public function AddFormBase::updateFormCallback in Drupal 8

Same name and namespace in other branches

1. 9 core/modules/media_library/src/Form/AddFormBase.php \Drupal\media_library\Form\AddFormBase::updateFormCallback()
2. 10 core/modules/media_library/src/Form/AddFormBase.php \Drupal\media_library\Form\AddFormBase::updateFormCallback()

AJAX callback to update the entire form based on source field input.

Parameters

array $form: The complete form.

\Drupal\Core\Form\FormStateInterface $form_state: The current form state.

Return value

\Drupal\Core\Ajax\AjaxResponse|array The form render array or an AJAX response object.

File

core/modules/media_library/src/Form/AddFormBase.php, line 592

Class

AddFormBase

Provides a base class for creating media items from within the media library.

Namespace

Drupal\media_library\Form

Code

public function updateFormCallback(array &$form, FormStateInterface $form_state) {
  $triggering_element = $form_state
    ->getTriggeringElement();
  $wrapper_id = $triggering_element['#ajax']['wrapper'];
  $added_media = $form_state
    ->get('media');
  $response = new AjaxResponse();

  // When the source field input contains errors, replace the existing form to
  // let the user change the source field input. If the user input is valid,
  // the entire modal is replaced with the second step of the form to show the
  // form fields for each media item.
  if ($form_state::hasAnyErrors()) {
    $response
      ->addCommand(new ReplaceCommand('#media-library-add-form-wrapper', $form));
    return $response;
  }

  // Check if the remove button is clicked.
  if (end($triggering_element['#parents']) === 'remove_button') {

    // When the list of added media is empty, return to the media library and
    // shift focus back to the first tabbable element (which should be the
    // source field).
    if (empty($added_media)) {
      $response
        ->addCommand(new ReplaceCommand('#media-library-add-form-wrapper', $this
        ->buildMediaLibraryUi($form_state)));
      $response
        ->addCommand(new InvokeCommand('#media-library-add-form-wrapper :tabbable', 'focus'));
    }
    else {
      $response
        ->addCommand(new ReplaceCommand("#{$wrapper_id}", $form));

      // Find the delta of the next media item. If there is no item with a
      // bigger delta, we automatically use the delta of the previous item and
      // shift the focus there.
      $removed_delta = array_slice($triggering_element['#array_parents'], -2, 1)[0];
      $delta_to_focus = 0;
      foreach ($added_media as $delta => $media) {
        $delta_to_focus = $delta;
        if ($delta > $removed_delta) {
          break;
        }
      }
      $response
        ->addCommand(new InvokeCommand("[data-media-library-added-delta={$delta_to_focus}]", 'focus'));
    }
  }
  else {
    $response
      ->addCommand(new ReplaceCommand("#{$wrapper_id}", $form));
    $response
      ->addCommand(new InvokeCommand('.js-media-library-add-form-added-media', 'focus'));
  }
  return $response;
}