回答編集履歴
1
コメントを受けて追記
test
CHANGED
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@@ -145,3 +145,183 @@
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</html>
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```
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---
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### コメントを受けて追記
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ひとまず、書いてみました。
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ご自分のコードに組み込む際に解説が必要な部分がありましたら、コメントでお知らせください。
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```html
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<!doctype html>
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<html lang="ja">
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<head>
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<meta charset="UTF-8" />
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<meta name="robots" content="noindex,nofollow" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<!-- <link rel="stylesheet" href="https://plot-hub.com/code_example/lib/css/reset.css"> -->
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<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/destyle.css@4.0.1/destyle.min.css">
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<style media="screen">
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section.toc-demo {
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margin: 0 auto;
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}
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h2 {
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font-size: 20px;
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background-color: #f3f3f3;
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border-bottom: 3px solid #333;
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padding: 5px 0 5px 10px;
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}
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p {
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padding-left: 10px;
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}
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ol {
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width: 43px;
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width: auto;
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position: fixed;
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top: 4vh;
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right: 25px;
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writing-mode: vertical-rl;
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display: flex;
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line-height: 1;
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counter-reset: index;
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}
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li {
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list-style-type: none;
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list-style-position: inside;
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/* list-style-type: symbols('①' '②' '③' '④' '⑤'); */
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text-orientation: sideways;
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counter-increment: index;
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display: flex;
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&::before {
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content: counter(index);
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text-orientation: upright;
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border: 1px solid;
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border-radius: 50%;
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}
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&.current {
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&::before {
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background-color: #000;
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color: white;
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}
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}
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}
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a {
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display: block;
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width: 100%;
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color: #fff;
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margin-bottom: 1px;
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text-decoration: none;
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padding: 3px 5px 3px 10px;
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}
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a.current {
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background-color: #dd5eb3;
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color: #000;
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writing-mode: vertical-rl;
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-webkit-writing-mode: vertical-rl;
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-moz-writing-mode: vertical-rl;
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-ms-writing-mode: tb-rl;
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-ms-writing-mode: vertical-rl;
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}
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.top {
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width: 100%;
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height: 70vh;
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background-color: #fbb03b;
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}
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.writing-mode {
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writing-mode: vertical-rl;
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-webkit-writing-mode: vertical-rl;
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-moz-writing-mode: vertical-rl;
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-ms-writing-mode: tb-rl;
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-ms-writing-mode: vertical-rl;
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}
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.content {
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width: 100%;
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height: 100vh;
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}
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.toc-demo .content:nth-child(2) {
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background: #8cc63f;
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}
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.toc-demo .content:nth-child(3) {
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background: #0092ff;
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}
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</style>
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</head>
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<body>
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<ol>
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<li></li>
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<li></li>
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<li></li>
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<li></li>
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<li></li>
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</ol>
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<section class="top">TOP</section>
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<section class="toc-demo">
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<div class="content">
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<h2 class="h2test">見出し１</h2>
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</div>
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<div class="content">
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<h2 class="h2test">見出し２</h2>
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</div>
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<div class="content">
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<h2 class="h2test">見出し３</h2>
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</div>
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<div class="content">
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<h2 class="h2test">見出し４</h2>
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</div>
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<div class="content">
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<h2 class="h2test">見出し５</h2>
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</div>
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</section>
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<script>
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document.querySelectorAll('.content').forEach(element => {
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new IntersectionObserver(
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(entries, observer) => {
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entries.forEach((entry) => {
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if (entry.isIntersecting) {
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document.querySelectorAll(`li`).forEach(x => {
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x.textContent = '';
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x.classList.remove('current')
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});
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const target = document.querySelector(`li:nth-child(${[...document.querySelectorAll('.content').values()].indexOf(entry.target) + 1})`)
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target.textContent = entry.target.querySelector('.h2test').textContent;
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target.classList.add('current')
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} else {
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}
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});
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},
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{
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root: null,
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rootMargin: "-50% 0% -50% 0%",
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threshold: (x => Array.from(Array(x + 1), (...[, i]) => i / x))(1),
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})
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.observe(element);
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})
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</script>
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</body>
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</html>
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```
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