Responding When Text Is Selected or Deselected: field.addEventListener(FocusEvent.FOCUS_IN, onFocus); : focus event « TextField « Flash / Flex / ActionScript

1. Flash / Flex / ActionScript
2. TextField
3. focus event

Responding When Text Is Selected or Deselected: field.addEventListener(FocusEvent.FOCUS_IN, onFocus);

 

package {

  import flash.display.Sprite;
  import flash.text.TextField;
  import flash.text.TextFieldType;
  import flash.events.FocusEvent;
  
  public class Main extends Sprite {

    private var _field1:TextField = new TextField(  );
    private var _field2:TextField = new TextField(  );

    public function Main(  ) {
      _field1.border = true;
      _field1.background = true;
      _field1.type = TextFieldType.INPUT;
      addChild(_field1);
      _field1.addEventListener(FocusEvent.KEY_FOCUS_CHANGE, onKeyFocus);
      _field2.border = true;
      _field2.background = true;
      _field2.type = TextFieldType.INPUT;
      addChild(_field2);
      _field2.y = 100;
      
    }
    
    private function onKeyFocus(event:FocusEvent):void {
      if(_field1.text == "") {
          event.preventDefault(  );
      }
    }
  }
}

        

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