public function AjaxAddMore::addOne 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::addOne()

Submit handler for the "add-one-more" button.

Increments the max counter and causes a rebuild.

File

form_api_example/src/Form/AjaxAddMore.php, line 106

Class

AjaxAddMore

Implements the ajax demo form controller.

Namespace

Drupal\form_api_example\Form

Code

public function addOne(array &$form, FormStateInterface $form_state) {
  $name_field = $form_state
    ->get('num_names');
  $add_button = $name_field + 1;
  $form_state
    ->set('num_names', $add_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();
}