循环访问RadioButtonGroup中的各个子项的值

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<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/06/20/looping-over-radiobutton-controls-in-a-radiobuttongroup-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">

<mx:Script>
<![CDATA[
import mx.controls.Alert;

private function showAlert():void {
var arr:Array = [];
var rb:RadioButton;
var idx:int;
var len:int = radioGroup.numRadioButtons;

for (idx=0; idx<len; idx++) {
rb = radioGroup.getRadioButtonAt(idx);
arr.push("index:" + idx + ", label:" + rb.label);
}
Alert.show(arr.join("/n"), "getRadioButtonAt():");
}
]]>
</mx:Script>

<mx:ApplicationControlBar dock="true">
<mx:Button label="Click me" click="showAlert();" />
</mx:ApplicationControlBar>

<mx:RadioButtonGroup id="radioGroup" />

<mx:VBox>
<mx:RadioButton id="radioButton1" label="One" />
<mx:RadioButton id="radioButton2" label="Two" />
<mx:RadioButton id="radioButton3" label="Three" />
<mx:RadioButton id="radioButton4" label="Four" />
<mx:RadioButton id="radioButton5" label="Five" />
</mx:VBox>

</mx:Application>