Drupal 8 custom registration form - php

Question

I try to build a custom registration form which should be displayed in a custom block and I don't want to insert the normal registration form and alter it via a hook or use an extension like form_block, because I want to learn the ways how drupal 8 works with forms.
My block looks like this:
<?php
namespace Drupal\ajax_registration_form\Plugin\Block;
use Drupal\ajax_registration_form\Form\AjaxRegistrationForm;
use Drupal\Core\Block\BlockBase;
/**
* Provides a 'AjaxRegistrationBlock' block.
*
* #Block(
* id = "ajax_registration_block",
* admin_label = #Translation("Ajax registration block"),
* )
*/
class AjaxRegistrationBlock extends BlockBase {
/**
* {#inheritdoc}
*/
public function build() {
$content = \Drupal::formBuilder()->getForm(AjaxRegistrationForm::class);
return $content;
}
}
My custom registration form looks like this:
<?php
namespace Drupal\ajax_registration_form\Form;
use Drupal\Core\Form\FormStateInterface;
use Drupal\user\RegisterForm;
class AjaxRegistrationForm extends RegisterForm {
/**
* {#inheritdoc}
*/
public function form(array $form, FormStateInterface $form_state) {
return parent::form($form, $form_state);
}
}
I just tried to extend the normal RegisterForm and in the first step I just wanted to return the parent form to see if it works. But it doesn't...
Error message:
Fatal error: Call to a member function getEntityTypeId() on null in /Users/*******/Sites/priv/radweiser/web/core/lib/Drupal/Core/Entity/EntityForm.php on line 77
I think it's the missing user entity in the form, but I don't know how I can "put" this entity in my form.

Answer 1

I found the solution in the code of the formblock module.
I altered my block to something like this:
<?php
namespace Drupal\ajax_registration_form\Plugin\Block;
use Drupal\Core\Annotation\Translation;
use Drupal\Core\Block\Annotation\Block;
use Drupal\Core\Block\BlockBase;
use Drupal\Core\Entity\EntityFormBuilderInterface;
use Drupal\Core\Entity\EntityManagerInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\Session\AccountInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
/**
* Provides a 'AjaxRegistrationBlock' block.
*
* #Block(
* id = "ajax_registration_block",
* admin_label = #Translation("Ajax registration block"),
* )
*/
class AjaxRegistrationBlock extends BlockBase implements ContainerFactoryPluginInterface {
/**
* The entity manager
*
* #var \Drupal\Core\Entity\EntityManagerInterface.
*/
protected $entityManager;
/**
* The entity form builder
*
* #var \Drupal\Core\Entity\EntityManagerInterface.
*/
protected $entityFormBuilder;
/**
* Constructs a new UserRegisterBlock plugin
*
* #param array $configuration
* A configuration array containing information about the plugin instance.
* #param string $plugin_id
* The plugin_id for the plugin instance.
* #param mixed $plugin_definition
* The plugin implementation definition.
* #param \Drupal\Core\Entity\EntityManagerInterface $entityManager
* The entity manager.
* #param \Drupal\Core\Entity\EntityFormBuilderInterface $entityFormBuilder
* The entity form builder.
*/
public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityManagerInterface $entityManager, EntityFormBuilderInterface $entityFormBuilder) {
parent::__construct($configuration, $plugin_id, $plugin_definition);
$this->entityManager = $entityManager;
$this->entityFormBuilder = $entityFormBuilder;
}
/**
* #inheritdoc
*/
public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
return new static(
$configuration,
$plugin_id,
$plugin_definition,
$container->get('entity.manager'),
$container->get('entity.form_builder')
);
}
/**
* Implements \Drupal\block\BlockBase::build().
*/
public function build() {
$build = array();
$account = $this->entityManager->getStorage('user') ->create(array());
$build['form'] = $this->entityFormBuilder->getForm($account, 'register');
$build['form']['account']['mail']['#description'] = t('');
kint($build['form']['account']);
return $build;
}
/**
*Implements \Drupal\block\BlockBase::blockAccess().
*
* #param \Drupal\Core\Session\AccountInterface $account
*
* #return bool|\Drupal\Core\Access\AccessResult
*/
public function blockAccess(AccountInterface $account) {
return ($account->isAnonymous()) && (\Drupal::config('user.settings')->get('register') != USER_REGISTER_ADMINISTRATORS_ONLY);
}
}
Now I can alter the form and implement ajax logic using the Form Api (alter the mail input description as example)

Answer 2

I have placed this block in front page content but it is not visible
<span data-big-pipe-placeholder-id="callback=Drupal%5Cblock%5CBlockViewBuilder%3A%3AlazyBuilder&args%5B0%5D=userregistrationform&args%5B1%5D=full&args%5B2%5D&token=-MyZMBSv_tseO1_TExVECdGUQnyGrlvE9eST64je7Ho"></span>
it shows like this
FYI I have changed permissions to isAnonymous()