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Multilevel dropdown menu using HTML, CSS, and JavaScript.

 Features of this Menu:

✅ Supports multiple levels of dropdowns
✅ Works on hover for desktop & click for mobile
✅ Fully responsive with a hamburger menu on small screens
✅ Smooth animations using CSS transitions

🛠️ Code Implementation:

1. HTML Structure

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Multilevel Dropdown Menu</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>

    <!-- Navigation Bar -->
    <nav class="navbar">
        <div class="logo">My Website</div>
        <button class="menu-toggle" onclick="toggleMenu()">☰</button>
        <ul class="nav-links" id="navMenu">
            <li><a href="#">Home</a></li>
            <li class="dropdown">
                <a href="#">Services ▼</a>
                <ul class="dropdown-menu">
                    <li><a href="#">Web Development</a></li>
                    <li class="dropdown">
                        <a href="#">Design ▼</a>
                        <ul class="dropdown-menu">
                            <li><a href="#">UI/UX</a></li>
                            <li><a href="#">Graphic Design</a></li>
                        </ul>
                    </li>
                    <li><a href="#">SEO</a></li>
                </ul>
            </li>
            <li class="dropdown">
                <a href="#">Products ▼</a>
                <ul class="dropdown-menu">
                    <li><a href="#">Software</a></li>
                    <li class="dropdown">
                        <a href="#">Hardware ▼</a>
                        <ul class="dropdown-menu">
                            <li><a href="#">Laptops</a></li>
                            <li><a href="#">Accessories</a></li>
                        </ul>
                    </li>
                </ul>
            </li>
            <li><a href="#">Contact</a></li>
        </ul>
    </nav>

    <script src="script.js"></script>
</body>
</html>

2. CSS Styling (styles.css)

/* General Styling */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

/* Navbar Styling */
.navbar {
    background: #333;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

/* Logo */
.logo {
    font-size: 1.5em;
    font-weight: bold;
}

/* Navigation Links */
.nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

.nav-links li {
    position: relative;
}

.nav-links a {
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    display: block;
}

.nav-links a:hover {
    background: #575757;
}

/* Dropdown Menu */
.dropdown-menu {
    display: none;
    position: absolute;
    background: #444;
    list-style: none;
    padding: 0;
    margin: 0;
    top: 100%;
    left: 0;
    min-width: 180px;
    box-shadow: 0 5px 10px rgba(0,0,0,0.2);
}

.dropdown-menu li {
    width: 100%;
}

.dropdown-menu a {
    padding: 10px;
    color: white;
}

/* Show Dropdown on Hover (for Desktop) */
.dropdown:hover > .dropdown-menu {
    display: block;
}

/* Submenu (Multilevel Dropdown) */
.dropdown-menu .dropdown {
    position: relative;
}

.dropdown-menu .dropdown-menu {
    top: 0;
    left: 100%;
}

/* Mobile Menu */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5em;
    cursor: pointer;
}

/* Responsive Styles */
@media screen and (max-width: 768px) {
    .nav-links {
        flex-direction: column;
        display: none;
        width: 100%;
        background: #333;
        position: absolute;
        top: 60px;
        left: 0;
    }

    .nav-links li {
        text-align: center;
    }

    .dropdown-menu {
        position: static;
        box-shadow: none;
    }

    .menu-toggle {
        display: block;
    }

    .show-menu {
        display: flex;
    }
}

3. JavaScript for Mobile Menu (script.js)

function toggleMenu() {
    document.getElementById("navMenu").classList.toggle("show-menu");
}

📌 How It Works?

  1. Desktop View:

    • Hover over menu items to reveal dropdowns.
    • Submenus appear on the right side.

  2. Mobile View:

    • Clicking the ☰ button toggles the navigation menu.
    • Dropdowns stay open when clicked instead of hover.

🚀 Why Use This Menu?

✅ Supports unlimited levels of dropdowns
✅ Fully responsive on all devices
✅ Easy to customize and extend
✅ Lightweight and fast performance

💡 Next Step: Integrate animations or JavaScript-based enhancements like active link highlighting for a better UX.

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