jak renderovat ve smycce?

Zdravim,
mam formular kde nad vybranou polozkou spoustim cyklus casove narocnejsich operaci a vysledek se zobrazi az po dokonceni cyklu.
Rad bych zobrazil uzivateli info po dokonceni kazde iterace. Myslel jsem si, ze v sablone pouziju snippet a v nem vypisu result ale takto mi to nefunguje.

protected function createComponentForm() {
                $form = new UI\Form;
                $form->addSelect( 'router_id', '')->setItems($this->routerManager->getRouters([2]))->setPrompt('Vyber:');
                $form->addSubmit('send', 'OK');

                $form->onSuccess[] = function(UI\Form $form) {
                    $values = $form->getValues(TRUE);
                    $list = $this->routerManager->getListFromRouter($values['router_id']);
                    foreach($list as $a){
                        $this->template->result = $this->routerManager->add($a);
							$this->redrawControl('snippetResult');
                    }
                };
                $form->setRenderer(new \Nextras\Forms\Rendering\Bs3FormRenderer());
                return $form;
}

{snippet snippetResult}
    {$result}
{/snippet}