83 lines
2.4 KiB
TypeScript
83 lines
2.4 KiB
TypeScript
import { computePosition, flip, inline, shift } from "@floating-ui/dom"
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import { normalizeRelativeURLs } from "../../util/path"
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const p = new DOMParser()
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async function mouseEnterHandler(
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this: HTMLLinkElement,
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{ clientX, clientY }: { clientX: number; clientY: number },
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) {
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const link = this
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if (link.dataset.noPopover === "true") {
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return
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}
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async function setPosition(popoverElement: HTMLElement) {
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const { x, y } = await computePosition(link, popoverElement, {
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middleware: [inline({ x: clientX, y: clientY }), shift(), flip()],
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})
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Object.assign(popoverElement.style, {
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left: `${x}px`,
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top: `${y}px`,
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})
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}
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const hasAlreadyBeenFetched = () =>
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[...link.children].some((child) => child.classList.contains("popover"))
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// dont refetch if there's already a popover
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if (hasAlreadyBeenFetched()) {
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return setPosition(link.lastChild as HTMLElement)
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}
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const thisUrl = new URL(document.location.href)
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thisUrl.hash = ""
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thisUrl.search = ""
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const targetUrl = new URL(link.href)
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const hash = targetUrl.hash
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targetUrl.hash = ""
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targetUrl.search = ""
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const contents = await fetch(`${targetUrl}`)
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.then((res) => res.text())
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.catch((err) => {
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console.error(err)
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})
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// bailout if another popover exists
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if (hasAlreadyBeenFetched()) {
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return
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}
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if (!contents) return
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const html = p.parseFromString(contents, "text/html")
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normalizeRelativeURLs(html, targetUrl)
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const elts = [...html.getElementsByClassName("popover-hint")]
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if (elts.length === 0) return
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const popoverElement = document.createElement("div")
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popoverElement.classList.add("popover")
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const popoverInner = document.createElement("div")
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popoverInner.classList.add("popover-inner")
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popoverElement.appendChild(popoverInner)
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elts.forEach((elt) => popoverInner.appendChild(elt))
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setPosition(popoverElement)
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link.appendChild(popoverElement)
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if (hash !== "") {
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const heading = popoverInner.querySelector(hash) as HTMLElement | null
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if (heading) {
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// leave ~12px of buffer when scrolling to a heading
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popoverInner.scroll({ top: heading.offsetTop - 12, behavior: "instant" })
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}
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}
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}
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document.addEventListener("nav", () => {
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const links = [...document.getElementsByClassName("internal")] as HTMLLinkElement[]
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for (const link of links) {
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link.removeEventListener("mouseenter", mouseEnterHandler)
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link.addEventListener("mouseenter", mouseEnterHandler)
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}
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})
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