function template_preprocess_fieldset

Prepares variables for fieldset element templates.

Default template: fieldset.html.twig.

Parameters

array $variables: An associative array containing:

• element: An associative array containing the properties of the element. Properties used: #attributes, #children, #description, #id, #title, #value.

File

core/includes/form.inc, line 194

Functions for form and batch generation and processing.

Code

function template_preprocess_fieldset(&$variables) {
  $element = $variables['element'];
  Element::setAttributes($element, [
    'id',
  ]);
  RenderElementBase::setAttributes($element);
  $variables['attributes'] = $element['#attributes'] ?? [];
  $variables['prefix'] = $element['#field_prefix'] ?? NULL;
  $variables['suffix'] = $element['#field_suffix'] ?? NULL;
  $variables['title_display'] = $element['#title_display'] ?? NULL;
  $variables['children'] = $element['#children'];
  $variables['required'] = !empty($element['#required']) ? $element['#required'] : NULL;
  if (isset($element['#title']) && $element['#title'] !== '') {
    $variables['legend']['title'] = [
      '#markup' => $element['#title'],
    ];
  }
  $variables['legend']['attributes'] = new Attribute();

  // Add 'visually-hidden' class to legend span.
  if ($variables['title_display'] == 'invisible') {
    $variables['legend_span']['attributes'] = new Attribute([
      'class' => [
        'visually-hidden',
      ],
    ]);
  }
  else {
    $variables['legend_span']['attributes'] = new Attribute();
  }
  if (!empty($element['#description'])) {
    $description_id = $element['#attributes']['id'] . '--description';
    $description_attributes['id'] = $description_id;
    $variables['description_display'] = $element['#description_display'];
    if ($element['#description_display'] === 'invisible') {
      $description_attributes['class'][] = 'visually-hidden';
    }
    $description_attributes['data-drupal-field-elements'] = 'description';
    $variables['description']['attributes'] = new Attribute($description_attributes);
    $variables['description']['content'] = $element['#description'];

    // Add the description's id to the fieldset aria attributes.
    $variables['attributes']['aria-describedby'] = $description_id;
  }

  // Suppress error messages.
  $variables['errors'] = NULL;
}