1 form.inc theme_container($variables)

Returns HTML to wrap child elements in a container.

Used for grouped form items. Can also be used as a theme wrapper for any renderable element, to surround it with a <div> and add attributes such as classes or an HTML id.

theme_container() also handles 'checkboxes' and 'radios' elements. See: https://docs.backdropcms.org/change-records/functions-theme_radios-and-t...

See the Form API reference for more information on the #theme_wrappers render array property.


$variables: An associative array containing:

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

Related topics


core/includes/form.inc, line 3638
Functions for form and batch generation and processing.


function theme_container($variables) {
  $element = $variables['element'];
  // Ensure #attributes is set, while preserving any existing attribute(s).
  $element += array('#attributes' => array());

  // Special handling for form elements.
  if (isset($element['#array_parents'])) {
    // Assign an HTML ID.
    if (!array_key_exists('id', $element['#attributes'])) {
      $element['#attributes']['id'] = $element['#id'];
    // Add the 'form-wrapper' class if not already added, but only for
    // 'container' elements. theme_container() also handles 'checkboxes' and
    // 'radios' elements, but #states breaks for them if the 'form-wrapper'
    // class is added.
    if (isset($element['#type']) && $element['#type'] == 'container') {
      // Ensure that the class attribute is set, while preserving any existing
      // classes.
      $element['#attributes'] += array('class' => array());
      if (!in_array('form-wrapper', $element['#attributes']['class'])) {
        $element['#attributes']['class'][] = 'form-wrapper';

  return '<div' . backdrop_attributes($element['#attributes']) . '>' . $element['#children'] . '</div>';