function EntityReferenceLabelFormatter::viewElements

Overrides FormatterInterface::viewElements

File

core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceLabelFormatter.php, line 58

Class

EntityReferenceLabelFormatter

Plugin implementation of the 'entity reference label' formatter.

Namespace

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
    $elements = [];
    $output_as_link = $this->getSetting('link');
    foreach ($this->getEntitiesToView($items, $langcode) as $delta => $entity) {
        $label = $entity->label();
        // If the link is to be displayed and the entity has a uri, display a
        // link.
        if ($output_as_link && !$entity->isNew()) {
            try {
                $uri = $entity->toUrl();
            } catch (UndefinedLinkTemplateException $e) {
                // This exception is thrown by \Drupal\Core\Entity\Entity::urlInfo()
                // and it means that the entity type doesn't have a link template nor
                // a valid "uri_callback", so don't bother trying to output a link for
                // the rest of the referenced entities.
                $output_as_link = FALSE;
            }
        }
        if ($output_as_link && isset($uri) && !$entity->isNew()) {
            $elements[$delta] = [
                '#type' => 'link',
                '#title' => $label,
                '#url' => $uri,
                '#options' => $uri->getOptions(),
            ];
            if (!empty($items[$delta]->_attributes)) {
                $elements[$delta]['#options'] += [
                    'attributes' => [],
                ];
                $elements[$delta]['#options']['attributes'] += $items[$delta]->_attributes;
                // Unset field item attributes since they have been included in the
                // formatter output and shouldn't be rendered in the field template.
                unset($items[$delta]->_attributes);
            }
        }
        else {
            $elements[$delta] = [
                '#plain_text' => $label,
            ];
        }
        $elements[$delta]['#cache']['tags'] = $entity->getCacheTags();
    }
    return $elements;
}