I'm looking to add a form inside a custom template. The form, if I open the path registered inside the file cmodule.routing.yml, works but if i try to use it inside a custom template it doesn't work: with a dump(form) or dump(form.anyfield) i get NULL.


  path: '/cmodule/manageform'
    _title: 'Documents'
    _form: '\Drupal\cmodule\Forms\RequestForm'
    _permission: 'access content'
  path: '/cmodule/manage'
    _controller: '\Drupal\cmodule\Controller\CmoduleController::manageAction'
    _title: 'Custom Documents'
    _permission: 'access content'


 * {@inheritdoc}
public function buildForm(array $form, FormStateInterface $form_state) {

    $form['type'] = array(
        '#type' => 'radios',
        '#options' => array(
            '0' =>t('DOC'),
            '1' =>t('PDF')
    $form['pid'] = array(
        '#type' => 'textfield',
        '#title' => t('ID:'),
        '#required' => FALSE
    $form['submit'] = array(
        '#type' => 'submit',
        '#value' => $this->t('Submit'),
        '#attributes'=> ['class'=>['glyphicon', 'glyphicon-search']],

    return $form;


 * Implements hook_theme().
function cmodule_theme(){

    $templates = array(
        'manage_cmodule_page' => array(
            'variables' =>
                    'id' => NULL,
                    'form' => NULL
            'template' =>'manage_cmodule',
            'render element' => 'form'

    return $templates;

the controller contains:

public function manageAction() {

        $id = 1;

        $form = \Drupal::formBuilder()->getForm('Drupal\cmodule\Forms\RequestForm');

        $form['type']['#title_display'] = 'invisible';

        return [ '#theme' => 'manage_cmodule_page',
            '#form' => $form,
            '#id' => $id,

and then the template/view (contains):

 {{ form.form_token }}
{{ form.form_build_id }}
{{ form.form_id }} 

But as I said above the template doesn't show the form, but show (if i print it) the #id value passed through the controller. Do you have any suggestions?!

UPDATE #1 I tried also to follow the suggestion of Beebee, and then this and this so the code is:


controller contains:

public function manageAction() {

        $form = \Drupal::formBuilder()->getForm('Drupal\cmodule\Forms\RequestForm');

        $render['#form'] = $form;
        $render['theme'] = 'manage_cmodule_page';
        return $render;;

and the implementation of hook_theme in .module file is:

return [
    'manage_cmodule_page' => [
        'template' =>'manage_cmodule',
        'render element' => 'form',

The result is an empty page with an error inside the apache log:

[php7:error] [pid 12660:tid 1592] [client ::1:59521] PHP Fatal error: Out of memory (allocated 270532608) (tried to allocate 266354688 bytes) in C:\drupal\vendor\twig\twig\lib\Twig\Extension\Debug.php on line 60, referer: http://localhost/drupal/

if I remove the following row from the controller

$render['theme'] = 'manage_atps_page';

the page loads, but it is empty (without any form).


I fixed my issue following also the idea of Alex Kuzava. Thus I used the code of UPDATE 1, with the new directory of the form, and then I added these 3 lines inside the part of my template (otherwise the submit button doesn't work).

{{ form.form.form_build_id }} 
{{ form.form.form_id }}
{{ form.form.form_token }}
  • id is one of those things that'll always be set in a variable array. It's not a good indicator of whether something is working or not.
    – Beebee
    Commented Jun 28, 2018 at 13:33
  • hi, I put here id var only to show you that others variables work.
    – que le
    Commented Jun 28, 2018 at 14:46
  • 2
    Possible duplicate of Send a form to twig template
    – leymannx
    Commented Jul 2, 2018 at 11:02
  • This question gets asked a lot lately. Also see drupal.stackexchange.com/a/263382/15055
    – leymannx
    Commented Jul 2, 2018 at 11:03
  • @leymannx i already saw both links; in one of them i also put a question (i cannot create comment yet), but it has been removed with the suggestion to create a new question.
    – que le
    Commented Jul 2, 2018 at 11:40

2 Answers 2


'render element' => 'form'

Your render element is form which means all provided variables will be passed there.

In your twig template you can render your form like here

<div>{{ form.form }}</div>


Wow man, you have wrong namespace Drupal\cmodule\Forms\RequestForm

Should be Drupal\cmodule\Form\RequestForm

Please rename Forms to Form (the same for directory) and clear cache. It should help you.

  • it doesn't work. please read the update #1
    – que le
    Commented Jul 2, 2018 at 12:04
  • @quele I have updated my answer. Please check Commented Jul 2, 2018 at 14:10
  • @quele any news? Commented Jul 3, 2018 at 9:39
  • I fixed it changing the Form directory, thank you!
    – que le
    Commented Jul 4, 2018 at 12:25

See: https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Render!theme.api.php/function/hook_theme/8.2.x

Each information array must contain either a 'variables' element (for using a #theme element) or a 'render element' element (for render elements), but not both.

Your manage_cmodule_page expects both variables and render element which is not allowed. Removing variables array from your hook_theme should make this work, provided the rest of the code is functional.

  • 1
    I updated my question, because it still doesn't work.
    – que le
    Commented Jul 2, 2018 at 13:38

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.