contech/test.html at master · Rachael97/contech · GitHub

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<script>

var cart;

		// 让localStorage define cart 的存在
		if(localStorage.accessoryCart!=null) {
			cart = JSON.parse(localStorage.accessoryCart);
		} else {
			cart = [];
		}

    //var cart = localStorage.accessoryCart!=null?JSON.parse(localStorage.accessoryCart):[];

		function addCart(title, price, img) {
		//console.log(title, price, img);

		// step1: 做array
		/*  var cart = [];
			cart = ["iphone 6", "iphone 7", "samsung S7", "samsung S7 edge"]
			//console.log (cart[]);  */
			// *** 最后要宣布 var cart; instead of var cart = [], 不然function run一次，cart 就变[]again!!!

		// step2: 做object
		/*  var myProduct = {};
			zmyProduct = {"title":title, "price":price, "img":img, "qty":qty}  */

		// step3: 把{object} push进 [array] means 把{myProduct} push进 [cart]

			var myProduct = {};

		// determine product exist or not
			var productExist = false;
			var selectedIndex = 0;
			for (var i=0; i < cart.length; i++){
				if (cart[i].title == title){
					productExist = true;
					selectedIndex = i;
					break;
				}
			}

		// if product alr exist in cart
			if (productExist == true) {
				cart[selectedIndex].qty++ ;

		// if product not exist in cart
			} else {
				var id = cart.length+1;

			myProduct = {"id":id, "title":title, "price":price, "img":img, "qty":1};

			cart.push(myProduct);

			}

		console.log(cart);

		calculateTotalPrice();

		}

		function calculateTotalPrice() {
			var total = 0;

			$("#accessoryCart").html('');
			for (var i=0; i < cart.length; i++) {
				subtotal = cart[i].price * cart[i].qty;
				total += subtotal;

			var tr = "";
			tr += '<td> '+cart[i].title+' </td>';
			tr += '<td><a href="javascript:minusCart('+cart[i].id+');" class="btn btn-xs btn-danger">-</a> '+cart[i].qty+' <a href="javascript:plusCart('+cart[i].id+')" class="btn btn-xs btn-danger">+</a></td>';
			tr += '<td> '+cart[i].price+' </td>';
			tr += '<td> '+subtotal+' </td>';
			tr += '<td><a href="javascript:deleteCart('+cart[i].id+')" class="btn btn-primary btn-xs"><i class="glyphicon glyphicon-trash"></i></a></td>';

			 var trDOM = $("<tr>").html(tr);
			$("#accessoryCart").append(trDOM);

			}

			 //to put total in between <td id="myTotal"> and </td>
			$("#myTotal").html(total);

		localStorage.accessoryCart = JSON.stringify(cart);

		}

</script>


<script>

		var cart;

			if(localStorage.accessoryCart!=null) {
			cart = JSON.parse(localStorage.accessoryCart);
			} else {
				cart = [];
			}

			var myAccessory = {};

			function addCart (title,code,price,img) {
			//console.log(title, code, price, img);

			//define product exist or not
				var accessoryExist = false;
				var selectedIndex = 0;

				for (var i=0; i < cart.length; i++) {
					if (cart[i].code == code) {
						accessoryExist = true;
						selectedIndex = i;
						break;
					}
				}

				if (accessoryExist = true) {

					cart[selectedIndex].qty++;

				} else {

					var id = cart.length+1;

					myAccessory = {"id":id, "title":title, "code":code, "price":price, "img":img, "qty":1};
					cart.push(myAccessory);
				}

			console.log(cart);

			calculateTotalPrice();
			}

			function calculateTotalPrice() {

				var total = 0;
				$('#accessoryCart').html('');

				for (i=0; i < cart.length; i++) {
					subtotal = cart[i].price * cart[i].qty;
					total += subtotal;

				var tr = "";
				tr += '<td>' +cart[i].title+ '</td>';
				tr += '<td>' +cart[i].code+ '</td>';
				tr += '<td>' +cart[i].qty+ '<td>';
				tr += '<td>' +cart[i].price+ '<td>';
				tr += '<td>' +subtotal+ '<td>';
				tr += '<td>' +cart[i].id+ '<td>';

				var trDom = $("<tr>").html(tr);
				$ ('#accessoryCart').append(trDom);

				}

				$("#myTotal").html(total);

			localStorage.accessoryCart = JSON.stringify(cart);

			}

</script>