function DependentDropdown::submitForm

Same name in other branches
  1. 3.x modules/ajax_example/src/Form/DependentDropdown.php \Drupal\ajax_example\Form\DependentDropdown::submitForm()
  2. 8.x-1.x ajax_example/src/Form/DependentDropdown.php \Drupal\ajax_example\Form\DependentDropdown::submitForm()

Overrides FormInterface::submitForm

File

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

Class

DependentDropdown
Re-populate a dropdown based on form state.

Namespace

Drupal\ajax_example\Form

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();
}