FirstName" showDataTips="true" /> 
 
   25<mx:DataGridColumn dataField="lname" headerText="LastName" showDataTips="true" /> 
 
   26</mx:columns> 
 
   27</mx:DataGrid> 
 
   28</mx:Application>