Creates a group formatted as vertical tabs.

Parameters

array $element: An associative array containing the properties and children of the details element.

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

array $complete_form: The complete form structure.

Return value

array The processed element.

File

core/lib/Drupal/Core/Render/Element/VerticalTabs.php, line 102

Class

VerticalTabs

Provides a render element for vertical tabs in a form.

Namespace

Drupal\Core\Render\Element

Code

public static function processVerticalTabs(&$element, FormStateInterface $form_state, &$complete_form) {
  if (isset($element['#access']) && !$element['#access']) {
    return $element;
  }
  // Inject a new details as child, so that form_process_details() processes
  // this details element like any other details.
  $element['group'] = [
    '#type' => 'details',
    '#theme_wrappers' => [],
    '#parents' => $element['#parents'],
  ];
  // Add an invisible label for accessibility.
  if (!isset($element['#title'])) {
    $element['#title'] = t('Vertical Tabs');
    $element['#title_display'] = 'invisible';
  }
  $element['#attached']['library'][] = 'core/drupal.vertical-tabs';
  // The JavaScript stores the currently selected tab in this hidden
  // field so that the active tab can be restored the next time the
  // form is rendered, e.g. on preview pages or when form validation
  // fails.
  $name = implode('__', $element['#parents']);
  if ($form_state->hasValue($name . '__active_tab')) {
    $element['#default_tab'] = $form_state->getValue($name . '__active_tab');
  }
  $element[$name . '__active_tab'] = [
    '#type' => 'hidden',
    '#default_value' => $element['#default_tab'],
    '#attributes' => [
      'class' => [
        'vertical-tabs__active-tab',
      ],
    ],
  ];
  // Clean up the active tab value so it's not accidentally stored in
  // settings forms.
  $form_state->addCleanValueKey($name . '__active_tab');
  return $element;
}

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