--- /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 for testing #type 'machine_name' elements.
+ */
+class FormTestMachineNameForm extends FormBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'form_test_machine_name';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $form['machine_name_1_label'] = [
+ '#type' => 'textfield',
+ '#title' => 'Machine name 1 label',
+ ];
+ $form['machine_name_1'] = [
+ '#type' => 'machine_name',
+ '#title' => 'Machine name 1',
+ '#description' => 'A machine name.',
+ '#machine_name' => [
+ 'source' => ['machine_name_1_label']
+ ],
+ ];
+ $form['machine_name_2_label'] = [
+ '#type' => 'textfield',
+ '#title' => 'Machine name 2 label',
+ ];
+ $form['machine_name_2'] = [
+ '#type' => 'machine_name',
+ '#title' => 'Machine name 2',
+ '#description' => 'Another machine name.',
+ '#machine_name' => [
+ 'source' => ['machine_name_2_label']
+ ],
+ ];
+ $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()));
+ }
+
+}