function SubmitDriven::buildForm

File

modules/ajax_example/src/Form/SubmitDriven.php, line 23

Class

SubmitDriven

Submit a form without a page reload.

Namespace

Code

public function buildForm(array $form, FormStateInterface $form_state) {
  // This container wil be replaced by AJAX.
  $form['container'] = [
    '#type' => 'container',
    '#attributes' => [
      'id' => 'box-container',
    ],
  ];
  // The box contains some markup that we can change on a submit request.
  $form['container']['box'] = [
    '#type' => 'markup',
    '#markup' => '<h1>Initial markup for box</h1>',
  ];
  $form['submit'] = [
    '#type' => 'submit',
    // The AJAX handler will call our callback, and will replace whatever page
    // element has id box-container.
'#ajax' => [
      'callback' => '::promptCallback',
      'wrapper' => 'box-container',
    ],
    '#value' => $this->t('Submit'),
  ];
  return $form;
}