[]]; return $options; } /** * {@inheritdoc} */ public function buildOptionsForm(&$form, FormStateInterface $form_state) { parent::buildOptionsForm($form, $form_state); $fields = ['' => $this->t('')]; $fields += $this->displayHandler->getFieldLabels(TRUE); $form['title_field'] = [ '#type' => 'select', '#title' => $this->t('Title field'), '#options' => $fields, '#required' => FALSE, '#default_value' => $this->options['title_field'], '#description' => $this->t('Select the field that will be used as the title.'), ]; } }