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Use ActionScript to validate form data

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)">   <mx:Script>            import mx.validators.Validator;       private var _validator:Validator;       private function initializeHandler(event:Event):void {         _validator = new Validator( );         _validator.source = username;         _validator.property = "text";       }      </mx:Script>   <mx:Form>     <mx:FormHeading label="Sample Form"/>     <mx:FormItem label="Name">       <mx:TextInput id="username"/>     </mx:FormItem>     <mx:FormItem>       <mx:Button id="button" label="Submit"/>     </mx:FormItem>   </mx:Form> </mx:Application>