public function EntityAutocomplete::validateForm in Examples for Developers 8

Same name and namespace in other branches

1. 3.x modules/ajax_example/src/Form/EntityAutocomplete.php \Drupal\ajax_example\Form\EntityAutocomplete::validateForm()

Here we validate and signal an error if there are no users selected.

Overrides FormInterface::validateForm

File

ajax_example/src/Form/EntityAutocomplete.php, line 105

Class

EntityAutocomplete

A simple autocomplete form which looks up usernames.

Namespace

Drupal\ajax_example\Form

Code

public function validateForm(array &$form, FormStateInterface $form_state) {
  $state_users = $form_state
    ->getValue('users');
  if (empty($state_users)) {
    $form_state
      ->setErrorByName('users', 'There were no users selected.');
  }
}