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/*
simple shopping cart example
*/
class ShoppingCart {
constructor(cart) {
this.cartContent = cart;
this.cartContent.items = [];
const accountForm = document.getElementById('account-form');
accountForm.style.display = 'none';
const shoppingPage = document.getElementById('shopping-page');
shoppingPage.style.display = 'unset';
document.getElementById('user-name').textContent = name;
[...document.getElementsByClassName('shopping-item')]
.forEach(item => {
item.addEventListener('click', (evt) => {
evt.preventDefault();
this.addToCart(item.dataset.item);
})
});
}
addToCart(item) {
const ix = this.cartContent.items.findIndex((i) => i.name === item);
if (ix < 0)
this.cartContent.items.push({ name: item, count: 1 });
else
this.cartContent.items[ix].count += 1;
this.updateOrder();
}
deleteCartItem(item) {
const ix = this.cartContent.items.findIndex((i) => i.name === item);
if (ix < 0)
this.cartContent.items.push({ name: item, count: 1 });
else if (this.cartContent.items[ix].count == 1)
this.cartContent.items.splice(ix, 1);
else
this.cartContent.items[ix].count -= 1;
this.updateOrder();
}
updateOrder() {
fetch(`/cart/${this.cartContent.cartID}`, {
method: "PUT",
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(this.cartContent)
})
.then(r => {
if (! r.ok)
throw 'error';
const cartListContainer = document.getElementById('cart-list-container');
if (this.cartContent.items.length == 0)
cartListContainer.style.display = 'none';
else
{
cartListContainer.style.display = 'initial';
const cartList = document.getElementById('cart-list');
[...cartList.querySelectorAll('li:not(:first-child)')]
.forEach(li => li.remove());
const li = cartListContainer.querySelector('li');
this.cartContent.items.forEach(item => {
const lic = li.cloneNode(true);
lic.querySelector('span.text-placeholder').textContent = `${item.name} (${item.count})`;
const removeBtn = lic.querySelector('span.cart-item');
removeBtn.addEventListener('click', (li) => this.deleteCartItem(item.name));
cartList.append(lic);
});
}
})
.catch(err => {
console.log(err);
alert('Failed to add item to cart');
});
}
};
window.addEventListener('load', () => {
const createCartBtn = document.getElementById('create-cart-btn');
createCartBtn.addEventListener('click', (evt) => {
evt.preventDefault();
const client = document.forms['client-form']['client-name'].value;
if (client == "")
alert("Please enter a user name");
else
{
const newCart = {
client: client
};
fetch('/cart', {
method: "POST",
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify(newCart)
})
.then(r => r.json())
.then(cartID => {
newCart.cartID = cartID;
new ShoppingCart(newCart);
})
.catch(err => {
console.log(err);
alert("failed to create shopping cart");
})
}
});
});
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