public function branchPopup($js = 'nojs') {
    if ($js == 'ajax') {
      $response = new AjaxResponse();
      $form['#attached']['library'][] = 'core/drupal.dialog.ajax';
      $response->setAttachments($form['#attached']);
      $modal = new OpenModalDialogCommand(t('Select location'), $this->buildPopupContent(FALSE), $this->popupOptions());
      $response->addCommand($modal);
      return $response;
    }
    else {
      return $this->redirect('user.page');
    }
  }