Witam,
Próbuję zrobić koszyk na zakupy. Znalazłem tutaj gotowy: http://www.webresourcesdepot.com/drag-n-drop-shopping-cart-with-jquery-ui-tutorial/
Teraz próbuję dopisać przeliczenie kosztu zawartości w koszyku. Przeciągam ipada do koszyka, ale koszt cały czas wyświetla 0.

	  function przeliczKoszyk(){
	var suma= 0;
	var i = 0; 	
	var przesylka = 0;
    $('#basket ul li').each(function () {
		suma = suma + parseInt($(this).attr('cena'));
		i++;
	});
	$('#basketValue').text(suma);
	if(i == 1) {
		przesylka = suma*10/100;
	} else if (i > 1 && i <= 2) {
		przesylka = suma*15/100;
	} else {
		przesylka = suma*20/100;
	}
	$('#transportCost').text(przesylka);
   }

   
  </script>
 
        <section id="product">
            <ul class="clear">
               ** <li cena="1000" data-id="1">**
                    <a href="#">
                        <img src="http://lorempixel.com/150/100/technics/1/" alt="">
                        <h3>iPad 32gb retina screen</h3>
                        <p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
                        
                    </a>
                </li>
                <li data-id="2">
                    <a href="#">
                        <img src="http://lorempixel.com/150/100/technics/2/" alt="">
                        <h3>Turntable mixer</h3>
                        <p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
                    </a>
                </li>
                <li data-id="3">
                    <a href="#">
                        <img src="http://lorempixel.com/150/100/technics/3/" alt="">
                        <h3>IBM 15" super-fast computer</h3>
                        <p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
                    </a>
                </li>
                <li data-id="4">
                    <a href="#">
                        <img src="http://lorempixel.com/150/100/technics/4/" alt="">
                        <h3>Some crazy circuit</h3>
                        <p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
                    </a>
                </li>
                <li data-id="5">
                    <a href="#">
                        <img src="http://lorempixel.com/150/100/technics/5/" alt="">
                        <h3>White earpieces</h3>
                        <p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
                    </a>
                </li>
                <li data-id="6">
                    <a href="#">
                        <img src="http://lorempixel.com/150/100/technics/6/" alt="">
                        <h3>Headphones with free keyboard</h3>
                        <p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
                    </a>
                </li>
                <li data-id="7">
                    <a href="#">
                        <img src="http://lorempixel.com/150/100/technics/7/" alt="">
                        <h3>iPhone 4S</h3>
                        <p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
                    </a>
                </li>
                <li data-id="8">
                    <a href="#">
                        <img src="http://lorempixel.com/150/100/technics/8/" alt="">
                        <h3>Another crazy circuit or..</h3>
                        <p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
                    </a>
                </li>
            </ul>
        </section> 
 
    <script>
        $(function () {

            // jQuery UI Draggable
            $("#product li").draggable({

                // brings the item back to its place when dragging is over
                revert: true,

                // once the dragging starts, we decrease the opactiy of other items
                // Appending a class as we do that with CSS
                drag: function () {
                    $(this).addClass("active");
                    $(this).closest("#product").addClass("active");
                },

                // removing the CSS classes once dragging is over.
                stop: function () {
                    $(this).removeClass("active").closest("#product").removeClass("active");
                }
            });

            // jQuery Ui Droppable
            $(".basket").droppable({

                // The class that will be appended to the to-be-dropped-element (basket)
                activeClass: "active",

                // The class that will be appended once we are hovering the to-be-dropped-element (basket)
                hoverClass: "hover",

                // The acceptance of the item once it touches the to-be-dropped-element basket
                // For different values http://api.jqueryui.com/droppable/#option-tolerance
                tolerance: "touch",
                drop: function (event, ui) {

                    var basket = $(this),
                            move = ui.draggable,
                            itemId = basket.find("ul li[data-id='" + move.attr("data-id") + "']");

                    // To increase the value by +1 if the same item is already in the basket
                    if (itemId.html() != null) {
                        itemId.find("input").val(parseInt(itemId.find("input").val()) + 1);
                    }
                    else {
                        // Add the dragged item to the basket
                        addBasket(basket, move);

                        // Updating the quantity by +1" rather than adding it to the basket
                        move.find("input").val(parseInt(move.find("input").val()) + 1);
                    }
                }
            });

            // This function runs onc ean item is added to the basket
            function addBasket(basket, move) {
                basket.find("ul").append('<li data-id="' + move.attr("data-id") + '">'
                        + '<span class="name">' + move.find("h3").html() + '</span>'
                        + '<input class="count" value="1" type="text">'
                        + '<button class="delete">&#10005;</button>');
                przeliczKoszyk();
            }


            // The function that is triggered once delete button is pressed


            $('body').on("click", 'button.delete', function (event) {
                $(this).closest('li').remove();
            });

        });

        function przeliczKoszyk() {
            var suma = 0;
            var i = 0;
            var przesylka = 0;
            $('#basket ul li').each(function () {
                suma = suma + parseInt($(this).attr('cena'));
                i++;
            });
            $('#basketValue').text(suma);
            if (i == 1) {
                przesylka = suma * 10 / 100;
            } else if (i > 1 && i <= 2) {
                przesylka = suma * 15 / 100;
            } else {
                przesylka = suma * 20 / 100;
            }
            $('#transportCost').text(przesylka);
        }
    </script>