Flex 監聽 變量與屬性

監聽變量變化

<?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"

creationComplete="application1_creationCompleteHandler(event)">

<fx:Script>

<![CDATA[

import mx.binding.utils.ChangeWatcher;

import mx.controls.Alert;

import mx.events.FlexEvent;

[Bindable]

public var aaa:String="123";

protected function application1_creationCompleteHandler(event:FlexEvent):void

{

ChangeWatcher.watch(this,"aaa",nnnn);

aaa="789";

}

public function nnnn(event:Event):void

{

Alert.show(aaa);

}

]]>

</fx:Script>

</s:Application>

----------------------------------------------------------------------------------------

監聽控件屬性變化

<?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"  

creationComplete="application1_creationCompleteHandler(event)">

<fx:Script>

<![CDATA[

import mx.binding.utils.ChangeWatcher;

import mx.controls.Alert;

import mx.events.FlexEvent;

protected function application1_creationCompleteHandler(event:FlexEvent):void

{

ChangeWatcher.watch(personName,"text",nnnn);

}

public function nnnn(event:Event):void

{

Alert.show(personName.text);

}

]]>

</fx:Script>

<s:TextInput id="personName" text="123"></s:TextInput>

</s:Application>