I’ve been fighting with this for a long time but then I found simple solution.
I needed to redirect to new batch processing page right after clicking submit button so here is a solution
public function submitForm(array &$form, FormStateInterface $form_state) {
$form_state->setRedirectUrl(Url::fromUri())
$identity = isset($form_state->getTriggeringElement()['#identity']) ? $form_state->getTriggeringElement()['#identity'] : 'unknown';
switch ($identity) {
case static::BTN_UPDATE;
$batch = [
'title' => t('Updating'),
'operations' => [
array('sfo_common_batch_callbacks__taxonomy_update_cache_process', [[]]),
],
'finished' => 'sfo_common_batch_callbacks__taxonomy_update_cache_finished',
'file' => drupal_get_path('module', 'sfo_common') . '/include/batch/sfo_common.taxonomy_cache.inc',
];
batch_set($batch);
$request = batch_process(static::URL_REDIRECT);
return $request->send();
break;
default:
drupal_set_message(t('Incorrect operation'));
break;
}
}
This is the usecase I found. But this is only works great for batch. If you need to redirect after form submit it is also possible to use
public function submitForm(array &$form, FormStateInterface $form_state) {
$form_state->setRedirect(taxonomy.vocabulary.collection); // Here need to pass route name from *.routes.yml file
//But if you need to redirect to custom url
$form_state->setRedirectUrl(Url::fromUri('http://google.com')); // Need to pass Drupal\Core\Url object here
}
Other ways to redirect https://www.drupal.org/node/2023537
