onbeforeunload property

OnBeforeUnloadEventHandlerNonNull? get onbeforeunload

Implementation

OnBeforeUnloadEventHandlerNonNull? get onbeforeunload =>
    js_util.getProperty(this, 'onbeforeunload');

set onbeforeunload (OnBeforeUnloadEventHandlerNonNull? newValue)

Implementation

set onbeforeunload(OnBeforeUnloadEventHandlerNonNull? newValue) {
  js_util.setProperty(this, 'onbeforeunload', newValue);
}