我已将PayPal智能按钮集成到我的JavaScript购物车中。我有以下代码:
<script>
paypal.Buttons({
createOrder: function(data, actions) {
// This function sets up the details of the transaction, including the amount and line item details.
return actions.order.create({
"purchase_units": [{
"amount": {
"value": countCartTotal(),
"currency_code": "USD",
"breakdown": {
"item_total": {
"currency_code": "USD",
"value": countCartTotal()
},
},
},
"items": arrayOfItems()
}
]
});
},
onApprove: function(data, actions) {
// This function captures the funds from the transaction.
return actions.order.capture().then(function(details) {
// This function shows a transaction success message to your buyer.
window.location.href = "orderConfirmed.php"
clearCart()
});
}
}).render('#paypal-button-container');
//This function displays Smart Payment Buttons on your web page.
</script>
此脚本使用:countCartTotal(),以便PayPal向用户收取正确的金额,并且可以正常工作,但我想向用户展示他们通过PayPal购买的商品。因此,在项目部分中,我尝试创建一个循环购物车中每个项目的数组。这是以下行:
"items": arrayOfItems()
'arrayOfItems()'类如下:
function arrayOfItems() {
cart.forEach((cartItem, index) => {
let currency = cartItem.price;
let quantity = cartItem.quantity;
let itemName = cartItem.name;
let items = [{"unit_amount": {"currency_code": "USD","value": currency},"quantity": quantity,"name": itemName,}];
return items;
});
}
当我在本地主机上运行代码时,JavaScript控制台会显示错误日志:
它告诉我'错误:未定义不是对象(正在评估'cartItem.name')'
我的arrayOfItems()如下:
function arrayOfItems() {
cart.forEach((cartItem, index) => {
let currency = cartItem.price;
let quantity = cartItem.quantity;
let itemName = cartItem.name;
let items = [{"unit_amount": {"currency_code": "USD","value": currency},"quantity": quantity,"name": itemName,}];
return items;
});
}
我认为错误行是:
let itemName = cartItem.name;
我的整个js文件是:
'use strict';
let cart = (JSON.parse(localStorage.getItem('cart')) || []);
const cartDOM = document.querySelector('.cart');
const addToCartButtonsDOM = document.querySelectorAll('[data-action="ADD_TO_CART"]');
if (cart.length > 0) {
cart.forEach(cartItem => {
const product = cartItem;
insertItemToDOM(product);
countCartTotal();
addToCartButtonsDOM.forEach(addToCartButtonDOM => {
const productDOM = addToCartButtonDOM.parentNode;
if (productDOM.querySelector('.product__name').innerText === product.name) {
handleActionButtons(addToCartButtonDOM, product);
}
});
});
}
addToCartButtonsDOM.forEach(addToCartButtonDOM => {
addToCartButtonDOM.addEventListener('click', () => {
const productDOM = addToCartButtonDOM.parentNode;
const product = {
image: productDOM.querySelector('.product__image').getAttribute('src'),
name: productDOM.querySelector('.product__name').innerText,
price: productDOM.querySelector('.product__price').innerText,
quantity: 1,
};
const isInCart = (cart.filter(cartItem => (cartItem.name === product.name)).length > 0);
if (!isInCart) {
insertItemToDOM(product);
cart.push(product);
saveCart();
handleActionButtons(addToCartButtonDOM, product);
}
});
});
function insertItemToDOM(product) {
cartDOM.insertAdjacentHTML('beforeend', `
<div class="cart__item">
<img class="cart__item__image" src="${product.image}" alt="${product.name}">
<h3 class="cart__item__name">${product.name}</h3>
<h3 class="cart__item__price">${product.price}</h3>
<button class="btn btn--primary btn--small${(product.quantity === 1 ? ' btn--danger' : '')}" data-action="DECREASE_ITEM">−</button>
<h3 class="cart__item__quantity">${product.quantity}</h3>
<button class="btn btn--primary btn--small" data-action="INCREASE_ITEM">+</button>
<button class="btn btn--danger btn--small" data-action="REMOVE_ITEM">×</button>
</div>
`);
addCartFooter();
}
function handleActionButtons(addToCartButtonDOM, product) {
addToCartButtonDOM.innerText = 'In Cart';
addToCartButtonDOM.disabled = true;
const cartItemsDOM = cartDOM.querySelectorAll('.cart__item');
cartItemsDOM.forEach(cartItemDOM => {
if (cartItemDOM.querySelector('.cart__item__name').innerText === product.name) {
cartItemDOM.querySelector('[data-action="INCREASE_ITEM"]').addEventListener('click', () => increaseItem(product, cartItemDOM));
cartItemDOM.querySelector('[data-action="DECREASE_ITEM"]').addEventListener('click', () => decreaseItem(product, cartItemDOM, addToCartButtonDOM));
cartItemDOM.querySelector('[data-action="REMOVE_ITEM"]').addEventListener('click', () => removeItem(product, cartItemDOM, addToCartButtonDOM));
}
});
}
function increaseItem(product, cartItemDOM) {
cart.forEach(cartItem => {
if (cartItem.name === product.name) {
cartItemDOM.querySelector('.cart__item__quantity').innerText = ++cartItem.quantity;
cartItemDOM.querySelector('[data-action="DECREASE_ITEM"]').classList.remove('btn--danger');
saveCart();
}
});
}
function decreaseItem(product, cartItemDOM, addToCartButtonDOM) {
cart.forEach(cartItem => {
if (cartItem.name === product.name) {
if (cartItem.quantity > 1) {
cartItemDOM.querySelector('.cart__item__quantity').innerText = --cartItem.quantity;
saveCart();
} else {
removeItem(product, cartItemDOM, addToCartButtonDOM);
}
if (cartItem.quantity === 1) {
cartItemDOM.querySelector('[data-action="DECREASE_ITEM"]').classList.add('btn--danger');
}
}
});
}
function removeItem(product, cartItemDOM, addToCartButtonDOM) {
cartItemDOM.classList.add('cart__item--removed');
setTimeout(() => cartItemDOM.remove(), 250);
cart = cart.filter(cartItem => cartItem.name !== product.name);
saveCart();
addToCartButtonDOM.innerText = 'Add To Cart';
addToCartButtonDOM.disabled = false;
if (cart.length < 1) {
document.querySelector('.cart-footer').remove();
}
}
function addCartFooter() {
if (document.querySelector('.cart-footer') === null) {
cartDOM.insertAdjacentHTML('afterend', `
<div class="cart-footer">
<button data-action="CLEAR_CART">Clear Cart</button>
<p data-action="CHECKOUT">Total:</p>
</div>
`);
document.querySelector('[data-action="CLEAR_CART"]').addEventListener('click', () => clearCart());
}
}
function clearCart() {
cartDOM.querySelectorAll('.cart__item').forEach(cartItemDOM => {
cartItemDOM.classList.add('cart__item--removed');
setTimeout(() => cartItemDOM.remove(), 250);
});
cart = [];
localStorage.removeItem('cart');
document.querySelector('.cart-footer').remove();
addToCartButtonsDOM.forEach(addToCartButtonDOM => {
addToCartButtonDOM.innerText = 'Add To Cart';
addToCartButtonDOM.disabled = false;
});
}
function countCartTotal() {
let cartTotal = 0;
cart.forEach(cartItem => cartTotal += cartItem.quantity * cartItem.price);
document.querySelector('[data-action="CHECKOUT"]').innerText = `Pay $${cartTotal}`;
return cartTotal;
}
function saveCart() {
localStorage.setItem('cart', JSON.stringify(cart));
countCartTotal();
}
function arrayOfItems (cartItem, product) {
let cartItemName = cartItem.name;
'use strict';
let cart = (JSON.parse(localStorage.getItem('cart')) || []);
const cartDOM = document.querySelector('.cart');
const addToCartButtonsDOM = document.querySelectorAll('[data-action="ADD_TO_CART"]');
if (cart.length > 0) {
cart.forEach(cartItem => {
const product = cartItem;
insertItemToDOM(product);
countCartTotal();
addToCartButtonsDOM.forEach(addToCartButtonDOM => {
const productDOM = addToCartButtonDOM.parentNode;
if (productDOM.querySelector('.product__name').innerText === product.name) {
handleActionButtons(addToCartButtonDOM, product);
}
});
});
}
addToCartButtonsDOM.forEach(addToCartButtonDOM => {
addToCartButtonDOM.addEventListener('click', () => {
const productDOM = addToCartButtonDOM.parentNode;
const product = {
image: productDOM.querySelector('.product__image').getAttribute('src'),
name: productDOM.querySelector('.product__name').innerText,
price: productDOM.querySelector('.product__price').innerText,
quantity: 1,
};
const isInCart = (cart.filter(cartItem => (cartItem.name === product.name)).length > 0);
if (!isInCart) {
insertItemToDOM(product);
cart.push(product);
saveCart();
handleActionButtons(addToCartButtonDOM, product);
}
});
});
function insertItemToDOM(product) {
cartDOM.insertAdjacentHTML('beforeend', `
<div class="cart__item">
<img class="cart__item__image" src="${product.image}" alt="${product.name}">
<h3 class="cart__item__name">${product.name}</h3>
<h3 class="cart__item__price">${product.price}</h3>
<button class="btn btn--primary btn--small${(product.quantity === 1 ? ' btn--danger' : '')}" data-action="DECREASE_ITEM">−</button>
<h3 class="cart__item__quantity">${product.quantity}</h3>
<button class="btn btn--primary btn--small" data-action="INCREASE_ITEM">+</button>
<button class="btn btn--danger btn--small" data-action="REMOVE_ITEM">×</button>
</div>
`);
addCartFooter();
}
function handleActionButtons(addToCartButtonDOM, product) {
addToCartButtonDOM.innerText = 'In Cart';
addToCartButtonDOM.disabled = true;
const cartItemsDOM = cartDOM.querySelectorAll('.cart__item');
cartItemsDOM.forEach(cartItemDOM => {
if (cartItemDOM.querySelector('.cart__item__name').innerText === product.name) {
cartItemDOM.querySelector('[data-action="INCREASE_ITEM"]').addEventListener('click', () => increaseItem(product, cartItemDOM));
cartItemDOM.querySelector('[data-action="DECREASE_ITEM"]').addEventListener('click', () => decreaseItem(product, cartItemDOM, addToCartButtonDOM));
cartItemDOM.querySelector('[data-action="REMOVE_ITEM"]').addEventListener('click', () => removeItem(product, cartItemDOM, addToCartButtonDOM));
}
});
}
function increaseItem(product, cartItemDOM) {
cart.forEach(cartItem => {
if (cartItem.name === product.name) {
cartItemDOM.querySelector('.cart__item__quantity').innerText = ++cartItem.quantity;
cartItemDOM.querySelector('[data-action="DECREASE_ITEM"]').classList.remove('btn--danger');
saveCart();
}
});
}
function decreaseItem(product, cartItemDOM, addToCartButtonDOM) {
cart.forEach(cartItem => {
if (cartItem.name === product.name) {
if (cartItem.quantity > 1) {
cartItemDOM.querySelector('.cart__item__quantity').innerText = --cartItem.quantity;
saveCart();
} else {
removeItem(product, cartItemDOM, addToCartButtonDOM);
}
if (cartItem.quantity === 1) {
cartItemDOM.querySelector('[data-action="DECREASE_ITEM"]').classList.add('btn--danger');
}
}
});
}
function removeItem(product, cartItemDOM, addToCartButtonDOM) {
cartItemDOM.classList.add('cart__item--removed');
setTimeout(() => cartItemDOM.remove(), 250);
cart = cart.filter(cartItem => cartItem.name !== product.name);
saveCart();
addToCartButtonDOM.innerText = 'Add To Cart';
addToCartButtonDOM.disabled = false;
if (cart.length < 1) {
document.querySelector('.cart-footer').remove();
}
}
function addCartFooter() {
if (document.querySelector('.cart-footer') === null) {
cartDOM.insertAdjacentHTML('afterend', `
<div class="cart-footer">
<button data-action="CLEAR_CART">Clear Cart</button>
<p data-action="CHECKOUT">Total:</p>
</div>
`);
document.querySelector('[data-action="CLEAR_CART"]').addEventListener('click', () => clearCart());
}
}
function clearCart() {
cartDOM.querySelectorAll('.cart__item').forEach(cartItemDOM => {
cartItemDOM.classList.add('cart__item--removed');
setTimeout(() => cartItemDOM.remove(), 250);
});
cart = [];
localStorage.removeItem('cart');
document.querySelector('.cart-footer').remove();
addToCartButtonsDOM.forEach(addToCartButtonDOM => {
addToCartButtonDOM.innerText = 'Add To Cart';
addToCartButtonDOM.disabled = false;
});
}
function countCartTotal() {
let cartTotal = 0;
cart.forEach(cartItem => cartTotal += cartItem.quantity * cartItem.price);
document.querySelector('[data-action="CHECKOUT"]').innerText = `Pay $${cartTotal}`;
return cartTotal;
}
function saveCart() {
localStorage.setItem('cart', JSON.stringify(cart));
countCartTotal();
}
function arrayOfItems() {
cart.forEach((cartItem, index) => {
let currency = cartItem.price;
let quantity = cartItem.quantity;
let itemName = cartItem.name;
let items = [{"unit_amount": {"currency_code": "USD","value": currency},"quantity": quantity,"name": itemName,}];
return items;
});
}
}
我已经使用了这段代码的较早部分,试图为此找到解决方案,并且我使用了“ .name;”。它已经奏效了。