Clear form fields after AJAX submit

Given:

  • I am using Drupal 8.
  • I have a custom “add form” of the custom entity type.
  • Form has an ajax submission.

Problem:

  • When I submit form all the values remain in fields.

Expected:

  • Form fields should be cleared after submission.

Form source code:

<?php  namespace DrupalmymoduleForm;  use DrupalCoreEntityContentEntityForm; use DrupalCoreFormFormStateInterface;  /**  * Form controller for the add/edit entity forms.  */ class MymoduleForm extends ContentEntityForm {    /**    * {@inheritdoc}    */   public function buildForm(array $form, FormStateInterface $form_state) {     $form = parent::buildForm($form, $form_state);      $form['#prefix'] = "<div id="{$this->getFormId()}-wrapper">";     $form['#suffix'] = '</div>';      $form['actions']['submit']['#ajax'] = [       'wrapper' => $this->getFormId() . '-wrapper',       'callback' => array($this, 'ajaxRebuildCallback'),       'effect' => 'fade',     ];      return $form;   }    /**    * Callback for ajax form submission.    *    * @param array $form    *   An associative array containing the structure of the form.    * @param DrupalCoreFormFormStateInterface $form_state    *   The current state of the form.    *    * @return array    *   The rebuilt form.    */   public function ajaxRebuildCallback(array $form, FormStateInterface $form_state) {     drupal_set_message(t('Entity was successfully created'));      // @todo Clear form values.     //$form_state->setRebuild(TRUE);     //$form_state->setValues([]);     /*$entity = Drupal::entityTypeManager()->getStorage('liveblog_post')->create([]);     $form_object = Drupal::entityTypeManager()       ->getFormObject('liveblog_post', 'add')       ->setEntity($entity);*/     //$new_form_state = new FormState();     //$form = Drupal::formBuilder()->rebuildForm($this->getFormId(), $form_state);      return $form;   }    /**    * {@inheritdoc}    */   public function save(array $form, FormStateInterface $form_state) {     $entity = $this->getEntity();     $entity->save();   }  } 

P.S. you can find my attempts in the ajaxRebuildCallback() method.

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