flex validator 之实时验证

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   要进行实时验证，需要监听被验证控件的的change事件

下面是实例：

<?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">
	<s:layout>
		<s:BasicLayout/>
	</s:layout>
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
		<mx:StringValidator
			source="{address}"
			minLength="5"
			property="text"
			trigger="{address}"
			triggerEvent="change"
			/>
	</fx:Declarations>
	
	<s:VGroup horizontalCenter="0" verticalCenter="0">
		<s:Label text="userName:"/>
		<s:TextInput id="address"/>
		<s:Button label="Submit" id="submitButton"/>
	</s:VGroup>
</s:Application>