Stores the gathered submission handlers. This property is uncacheable. Type:

protected static FormHelper::processStatesArray(array &$conditions, $search

Provides helpers to operate on forms. Hierarchy class \Drupal\Core\Form\

public BrokenPostRequestException::

public FormBuilder::getCache($form_build_id, FormStateInterface $form_state)

The element info manager. Type:

Provides an interface for processing form submissions. Hierarchy interface \Drupal\Core\Form\

public static FormElementHelper::getElementByName($name, array $form)

public FormStateDecoratorBase::clearErrors()

Provides common functionality for form elements. Hierarchy class \Drupal\Core\Form\