Tree加載時顯示所有節點

找了很久的資料，才解決tree加載時顯示所有節點這個問題，引自http://hi.baidu.com/lz0830/blog/item/7b406e82d7f41c98f703a632.html

該文中提出Tree的數據源在MXML文件中和數據源是從後臺程序獲取兩種情況：

一、針對第一種情況（tree的數據源在MXML文件中）的寫法：

private function initApp():void {
      for each(var item:XML in this.myTree.dataProvider)
           this.myTree.expandChildrenOf(item,true);
}

該函數的調用creationComplete="initApp()"

 

二、數據源從後臺程序獲取：

<!--  讀取xml文件給tree綁定數據源 -->
<mx:HTTPService id="tree_httpsrv" url="assets/data/treeview.xml"  result="setTree(event)" fault="faultOperation(event)"  resultFormat="xml" />

<!-- 讀取xml文件的處理  -->

[Bindable]
private var tree_xml:XML;

private function setTree(event:ResultEvent):void
{
       tree_xml = XML(event.result);
       var tree_data:XMLList = tree_xml.treeviewNode;
       myTree.dataProvider = tree_data;
       myTree.callLater(expandTree);
}

private function expandTree():void
{
       //expand all tree node
       myTree.expandChildrenOf(tree_xml,true);
}