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drupal 8 webform hook validation
Disturbed Dove
on Mar 18, 2021
namespace Drupal\custom_module\Validate;
use Drupal\Core\Field\FieldException;
use Drupal\Core\Form\FormStateInterface;
/**
* Form API callback. Validate element value.
*/
class MyValidateConstraint {
/**
* Validates given element.
*
* @param array $element The form element to process.
* @param FormStateInterface $formState The form state.
* @param array $form The complete form structure.
*/
public static function validate(array &$element, FormStateInterface $formState, array &$form) {
$webformKey = $element['#webform_key'];
$value = $formState->getValue($webformKey);
// Skip empty unique fields or arrays (aka #multiple).
if ($value === '' || is_array($value)) {
return;
}
// do some validation here...
// and set some error variable, e.g. $error
if ($error) {
if (isset($element['#title'])) {
$tArgs = [
'%name' => empty($element['#title']) ? $element['#parents'][0] : $element['#title'],
'%value' => $value,
];
$formState->setError(
$element,
t('The value %value is not allowed for element %name. Please use a different value.', $tArgs)
);
} else {
$formState->setError($element);
}
}
}
}
Source: www.drupal.org
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