Validation callback for a datetime element.

If the date is valid, the date object created from the user input is set in the form for use by the caller. The work of compiling the user input back into a date object is handled by the value callback, so we can use it here. We also have the raw input available for validation testing.

Parameters

array $element: The form element whose value is being validated.

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

array $complete_form: The complete form structure.

File

core/tests/Drupal/KernelTests/Components/ComponentAsFormElementTest.php, line 158

Class

ComponentAsFormElementTest

Tests the correct rendering of components in form.

Namespace

Drupal\KernelTests\Components

Code

public static function customValidator(&$element, FormStateInterface $form_state, &$complete_form) : void {
  $input_exists = FALSE;
  $input = NestedArray::getValue($form_state->getValues(), $element['#parents'], $input_exists);
  // Example: Only allow 'test_data_valid_value' as valid.
  if ($input !== "test_data_valid_value") {
    $form_state->setError($element, "Invalid value provided.");
  }
}

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