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Adding Classes

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Insecure Resource

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JavaScript

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HTML 

              
                <button type="button" class="menu" id="fix">
  <span class="menu-bar"></span>
</button>
<nav class="nav" id="nav">
  <p>メニュー</p>
</nav>

<main class="contents">

  <h1>Menu Open Scroll stop（body fixed） Vanilla JS</h1>

  <p><img src="https://picsum.photos/id/1003/500/600" alt=""></p>
  <p><img src="https://picsum.photos/id/1062/1600/500" alt=""></p>
  <p><img src="https://picsum.photos/id/275/400/500" alt=""></p>

</main>
!

CSS 

              
                @charset "UTF-8";
/* テスト用style */
html {
  min-height: 100vh;
}
body {
  margin: 0;
  padding: 100px 0;
  text-align: center;
}
h1 {
  text-align: center;
  margin-bottom: 10vh;
}
p {
  margin: 100px 0;
}
img {
  max-width: 100%;
  vertical-align: top;
}
.menu {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 100;
  height: 50px;
  width: 50px;
}
.menu-bar {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  width: 20px;
  margin: 0 auto;
  background-color: #000;
  margin-top: -1px;
}
.menu-bar:before,
.menu-bar:after {
  content: "";
  position: absolute;
  left: 0;
  height: 2px;
  width: 20px;
  background-color: #000;
  transition: transform .5s, top .5s;
}
.menu-bar:before {
  top: -7px;
}
.menu-bar:after {
  top: 7px;
}
.menu.is-active .menu-bar {
  background-color: transparent;
}
.menu.is-active .menu-bar:before {
  top: 0;
  transform: rotate(45deg);
}
.menu.is-active .menu-bar:after {
  top: 0;
  transform: rotate(-45deg);
}
.nav {
  visibility: hidden;
  opacity: 0;
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  z-index: 50;
  background-color: rgba(0,0,0,.5);
  transition: opacity .5s, visibility .5s;
  color: #fff;
  font-size: 40px;
}
.nav p {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  margin: 0;
}
.nav.is-active {
  visibility: visible;
  opacity: 1;
}
!

JS 

              
                //スクロール固定オブジェクトセット
const bodyScroll = {
	//スクロール位置保存用プロパティ
	scrollY: 0,

	//スクロール固定用ベースstyle
	styles: {
		position: 'fixed',
		left: 0,
		width: '100%',
		boxSizing: 'border-box',
	},

	//スクロール固定・解除メソッド
	fixed: function(isFixed) {
		//スクロール固定
		if(isFixed) {
			//style追加・更新
			//現在の位置を取得
			this.scrollY = window.pageYOffset || document.documentElement.scrollTop;
			//現在の位置をstyleに設定
			this.styles.top = (this.scrollY * -1) + 'px';

			//スクロールバーの幅取得・設定（ガタツキ防止）
			this.styles.paddingRight = (window.innerWidth - document.body.clientWidth) + 'px'

			//その他のstyleをセット
			Object.keys(this.styles).forEach(function(key) {
				document.body.style[key] = this.styles[key];
			}.bind(this));


		//スクロール固定解除
		} else {
			//styleリセット
			Object.keys(this.styles).forEach(function(key) {
				document.body.style[key] = '';
			});

			//スクロール位置設定
			window.scrollTo(0, this.scrollY);
		}
	}
};

//スクロール固定テストコード
const fixBtn = document.getElementById('fix');
const nav = document.getElementById('nav');
fixBtn.addEventListener('click',function() {
	if(fixBtn.classList.contains('is-active')) {

		//スクロール停止解除
		bodyScroll.fixed(false);

		//メニュー非表示
		fixBtn.classList.remove('is-active');
		nav.classList.remove('is-active');
	} else {

		//スクロール停止
		bodyScroll.fixed(true);

		//メニュー表示
		fixBtn.classList.add('is-active');
		nav.classList.add('is-active');
	}
});
!
999px

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