trait YamlFormTableTrait in YAML Form 8

trait YamlFormTableTrait {

  /**
   * {@inheritdoc}
   */
  public function prepare(array &$element, YamlFormSubmissionInterface $yamlform_submission) {
    parent::prepare($element, $yamlform_submission);

    // Add missing element class.
    $element['#attributes']['class'][] = str_replace('_', '-', $element['#type']);

    // Add one column header is not #header is specified.
    if (!isset($element['#header'])) {
      $element['#header'] = [
        isset($element['#title']) ? $element['#title'] : '',
      ];
    }

    // Convert associative array of options into one column row.
    if (isset($element['#options'])) {
      foreach ($element['#options'] as $options_key => $options_value) {
        if (is_string($options_value)) {
          $element['#options'][$options_key] = [
            [
              'value' => $options_value,
            ],
          ];
        }
      }
    }
    if ($this
      ->hasMultipleValues($element)) {
      $element['#element_validate'][] = [
        get_class($this),
        'validateMultipleOptions',
      ];
    }
    $element['#attached']['library'][] = 'yamlform/yamlform.element.' . $element['#type'];
  }

  /**
   * {@inheritdoc}
   */
  public function setDefaultValue(array &$element) {
    if (isset($element['#default_value']) && is_array($element['#default_value'])) {
      $element['#default_value'] = array_combine($element['#default_value'], $element['#default_value']);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function form(array $form, FormStateInterface $form_state) {
    $form = parent::form($form, $form_state);
    $form['options']['js_select'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Select all'),
      '#description' => $this
        ->t('If checked, a select all checkbox will be added to the header.'),
      '#return_value' => TRUE,
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  protected function getTableSelectElementSelectorOptions(array $element, $input_selector = '') {
    $title = $this
      ->getAdminLabel($element) . ' [' . $this
      ->getPluginLabel() . ']';
    $name = $element['#yamlform_key'];
    $type = $this
      ->hasMultipleValues($element) ? $this
      ->t('Checkbox') : $this
      ->t('Radio');
    $selectors = [];
    foreach ($element['#options'] as $value => $text) {
      if (is_array($text)) {
        $text = $value;
      }
      $selectors[":input[name=\"{$name}[{$value}]{$input_selector}\"]"] = $text . ' [' . $type . ']';
    }
    return [
      $title => $selectors,
    ];
  }

}