采用数据库为Flex Tree组件的提供数据-FlexTree组件

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FlexTree组件

Tree 数据格式以为：

</node>

</node>

Flash Builder 4 Tree组件，这是显示部分。

<s:Panel title="Flex Tree 显示例子"

width="75%" height="75%"

horizontalCenter="0" verticalCenter="0">

<s:VGroup left="10" right="10" top="10" bottom="10">

<s:Label width="100%" color="blue"

text="选择一个树节点."/>

<mx:HDividedBox width="100%" height="100%">

<mx:Tree id="myTree" width="50%" height="100%" labelField="@label"

showRoot="false" change="treeChanged(event);"/>

<s:TextArea height="100%" width="50%"

text="Selected Item: {selectedNode.@label}"/>

</mx:HDividedBox>

</s:VGroup>

</s:Panel>

“treeChanged”处理树节点被改变事件，目的显示节点内容

public function treeChanged(evt:Event):void {

selectedNode = Tree(evt.target).selectedItem as XML;

}

定义一个RemoteObject，目的远程调用Java对象。

<fx:Declarations>

<mx:RemoteObject id="srv" destination="echo2005T" result="onselectresult(event)" fault="onfault(event)"/>

</fx:Declarations>

“onselectresult”处理接收数据，并绑定Tree

private function onselectresult(event:ResultEvent):void{

var xmldocroot:XML=new XML(event.result);

myTree.dataProvider=xmldocroot.child("node");

}

应用程序启动时就要获取数据，所以加一个creationComplete事件处理RemoteObject远程调用Java对象，getAlbumElementToXml_V2是一个Java方法，返回org.w3c.dom.Document类，该类型可以转化为Flex 的XML 类型。

完整Flex2001.mxml

<?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" creationComplete="application1_creationCompleteHandler(event)">

<fx:Script>

<![CDATA[

import mx.controls.Alert;

import mx.events.FlexEvent;

import mx.rpc.events.FaultEvent;

import mx.rpc.events.ResultEvent;

[Bindable]

public var selectedNode:XML;

// Event handler for the Tree control change event.

public function treeChanged(evt:Event):void {

selectedNode = Tree(evt.target).selectedItem as XML;

}

//结果处理函数

private function onselectresult(event:ResultEvent):void{

var xmldocroot:XML=new XML(event.result);

myTree.dataProvider=xmldocroot.child("node");

}

//处理错误函数

private function onfault(event:FaultEvent):void{

Alert.show(event.fault.faultString, 'Error');

}

protected function application1_creationCompleteHandler(event:FlexEvent):void

{

// TODO Auto-generated method stub

srv.getAlbumElementToXml_V2();

}

]]>

</fx:Script>