-2
我需要在我的問題的幫助。這只是一個簡單的問題，但我無法得到它。您只需計算表格下方購物車的總計。你只需要使用JavaScript，不允許使用jquery。希望你們能回答這個簡單的問題。多謝你們。總計購物車只使用Javascript
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>  <button type='submit' onClick='addQuantity(\"" + cart[i].product.product_id + "\", this);'/>Add Quantity</button></td>";
html += "</tr>";
var GrandTotal = parseFloat(cart[i].product.product_price) * parseInt(cart[i].product_qty);
document.getElementById('demo3').innerHTML = GrandTotal;
}
html += "</table>";
ele.innerHTML = html;
}
function subtractQuantity(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 addQuantity(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
}
}
//Finally, re-render the cart table
renderCartTable();
}<!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>
<p id="demo3"></p>
</body>
</html>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>  <button type='submit' onClick='addQuantity(\"" + cart[i].product.product_id + "\", this);'/>Add Quantity</button></td>";
html += "</tr>";
var GrandTotal = parseFloat(cart[i].product.product_price) * parseInt(cart[i].product_qty);
document.getElementById('demo3').innerHTML = GrandTotal;
}
html += "</table>";
ele.innerHTML = html;
}
function subtractQuantity(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 addQuantity(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
}
}
//Finally, re-render the cart table
renderCartTable();
}<!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>
<p id="demo3"></p>
</body>
</html>
我添加按鈕你。你能再次檢查嗎？ –
我自己做到了。無論如何，非常感謝Tien – charles