dependent_fields-1.0.0/dependent_fields.module

<?php

/**
 * @file
 * Dependent fields module.
 */

use Drupal\Core\Entity\EntityFormInterface;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Field\EntityReferenceFieldItemListInterface;
use Drupal\Core\Field\Plugin\Field\FieldWidget\EntityReferenceAutocompleteWidget;
use Drupal\Core\Form\FormStateInterface;
use Drupal\quickedit\Form\QuickEditFieldForm;

/**
 * Implements hook_field_widget_single_element_form_alter().
 */
function dependent_fields_field_widget_single_element_form_alter(&$element, FormStateInterface $form_state, $context) {
  $form_object = $form_state->getFormObject();
  // Establish whether we're in a normal EntityForm context or an inline
  // QuickeditFieldForm context and retrieve the entity from the respectively
  // appropriate place.
  if (isset($context['items']) && $context['items'] instanceof EntityReferenceFieldItemListInterface) {
    /**
     * @var \Drupal\Core\Field\EntityReferenceFieldItemListInterface $items
     */
    $items = $context['items'];
    $entity = $items->getEntity();
  }
  elseif ($form_object instanceof EntityFormInterface) {
    $entity = $form_object->getEntity();
  }
  else {
    // @phpstan-ignore-next-line
    if ($form_object instanceof QuickEditFieldForm) {
      // @todo consider removing QuickEditFieldForm (it's no longer in core).
      $entity = $form_state->getBuildInfo()['args'][0];
    }
    else {
      $entity = new stdClass();
    }
  }

  if ($entity instanceof EntityInterface) {
    // Check if the field is a dependent field.
    /** @var \Drupal\Core\Field\FieldItemList $items */
    $items = $context['items'];
    $current_field = $items->getFieldDefinition()->getName();

    // Check if field is configured as parent of one dependent field.
    if (method_exists($entity, 'getFieldDefinitions')) {
      $fields_definitions = $entity->getFieldDefinitions();

      // Check if current field has children.
      $child_fields = [];
      foreach ($fields_definitions as $field_name => $field_definition) {
        $handler = $field_definition->getSetting('handler');
        if ($handler == 'dependent_fields_selection') {
          $handle_settings = $field_definition->getSetting('handler_settings');

          if (isset($handle_settings['dependent_fields_view']['parent_field'])) {
            $parent_field = $handle_settings['dependent_fields_view']['parent_field'];
            $has_children = ($parent_field == $current_field);

            if ($has_children) {
              $child_fields[] = $field_name;
            }
          }
        }
      }

      // Add ajax to parent field.
      if (count($child_fields)) {
        $children = $element['#ajax']['dependent_field_children'] ?? [];
        $children += $child_fields;

        $ajax_definition = [
          'callback' => '\Drupal\dependent_fields\Plugin\EntityReferenceSelection\ViewsSelection::updateDependentField',
          'event' => 'change',
          'progress' => [
            'type' => 'throbber',
          ],
          'dependent_field_children' => $children,
        ];

        if (!empty($context['widget']) && $context['widget'] instanceof EntityReferenceAutocompleteWidget && !empty($element['target_id'])) {
          $ajax_definition['event'] = 'autocompleteclose';
          $element['target_id']['#ajax'] = $ajax_definition;
        }
        else {
          $element['#ajax'] = $ajax_definition;
        }

        $element['#attached']['library'][] = 'dependent_fields/dependentField';
      }
      // Make sure multi value dependent fields stay multi value,
      // even if they don't have any options initially.
      if (isset($entity->getFieldDefinitions()[$current_field]) &&
        $entity->getFieldDefinitions()[$current_field]->getFieldStorageDefinition()->getCardinality() === -1 &&
        $entity->getFieldDefinitions()[$current_field]->getSetting('handler') === 'dependent_fields_selection' &&
        in_array($element['#type'], ['select', 'select2']) &&
        !$element['#multiple']
      ) {
        $element['#multiple'] = TRUE;
      }
    }
  }
}