FRONT_END:

 <div class="cart__amount tpl-block-cardbox-amount">

<span class="info__label">Кол-во:</span>

<div id="choice<?=$item['Message_ID']?>" class="b-amount tpl-block-amountchoice">

<span class="amount__button tpl-block-amountchoice-button tpl-block-amountchoice-button--less">-</span>

 <span class="tpl-block-amountchoice-value">

<input type="hidden" name="qty" data="<?=$item['Message_ID']?>" value="<?= $item['Qty']; ?>"/>

<span class="amount__num"><?= $item['Qty']; ?></span></span>

<span class="amount__button tpl-block-amountchoice-button tpl-block-amountchoice-button--more">+</span>

 </div>

 </div>

					

											<script>

$(function(){

									$('.amount__button').click( function(){

item = '#'+$(this).parent('div').attr('id');			   



													   $.post('/', {

													   's_action':'Cart', 

													   'item':$(item).find('input').attr('data'), 

													   'qty':$(item).find('input').val(), 

													   'json': 1,

													   }, 

													   

													   function(data){    



														$('.cart__price-amount').text(data.TotalItemPrice);



														} 

													   , 'json');

															

	});	

});

</script>











BACK_END:

<?php

error_reporting(E_ALL^E_NOTICE);

header('Content-Type: text/html; charset=utf-8');





if($_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest' && $_POST) {



	include_once ($NETCAT_FOLDER."vars.inc.php");

    require $INCLUDE_FOLDER . "e404.php";

   

    $netshop = nc_netshop::get_instance();





	       $netshop->cart->add_item(520, $_POST['item'], $_POST['qty']+1, 1, null);	

    

    $total_price = $netshop->cart->get_totals();

    $data = array(

        'TotalItemPrice' => $total_price,



    );

 ob_end_clean();

    echo nc_array_json($data);

    exit;



	

}



?>