3 namespace Drupal\form_test\Form;
5 use Drupal\Core\Form\FormBase;
6 use Drupal\Core\Form\FormStateInterface;
9 * Form constructor to test the #required property.
11 class FormTestValidateRequiredForm extends FormBase {
16 public function getFormId() {
17 return 'form_test_validate_required_form';
23 public function buildForm(array $form, FormStateInterface $form_state) {
24 $options = ['foo' => 'foo', 'bar' => 'bar'];
25 $validate = ['::elementValidateRequired'];
27 $form['textfield'] = [
28 '#type' => 'textfield',
31 '#required_error' => t('Please enter a name.'),
33 $form['checkboxes'] = [
34 '#type' => 'checkboxes',
35 '#title' => 'Checkboxes',
36 '#options' => $options,
38 '#form_test_required_error' => t('Please choose at least one option.'),
39 '#element_validate' => $validate,
44 '#options' => $options,
46 '#form_test_required_error' => t('Please select something.'),
47 '#element_validate' => $validate,
52 '#options' => $options,
55 $form['radios_optional'] = [
57 '#title' => 'Radios (optional)',
58 '#options' => $options,
60 $form['radios_optional_default_value_false'] = [
62 '#title' => 'Radios (optional, with a default value of FALSE)',
63 '#options' => $options,
64 '#default_value' => FALSE,
66 $form['actions'] = ['#type' => 'actions'];
67 $form['actions']['submit'] = ['#type' => 'submit', '#value' => 'Submit'];
74 public function elementValidateRequired($element, FormStateInterface $form_state) {
75 // Set a custom validation error on the #required element.
76 if (!empty($element['#required_but_empty']) && isset($element['#form_test_required_error'])) {
77 $form_state->setError($element, $element['#form_test_required_error']);
84 public function submitForm(array &$form, FormStateInterface $form_state) {
85 drupal_set_message('The form_test_validate_required_form form was submitted successfully.');