flex 展开树的指定节点

思路: 要展开某个指定节点 ，须要从根节点一步步展开到指定节点：

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?package { import mx.controls.Tree; public class ExTree extends Tree { public function ExTree() { super(); } public function expandParents(node:XML):void { if (node && !isItemOpen(node)) { expandItem(node,true); expandParents(node.parent()); } } } }

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<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" xmlns:ns1="*"> <fx:Declarations> <!-- Place non-visual elements (e.g.,services,value objects) here --> </fx:Declarations> <fx:Script> <!--[CDATA[ import mx.events.FlexEvent; import mx.controls.Alert; [Bindable] private var ds :XML; protected function button1_clickHandler(event:MouseEvent):void { tree.expandParents(ds..*.(@name == "pan11")[0] as XML); } protected function tree_creationCompleteHandler(event:FlexEvent):void { ds = new XML('<root>'+ '<acct name="pan">' + '<acct name="pan1">' + '<acct name="pan11">' + '<acct name="pan111">' + '<acct name="pan1111">' + '<acct name="pan22222">' + '</acct>'+ '</acct>'+ '</acct>'+ '</acct>'+ '</acct>' + '</acct>' + '</root>' ); } ]]--> </fx:Script> <ns1:ExTree id="tree" dataProvider="{ds}" labelField="@name" showRoot="false" x="169" y="62" creationComplete="tree_creationCompleteHandler(event)" width="156" height="350"/> <s:Button label="selete12d" click="button1_clickHandler(event)" x="420" y="86"> </s:Button> </s:Application>

注：node.parent()方法是XML文档的方法，所以expandParents(node:XML）的参数node应该来源于xml本身的引用，而不是tree.dataProvider的引用

还有e4x查找也应该用于xml本身引用

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也可保存路径:

var parentArray:Array = new Array(); var obj:Object = currentSelectedTreeNode.parent; while( obj ) { try { obj = obj.parent; parentArray.push( obj ); } catch( e:Error ) { break; } }

http://www.flexdeveloper.eu/forums/flex-charting/tree-control-how-to-get-the-full-path-of-selecteditem-in-tree-control/