public function AutosaveFormBuilder::buildForm in Autosave Form 8

Builds and processes a form for a given form ID.

The form may also be retrieved from the cache if the form was built in a previous page load. The form is then passed on for processing, validation, and submission if there is proper input.

Parameters

\Drupal\Core\Form\FormInterface|string $form_arg: The value must be one of the following:

The name of a class that implements \Drupal\Core\Form\FormInterface.
An instance of a class that implements \Drupal\Core\Form\FormInterface.

\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.

Return value

array The rendered form. This function may also perform a redirect and hence may not return at all depending upon the $form_state flags that were set.

Throws

\Drupal\Core\Form\FormAjaxException Thrown when a form is triggered via an AJAX submission. It will be handled by \Drupal\Core\Form\EventSubscriber\FormAjaxSubscriber.

\Drupal\Core\Form\EnforcedResponseException Thrown when a form builder returns a response directly, usually a \Symfony\Component\HttpFoundation\RedirectResponse. It will be handled by \Drupal\Core\EventSubscriber\EnforcedFormResponseSubscriber.

Overrides FormBuilder::buildForm

File

src/Form/AutosaveFormBuilder.php, line 96

Class

AutosaveFormBuilder: Provides form building and processing with AutosaveForm enabled.

Namespace

Drupal\autosave_form\Form

Code

public function buildForm($form_id, FormStateInterface &$form_state) {
  $form = parent::buildForm($form_id, $form_state);
  if ($form_state::hasAnyErrors()) {

    // Under circumstances it might happen that the form is submitted but
    // returned with validation errors and the form alter hooks are executed
    // thus leading to the autosave form alter code being executed as well and
    // putting the autosave resume/discard message to the form, which should
    // not happen if the form is being returned to the browser with validation
    // errors. In order to prevent this we have to add the resume/discard
    // message and options only on HTTP GET requests or on POST requests if
    // restore or reject submit operations have been performed or in a more
    // complex case if the message has not been yet confirmed but other
    // AJAX / POST requests are being triggered in the background. As we could
    // not detect the last case we still put the form elements into the form,
    // but on the client side we will not show the message if the form is
    // returned with validation errors.
    $form['#attached']['drupalSettings']['autosaveForm']['formHasErrors'] = TRUE;

    // Additionally unset the form elements and settings which might have been
    // added, but aren't actually needed.
    unset($form['#attached']['drupalSettings']['autosaveForm']['message']);
    unset($form[AutosaveFormInterface::AUTOSAVE_RESTORE_ELEMENT_NAME]);
    unset($form[AutosaveFormInterface::AUTOSAVE_REJECT_ELEMENT_NAME]);
    unset($form['autosave_restore_discard']);
  }
  return $form;
}

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