数据筛选(转)

<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="init()" width="640" height="400">
<mx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import mx.controls.dataGridClasses.DataGridColumn;
import mx.controls.DataGrid;
   
    private var aryCol:ArrayCollection;
   
       var ac:Array=new Array({0:"Visa", 1:21 , 2:"0"},
                              {0:"MasterCard", 1:24 , 2:"1"},
                              {0:"American Express", 1:31 , 2:"2"});
    

                 
private var ad:ArrayCollection=new ArrayCollection(ac);

private function init():void
{
     dg.dataProvider=ad;    
             ad.filterFunction = filterFunc;
}

private function filterFunc(item:Object):Boolean   //item 指的就是数据源aryCollection
{
                var _cb:Boolean = (item["1"] == ageChoose.selectedItem.data) ? true : false;
                trace("item.1:   "+item["1"]);
return _cb;
}

private function filterCity(evt:Event):void
{
ad.refresh();
}

]]>
</mx:Script>
<mx:DataGrid id="dg" width="100%" height="100%" rowCount="5"  >
            <mx:columns>
                <mx:DataGridColumn dataField="0" headerText="name"/>
                <mx:DataGridColumn dataField="1" headerText="age"/>
                <mx:DataGridColumn dataField="2" headerText="sex"/>
            </mx:columns>
        </mx:DataGrid>

    <mx:ArrayCollection id="ageSelectAC">
<mx:Object label="21" data="21"/>
<mx:Object label="31" data="31"/>
<mx:Object label="24" data="24"/>
<mx:Object label="27" data="27"/>
</mx:ArrayCollection>
<mx:ComboBox id="ageChoose" width="100" dataProvider="{ageSelectAC}" change="filterCity(event)" x="134" y="339"/>


</mx:WindowedApplication>