37 lines
961 B
JavaScript
37 lines
961 B
JavaScript
const toc = document.getElementById("TableOfContents");
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const getId = (el) => {
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do {
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const id = el.getAttribute("id");
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if (id) {
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return id;
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}
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el = el.previousElementSibling;
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} while (el);
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};
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if (toc) {
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if (toc.children.length < 1) {
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toc.parentElement.remove();
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} else {
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const observer = new IntersectionObserver((entries) => {
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const filtered = entries.filter(
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(i) => getId(i.target) && i.intersectionRatio > 0
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);
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if (filtered.length > 0) {
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toc.querySelector(`li.active`)?.classList.remove("active");
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filtered.forEach((entry) => {
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const id = getId(entry.target);
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toc
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.querySelector(`li a[href="#${id}"]`)
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.parentElement.classList.add("active");
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});
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}
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});
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// Track all sections that have an `id` applied
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document.querySelectorAll(".copy *").forEach((section) => {
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observer.observe(section);
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});
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}
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}
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