JavaScript/lesson-07/Exercise-7i.html at main · deep100x/JavaScript · GitHub

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<!-- in this lesson: -->
<!-- ------------------- -->
<!--

    Lesson 7 : Functions

    Exercise - 7i   Add-to-cart -Function return();

-->

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Add to cart</title>
    <style>
        body {
            text-align: center;
        }

        button {
            cursor: pointer;
            font-size: 20px;
            height: 40px;
            min-width: 50px;
            padding: 0 10px;
            background-color: white;
            color: black;
            border: 2px solid black;
            transition: all 0.1s linear;
            margin: 5px;
        }

        button:hover {
            background-color: black;
            color: white;
        }
    </style>
</head>

<body>

    <button onclick="
        console.log(`Cart Quantity : ${cartQuantity}`);
    ">Show Quantity</button>

    <button onclick="
        updateCartQuantity(1);
    ">Add to Cart</button>

    <button onclick="
        updateCartQuantity(2);
    ">+2</button>

    <button onclick="
        updateCartQuantity(3);
    ">+3</button>

    <button onclick="
        updateCartQuantity(-2);
    ">-2</button>

    <button onclick="
        updateCartQuantity(-3)
    ">-3</button>

    <button onclick="
          updateCartQuantity(-1);
        ">Remove from cart</button>

    <button onclick="
        cartQuantity = 0;
        console.log('Cart was reset');
        console.log(`Cart Quantity : ${cartQuantity}`);
    ">
        Reset Cart
    </button>


    <script>

        let cartQuantity = 0;

        function updateCartQuantity (change)
        {
            if (cartQuantity + change > 10) {
                alert('The cart is full');
                return;
            }

            if (cartQuantity + change < 0) {
                alert('cart is empty');
                return;
            }

            cartQuantity += change;
            console.log(`Cart quantity : ${ cartQuantity }`);
        }

    </script>
</body>

</html>