Add support for custom form-element supporting entity_reference

Thank you, Stephan, for bringing up this topic.

I've refactored the Tagify element in order to facilitate the custom integration.

You could try to check if everything works fine for you with something like:

$form['user_reference'] = [
  '#type' => 'entity_autocomplete_tagify',
  '#target_type' => 'user',
  '#title' => $this->t('Users'),
  '#description' => $this->t('Enter a user name.'),
];

Or if you need to use attributes or so, follow the next example, please:

$form['my_element'] = [
  '#type' => 'entity_autocomplete_tagify',
  '#target_type' => 'node',
  '#tags' => TRUE,
  '#default_value' => $array_of_entities,
  '#selection_handler' => 'default',
  '#selection_settings' => [
    'target_bundles' => ['article', 'page'],
    'info_label' => '[node:type]',
   ],
  '#autocreate' => [
    'bundle' => 'article',
    'uid' => <a valid user ID>,
   ],
  '#max_items' => 10,
  '#suggestions_dropdown' => 1,
  '#match_operator' => 'CONTAINS',
  '#show_entity_id' => 0,
  '#identifier' => 'field_name',
];

I will document this part, when the issue will be reviewed.

Demo from #7 form example.

If you also want to have current user as default value, you'd need to pass an array of entities to '#default_value', in this case with current:

$current_user = \Drupal::currentUser();
$uid = $current_user->id();
$current_user_entity = \Drupal::entityTypeManager()->getStorage('user')->load($uid);
      
$form['user_reference'] = [
  '#type' => 'entity_autocomplete_tagify',
  '#target_type' => 'user',
  '#title' => $this->t('Users'),
  '#description' => $this->t('Enter a user name.'),
  '#default_value' => [$current_user_entity],
];

I have an issue:
Code:

          $form['vocabulary_' . $category->tid] = [
            '#title' => $this->t('You will add these tags'),
            '#prefix' => '<h2>' . $category->name . '</h2>',
            '#type' => 'entity_autocomplete_tagify',
            '#target_type' => 'taxonomy_term',
            '#tags' => TRUE,
            '#selection_handler' => 'default',
            '#selection_settings' => [
              'target_bundles' => ['tags'],
              'bundle' => ('tags'),
            ],
            '#autocreate' => [
              'bundle' => 'tags',
            ],
            '#description' => $this->t('for all documents below simultaneously'),
            '#wrapper_attributes' => [
              'id' => 'odt-filter',
              'class' => ['container-inline'],
            ],
            '#max_items' => 10,
            '#suggestions_dropdown' => 1,
            '#match_operator' => 'CONTAINS',
            '#show_entity_id' => 0,
            '#identifier' => 'vocabulary_' . $category->tid,
          ];

I'm not quite sure what '#identifier' is
version: '1.2.15+3-dev'
php: 8.1.27
drupal: 10.2.2
Errors:

TypeError: preg_match(): Argument #2 ($subject) must be of type string, array given in preg_match() (line 207 of ...
...\core\lib\Drupal\Core\Routing\UrlGenerator.php).

and
Warning: Undefined array key "#placeholder" in Drupal\tagify\Element\EntityAutocompleteTagify::processEntityAutocompleteTagify() (line 152 of ...\modules\contrib\tagify\src\Element\EntityAutocompleteTagify.php)

Hi @drebroff,

It's quite tricky to get this working in the current version of the module, for that reason Stephan created this "feature request" issue. Perhaps you could try forking this issue, where we are facilitating the creation of form elements with Tagify as a new feature.

Once the feature created in this issue is released, the creation of Tagify form elements will be much easier, as described in the comments.

So, your example code should works as expected with this new feature.

BTW: The #identifier attribute is used to differentiate between multiple Tagify elements in a form and it will be optional.

It will be included on release 1.2.18