PHP FieldItemListInterface::referencedEntities方法代码示例

 /**
  * {@inheritdoc}
  */
 public function getValueFromProperty(FieldItemListInterface $property, $delta = 0)
 {
     if ($property->getValue() && $property->getFieldDefinition()->getCardinality() == 1) {
         return $property->referencedEntities()[0];
     }
     return $property->referencedEntities();
 }

 /**
  * {@inheritdoc}
  */
 public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state)
 {
     $referenced_entities = $items->referencedEntities();
     $element = parent::formElement($items, $delta, $element, $form, $form_state);
     // If this is an existing (not new item).
     if ($delta < count($referenced_entities)) {
         // Mark element as being existing, not new item.
         // Top level of the returned element must be called 'target_id',
         // so we cannot create a container.
         // Autocomplete element does some fancy processing to handle empty strings,
         // so we must use an autocomplete element not a hidden or textfield element.
         // But #states[#visible] does not seem to have an option to always hide.,
         // and autocomplete elements don't seem to accept #attributes, so we must
         // use #prefix and #suffix to add a class so that we can hide it.
         $element['#prefix'] = '<div class="er-enhanced-existing">';
         $element['#suffix'] = '</div>';
         if ($this->getSetting('preview')) {
             // Add preview.
             $element['#prefix'] = '<div class="er-enhanced-existing er-enhanced-previewing">';
             $element['#attached']['library'][] = 'ahs_er_enhanced/preview';
             $entityTypeName = $referenced_entities[$delta]->getEntityType()->id();
             $view_builder = \Drupal::entityTypeManager()->getViewBuilder($entityTypeName);
             $preview = $view_builder->view($referenced_entities[$delta], $this->getSetting('preview_view_mode'));
             $element['preview_container'] = ['#type' => 'container', '#attributes' => ['class' => ['er-enhanced-preview']], 'preview' => $preview];
             // Add a remove link to the preview.
             $element['remove'] = ['#markup' => '<a class="er-enhanced-remove" href="">' . t('Remove') . '</a>'];
             $element['#attached']['library'][] = 'ahs_er_enhanced/remove';
         }
     } else {
         $element['#prefix'] = '<div class="er-enhanced-new">';
         $element['#suffix'] = '</div>';
     }
     return $element;
 }

 /**
  * {@inheritdoc}
  */
 public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state)
 {
     $entity = $items->getEntity();
     $referenced_entities = $items->referencedEntities();
     $element += array('#type' => 'entity_autocomplete', '#target_type' => $this->getFieldSetting('target_type'), '#selection_handler' => $this->getFieldSetting('handler'), '#selection_settings' => $this->getFieldSetting('handler_settings'), '#validate_reference' => FALSE, '#maxlength' => 1024, '#default_value' => isset($referenced_entities[$delta]) ? $referenced_entities[$delta] : NULL, '#size' => $this->getSetting('size'), '#placeholder' => $this->getSetting('placeholder'));
     if ($this->getSelectionHandlerSetting('auto_create')) {
         $element['#autocreate'] = array('bundle' => $this->getAutocreateBundle(), 'uid' => $entity instanceof EntityOwnerInterface ? $entity->getOwnerId() : \Drupal::currentUser()->id());
     }
     return array('target_id' => $element);
 }

  /**
   * {@inheritdoc}
   */
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
    $field_name = $this->fieldDefinition->getName();
    $parents = $form['#parents'];
    $referenced_entities = $items->referencedEntities();

    if (isset($referenced_entities[$delta])) {
      $entity_label = EntityAutocomplete::getEntityLabels([$referenced_entities[$delta]]);
      $id_prefix = implode('-', array_merge($parents, [$field_name, $delta]));

      $element += [
        '#type' => 'container',
        '#attributes' => ['class' => ['form--inline']],
        'target_id' => [
          '#type' => 'item',
          '#markup' => $entity_label,
          '#default_value' => !$referenced_entities[$delta]->isNew() ? $referenced_entities[$delta]->id() : NULL,
        ],
        'entity' => [
          '#type' => 'value',
          '#default_value' => $referenced_entities[$delta],
        ],
        'remove' => [
          '#type' => 'submit',
          '#name' => strtr($id_prefix, '-', '_') . '_remove',
          '#value' => t('Remove'),
          '#attributes' => ['class' => ['remove-item-submit', 'align-right']],
          '#submit' => [[get_class($this), 'removeSubmit']],
          '#ajax' => [
            'callback' => [get_class($this), 'getWidgetElementAjax'],
            'wrapper' => $this->getWrapperId(),
            'effect' => 'fade',
          ],
        ],
      ];
    }

    return $element;
  }