Callback for submit_driven example.

Select the 'box' element, change the markup in it, and return it as a renderable array.

Return value

array Renderable array (the box element)

File

modules/ajax_example/src/Form/SubmitDriven.php, line 64

Class

SubmitDriven

Submit a form without a page reload.

Namespace

Drupal\ajax_example\Form

Code

public function promptCallback(array &$form, FormStateInterface $form_state) {
  // In most cases, it is recommended that you put this logic in form
  // generation rather than the callback. Submit driven forms are an
  // exception, because you may not want to return the form at all.
  $element = $form['container'];
  $element['box']['#markup'] = "Clicked submit ({$form_state->getValue('op')}): " . date('c');
  return $element;
}