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HTML 

              
                <h1>Simple Masonry Flexbox & Vanilla JS</h1>
<h2>※横の並び順は維持されます。</h2>
<ul class="js-masonry-list test-list">
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/103/400/300" alt="" width="400" height="300">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/1003/300/400" alt="" width="300" height="400">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/90/300/200" alt="" width="300" height="200">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/100/300/150" alt="" width="300" height="150">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/61/300/280" alt="" width="300" height="280">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/23/300/400" alt="" width="300" height="400">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/13/400/300" alt="" width="400" height="300">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/43/300/380" alt="" width="300" height="380">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/54/300/280" alt="" width="300" height="280">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/76/300/150" alt="" width="300" height="150">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/56/400/300" alt="" width="400" height="300">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/783/300/300" alt="" width="300" height="300">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/72/300/200" alt="" width="300" height="200">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/161/300/150" alt="" width="300" height="150">
  </li>
  <li class="js-masonry-elm">
    <img src="https://picsum.photos/id/829/300/280" alt="" width="300" height="280">
  </li>
</ul>

<h2>テキストリスト</h2>
<ul class="js-masonry-list test-list-text">
  <li class="js-masonry-elm">
    <h3>リスト1</h3>
    <ul class="test-list-sub">
      <li><a href="">リンク1</a></li>
      <li><a href="">リンク2</a></li>
      <li><a href="">リンク3</a></li>
    </ul>
  </li>
  <li class="js-masonry-elm">
    <h3>リスト2</h3>
    <ul class="test-list-sub">
      <li><a href="">リンク1</a></li>
      <li><a href="">リンク2</a></li>
      <li><a href="">リンク3</a></li>
      <li><a href="">リンク4</a></li>
    </ul>
  </li>
  <li class="js-masonry-elm">
    <h3>リスト3</h3>
    <ul class="test-list-sub">
      <li><a href="">リンク1</a></li>
      <li><a href="">リンク2</a></li>
      <li><a href="">リンク3</a></li>
      <li><a href="">リンク4</a></li>
    </ul>
  </li>
  <li class="js-masonry-elm">
    <h3>リスト4</h3>
    <ul class="test-list-sub">
      <li><a href="">リンク1</a></li>
      <li><a href="">リンク2</a></li>
      <li><a href="">リンク3</a></li>
      <li><a href="">リンク4</a></li>
      <li><a href="">リンク5</a></li>
      <li><a href="">リンク6</a></li>
    </ul>
  </li>
  <li class="js-masonry-elm">
    <h3>リスト5</h3>
    <ul class="test-list-sub">
      <li><a href="">リンク1</a></li>
      <li><a href="">リンク2</a></li>
      <li><a href="">リンク3</a></li>
      <li><a href="">リンク4</a></li>
    </ul>
  </li>
  <li class="js-masonry-elm">
    <h3>リスト6</h3>
    <ul class="test-list-sub">
      <li><a href="">リンク1</a></li>
      <li><a href="">リンク2</a></li>
      <li><a href="">リンク3</a></li>
      <li><a href="">リンク4</a></li>
      <li><a href="">リンク5</a></li>
      <li><a href="">リンク6</a></li>
    </ul>
  </li>
  <li class="js-masonry-elm">
    <h3>リスト7</h3>
    <ul class="test-list-sub">
      <li><a href="">リンク1</a></li>
      <li><a href="">リンク2</a></li>
    </ul>
  </li>
  <li class="js-masonry-elm">
    <h3>リスト8</h3>
    <ul class="test-list-sub">
      <li><a href="">リンク1</a></li>
      <li><a href="">リンク2</a></li>
      <li><a href="">リンク3</a></li>
      <li><a href="">リンク4</a></li>
    </ul>
  </li>
  <li class="js-masonry-elm">
    <h3>リスト9</h3>
    <ul class="test-list-sub">
      <li><a href="">リンク1</a></li>
    </ul>
  </li>
  <li class="js-masonry-elm">
    <h3>リスト10</h3>
    <ul class="test-list-sub">
      <li><a href="">リンク1</a></li>
    </ul>
  </li>
</ul>
!

CSS 

              
                /* Simple Masonry Flexbox & Vanilla JS ベース設定 */
.js-masonry-list {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
}
@media only screen and (min-width: 1025px) {
  .js-masonry-list {
    column-gap: 2.5%;
  }
  .js-masonry-elm {
    width: 18%;
    margin-bottom: 2.5%;
  }
}
@media only screen and (min-width: 601px) and (max-width: 1024px) {
  .js-masonry-list {
    column-gap: 1.25%;
  }
  .js-masonry-elm {
    width: 32.5%;
    margin-bottom: 1.25%;
  }
}
@media only screen and (min-width: 451px) and (max-width: 600px) {
  .js-masonry-list {
    column-gap: 2%;
  }
  .js-masonry-elm {
    width: 49%;
    margin-bottom: 2%;
  }
}
@media only screen and (max-width: 450px) {
  .js-masonry-elm {
    width: 100%;
    margin-bottom: 20px;
  }
}



/* テスト用設定 */
body {
  margin: 0;
  padding: 50px 0;
}
h1 {
  text-align: center;
  margin-bottom: 10vh;
}
h2 {
  margin: 0 0 40px;
  text-align: center;
}
h3 {
  margin: 0 0 10px;
  font-size: 16px;
}
.lead {
  margin: 0 0 40px;
  text-align: center;
  font-size: 18px;
}

img {
  height: auto;
  width: 100%;
  vertical-align: top;
}
.test-list,
.test-list-text {
  max-width: 1200px;
  margin: 0 auto 100px;
  padding: 0 50px;
  list-style: none;
}
.test-list-text .js-masonry-elm {
  padding: 15px;
  box-sizing: border-box;
}
.js-masonry-elm {
  background-color: #f7f7f7;
  font-size: 14px;
}
.test-list-sub {
  padding-left: 1em;
}
.test-list-sub li + li {
  margin-top: 10px;
}
@media only screen and (max-width: 600px) {
  .test-list {
    padding: 0 20px;
  }
}
!

JS 

              
                masonry({
  target: '.js-masonry-list',  //対象リスト
  column: 5,  //カラム数
  responsive: [{  //レスポンシブ設定
    breakpoint: 1024, //ブレイクポイント max-width
    column: 3
  }, {
    breakpoint: 600,
    column: 2
  }, {
    breakpoint: 450,
    column: 1
  }]
});

//Simple Masonry Flexbox & Vanilla JS
function masonry(setOptions) {
  'use strict';

	//options
	const defaultOptions = {
		target: '.js-masonry-list',  //対象リスト
		column: 1,  //カラム数
		responsive: null,
		/*
			//レスポンシブ設定
			responsive: [{
				breakpoint: 1024, //ブレイクポイント max-width
				column: 3
			}, {
				breakpoint: 500,
				column: 1
			}]
		*/
		activeClass: 'is-active',  //Masonry active class
		listClass: '.js-masonry-list',  //対象リスト class
		listElmsClass: '.js-masonry-elm',  //対象リスト内要素 class
	}
	//設定をマージ
	const options = Object.assign({}, defaultOptions, setOptions);

	//class設定
	const listClass = options.listClass;
	const listElmsClass = options.listElmsClass;

	//対象リスト取得
	const lists = Array.prototype.slice.call(document.querySelectorAll(listClass),0);
	//表示エリアが存在するかチェック
	if(lists.length === 0) {
		return false;
	}

	//masonry関数呼び出し
	masonryFunk(options);
	window.addEventListener('resize',  function() {
		masonryFunk(options);
	});

	//masonry関数
	function masonryFunk(options) {
		//カラム数チェック
		let column = options.column;
		//レスポンシブ切り替え
		const responsive = options.responsive;
		if(responsive) {
			//ウィンドウの幅取得
			const winWidth = window.innerWidth;
			//ウィンドウの幅とブレイクポイントを比較
			for (let i = 0; i < responsive.length; i++) {
				if(winWidth <= responsive[i].breakpoint) {
					column = responsive[i].column;
				}
			}
		}

		//1カラムの場合は設定をリセットし処理を終了
		if(column === 1) {
			lists.forEach(function(list){
				const listElms = Array.prototype.slice.call(list.querySelectorAll(listElmsClass),0);
				listElms.forEach(function(listElm){
					//設定リセット
					listElm.style.marginTop = '';
				});
			});
			return false;
		}

		//対象リストごとの設定
		lists.forEach(function(list){
			//対象リスト内要素取得
			const listElms = Array.prototype.slice.call(list.querySelectorAll(listElmsClass),0);
			//対象リスト内要が存在するかチェック
			if(listElms.length === 0) {
				return false;
			}
			
			//初期設定
			if(!list.classList.contains(options.activeClass)) {
				//active class設定
				list.classList.add(options.activeClass);
			}

			//要素の位置
			listElms.forEach(function(listElm,index){
				//設定リセット
				listElm.style.marginTop = '';

				//最初の行は処理しない
				if(column > index) {
					return;
				}

				//直上の要素取得
				const topListElm = listElms[index-column];
				//直上の要素の位置取得
				const topListElmPosi =  topListElm.getBoundingClientRect().top;
				//直上の要素のmargin-bottomを含む高さ取得
				const topListHeight =  getHeightAndMarginBottom(topListElm);
				//直上の要素の下端位置取得
				const topListBottomPosi = topListElmPosi + topListHeight;

				//表示エリアの位置取得
				const listElmPosi =  listElm.getBoundingClientRect().top;
				//調整位置取得
				let setPosi = listElmPosi.toFixed(0) - topListBottomPosi.toFixed(0);
				//0の場合処理しない
				if(setPosi === 0) {
					return false;
				}
				//位置をズラす
				setPosi = '-' + setPosi + 'px';
				listElm.style.marginTop = setPosi;
			});
		});
	}

	//margin-bottomを含む高さ
	function getHeightAndMarginBottom(elm) {
		//高さ取得
		const height = elm.getBoundingClientRect().height;
		//margin取得
		const styles = getComputedStyle(elm);
		const bottom = parseFloat(styles.marginBottom);
		return height + bottom;
	}

}
!
999px

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