public function FormAjaxSubscriber::onView in Drupal 8

Same name and namespace in other branches

1. 9 core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php \Drupal\Core\Form\EventSubscriber\FormAjaxSubscriber::onView()

Alters the wrapper format if this is an AJAX form request.

Parameters

\Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent $event: The event to process.

File

core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php, line 63

Class

FormAjaxSubscriber

Wraps AJAX form submissions that are triggered via an exception.

Namespace

Drupal\Core\Form\EventSubscriber

Code

public function onView(GetResponseForControllerResultEvent $event) {

  // To support an AJAX form submission of a form within a block, make the
  // later VIEW subscribers process the controller result as though for
  // HTML display (i.e., add blocks). During that block building, when the
  // submitted form gets processed, an exception gets thrown by
  // \Drupal\Core\Form\FormBuilderInterface::buildForm(), allowing
  // self::onException() to return an AJAX response instead of an HTML one.
  $request = $event
    ->getRequest();
  if ($request->query
    ->has(FormBuilderInterface::AJAX_FORM_REQUEST)) {
    $request->query
      ->set(MainContentViewSubscriber::WRAPPER_FORMAT, 'html');
  }
}