public function AjaxAddMore::removeCallback in Examples for Developers 8

Same name and namespace in other branches

1. 3.x modules/form_api_example/src/Form/AjaxAddMore.php \Drupal\form_api_example\Form\AjaxAddMore::removeCallback()

Submit handler for the "remove one" button.

Decrements the max counter and causes a form rebuild.

File

form_api_example/src/Form/AjaxAddMore.php, line 121

Class

AjaxAddMore

Implements the ajax demo form controller.

Namespace

Drupal\form_api_example\Form

Code

public function removeCallback(array &$form, FormStateInterface $form_state) {
  $name_field = $form_state
    ->get('num_names');
  if ($name_field > 1) {
    $remove_button = $name_field - 1;
    $form_state
      ->set('num_names', $remove_button);
  }

  // Since our buildForm() method relies on the value of 'num_names' to
  // generate 'name' form elements, we have to tell the form to rebuild. If we
  // don't do this, the form builder will not call buildForm().
  $form_state
    ->setRebuild();
}