Flex-DataGrid中添加记录行数列

    有些时候，我们需要在dataGrid中添加记录行数的列。如果你使用的dataProvider是Collection,可以使用labelFunction和getItemIndex实现。不过这种方法会使得显示的行数是动态的，它不会随着其他列的排序(sort)而变化，如果你非要这样实现，需要把行数作为dataProvider的一部分了。

 

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="" layout="absolute"
    creationComplete="initApp()">
<mx:Script><![CDATA[
  import mx.collections.ArrayCollection;
  import mx.controls.Alert;
 
  [Bindable]private var _acDP:ArrayCollection;
 
 public function initApp():void
 {
   var oItem:Object;
   _acDP = new ArrayCollection();
   oItem = {Album:"The Lost Chord", Artist:"The Moody Blues", Price:"15.99" };
   _acDP.addItem(oItem);
   oItem = {Album:"Meddle", Artist:"Pink Floyd", Price:"17.99" };
   _acDP.addItem(oItem);
   oItem = {Album:"Trespass", Artist:"Genesis", Price:"18.99" };
   _acDP.addItem(oItem);
 
 }//initApp


  private function lfRowNum(oItem:Object,iCol:int):String
  {
    var iIndex:int = _acDP.getItemIndex(oItem) + 1;
    return String(iIndex);
  }
 
]]></mx:Script>

<mx:VBox>
 <mx:DataGrid id="dgSource" dataProvider="{_acDP}"
     editable="true" >
    <mx:columns>
      <mx:Array>
        <mx:DataGridColumn headerText="Row#" labelFunction="lfRowNum"/>
        <mx:DataGridColumn headerText="Album" dataField="Album" />
        <mx:DataGridColumn headerText="Artist" dataField="Artist" />
        <mx:DataGridColumn headerText="Price" dataField="Price" />
       </mx:Array>
    </mx:columns>
  </mx:DataGrid>
</mx:VBox>
</mx:Application>

至于效果，你可以编译执行。