Ovlivneni komponenty ajaxove z presenteru

Zdravim!
Resim pokladni presenter, ve kterem je seznam drinku, pro kazdy drink nekolik checkboxu pro jednoltive objemy drinku. Pri kliknuti na checkbox se komponenta ajaxove odesle a zobrazi se input pro navoleni mnozsvi drinku daneho objemu a input zobrazujici cenu. (toto cele je jedna komponenta).

ted se pokousim k tomu pridat slevu – pokladni muze zvolit pomoci radiobuttonu slevu. Sleva uz je normalni form v presenteru. Idea je takova, ze po kliknuti na slevu se slevovy form ajaxove odesle ke zpracovani nejakemu signalu kompomenty a ten prekresli ceny v inputech.

Toho se mi zatim nepodarilo dosahnout, komponenta se mi vzdy „vynuluje“ navolena data v ni nezustanou.

Asi by to slo vyresit pridanim volby slevy do komponenty, ale logicky to tam nepatri a nechci to tam motat. Nejaky rady?
Prikladam kod relevantni komponenty a ukazku sablony, jak ajaxove odesilam

public function handleUpdateSleva(MyForm $form) {
	$sleva = $form['sleva']->getValue();
	if ((0 <= $sleva) and ($sleva <= 100)) {
	    $this->sleva = $sleva;
	}
	else {
	    throw new InvalidArgumentException("Sleva musi byt v rozmezi 0 - 100.");
	}
	$this->sleva = $sleva;
	$this->invalidateControl('vybraneDrinky');
    }


    public function render() {
	$this->template->setFile(__DIR__ . '/objednavka.latte');
	$this->template->form = $this['objednavkaForm'];
	$this->fillForm();
	$this->template->drinky = $this->getDrinky();
	$this->template->objemy = Drink::$objemySelect;
	$this->template->zobrazit = $this->polozky;

	$this->template->render();
    }

    private function fillForm() {
	$sum = 0;
	foreach ($this->polozky as $polozka) {
	    $arr = explode("_", $polozka);
	    $drink = $this->em->find('Drink', $arr[0]);
	    $cena = $drink->getCenaZaObjem($arr[1]);
	    $mnozstvi = 1;
	    if (isset($this->formData['radky'][$polozka])) {
		$mnozstvi = $this->formData['radky'][$polozka]['mnozstvi'];
	    }

	    $this['objednavkaForm']['radky'][$polozka]['cena']->setValue($cena*$mnozstvi*(1-$this->sleva/100));
	    $this['objednavkaForm']['radky'][$polozka]['mnozstvi']->setValue($mnozstvi);
	    $sum += $cena*$mnozstvi;
	}
	$this['objednavkaForm']['soucetContainer']['soucet']->setValue($sum);
    }

    private function getDrinky() {
	if ($this->drinky == NULL)
	    $this->drinky = $this->em->getRepository('Drink')->findAll();
	return $this->drinky;
    }

    public function createComponentObjednavkaForm() {
	$form = new MyForm;
	$form->getElementPrototype()->class = 'drinkyForm';

	$drinky = $form->addContainer('vybraneDrinky');
	$radky = $form->addContainer('radky');
	foreach ($this->getDrinky() as $drink) {
	    foreach (Drink::$objemySelect as $objem => $mnozstvi) {
		$key = $drink->id . '_' . $objem;
		$drinky->addCheckbox($key, $drink->getCenaZaObjem($objem))->setAttribute('class', 'vyberDrinku');
		$radek = $radky->addContainer($key);
		$radek->addText('cena', 'Cena')
			->setAttribute('readonly', 'readonly');
		$radek->addText('mnozstvi', $drink->nazev . ' ' . \Drink::$objemySelect[$objem])
			 ->setAttribute('class', 'mnozstviDrinku');
	    }
	}

	$form->addContainer('soucetContainer');
	$form['soucetContainer']->addText('soucet', 'Celková částka');
	$form->addSubmit('ok', 'Odeslat');
	$form->onSuccess[] = callback($this, 'ObjednavkaFormSubmitted');

	return $form;
    }

    public function ObjednavkaFormSubmitted($form) {
	if ($this->getPresenter()->isAjax()) {
	    $data = $form->getHttpData();
	    $this->formData = $data;
	    foreach ($data['vybraneDrinky'] as $key => $value) {
		$this->polozky[] = $key;
	    }
	    $this->invalidateControl('vybraneDrinky');
	}


    }

$('.vyberDrinku').live('change', function(){
	var form = $(this).closest('form');

	$.nette.ajax({
	    type: 'POST',
	    url: form.attr('action'),
	    data: form.serialize(),

	});

	return false;
    });