Flex 使用ArrayCollection的FilterFunction进行数据过滤

<? xml version="1.0" encoding="utf-8" ?>
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"  
    layout ="absolute"  fontFamily ="simsun"  fontSize ="12"
     creationComplete ="hs.send()" >
     < mx:Script >
         <![CDATA[
            import mx.collections.ArrayCollection;
            import mx.rpc.events.*;
            import mx.controls.Alert;
            
            private function hsFault(event:FaultEvent):void{
                Alert.show(event.message.toString(),"Error");
            }
            private function hsResult(event:ResultEvent):void{
                
                mydata = event.result.NewDataSet.Table as ArrayCollection;
                mydata.filterFunction = NameFilterChanged;
                mydata.refresh();
            }
            public function NameFilterChanged(item:Object):Boolean{
                var name:String = item.姓名;
                var sno:String = item.学号;
                var sex:String = item.性别;
                if(cmbSex.selectedItem.data != "全部")
                    return (sno.indexOf(txtSNO.text,0) >= 0) &&(name.indexOf(txtName.text,0) >= 0) && (cmbSex.selectedItem.data == sex);
                else
                    return (sno.indexOf(txtSNO.text,0) >= 0) &&(name.indexOf(txtName.text,0) >= 0);
            }
            
            [Bindable]
            private    var mydata:ArrayCollection;

            
         ]]>
     </ mx:Script >
     < mx:HTTPService  id ="hs"  useProxy ="false"  url ="绿色通道名单.xml"  fault ="hsFault(event)"
     showBusyCursor ="true"  result ="hsResult(event)" />
     < mx:DataGrid  dataProvider ="{mydata}"  right ="10"  left ="9"  top ="38"  bottom ="20"   >
         < mx:columns >
             < mx:DataGridColumn  headerText ="姓名"  dataField ="姓名" />
             < mx:DataGridColumn  headerText ="性别"  dataField ="性别" />
             < mx:DataGridColumn  headerText ="学号"  dataField ="学号" />
             < mx:DataGridColumn  headerText ="准考证号"  dataField ="准考证号" />
             < mx:DataGridColumn  headerText ="生源地"  dataField ="生源地" />
             < mx:DataGridColumn  headerText ="身份"  dataField ="身份" />
             < mx:DataGridColumn  headerText ="户口"  dataField ="户口" />
             < mx:DataGridColumn  headerText ="部门"  dataField ="部门" />
             < mx:DataGridColumn  headerText ="原因"  dataField ="原因" />
             < mx:DataGridColumn  headerText ="财务处是否办理"  dataField ="财务处是否办理" />
         </ mx:columns >
     </ mx:DataGrid >
     < mx:Label  x ="186"  y ="12"  text ="姓名:" />
     < mx:TextInput  id ="txtName"  x ="229"  y ="10"  change ="{mydata.refresh()}"  width ="95" />
     < mx:ComboBox  x ="391"  y ="10"  width ="94"  id ="cmbSex"  labelField ="title"  change ="mydata.refresh()" >  
         < mx:dataProvider >
             < mx:Array >
                 < mx:Object  title  = "全部"  data ="全部" />
                 < mx:Object  title  = "男"  data ="男" />
                 < mx:Object  title  = "女"  data ="女" />
             </ mx:Array >
         </ mx:dataProvider >
     </ mx:ComboBox >
     < mx:Label  x ="348"  y ="12"  text ="性别:" />
     < mx:TextInput  x ="76"  y ="10"  width ="102"  id ="txtSNO"  change ="{mydata.refresh()}" />
     < mx:Label  x ="33"  y ="12"  text ="学号:" />
</ mx:Application >