loading and displaying real login form and register form from drupal

web/modules/custom/materio_user/materio_user.routing.yml

@@ -1,3 +1,11 @@
+materio_user.register_form:
+  path: '/materio_user/register_form'
+  defaults:
+    _controller: '\Drupal\materio_user\Controller\AjaxRegisterForm::getForm'
+    _format: json
+  requirements:
+    _access: 'TRUE'
+
 materio_user.login_form:
   path: '/materio_user/login_form'
   defaults:

web/modules/custom/materio_user/src/Controller/AjaxRegisterForm.php

@@ -0,0 +1,87 @@
+<?php
+// https://www.qed42.com/blog/autocomplete-drupal-8
+// https://www.drupal.org/docs/8/modules/search-api/developer-documentation/executing-a-search-in-code
+
+namespace Drupal\materio_user\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Form\FormBuilder;
+use Drupal\Core\Form\FormState;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Request;
+// use Drupal\Core\Cache\CacheableJsonResponse;
+// use Drupal\Core\Cache\CacheableMetadata;
+use Drupal\core\render\RenderContext;
+
+
+/**
+ * Defines a route controller for entity autocomplete form elements.
+ */
+class AjaxRegisterForm extends ControllerBase {
+
+  /**
+   * The form builder.
+   *
+   * @var \Drupal\Core\Form\FormBuilder
+   */
+  protected $formBuilder;
+
+  /**
+   * Construct.
+   */
+  public function __construct(FormBuilder $formBuilder) {
+    $this->formBuilder = $formBuilder;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('form_builder')
+    );
+  }
+
+  private function getFormDefinition(){
+    // $language = \Drupal::languageManager()->getCurrentLanguage()->getId();
+    // \Drupal::logger('materio_user')->notice($language);
+    // $this->form_builded = $this->formBuilder->getForm('Drupal\user\Form\UserLoginForm');
+    $entity = \Drupal::entityTypeManager()->getStorage('user')->create(array());
+    $formObject = \Drupal::entityTypeManager()
+      ->getFormObject('user', 'register')
+      ->setEntity($entity);
+    $this->form_builded = $this->formBuilder()->getForm($formObject);
+  }
+
+  /**
+   * Handler for getform request.
+   */
+  public function getForm(Request $request) {
+
+    $this->getFormDefinition();
+
+    $rendered = render($this->form_builded);
+    // $form_builded = $this->form_builded;
+    // $rendered = \Drupal::service('renderer')->executeInRenderContext(new RenderContext(), function () use ($form_builded) {
+    //     return render($form_builded);
+    //   });
+    $data = [
+      'rendered' => $rendered,
+      // '#cache' => [
+      //   'max-age' => \Drupal\Core\Cache\Cache::PERMANENT,
+      //   'tags' => [
+      //     'materio_sapi-search_form-cache',
+      //   ]
+      // ]
+    ];
+
+    $response = new JsonResponse();
+    $response->setData($data);
+    // $response = new CacheableJsonResponse($data);
+    // $response->addCacheableDependency(CacheableMetadata::createFromRenderArray($data));
+
+    return $response;
+  }
+
+}