How to check string length in Flex 3.0?

참 flex는 하다보니 편한 함수가 꽤 있네요
문자열의 수를 체크할 일이 개발하다보면 종종 있는데 보통 자바스크립트 함수로 처리하거나 했는데
Flex에는 이걸 대비한 함수가 있네요
일부러 만들지 마시구 있는거 쓰자구요 ^^


<mx:StringValidator
    maxLength="NaN"
    minLength="NaN"
    tooLongError="This string is longer than the maximum allowed length. This must be less than {0} characters long."
    tooShortError="This string is shorter than the minimum allowed length. This must be at least {0} characters long."
  />


아래는 StringValidator example입니다.

<?xml version="1.0" encoding="utf-8"?>
<!-- Simple example to demonstrate StringValidator. -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

    <mx:Script>
        import mx.controls.Alert;
    </mx:Script>

    <mx:StringValidator source="{fname}" property="text"
        tooShortError="This string is shorter than the minimum allowed length of 4. "
        tooLongError="This string is longer than the maximum allowed length of 20."
        minLength="4" maxLength="20" 
        trigger="{myButton}" triggerEvent="click"
        valid="Alert.show('Validation Succeeded!');"/>

    <mx:Panel title="StringValidator Example" width="75%" height="75%"
        paddingTop="10" paddingLeft="10" paddingRight="10" paddingBottom="10">

            <mx:Form>              
                <mx:FormItem label="Enter a name between 4 and 20 characters: ">
                    <mx:TextInput id="fname" width="100%"/>
                </mx:FormItem>

                <mx:FormItem >
                    <mx:Button id="myButton" label="Validate" />
                </mx:FormItem>
            </mx:Form>   
    </mx:Panel>
</mx:Application>