Ajax binding to controller for response in magento.

Magentoajax.php

/**
 * adding cologne bundle to cart
 * @return json response
 */
public function addtocartAction() {
    $productId = Mage::app()->getRequest()->getParam('productId');
    $options = Mage::app()->getRequest()->getParam('options');

        try {
            $params = array(
                'product' => $productId,
                'related_product' => null,
                'bundle_option' => $options,
                'qty' => 1,
            );

            $cart = Mage::getModel('checkout/cart');

            $product = new Mage_Catalog_Model_Product();
            $product->load($productId);

            $cart->addProduct($product, $params);
            $cart->save();

            Mage::getSingleton('checkout/session')->setCartWasUpdated(true);

            Mage::dispatchEvent('checkout_cart_add_product_complete',
                array('product' => $product, 'request' => $this->getRequest(), 'response' => $this->getResponse())
            );

            $totalItemsInCart = Mage::helper('checkout/cart')->getCart()->getItemsCount();
            // print($totalItemsInCart);
            $response['cartitemqty'] = $totalItemsInCart;

            $response['status'] = true;
            $response['errorsign'] = 0;
        } catch (Mage_Core_Exception $e) {
            $response['errorsign'] = 2;
            $response['activitymessage'] = $e->getMessage();
        } catch (Exception $e) {
            $response['errorsign'] = 2;
            $response['activitymessage'] = $e->getMessage();
        }
    // }

    $this->getResponse()->setBody(Mage::helper('core')->jsonEncode($response));
    return;
}

myscript.js

/** add the final formed bundle to cart to complete the process */
$(document.body).on("click", "#addToCartCologneGifts", function() {
	$(this).addClass('in-progress');
	$(this).addClass('disabled_ajax');
	_.each(bundleArray, function(value, key) {
		var cologneAddToCart = baseUrl+'cologne/index/addtocart';
		jQuery.ajax({
			url: cologneAddToCart,
			dataType: 'json',
			type: 'POST',
			data: {
				'productId' : key,
				'options' : value
			},
			success: function(response){
				$('#addToCartCologneGifts').removeClass('in-progress');
				$('#addToCartState').text('Added To Cart')
				$('.cart_count').text(response.cartitemqty)
				$('#cologneFinalState').fadeIn();
			},
		});
	});
});

view.phtml

<div class="col-sm-12 col-xs-12 text-center cologne_continue">
	<a id="addToCartCologneGifts" class="col-sm-5 btn btn-primary">
		<div class="col-sm-2 col-xs-3 rupee"><span class="WebRupee">`</span><span class="totalPrice"> 0</span></div>
          <div id="addToCartState" class="col-sm-9 col-xs-9"><span class="cologne_continue_text">Add to cart</span><span class="pull-right moz-pull-right-margin"> <i class="fa fa-chevron-right faa-horizontal animated"></i> </span></div>
      </a>
</div>

ajax communication client server through javascript