Inserting a form into a block in Drupal? - drupal

Question

Is there any command or method that I can use to insert the contents of a form (e.g. the user registration form) into a block?

Answer 1

In Drupal 7, it looks like this:
function yourmodule_block_view($delta='')
{
switch($delta) {
case 'your_block_name':
$block['subject'] = null; // Most forms don't have a subject
$block['content'] = drupal_get_form('yourmodule_form_function');
break;
}
return $block;
}
The form array returned by drupal_get_form will be automatically rendered.
yourmodule_form_function is a function (in your module or an existing Drupal module) that returns the form array;

Answer 2

drupal_get_form($form_id) - put it in a module's hook_block ($op=='view') or even... shudder... inside a block with PHP filter on.
You need to find the form id first - look for a hidden input with the name form_id within the form. Its value should be the the form id.
Also, you could simply use the Form Block module.

Answer 3

Drupal 8+ solution
Create the form. Then, to create the block use something like this:
<?php
namespace Drupal\my_module\Plugin\Block;
use Drupal\Core\Block\BlockBase;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\my_module\Form\MyForm;
use Symfony\Component\DependencyInjection\ContainerInterface;
/**
* Provides the My Block block.
*
* #Block(
* id = "my_block",
* admin_label = #Translation("My Block")
* )
*/
class MyBlock extends BlockBase implements ContainerFactoryPluginInterface {
/**
* The form builder.
*
* #var \Drupal\Core\Form\FormBuilder
*/
protected $formBuilder;
/**
* Constructs a new MyBlock object.
*
* #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 \Symfony\Component\DependencyInjection\ContainerInterface $container
* Our service container.
*/
public function __construct(array $configuration, $plugin_id, $plugin_definition, ContainerInterface $container) {
parent::__construct($configuration, $plugin_id, $plugin_definition);
$this->formBuilder = $container->get('form_builder');
}
/**
* {#inheritdoc}
*/
public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
return new static(
$configuration,
$plugin_id,
$plugin_definition,
$container
);
}
/**
* {#inheritdoc}
*/
public function build() {
$form = $this->formBuilder->getForm(MyForm::class);
return $form;
// // Or return a render array.
// // in mytheme.html.twig use {{ form }} and {{ data }}.
// return [
// '#theme' => 'mytheme',
// "#form" => $form,
// "#data" => $data,
// ];
}
}