GreenTech/HCT/script.js

// Example product list with computer, phone, keyboard, mouse, and battery
const products = [
    { id: 1, name: "Old Computer", price: 100.00, image: "https://via.placeholder.com/200x150?text=Computer" },
    { id: 2, name: "Used Smartphone", price: 150.00, image: "https://via.placeholder.com/200x150?text=Phone" },
    { id: 3, name: "Wireless Keyboard", price: 30.00, image: "https://via.placeholder.com/200x150?text=Keyboard" },
    { id: 4, name: "Wired Mouse", price: 20.00, image: "https://via.placeholder.com/200x150?text=Mouse" },
    { id: 5, name: "Rechargeable Battery", price: 10.00, image: "https://via.placeholder.com/200x150?text=Battery" }
];

// Initialize cart (using localStorage to persist data across page reloads)
let cart = JSON.parse(localStorage.getItem('cart')) || [];

// Function to render product list
function renderProductList() {
    const productListContainer = document.getElementById('product-list');
    productListContainer.innerHTML = '';

    products.forEach(product => {
        const productCard = document.createElement('div');
        productCard.classList.add('product-card');

        productCard.innerHTML = `
            <img src="${product.image}" alt="${product.name}">
            <h3>${product.name}</h3>
            <p>Price: $${product.price.toFixed(2)}</p>
            <button onclick="addToCart(${product.id})">Add to Cart</button>
        `;
        
        productListContainer.appendChild(productCard);
    });
}

// Function to add item to cart
function addToCart(productId) {
    const product = products.find(p => p.id === productId);

    // Check if the product is already in the cart
    const cartItem = cart.find(item => item.product.id === productId);

    if (cartItem) {
        cartItem.quantity += 1;  // Increase quantity if already in cart
    } else {
        cart.push({ product, quantity: 1 });
    }

    // Save the cart in localStorage
    localStorage.setItem('cart', JSON.stringify(cart));

    renderCart();
}

// Function to render the cart
function renderCart() {
    const cartItemsContainer = document.getElementById('cart-items');
    const totalCostContainer = document.getElementById('total-cost');
    
    cartItemsContainer.innerHTML = '';
    let totalCost = 0;

    cart.forEach(item => {
        const cartItem = document.createElement('li');
        const itemTotal = item.product.price * item.quantity;
        totalCost += itemTotal;

        cartItem.innerHTML = `
            ${item.product.name} (x${item.quantity}) - $${itemTotal.toFixed(2)}
        `;
        cartItemsContainer.appendChild(cartItem);
    });

    totalCostContainer.textContent = totalCost.toFixed(2);
}

// Initialize the page
renderProductList();
renderCart();