Iam trying to call custom JQuery code but its just not working

new HtmlCommand() and InvokeCommand(method:css) is just working fine, just my custom script is not executed:


    /** * @file * Contains Drupal\ajax_example\AjaxExampleForm */

    namespace Drupal\ajax_example\Form;

    use Drupal\ajax_example\Ajax\AjaxExampleCommand; use Drupal\Core\Ajax\AjaxResponse; 
    use Drupal\Core\Ajax\CommandInterface; 
    use Drupal\Core\Ajax\ChangedCommand; 
    use Drupal\Core\Ajax\CssCommand; 
    use Drupal\Core\Ajax\HtmlCommand; 
    use Drupal\Core\Ajax\InvokeCommand; 
    use Drupal\Core\Form\FormBase; 
    use Drupal\Core\Form\FormStateInterface;

    class AjaxExampleForm extends FormBase{

     * @param array $form
     * @param FormStateInterface $form_state
     * @return array
    public function buildForm(array $form, FormStateInterface $form_state) {

        $form['submit'] = array(
            '#type' => 'button',
            '#value' => 'Login',
            '#attached' => array(
              'library' => array(
            '#ajax' => array(
                'callback' => 'Drupal\ajax_example\Form\AjaxExampleForm::ajaxCallOwn',
                'event' => 'click',
                'progress' => array(
                    'type' => 'throbber',
                    'message' => 'ajaxOwn',

public function ajaxCallOwn(array &$form, FormStateInterface $form_state)
    $ajax_response = new AjaxResponse();

    //$ajax_response->addCommand(new HtmlCommand('#edit-user-name2--description', "changedDessrition!!!!"));

    $ajax_response->addCommand(new InvokeCommand(NULL,'changeDescription'));
    return $ajax_response;



 * @file
 * Contains Drupal\ajax_example\Ajax\AjaxExampleCommand

namespace Drupal\ajax_example\Ajax;

use Drupal\Core\Ajax\CommandInterface;

class AjaxExampleCommand implements CommandInterface{

   * @var string
  protected $blub;
  // Constructs a SystemBlubCommand object.

   * Constructs an SlideDownCommand object.
   * @param string $blub

  public function __construct() {
    $this->blub = "changed!!!!";

  public function render() {
    return array(
      'command' => 'changeDescription',
      'method' => NULL,
      'blub' => $this->blub,


(function ($, Drupal) {

     * Command to Slide Down page elements before removing them.
     * @param {Drupal.Ajax} [ajax]
     * @param {object} response
     * @param {string} response.blub
     * @param {number} [status]

    Drupal.AjaxCommands.prototype.changeDescription = function (ajax, response, status) {



})(jQuery, Drupal);


  version: 1.x
    js/ajaxCustom.js: {}
    - core/drupal
    - core/drupal.ajax
    - core/jquery

Tried so many things like : this with no success

This is the error I get in the Browser:

    Uncaught TypeError: Cannot read property 'apply' of undefined
    at Drupal.AjaxCommands.invoke (ajax.js?v=8.4.4:569)
    at Drupal.Ajax.success (ajax.js?v=8.4.4:407)
    at Object.success (ajax.js?v=8.4.4:222)
    at Object.t.success (jquery.form.min.js?v=3.51:11)
    at i (jquery.min.js?v=3.2.1:2)
    at Object.fireWith [as resolveWith] (jquery.min.js?v=3.2.1:2)
    at A (jquery.min.js?v=3.2.1:4)
    at XMLHttpRequest.<anonymous> (jquery.min.js?v=3.2.1:4)
invoke @ ajax.js?v=8.4.4:569
Drupal.Ajax.success @ ajax.js?v=8.4.4:407
success @ ajax.js?v=8.4.4:222
t.success @ jquery.form.min.js?v=3.51:11
i @ jquery.min.js?v=3.2.1:2
fireWith @ jquery.min.js?v=3.2.1:2
A @ jquery.min.js?v=3.2.1:4
(anonymous) @ jquery.min.js?v=3.2.1:4
XMLHttpRequest.send (async)
send @ jquery.min.js?v=3.2.1:4
ajax @ jquery.min.js?v=3.2.1:4
e.fn.ajaxSubmit @ jquery.form.min.js?v=3.51:11
Drupal.Ajax.eventResponse @ ajax.js?v=8.4.4:316
(anonymous) @ ajax.js?v=8.4.4:255
dispatch @ jquery.min.js?v=3.2.1:3
q.handle @ jquery.min.js?v=3.2.1:3

If I use InvokeCommand error in recent logs:

Deprecated function: call_user_func_array() expects parameter 1 to be a valid callback, non-static method Drupal\ajax_example\Form\AjaxExampleForm2::ajaxCallOwn() should not be called statically in Drupal\Core\Form\FormAjaxResponseBuilder->buildResponse() (line 69 of /Applications/MAMP/htdocs/core/lib/Drupal/Core/Form/FormAjaxResponseBuilder.php) #0 
  • InvokeCommand invokes a jQuery function on the elements, so you'd need $.fn.changeDescription = function(data) { alert(data); };. Otherwise you should use the command you've created: $ajax_response->addCommand(new AjaxExampleCommand());
    – Clive
    Jan 21, 2018 at 15:57
  • Clive beat me to it. Yes you want the PHP class command you made, not InvokeCommand that’s for arbitrary JS function calls.
    – Kevin
    Jan 21, 2018 at 16:00
  • Thanks for your anser, but I still get the error: Uncaught TypeError: Cannot read property 'apply' of undefined Even in another Controller where new AppendCommand works fine. And I alway do: drush cc drush and drush cr This really drives me nuts since 3 days
    – verklixt
    Jan 21, 2018 at 20:47
  • Why is method null and what is “blub”? You can compare it here to a module I wrote: cgit.drupalcode.org/sweetalert/tree
    – Kevin
    Jan 22, 2018 at 1:14
  • Should be 'library' => array('module_name/library_name')), So in your case, since the library name is the same as the module name, 'library' => array('ajax_example/ajax_example')),
    – No Sssweat
    Jan 22, 2018 at 1:57

1 Answer 1


Thanks to No Sssweat, that was the problem!

I thought it should be:

'library' => array('module_name/nameOfJSFile'));

Thanks to Kevin as well, your module sweetalert gave me the right hint.

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