ハンバーガーメニューその３

ハンバーガーメニュー（メニューリスト完全分離版）

ページコンテンツ

メニューリストを完全に分離したデモ


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

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" href="reset.css">
  <link rel="stylesheet" href="style.css">
  <title>ハンバーガーメニュー完全版</title>
</head>

<body>
  <header>
    <div class="hamburger-btn" id="hamburger-btn">
      <span></span>
      <span></span>
      <span></span>
    </div>
    <div class="menu-overlay" id="menu-overlay"></div>
    <nav class="menu-links" id="menu-links">
      <a href="#">ホーム</a>
      <a href="#">サービス</a>
      <a href="#">コンタクト</a>
    </nav>
  </header>

  <main>
    <section class="content">
      <h1>ページコンテンツ</h1>
      <p>メニューリスト完全分離版デモ</p>
    </section>
  </main>

  <footer></footer>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.5/gsap.min.js"></script>
  <script src="index.js"></script>
</body>

</html>


* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: sans-serif;
  overflow-x: hidden;
}

.hamburger-btn {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 35px;
  height: 30px;
  cursor: pointer;
  z-index: 1100;
}

.hamburger-btn span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: #000;
  transition: all 0.3s ease;
}

.hamburger-btn span:nth-child(1) { top: 0; }
.hamburger-btn span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.hamburger-btn span:nth-child(3) { bottom: 0; }

.hamburger-btn.open span:nth-child(1) { transform: rotate(45deg); top: 50%; }
.hamburger-btn.open span:nth-child(2) { opacity: 0; }
.hamburger-btn.open span:nth-child(3) { transform: rotate(-45deg); top: 50%; }

.menu-overlay {
  position: fixed;
  top: 100%;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #fff;
  z-index: 1000;
}

.menu-links {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1001;
  text-align: center;
  opacity: 0;
  pointer-events: none;
}

.menu-links a {
  font-size: 24px;
  margin: 15px 0;
  display: block;
  text-decoration: none;
  color: #000;
}

.content {
  height: 150vh;
  background-color: #f0f0f0;
  padding: 20px;
  text-align: center;
}


const hamburgerBtn = document.getElementById('hamburger-btn');
const menuOverlay = document.getElementById('menu-overlay');
const menuLinks = document.getElementById('menu-links');

let isMenuOpen = false;

function openMenu() {
  hamburgerBtn.classList.add('open');
  gsap.fromTo(menuOverlay,
    { top: "100%" },
    { top: "0%", duration: 0.8, ease: "power3.out" }
  );
  gsap.to(menuLinks, {
    opacity: 1,
    duration: 0.6,
    delay: 0.4,
    ease: "power2.out",
    pointerEvents: "auto"
  });
  isMenuOpen = true;
}

function closeMenu() {
  hamburgerBtn.classList.remove('open');
  gsap.fromTo(menuOverlay,
    { top: "0%" },
    {
      top: "-100%",
      duration: 0.8,
      ease: "power3.in",
      onComplete: () => {
        gsap.set(menuOverlay, { top: "100%" });
      }
    }
  );
  gsap.to(menuLinks, {
    opacity: 0,
    duration: 0.4,
    ease: "power2.in",
    pointerEvents: "none"
  });
  isMenuOpen = false;
}

hamburgerBtn.addEventListener('click', () => {
  if (!isMenuOpen) {
    openMenu();
  } else {
    closeMenu();
  }
});