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Event subscriber for hook_field_widget_single_element_WIDGET_TYPE_form_alter does not work

Open on Drupal.org →
Created on 2 January 2024, 6 months ago
Updated 20 January 2024, 5 months ago

Problem/Motivation

Attempting to replace an implementation of hook_field_widget_single_element_WIDGET_TYPE_form_alter with an event subscriber by following the example at \Drupal\hook_event_dispatcher\ExampleFieldEventSubscribers does not work. The event subscriber method is never called.

Steps to reproduce

  1. Install paragraphs module, create a paragraph type, create a field on a content type that references the paragraph type.
  2. Add the equivalent hook to a .module file for comparison purposes:
    /**
 * Implements hook_field_widget_single_element_WIDGET_TYPE_form_alter().
 */
function MY_MODULE_field_widget_single_element_paragraphs_form_alter(&$element, &$form_state, $context): void {
  if ($element['#paragraph_type'] === 'MY_PARAGRAPH_TYPE') {
    // Code here.
  }
}
  3. Clear caches.
  4. Create a node of the content type. Add a paragraph. See that the hook is called.
  5. Enable field_event_dispatcher module.
  6. Create an event subscriber class with these methods:
      /**
   * {@inheritdoc}
   *
   * Establish what events this subscriber responds to.
   *
   * To add specific base form forms:
   * 'hook_event_dispatcher.form_base_node_form.alter' => 'alterNodeForm',
   */
  public static function getSubscribedEvents() {
    return [
      FormHookEvents::FORM_ALTER => 'alterEventNodeForm',
      FieldHookEvents::WIDGET_SINGLE_ELEMENT_FORM_ALTER => 'widgetSingleElementAlter',
      'hook_event_dispatcher.widget_single_element_paragraphs.alter' => 'widgetSingleElementParagraphsAlter',
      FieldHookEvents::WIDGET_COMPLETE_FORM_ALTER => 'widgetCompleteAlter'
    ];
  }

  /**
   * EQUIVALENT: hook_field_widget_single_element_WIDGET_TYPE_form_alter().
   *
   * @param \Drupal\field_event_dispatcher\Event\Field\WidgetSingleElementTypeFormAlterEvent $event
   *   The event.
   */
  public function widgetSingleElementParagraphsAlter(WidgetSingleElementTypeFormAlterEvent $event): void {
    $element = &$event->getElement();
    if (isset($element['#paragraph_type']) && $element['#paragraph_type'] === 'p_location_off_campus') {
      // Code here.
    }
  }
  
  // Add other methods from getSubscribedEvents() if you like. All the other methods will be called as expected.
  7. Clear caches.
  8. Create a node of the content type. Add a paragraph. See that the hook is called. See that the event subscriber method is not.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

🐛 Bug report
Status

Fixed

Version

4.0

Component

Code

Created by

🇺🇸United States maskedjellybean Portland, OR

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