如何修复此html和javascript上的order total错误？_Javascript_Html

如何修复此html和javascript上的order total错误？

javascript html

如何修复此html和javascript上的order total错误？,javascript,html,Javascript,Html,我正在尝试修复将一个项目添加到购物车时的错误，该项目的订单总额显示为“£NaN”（如下图所示），并且不会随着每个项目的添加而改变。我查看了代码，但没有看到任何不合适或不应该出现的内容，因此我不知道是什么导致了问题任何建议都会令人惊讶 if（document.readyState==“加载”）{ document.addEventListener（'DOMContentLoaded'，ready） }否则{ 就绪（） } 函数就绪（）{ var removeCartItemButtons=d

我正在尝试修复将一个项目添加到购物车时的错误，该项目的订单总额显示为“£NaN”（如下图所示），并且不会随着每个项目的添加而改变。我查看了代码，但没有看到任何不合适或不应该出现的内容，因此我不知道是什么导致了问题

任何建议都会令人惊讶

if（document.readyState==“加载”）{
document.addEventListener（'DOMContentLoaded'，ready）
}否则{
就绪（）
}
函数就绪（）{
var removeCartItemButtons=document.getElementsByClassName（'btn-danger'））
对于（var i=0；i如果（isNaN（input.value）| | input.value尝试此操作。您没有放置图像标记。但在javascript中您尝试调用
<!DOCTYPE html>
<html lang="en">
<head>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
</head>
<body>

<header class="main-header">
    <nav class="main-nav nav">
    </nav>
</header>
<section class="container content-section">
    <h2 class="section-header">MUSIC</h2>
    <div class="shop-items">
        <div class="shop-item">
            <span class="shop-item-title">Album 1</span>&nbsp;
            <span class="shop-item-price">£12.99</span>
            <img class="shop-item-image" src="">image tag
            <button class="btn btn-primary shop-item-button" type="button">ADD TO CART</button>
        </div>
    </div>
    <div class="shop-item">
        <span class="shop-item-title">Album 2</span>&nbsp;
        <div class="shop-item-details">
            <span class="shop-item-price">£14.99</span>
            <img class="shop-item-image" src="">image tag
            <button class="btn btn-primary shop-item-button" type="button">ADD TO CART</button>
        </div>
    </div>
    <div class="shop-item">
        <span class="shop-item-title">Album 3</span>&nbsp;
        <span class="shop-item-price">£9.99</span>
        <img class="shop-item-image" src="">image tag
        <button class="btn btn-primary shop-item-button" type="button">ADD TO CART</button>
    </div>
    <div class="shop-item">
        <span class="shop-item-title">Album 4</span>&nbsp;
        <span class="shop-item-price">£19.99</span>
        <img class="shop-item-image" src="">image tag
        <button class="btn btn-primary shop-item-button" type="button">ADD TO CART</button>
    </div>
</section>
<section class="container content-section">
    <h2 class="section-header">MERCH</h2>
    <div class="shop-items">
        <div class="shop-item">
            <span class="shop-item-title">T-Shirt</span>&nbsp;
            <span class="shop-item-price">£19.99</span>
            <img class="shop-item-image" src="">image tag
            <button class="btn btn-primary shop-item-button" type="button">ADD TO CART</button>
        </div>
    </div>
    <div class="shop-item">
        <span class="shop-item-title">Coffee Cup</span>&nbsp;
        <div class="shop-item-details">
            <span class="shop-item-price">£6.99</span>
            <img class="shop-item-image" src="">image tag
            <button class="btn btn-primary shop-item-button" type="button">ADD TO CART</button>
        </div>
    </div>
</section>
<section class="container content-section">
    <h2 class="section-header">CART</h2>
    <div class="cart-row">
        <span class="cart-item cart-header cart-column">ITEM</span>
        <span class="cart-price cart-header cart-column">PRICE</span>
        <span class="cart-quantity cart-header cart-column">QUANTITY</span>
    </div>
    <div class="cart-items">
    </div>
    <div class="cart-total">
        <strong class="cart-total-title">Total</strong>
        <span class="cart-total-price">£0</span>
    </div>
    <button class="btn btn-primary btn-purchase" type="button">PURCHASE</button>
</section>
<footer class="main-footer">
    <div class="container main-footer-container">
        <ul class="nav footer-nav">
            <li>
                <a href="https://www.youtube.com" target="_blank">
                    &nbsp;</a></li>
            <li>
                <a href="https://www.spotify.com" target="_blank">
                    &nbsp;</a></li>
            <li>
                <a href="https://www.facebook.com" target="_blank">
                    &nbsp;</a></li>
        </ul>
    </div>
</footer>
<script>
if (document.readyState == 'loading') {
    document.addEventListener('DOMContentLoaded', ready)
} else {
    ready()
}

function ready() {
    var removeCartItemButtons = document.getElementsByClassName('btn-danger')
    for (var i = 0; i < removeCartItemButtons.length; i++) {
        var button = removeCartItemButtons[i]
        button.addEventListener('click', removeCartItem)
    }

    var quantityInputs = document.getElementsByClassName('cart-quantity-input')
    for (var i = 0; i < quantityInputs.length; i++) {
        var input = quantityInputs[i]
        input.addEventListener('change', quantityChanged)
    }

    var addToCartButtons = document.getElementsByClassName('shop-item-button')
    for (var i = 0; i < addToCartButtons.length; i++) {
        var button = addToCartButtons[i]
        button.addEventListener('click', addToCartClicked)
    }

    document.getElementsByClassName('btn-purchase')[0].addEventListener('click', purchaseClicked)
}

function purchaseClicked() {
    alert('Thank you for your purchase')
    var cartItems = document.getElementsByClassName('cart-items')[0]
    while (cartItems.hasChildNodes()) {
        cartItems.removeChild(cartItems.firstChild)
    }
    updateCartTotal()
}

function removeCartItem(event) {
    var buttonClicked = event.target
    buttonClicked.parentElement.parentElement.remove()
    updateCartTotal()
}

function quantityChanged(event) {
    var input = event.target
    if (isNaN(input.value) || input.value <= 0) {
        input.value = 1
    }
    updateCartTotal()
}

function addToCartClicked(event) {
    var button = event.target
    var shopItem = button.parentElement.parentElement
    var title = shopItem.getElementsByClassName('shop-item-title')[0].innerText
    var price = shopItem.getElementsByClassName('shop-item-price')[0].innerText
    var imageSrc = shopItem.getElementsByClassName('shop-item-image')[0].src
    addItemToCart(title, price, imageSrc)
    updateCartTotal()
}

function addItemToCart(title, price, imageSrc) {
    var cartRow = document.createElement('div')
    cartRow.classList.add('cart-row')
    var cartItems = document.getElementsByClassName('cart-items')[0]
    var cartItemNames = cartItems.getElementsByClassName('cart-item-title')
    for (var i = 0; i < cartItemNames.length; i++) {
        if (cartItemNames[i].innerText == title) {
            alert('This item is already added to the cart')
            return
        }
    }
    var cartRowContents = `
        <div class="cart-item cart-column">
            <img class="cart-item-image" src="${imageSrc}" width="100" height="100">
            <span class="cart-item-title">${title}</span>
        </div>
        <span class="cart-price cart-column">${price}</span>
        <div class="cart-quantity cart-column">
            <input class="cart-quantity-input" type="number" value="1">
            <button class="btn btn-danger" type="button">REMOVE</button>
        </div>`
    cartRow.innerHTML = cartRowContents
    cartItems.append(cartRow)
    cartRow.getElementsByClassName('btn-danger')[0].addEventListener('click', removeCartItem)
    cartRow.getElementsByClassName('cart-quantity-input')[0].addEventListener('change', quantityChanged)
}

function updateCartTotal() {
    var cartItemContainer = document.getElementsByClassName('cart-items')[0]
    var cartRows = cartItemContainer.getElementsByClassName('cart-row')
    var total = 0
    for (var i = 0; i < cartRows.length; i++) {
        var cartRow = cartRows[i]
        var priceElement = cartRow.getElementsByClassName('cart-price')[0]
        var quantityElement = cartRow.getElementsByClassName('cart-quantity-input')[0]
        var price = parseFloat(priceElement.innerText.replace('£', ''))
        var quantity = quantityElement.value
        total = total + (price * quantity)
    }
    total = Math.round(total * 100) / 100
    document.getElementsByClassName('cart-total-price')[0].innerText = '£' + total
}

</script>
</body>
</html>




音乐
专辑1
£12.99
图像标签
添加到购物车
专辑2
£14.99
图像标签
添加到购物车
专辑3
£9.99
图像标签
添加到购物车
专辑4
£19.99
图像标签
添加到购物车
货物
T恤
£19.99
图像标签
添加到购物车
咖啡杯
£6.99
图像标签
添加到购物车
运货马车
项目
价格
量
总计
£0
购买








如果（document.readyState=='loading'）{
document.addEventListener（'DOMContentLoaded'，ready）
}否则{
就绪（）
}
函数就绪（）{
var removeCartItemButtons=document.getElementsByClassName（'btn-danger'））
对于（var i=0；i
我评论了imageSrc，并添加了遗漏的标签
但我不想要图像。那么我如何从javascript中删除它？你不是说它试图从javascript中调用图像标记吗？我仍然需要删除它吗？是的，因为如果你没有该标记，它将在控制台中出错。你能编辑你的答案并添加正确的javascript代码吗？你的意思是说代码你想让我更新之前发布了什么？是的，我删除了它：