动态显示/隐藏 DataGrid 的列。

 在List中选中一个就会显示相应的 DataGrid 的列

 

<? xml version="1.0" encoding="utf-8" ?>
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"  layout ="horizontal"  horizontalAlign ="left"
    creationComplete ="initApp()" >
< mx:Script > <![CDATA[
  import mx.controls.dataGridClasses.DataGridColumn;
  //import mx.controls.DataGrid;
  import mx.collections.XMLListCollection;
  
  [Bindable]
private var _xlcCatalog:XMLListCollection;    //the dataProvider for the DG

//run by creationComplete
public function initApp():void
{
    _xlcCatalog = new XMLListCollection(xmlCatalog.product);      //wrap the XML product nodes in an XMLListCollection
    lstColumns.selectedItems = new Array(dgHideShow.columns[0]);  //set the column list dataProvider to the DataGridColumns
}//initApp

private function hideShowColumns():void  {
   var aColumns:Array = dgHideShow.columns;
   var aSelectedColumns:Array = lstColumns.selectedItems;
   var dgc:DataGridColumn;
   var sDataField:String;
   var sDataFieldCur:String;
   var bFound:Boolean
   for (var i:int=0;i<aColumns.length;i++)  {
     bFound = false
     dgc = aColumns[i];
     sDataField = dgc.dataField;
     for (var j:int=0;j<aSelectedColumns.length;j++)  {
       sDataFieldCur = aSelectedColumns[j].dataField;
       if (sDataFieldCur == sDataField)  {
         bFound = true;
         break;
       }
     }//for (var j:
     if (bFound) {
       dgc.visible = true;
     }  
     else  {
       dgc.visible = false;
     }     
   }// for (var i:
}//

]]> </ mx:Script >    
   < mx:VBox >
     < mx:Label  text ="Multi-Select"   />
     < mx:Label  text ="Columns"   />
     < mx:List  id ="lstColumns"  dataProvider ="{dgHideShow.columns}"  
        labelField ="dataField"  
        allowMultipleSelection ="true"
        click ="hideShowColumns()"    />     
   </ mx:VBox >

   < mx:DataGrid  id ="dgHideShow"  dataProvider ="{_xlcCatalog}"  rowCount ="6"   >
     < mx:columns >
       < mx:Array >
         < mx:DataGridColumn  headerText ="Product"  dataField ="name"  visible ="true"   />
         < mx:DataGridColumn  headerText ="Description"  dataField ="description"  visible ="false"   />
         < mx:DataGridColumn  headerText ="Price"  dataField ="price"  visible ="false"   />
         < mx:DataGridColumn  headerText ="Series"  dataField ="series"  visible ="false"   />
         < mx:DataGridColumn  headerText ="Tri-Band"  dataField ="triband"  visible ="false"   />
         < mx:DataGridColumn  headerText ="Camera"  dataField ="camera"  visible ="false"   />
        </ mx:Array >
     </ mx:columns >     
   </ mx:DataGrid >

   < mx:XML  id ="xmlCatalog" >
     < catalog >
       < product  productId ="1" >
         < name > Nokia 6010 </ name >
         < description > Easy to use without sacrificing style, the Nokia 6010 phone offers functional voice communication supported by text messaging, multimedia messaging, mobile internet, games and more </ description >
         < price > 99.99 </ price >
         < image > assets/pic/Nokia_6010.gif </ image >
         < series > 6000 </ series >
         < triband > false </ triband >
         < camera > false </ camera >
         < video > false </ video >
         < highlight1 > MMS </ highlight1 >
       < highlight2 > Large color display </ highlight2 >
       </ product >
       < product  productId ="2" >
         < name > Nokia 3100 Blue </ name >
         < description > Light up the night with a glow-in-the-dark cover - when it's charged with light you can easily find your phone in the dark. When you get a call, the Nokia 3100 phone flashes in tune with your ringing tone. And when you snap on a Nokia Xpress-on™ gaming cover*, you'll get luminescent light effects in time to the gaming action. </ description >
         < price > 139 </ price >
         < image > assets/pic/Nokia_3100_blue.gif </ image >
         < series > 3000 </ series >
         < triband > true </ triband >
         < camera > false </ camera >
         < video > false </ video >
         < highlight1 > Glow-in-the-dark </ highlight1 >
       < highlight2 > Flashing lights </ highlight2 >
       </ product >
       < product  productId ="3" >
         < name > Nokia 3100 Pink </ name >
         < description > Light up the night with a glow-in-the-dark cover - when it's charged with light you can easily find your phone in the dark. When you get a call, the Nokia 3100 phone flashes in tune with your ringing tone. And when you snap on a Nokia Xpress-on™ gaming cover*, you'll get luminescent light effects in time to the gaming action. </ description >
         < price > 139 </ price >
         < image > assets/pic/Nokia_3100_pink.gif </ image >
         < series > 3000 </ series >
         < triband > true </ triband >
         < camera > false </ camera >
         < video > false </ video >
         < highlight1 > Glow-in-the-dark </ highlight1 >
       < highlight2 > Flashing lights </ highlight2 >
       </ product >
       < product  productId ="4" >
         < name > Nokia 3120 </ name >
         < description > Designed for both business and pleasure, the elegant Nokia 3120 phone offers a pleasing mix of features. Enclosed within its chic, compact body, you will discover the benefits of tri-band compatibility, a color screen, MMS, XHTML browsing, cheerful screensavers, and much more. </ description >
         < price > 159.99 </ price >
         < image > assets/pic/Nokia_3120.gif </ image >
         < series > 3000 </ series >
         < triband > true </ triband >
         < camera > false </ camera >
         < video > false </ video >
         < highlight1 > Multimedia messaging </ highlight1 >
       < highlight2 > Animated screensavers </ highlight2 >
       </ product >
       < product  productId ="5" >
         < name > Nokia 3220 </ name >
         < description > The Nokia 3220 phone is a fresh new cut on some familiar ideas - animate your MMS messages with cute characters, see the music with lights that flash in time with your ringing tone, download wallpapers and screensavers with matching color schemes for the interface. </ description >
         < price > 159.99 </ price >
         < image > assets/pic/Nokia_3220.gif </ image >
         < series > 3000 </ series >
         < triband > false </ triband >
         < camera > true </ camera >
         < video > false </ video >
         < highlight1 > MIDI tones </ highlight1 >
       < highlight2 > Cut-out covers </ highlight2 >
       </ product >
     </ catalog >
   </ mx:XML >
</ mx:Application >