Flex 动态绑定BindingUtils.bindProperty

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<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute" initialize="init();">

<mx:Script>
import mx.binding.utils.BindingUtils;
import mx.binding.utils.ChangeWatcher;

private var watcher1:ChangeWatcher;
private var watcher2:ChangeWatcher;

/**
* 动态绑定
* @return void
* **/
private function Binding():void {

//绑定ID为txt2的txtInput
//绑定属性为txtInput的text
//监视者ID为txt1的txtInput
//监视者属性为txtInput的text
watcher1 = BindingUtils.bindProperty(txt2,"text",txt1,"text");

//绑定ID为txtComb的txtInput
//绑定属性为txtInput的text
//监视者ID为comb的ComboBox
//监视者属性为ComboBox的value
watcher2 = BindingUtils.bindProperty(txtComb,"text",comb,"value");
}

/**
* 解除绑定
* @return void
* **/
private function UnBinding():void {
//解除绑定
watcher1.unwatch();
watcher2.unwatch();
}
</mx:Script>

<mx:ApplicationControlBar dock="true">
<mx:Button label="动态绑定" click="Binding();"/>
<mx:Button label="解除绑定" click="UnBinding();"/>
</mx:ApplicationControlBar>

<mx:VBox width="200" height="200">

<mx:Spacer height="30"/>

<mx:TextInput id="txt1"/>
<mx:TextInput id="txt2"/>

<mx:Spacer height="30"/>

<mx:ComboBox id="comb">
<mx:dataProvider>
<mx:Array>
<mx:String>Beijing</mx:String>
<mx:String>Shanghai</mx:String>
<mx:String>Hangzhou</mx:String>
</mx:Array>
</mx:dataProvider>
</mx:ComboBox>

<mx:TextInput id="txtComb"/>
</mx:VBox>
</mx:Application>