If the result of the validate() method call is invalid then display an alert

        

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
  <mx:Script>
    

      import mx.events.ValidationResultEvent;
      import mx.controls.Alert;

      private function runValidators(event:Event):void {
        var validationResultEvent:ValidationResultEvent = validator.validate(null, true);
        if(validationResultEvent.type == ValidationResultEvent.INVALID) {
            Alert.show("Required");
        }
      }
  
  </mx:Script>
  <mx:Form>
    <mx:FormItem id="usernameItem" label="Name">
      <mx:TextInput id="username"/>
    </mx:FormItem>
    <mx:FormItem>
      <mx:Button id="button" label="Submit" click="runValidators(event)" />
    </mx:FormItem>
  </mx:Form>

  <mx:Validator id="validator" source="{username}" property="text"/>

</mx:Application>

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If the result of the validate() method call is invalid then display an alert : Alert « Components « Flex

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