flex Tree 展开特定节点

@import url(http://www.blogjava.net/CuteSoft_Client/CuteEditor/Load.ashx?type=style&file=SyntaxHighlighter.css);@import url(/css/cuteeditor.css); @import url(http://www.blogjava.net/CuteSoft_Client/CuteEditor/Load.ashx?type=style&file=SyntaxHighlighter.css);@import url(/css/cuteeditor.css);

//验证并更新此对象的属性和布局

Tree.validateNow();

for each (var item:Object in Tree.dataProvider)

{

//打开或关闭指定项目下的所有树项目。如果设置 dataProvider 之后立即调用 expandChildrenOf()，则您可能看不到正确的行为。您应该等待对组件进行验证或调用 validateNow() 方法。

Tree.expandChildrenOf(item, true);}

第二种方式

1 <? xml version="1.0" encoding="utf-8" ?>
2 < s:Application xmlns:fx ="http://ns.adobe.com/mxml/2009"
3                xmlns:s ="library://ns.adobe.com/flex/spark"
4                xmlns:mx ="library://ns.adobe.com/flex/mx" minWidth ="955" minHeight ="600"
5                creationComplete ="onInit()" >
6      < fx:Declarations >
7          
8
9          < fx:XML id ="xml" xmlns ="" >
10              < node id ="#" label ="所有" >
11                  < node id ="101" label ="Name101" >
12                      < node id ="10101" label ="Name10101" />
13                      < node id ="10102" label ="Name10102" />
14                      < node id ="10103" label ="Name10103" />
15                  </ node >
16                  < node id ="102" label ="Name102" >
17                      < node id ="10201" label ="Name10201" />
18                      < node id ="10202" label ="Name10202" />
19                  </ node >
20                  < node id ="103" label ="Name103" >
21                      < node id ="10301" label ="Name10301" />
22                  </ node >
23              </ node >
24          </ fx:XML >
25      </ fx:Declarations >
26
27      < fx:Script >
28          <![CDATA[
29             private function onInit():void{
30                 tree.selectedIndex=0;
31                 tree.callLater(expand,null);
32             }
33             private function expand():void{
34                 tree.expandItem(tree.selectedItem,true);
35                 //这里可以随便指定展开的节点，如果超出默认展开最后一个根节点
36                 tree.selectedIndex=1;
37                 tree.expandItem(tree.selectedItem,true);
38             }
39          ]]>
40      </ fx:Script >
41      < mx:Tree id ="tree" x ="73" y ="36" width ="200" height ="217" dataProvider ="{xml}" labelField ="@label" ></ mx:Tree >
42 </ s:Application >
43

flex Tree 展开特定节点

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