protected function LibraryItemFieldWidget::formMultipleElements in Library 8

Special handling to create form elements for multiple values.

Handles generic features for multiple fields:

• number of widgets
• AHAH-'add more' button
• table display and drag-n-drop value reordering

Overrides WidgetBase::formMultipleElements

File

src/Plugin/Field/FieldWidget/LibraryItemFieldWidget.php, line 282

Class

LibraryItemFieldWidget

Plugin implementation of the 'library_item_field_widget' widget.

Namespace

Drupal\library\Plugin\Field\FieldWidget

Code

protected function formMultipleElements(FieldItemListInterface $items, array &$form, FormStateInterface $form_state) : array {

  // Taken from inline_entity_form.
  $element = parent::formMultipleElements($items, $form, $form_state);

  // If we're using ulimited cardinality we don't display one empty item. Form
  // validation will kick in if left empty which esentially means people won't
  // be able to submit w/o creating another entity.
  if (!$form_state
    ->isSubmitted() && $element['#cardinality'] == FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED && $element['#max_delta'] > 0) {
    $max = $element['#max_delta'];
    unset($element[$max]);
    $element['#max_delta'] = $max - 1;
    $items
      ->removeItem($max);

    // Decrement the items count.
    $field_name = $element['#field_name'];
    $parents = $element[0]['#field_parents'];
    $field_state = static::getWidgetState($parents, $field_name, $form_state);
    $field_state['items_count']--;
    static::setWidgetState($parents, $field_name, $form_state, $field_state);
  }
  return $element;
}