45 lines
1.5 KiB
TypeScript
45 lines
1.5 KiB
TypeScript
const observer = new IntersectionObserver((entries) => {
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for (const entry of entries) {
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const slug = entry.target.id
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const tocEntryElements = document.querySelectorAll(`a[data-for="${slug}"]`)
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const windowHeight = entry.rootBounds?.height
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if (windowHeight && tocEntryElements.length > 0) {
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if (entry.boundingClientRect.y < windowHeight) {
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tocEntryElements.forEach((tocEntryElement) => tocEntryElement.classList.add("in-view"))
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} else {
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tocEntryElements.forEach((tocEntryElement) => tocEntryElement.classList.remove("in-view"))
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}
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}
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}
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})
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function toggleToc(this: HTMLElement) {
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this.classList.toggle("collapsed")
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this.setAttribute(
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"aria-expanded",
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this.getAttribute("aria-expanded") === "true" ? "false" : "true",
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)
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const content = this.nextElementSibling as HTMLElement | undefined
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if (!content) return
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content.classList.toggle("collapsed")
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}
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function setupToc() {
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for (const toc of document.getElementsByClassName("toc")) {
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const button = toc.querySelector(".toc-header")
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const content = toc.querySelector(".toc-content")
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if (!button || !content) return
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button.addEventListener("click", toggleToc)
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window.addCleanup(() => button.removeEventListener("click", toggleToc))
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}
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}
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document.addEventListener("nav", () => {
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setupToc()
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// update toc entry highlighting
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observer.disconnect()
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const headers = document.querySelectorAll("h1[id], h2[id], h3[id], h4[id], h5[id], h6[id]")
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headers.forEach((header) => observer.observe(header))
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})
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