3 namespace Drupal\form_test;
5 use Drupal\Core\Form\FormStateInterface;
8 * Simple class for testing methods as Form API callbacks.
13 * Form element validation handler for 'name' in form_test_validate_form().
15 public function validateName(&$element, FormStateInterface $form_state) {
17 if ($form_state->getValue('name') == 'element_validate') {
18 // Alter the form element.
19 $element['#value'] = '#value changed by #element_validate';
20 // Alter the submitted value in $form_state.
21 $form_state->setValueForElement($element, 'value changed by setValueForElement() in #element_validate');
25 if ($form_state->getValue('name') == 'element_validate_access') {
26 $form_state->set('form_test_name', $form_state->getValue('name'));
27 // Alter the form element.
28 $element['#access'] = FALSE;
32 elseif ($form_state->has('form_test_name')) {
33 // To simplify this test, just take over the element's value into $form_state.
34 $form_state->setValueForElement($element, $form_state->get('form_test_name'));
40 // Output the element's value from $form_state.
41 drupal_set_message(t('@label value: @value', ['@label' => $element['#title'], '@value' => $form_state->getValue('name')]));
43 // Trigger a form validation error to see our changes.
44 $form_state->setErrorByName('');