const observer = new IntersectionObserver((entries) => {
|
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"))
|
} else {
|
tocEntryElements.forEach((tocEntryElement) => tocEntryElement.classList.remove("in-view"))
|
}
|
}
|
}
|
})
|
|
function toggleToc(this: HTMLElement) {
|
this.classList.toggle("collapsed")
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this.setAttribute(
|
"aria-expanded",
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this.getAttribute("aria-expanded") === "true" ? "false" : "true",
|
)
|
const content = this.nextElementSibling as HTMLElement | undefined
|
if (!content) return
|
content.classList.toggle("collapsed")
|
}
|
|
function setupToc() {
|
for (const toc of document.getElementsByClassName("toc")) {
|
const button = toc.querySelector(".toc-header")
|
const content = toc.querySelector(".toc-content")
|
if (!button || !content) return
|
button.addEventListener("click", toggleToc)
|
window.addCleanup(() => button.removeEventListener("click", toggleToc))
|
}
|
}
|
|
document.addEventListener("nav", () => {
|
setupToc()
|
|
// update toc entry highlighting
|
observer.disconnect()
|
const headers = document.querySelectorAll("h1[id], h2[id], h3[id], h4[id], h5[id], h6[id]")
|
headers.forEach((header) => observer.observe(header))
|
})
|
