drupal-8 - 如何创建允许配置表单中的无限值的实体引用字段？

Question

  public function buildForm(array $form, FormStateInterface $form_state) {
          $form = parent::buildForm($form, $form_state);
          $config = $this->config('category_dynamic_block.settings');

          $form['section_title'] = array(
            '#type' => 'textfield',
            '#title' => $this->t('Section Title'),
            '#description' => $this->t('Enter a Section Title'),
          );

          $form['term_name'] = array(
            '#type' => 'entity_autocomplete',
            '#target_type' => 'taxonomy_term',
            '#selection_settings' => [
                 'target_bundles' => array('categories'),
            ],
            '#title' => $this->t('Term Name'),
              '#description' => $this->t('Enter a Category Vocab Term Name'),
          );

          $form['page_title'] = array(
            '#type' => 'entity_autocomplete',
            '#target_type' => 'node',
            '#selection_settings' => [
                'target_bundles' => array('article'),
            ],
            '#title' => $this->t('Page Title (' . $i . ')'),
            '#description' => $this->t('Enter Page Title to be displayed'),
          );

          return $form;}

我正在创建一个配置表单，我正在尝试查找 drupal 8 中是否有一种方法允许用户为 $form['page_title'] 字段输入多个值。

Answer 1

这个问题（带有表单 api 的无限文本字段）可能是您正在寻找的：https ://drupal.stackexchange.com/questions/208012/unlimited-textfields-with-form-api

基本上你需要添加一些ajax：

'#ajax' => [
  'callback' => array($this, 'addMultipleItems'),
  'event' => 'change',
  'progress' => array(
    'type' => 'throbber',
    'message' => t('Adding another item...'),
  ),
],