protected function BookManager::addParentSelectFormElements in Drupal 10

Same name and namespace in other branches

1. 8 core/modules/book/src/BookManager.php \Drupal\book\BookManager::addParentSelectFormElements()
2. 9 core/modules/book/src/BookManager.php \Drupal\book\BookManager::addParentSelectFormElements()

Builds the parent selection form element for the node form or outline tab.

This function is also called when generating a new set of options during the Ajax callback, so an array is returned that can be used to replace an existing form element.

Parameters

array $book_link: A fully loaded book link that is part of the book hierarchy.

Return value

array A parent selection form element.

File

core/modules/book/src/BookManager.php, line 396

Class

BookManager

Defines a book manager.

Namespace

Drupal\book

Code

protected function addParentSelectFormElements(array $book_link) {
  $config = $this->configFactory
    ->get('book.settings');
  if ($config
    ->get('override_parent_selector')) {
    return [];
  }

  // Offer a message or a drop-down to choose a different parent page.
  $form = [
    '#type' => 'hidden',
    '#value' => -1,
    '#prefix' => '<div id="edit-book-plid-wrapper">',
    '#suffix' => '</div>',
  ];
  if ($book_link['nid'] === $book_link['bid']) {

    // This is a book - at the top level.
    if ($book_link['original_bid'] === $book_link['bid']) {
      $form['#prefix'] .= '<em>' . $this
        ->t('This is the top-level page in this book.') . '</em>';
    }
    else {
      $form['#prefix'] .= '<em>' . $this
        ->t('This will be the top-level page in this book.') . '</em>';
    }
  }
  elseif (!$book_link['bid']) {
    $form['#prefix'] .= '<em>' . $this
      ->t('No book selected.') . '</em>';
  }
  else {
    $form = [
      '#type' => 'select',
      '#title' => $this
        ->t('Parent item'),
      '#default_value' => $book_link['pid'],
      '#description' => $this
        ->t('The parent page in the book. The maximum depth for a book and all child pages is @maxdepth. Some pages in the selected book may not be available as parents if selecting them would exceed this limit.', [
        '@maxdepth' => static::BOOK_MAX_DEPTH,
      ]),
      '#options' => $this
        ->getTableOfContents($book_link['bid'], $book_link['parent_depth_limit'], [
        $book_link['nid'],
      ]),
      '#attributes' => [
        'class' => [
          'book-title-select',
        ],
      ],
      '#prefix' => '<div id="edit-book-plid-wrapper">',
      '#suffix' => '</div>',
    ];
  }
  $this->renderer
    ->addCacheableDependency($form, $config);
  return $form;
}