我有一个简单的问题。当我将产品添加到购物车并再次将相同的产品添加到购物车时,它会添加另一行。它应该只是增加它的数量。希望得到你的答案。这对我来说是一个很大的帮助。请仅使用纯JAVASCRIPT。没有JQUERY。谢谢你们。
//var qtyTotal = 0;
//var priceTotal = 0;
var products = [];
function addProduct() {
var productID = document.getElementById("productID").value;
var product_desc = document.getElementById("product_desc").value;
var qty = document.getElementById("quantity").value;
// qtyTotal = qtyTotal + parseInt(qty);
//document.getElementById("qtyTotals").innerHTML=qtyTotal;
var price = document.getElementById("price").value;
var newProduct = {
product_id : null,
product_desc : null,
product_qty : 0,
product_price : 0.00,
};
newProduct.product_id = productID;
newProduct.product_desc = product_desc;
newProduct.product_qty = qty;
newProduct.product_price = price;
products.push(newProduct);
//console.log("New Product " + JSON.stringify(newProduct))
//console.log("Products " + JSON.stringify(products))
var html = "<table border='1|1' >";
html+="<td>Product ID</td>";
html+="<td>Product Description</td>";
html+="<td>Quantity</td>";
html+="<td>Price</td>";
html+="<td>Action</td>";
for (var i = 0; i < products.length; i++) {
html+="<tr>";
html+="<td>"+products[i].product_id+"</td>";
html+="<td>"+products[i].product_desc+"</td>";
html+="<td>"+products[i].product_qty+"</td>";
html+="<td>"+products[i].product_price+"</td>";
html+="<td><button type='submit' onClick='deleteProduct(\""+products[i].product_id +"\", this);'/>Delete Item</button>   <button type='submit' onClick='addCart(\""+products[i].product_id +"\", this);'/>Add to Cart</button></td>";
html+="</tr>";
}
html+="</table>";
document.getElementById("demo").innerHTML = html;
document.getElementById("resetbtn").click()
}
function deleteProduct(product_id, e) {
e.parentNode.parentNode.parentNode.removeChild(e.parentNode.parentNode);
for(var i = 0; i < products.length; i++) {
if (products[i].product_id == product_id) {
// DO NOT CHANGE THE 1 HERE
products.splice(i, 1);
}
}
}
function addCart(product_id){
var html = '';
var ele = document.getElementById("demo2");
if(ele.innerHTML == '')
{
html+="<table id='tblCart' border='1|1'>";
html+="<tr><td>Product ID</td>";
html+="<td>Product Description</td>";
html+="<td>Quantity</td>";
html+="<td>Price</td>";
html+="<td>Total</td>";
html+="<td>Action</td></tr>";
}
for (var i = 0; i < products.length; i++) {
if (products[i].product_id == product_id) {
products[i].product_qty = parseInt(products[i].product_qty) + 1;
html+="<tr>";
html+="<td>"+products[i].product_id+"</td>";
html+="<td>"+products[i].product_desc+"</td>";
html+="<td>"+products[i].product_qty+"</td>";
html+="<td>"+products[i].product_price+"</td>";
html+="<td>"+parseInt(products[i].product_price)*parseInt(products[i].product_qty)+"</td>";
html+="<td><button type='submit' onClick='subtractQuantity(\""+products[i].product_id +"\", this);'/>Subtract Quantity</button></td>";
html+="</tr>";
}
}
if(ele.innerHTML == '')
{
html+= "</table>";
ele.innerHTML = html;
}
else
{
document.getElementById("tblCart").innerHTML += html;
}
}
function subtractQuantity(product_id)
{ alert(product_id);
for(var i = 0; i < products.length; i++) {
if (products[i].product_id == product_id & products[i].product_qty >= 1) {
products[i].product_qty = parseInt(products[i].product_qty) - 1;
}
if (products[i].product_id == 0) {
removeItem(products[i].product_id);
}
console.log("Products " + JSON.stringify(products));
}
}
function removeItem(product_id) {
for(var i = 0; i < products.length; i++) {
if (products[i].product_id == product_id) {
// DO NOT CHANGE THE 1 HERE
products.splice(i, 1);
}
}
}
&#13;
<!DOCTYPE html>
<html>
<head>
<title>Shopping Cart Pure Javascript</title>
</head>
<body>
<form name="order" id="order">
<table>
<tr>
<td>
<label for="productID">Product ID:</label>
</td>
<td>
<input id="productID" name="product" type="text" size="28" required/>
</td>
</tr>
<tr>
<td>
<label for="product">Product Desc:</label>
</td>
<td>
<input id="product_desc" name="product" type="text" size="28" required/>
</td>
</tr>
<tr>
<td>
<label for="quantity">Quantity:</label>
</td>
<td>
<input id="quantity" name="quantity" width="196px" required/>
</td>
</tr>
<tr>
<td>
<label for="price">Price:</label>
</td>
<td>
<input id="price" name="price" size="28" required/>
</td>
</tr>
</table>
<input type="reset" name="reset" id="resetbtn" class="resetbtn" value="Reset" />
<input type="button" id="btnAddProduct" onclick="addProduct();" value="Add New Product" >
</form>
<br>
<p id="demo"></p> <br/>
<h2> Shopping Cart </h2>
<p id="demo2"></p>
</body>
</html>
&#13;
答案 0 :(得分:1)
首先,您尝试将产品和购物车商品存储在相同阵列中。购物车应包含产品实例,而不是相反。
其次,你继续添加你的html表而不会带走前一行(对于同一产品)。
第三,您将价格变量转换为整数,货币值应始终为浮动或双倍。
我假设您在寻找类似以下内容的地方:
var products = [];
var cart = [];
function addProduct() {
var productID = document.getElementById("productID").value;
var product_desc = document.getElementById("product_desc").value;
var qty = document.getElementById("quantity").value;
var price = document.getElementById("price").value;
var newProduct = {
product_id: null,
product_desc: null,
product_qty: 0,
product_price: 0.00,
};
newProduct.product_id = productID;
newProduct.product_desc = product_desc;
newProduct.product_qty = qty;
newProduct.product_price = price;
products.push(newProduct);
var html = "<table border='1|1' >";
html += "<td>Product ID</td>";
html += "<td>Product Description</td>";
html += "<td>Quantity</td>";
html += "<td>Price</td>";
html += "<td>Action</td>";
for (var i = 0; i < products.length; i++) {
html += "<tr>";
html += "<td>" + products[i].product_id + "</td>";
html += "<td>" + products[i].product_desc + "</td>";
html += "<td>" + products[i].product_qty + "</td>";
html += "<td>" + products[i].product_price + "</td>";
html += "<td><button type='submit' onClick='deleteProduct(\"" + products[i].product_id + "\", this);'/>Delete Item</button>   <button type='submit' onClick='addCart(\"" + products[i].product_id + "\", this);'/>Add to Cart</button></td>";
html += "</tr>";
}
html += "</table>";
document.getElementById("demo").innerHTML = html;
document.getElementById("resetbtn").click()
}
function deleteProduct(product_id, e) {
e.parentNode.parentNode.parentNode.removeChild(e.parentNode.parentNode);
for (var i = 0; i < products.length; i++) {
if (products[i].product_id == product_id) {
// DO NOT CHANGE THE 1 HERE
products.splice(i, 1);
}
}
}
function addCart(product_id) {
//Indentify the product and add it to new "cart" array
for (var i = 0; i < products.length; i++) {
if (products[i].product_id == product_id) {
var cartItem = null;
for (var k = 0; k < cart.length; k++) {
if (cart[k].product.product_id == products[i].product_id) {//Already exists in cart, increment quantity.
cartItem = cart[k];
cart[k].product_qty++;//Increment by one only, as requested.
break;
}
}
if (cartItem == null) {
//Every item in the cart specifies the product in question as well as how many of the product there is in the cart, starts off at product's quantity
var cartItem = {
product: products[i],
product_qty: products[i].product_qty // Start of at product's quantity
};
cart.push(cartItem);
}
break
}
}
renderCartTable();
}
function renderCartTable() {
var html = '';
var ele = document.getElementById("demo2");
ele.innerHTML = ''; //Start by clearng your table of old elements
html += "<table id='tblCart' border='1|1'>";
html += "<tr><td>Product ID</td>";
html += "<td>Product Description</td>";
html += "<td>Quantity</td>";
html += "<td>Price</td>";
html += "<td>Total</td>";
html += "<td>Action</td></tr>";
for (var i = 0; i < cart.length; i++) {
html += "<tr>";
html += "<td>" + cart[i].product.product_id + "</td>";
html += "<td>" + cart[i].product.product_desc + "</td>";
html += "<td>" + cart[i].product_qty + "</td>";
html += "<td>" + cart[i].product.product_price + "</td>";
html += "<td>" + parseFloat(cart[i].product.product_price) * parseInt(cart[i].product_qty) + "</td>";
html += "<td><button type='submit' onClick='subtractQuantity(\"" + cart[i].product.product_id + "\", this);'/>Subtract Quantity</button></td>";
html += "</tr>";
}
html += "</table>";
ele.innerHTML = html;
}
function subtractQuantity(product_id)
{
alert("Removing 1 instance of product "+product_id);
for (var i = 0; i < cart.length; i++) {
if (cart[i].product.product_id == product_id) {
cart[i].product_qty--;//decrement by one
}
if (cart[i].product_qty == 0) {
cart.splice(i,1);//Remove from cart
}
console.log("Products " + JSON.stringify(products));
}
//Finally, re-render the cart table
renderCartTable();
}
function removeItem(product_id) {
for (var i = 0; i < products.length; i++) {
if (products[i].product_id == product_id) {
// DO NOT CHANGE THE 1 HERE
products.splice(i, 1);
}
}
}
这将从产品指定的数量开始您的购物车,然后从那里增加/减少1。