function DependentDropdown::submitForm

Form submission handler.

Parameters

array $form: An associative array containing the structure of the form.

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

Overrides FormInterface::submitForm

File

modules/ajax_example/src/Form/DependentDropdown.php, line 159

Class

DependentDropdown

Re-populate a dropdown based on form state.

Namespace

Code

public function submitForm(array &$form, FormStateInterface $form_state) {
  $trigger = (string) $form_state->getTriggeringElement()['#value'];
  switch ($trigger) {
    case 'Submit':
      // Submit: We're done.
      $this->messenger()
        ->addMessage($this->t('Your values have been submitted. Instrument family: @family, Instrument: @instrument', [
        '@family' => $form_state->getValue('instrument_family_dropdown'),
        '@instrument' => $form_state->getValue('instrument_dropdown'),
      ]));
      return;
  }
  // 'Choose' or anything else will cause rebuild of the form and present
  // it again.
  $form_state->setRebuild();
}