I made a custom configuration entity, and I'm trying to set up radio buttons in the listBuilder. This is done in the core module language without any problems, but when I try to do the same trick with my custom entity I can't get any radio button. Instead the attributes are rendered in the html element.

    public function buildRow(EntityInterface $entity) {
      $row['label'] = $entity->label();
      $row['default'] = [
        '#type' => 'radio',
        '#parents' => ['site_default_language'],
        '#title' => t('Set @title as default', ['@title' => $entity->label()]),
        '#title_display' => 'invisible',
        '#return_value' => $entity->id(),
        '#id' => 'edit-site-default-language-' . $entity->id(),
      // Mark the right language as default in the form.
      if ($entity->id() == $this->languageManager->getDefaultLanguage()->getId()) {
        $row['default']['#default_value'] = $entity->id();
      return $row + parent::buildRow($entity);

Then I get this html element as a result without any errors in the logs:

<td #type="radio" #parents="active_scsp_server" 
#title="..." #title_display="invisible" 
#return_value="pre" #id="edit-active-scsp-server-pre" #default_value="pre">
  • 1
    Are you extending DraggableListBuilder as well? This thing is actually a Form in disguise.
    – hoanns
    Aug 16, 2021 at 11:36
  • Yes, I am extending DraggableListBuilder, mimicking a big part of LanguageListBuilder. But, the problem is that I am not getting any form... I already tryed to reinstall the entity, clearing cache and so on... Aug 16, 2021 at 12:10
  • Maybe try $row['default'][$entity->id()] = [...]. And can't the #default_value just be TRUE or FALSE or NULL? Can it be an ID?
    – leymannx
    Aug 16, 2021 at 12:35

1 Answer 1


To make the DraggableListBuilder work, the entity need to have a weigth key defined. Otherwise it will fail silently.

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