public WidgetBase::errorElement(array $element, ConstraintViolationInterface $error, array $form, FormStateInterface $form_state)
Assigns a field-level validation error to the right widget sub-element.
Depending on the widget's internal structure, a field-level validation error needs to be flagged on the right sub-element.
array $element: An array containing the form element for the widget, as generated by formElement().
\Symfony\Component\Validator\ConstraintViolationInterface $violation: A constraint violation reported during the validation phase.
array $form: The form structure where field elements are attached to. This might be a full form structure, or a sub-element of a larger form.
\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.
array|bool The element on which the error should be flagged, or FALSE to completely ignore the violation (use with care!).
Overrides WidgetInterface::errorElement
public function errorElement(array $element, ConstraintViolationInterface $error, array $form, FormStateInterface $form_state) { return $element; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!WidgetBase.php/function/WidgetBase::errorElement/8.1.x