What I'm trying to do is to invoke some javascript after a webform is successfully submitted by ajax.

To do that I followed this advice and created an EventSubscriber to intercept ajax response and add my custom command there. The problem is that on some reason I can't check if the webform is submitted (data are sent) or not.

  public function onResponse(FilterResponseEvent $event) {
    if($event->getResponse() instanceof WebformSubmissionAjaxResponse &&
       $event->getResponse()->getWebformSubmission()->isCompleted()) {
         $event->getResponse()->addCommand(new MyCustomCommand());

The problem is in isCompleted() method which always returns false on some reason. Actually I checked other methods from WebformSubmissionInterface and in this my event subscriber this WebformSubmission entity always looks empty (getters return nothing) and geState() always returns "STATE_UNSAVED" not depending if a webform is successfully sent of failed on validation.

What I'm missing? Is anything I'm doing wrong here? Or maybe are there any other method to achive same goal?

1 Answer 1


I had this same issue, what worked for me was under webform settings > Confirmation > Confirmation Type. Change the confirmation type to 'Inline (reloads the current page and replaces the webform with the confirmation message)'

This returned true for $event->getResponse()->getWebformSubmission()->isCompleted()

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