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HTML

              
                <h1>Intersection Observer Scroll Animation<br>【simple】</h1>

<div class="label-img-box js-anime-box">
  <div class="label js-anime-elm is-anime-scaleLeftRight is-anime-delay4"></div>
  <img src="https://picsum.photos/id/1043/1200/560" alt="" class="label-img js-anime-elm is-anime-delay8 is-anime-duration1" width="1200" height="560">
</div>

<div class="label-img-box label-img-box-right js-anime-box">
  <div class="label js-anime-elm is-anime-scaleRightLeft is-anime-delay4"></div>
  <img src="https://picsum.photos/id/369/1200/560" alt="" class="label-img js-anime-elm is-anime-delay8 is-anime-duration1" width="1200" height="560">
</div>

<ul class="list js-anime-box">
  <li class="list-elm js-anime-elm is-anime-fadeInUp is-anime-delay1"><img src="https://picsum.photos/id/292/500/400" alt="" width="500" height="400"></li>
  <li class="list-elm js-anime-elm is-anime-fadeInUp is-anime-delay3"><img src="https://picsum.photos/id/230/500/400" alt="" width="500" height="400"></li>
  <li class="list-elm js-anime-elm is-anime-fadeInUp is-anime-delay5"><img src="https://picsum.photos/id/242/500/400" alt="" width="500" height="400"></li>
</ul>

<p class="js-anime-box js-anime-elm is-anime-scaleUp"><img src="https://picsum.photos/id/1003/500/600" alt="" width="500" height="600"></p>

<p class="js-anime-box js-anime-elm is-anime-scaleDown"><img src="https://picsum.photos/id/433/700/550" alt="" width="700" height="550"></p>

<p class="js-anime-box js-anime-elm is-anime-fadeInLeft"><img src="https://picsum.photos/id/1062/1600/500" alt="" width="1600" height="500"></p>

<p class="js-anime-box js-anime-elm is-anime-fadeInRight"><img src="https://picsum.photos/id/308/1600/500" alt="" width="1600" height="500"></p>
              
            
!

CSS

              
                @charset "UTF-8";
/* アニメーション設定 */
.js-anime-elm {
	opacity: 0;
	animation-fill-mode: both;
	animation-duration: 1.2s;
	animation-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
}

.is-anime {
  animation-name: fadeIn;
	&.is-anime-fadeInUp {
		animation-name: fadeInUp;
	}
	&.is-anime-fadeInLeft {
		animation-name: fadeInLeft;
	}
	&.is-anime-fadeInRight {
		animation-name: fadeInRight;
	}
	&.is-anime-scaleLeftRight {
		animation-name: scaleLeftRight;
	}
	&.is-anime-scaleRightLeft {
		animation-name: scaleRightLeft;
	}
	&.is-anime-scaleUp {
		animation-name: scaleUp;
	}
	&.is-anime-scaleDown {
		animation-name: scaleDown;
	}
}
@keyframes fadeIn {
	0% {
		opacity: 0;
	}
	100% {
		opacity: 1;
	}
}
@keyframes fadeInUp {
	0% {
		opacity: 0;
		transform: translate3d(0,100px,0);
	}
	100% {
		opacity: 1;
		transform: translate3d(0,0,0);
	}
}
@keyframes fadeInLeft {
	0% {
		opacity: 0;
		transform: translate3d(-30%,0,0);
	}
	100% {
		opacity: 1;
		transform: translate3d(0,0,0);
	}
}
@keyframes fadeInRight {
	0% {
		opacity: 0;
		transform: translate3d(30%,0,0);
	}
	100% {
		opacity: 1;
		transform: translate3d(0,0,0);
	}
}
@keyframes scaleLeftRight {
	0% {
		opacity: 1;
    transform: scale(0,1);
    transform-origin: left top;
	}
	50% {
		opacity: 1;
    transform: scale(1,1);
    transform-origin: left top;
	}
	50.1% {
		opacity: 1;
    transform: scale(1,1);
    transform-origin: right top;
	}
	100% {
		opacity: 1;
    transform: scale(0,1);
    transform-origin: right top;
	}
}
@keyframes scaleRightLeft {
	0% {
		opacity: 1;
    transform: scale(0,1);
    transform-origin: right top;
	}
	50% {
		opacity: 1;
    transform: scale(1,1);
    transform-origin: right top;
	}
	50.1% {
		opacity: 1;
    transform: scale(1,1);
    transform-origin: left top;
	}
	100% {
		opacity: 1;
    transform: scale(0,1);
    transform-origin: left top;
	}
}
@keyframes scaleUp {
	0% {
		opacity: 0;
		transform: scale(0.5);
	}
	100% {
		opacity: 1;
		transform: scale(1);
	}
}
@keyframes scaleDown {
	0% {
		opacity: 0;
		transform: scale(1.5);
	}
	100% {
		opacity: 1;
		transform: scale(1);
	}
}
@for $i from 1 through 10 {
	.is-anime-duration#{$i} {
		animation-duration:#{$i*0.1}s;
	}
}
@for $i from 1 through 10 {
	.is-anime-delay#{$i} {
		animation-delay:#{$i*0.1}s;
	}
}



/* テスト環境style */
body {
	margin: 0;
	padding: 40vh 0;
	text-align: center;
}
h1 {
	text-align: center;
	margin-bottom: 40vh;
	font-size: 40px;
}
img {
	height: auto;
	max-width: 100%;
	vertical-align: top;
}
p {
	margin: 200px 0;
}
.label-img-box {
  position: relative;
  max-width: 900px;
	margin: 0 0 200px;
}
.label-img-box-right {
	margin-left: auto;
}
.label {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  background: #000;
}
.list {
	display: flex;
	justify-content: space-between;
	list-style: none;
	padding: 0 40px;
	margin: 0 0 200px;
}
.list-elm {
	width: 30%;
}
              
            
!

JS

              
                //【シンプル版】Intersection Observerスクロールアニメーション
observerAnime();
function observerAnime() {
	//options
	const options = {
		root: null,  //IntersectionObserverのroot
		rootMargin: '-50%',  //IntersectionObserverのrootMargin
		threshold: 0,  //IntersectionObserverのthreshold
		loop: false,  //アニメーション繰り返し設定
		targetAreaClass : '.js-anime-box', //ターゲットを内包するエリアclass
		targetClass: '.js-anime-elm', //ターゲットclass
		animeSetClass: 'is-anime',  //アニメーション実行時に追加するclass
	}

	//ターゲット要素取得
	let targets = document.querySelectorAll(options.targetAreaClass);
	//要素が存在するかチェック
	if(targets.length === 0) {
		return false;
	}

	//各設定を取得
	const targetClass = options.targetClass;
	const animeSetClass = options.animeSetClass;
	options.loopFlg = options.loop;

	//observer初期設定
	let observer;
	setObserver(options);

	//observer定義関数
	function setObserver(options) {
		//オプションを取得
		options.loopFlg = options.loop;
		//observer設定
		observer = new IntersectionObserver(setAnimeClass, {
			root: options.root,
			rootMargin: options.rootMargin,
			threshold: options.threshold
		});
		targets.forEach(function(target){
			observer.observe(target);
		});
	}

	//アニメーション処理
	function setAnimeClass(entries, observer) {
		//ループフラグ取得
		const loopFlg = options.loopFlg;
		entries.forEach(entry => {
			//ターゲット要素取得
			const target = entry.target;
			//ターゲット要素の子要素取得
			const children = target.querySelectorAll(targetClass);

			//要素が画面に入ると処理
			if(entry.isIntersecting) {
				//子要素がある場合は子要素にclassを追加
				if(children.length !== 0) {
					children.forEach(function(child){
						child.classList.add(animeSetClass);
					});

				//子要素がない場合はターゲット自身にclassを追加
				} else {
					target.classList.add(animeSetClass);
				}

				//ループなしの場合
				if(!loopFlg) {
					//要素の監視を解除
					observer.unobserve(target);
				}

			//ループありの場合
			} else if(loopFlg) {
				//子要素がある場合は子要素に設定されたclassを削除
				if(children.length !== 0) {
					children.forEach(function(child){
						child.classList.remove(animeSetClass);
					});

				//子要素がない場合はターゲット自身のclassを削除
				} else {
					target.classList.remove(animeSetClass);
				}
			}
		});
	}
}
              
            
!
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