--- /dev/null
+<?php
+
+namespace Drupal\form_test\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Symfony\Component\HttpFoundation\JsonResponse;
+
+/**
+ * Form constructor to test expansion of #type checkboxes and radios.
+ */
+class FormTestCheckboxesRadiosForm extends FormBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'form_test_checkboxes_radios';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state, $customize = FALSE) {
+ // Expand #type checkboxes, setting custom element properties for some but not
+ // all options.
+ $form['checkboxes'] = [
+ '#type' => 'checkboxes',
+ '#title' => 'Checkboxes',
+ '#options' => [
+ 0 => 'Zero',
+ 'foo' => 'Foo',
+ 1 => 'One',
+ 'bar' => $this->t('<em>Bar - checkboxes</em>'),
+ '>' => "<em>Special Char</em><script>alert('checkboxes');</script>",
+ ],
+ ];
+ if ($customize) {
+ $form['checkboxes'] += [
+ 'foo' => [
+ '#description' => 'Enable to foo.',
+ ],
+ 1 => [
+ '#weight' => 10,
+ ],
+ ];
+ }
+
+ // Expand #type radios, setting custom element properties for some but not
+ // all options.
+ $form['radios'] = [
+ '#type' => 'radios',
+ '#title' => 'Radios',
+ '#options' => [
+ 0 => 'Zero',
+ 'foo' => 'Foo',
+ 1 => 'One',
+ 'bar' => '<em>Bar - radios</em>',
+ '>' => "<em>Special Char</em><script>alert('radios');</script>",
+ ],
+ ];
+ if ($customize) {
+ $form['radios'] += [
+ 'foo' => [
+ '#description' => 'Enable to foo.',
+ ],
+ 1 => [
+ '#weight' => 10,
+ ],
+ ];
+ }
+
+ $form['submit'] = ['#type' => 'submit', '#value' => 'Submit'];
+
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ $form_state->setResponse(new JsonResponse($form_state->getValues()));
+ }
+
+}