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( );
}
}
}
}