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popover.inline.ts
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popover.inline.ts
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import { computePosition, flip, inline, shift } from "@floating-ui/dom"
import { normalizeRelativeURLs } from "../../util/path"
const p = new DOMParser()
async function mouseEnterHandler(
this: HTMLLinkElement,
{ clientX, clientY }: { clientX: number; clientY: number },
) {
const link = this
if (link.dataset.noPopover === "true") {
return
}
async function setPosition(popoverElement: HTMLElement) {
const { x, y } = await computePosition(link, popoverElement, {
middleware: [inline({ x: clientX, y: clientY }), shift(), flip()],
})
Object.assign(popoverElement.style, {
left: `${x}px`,
top: `${y}px`,
})
}
const hasAlreadyBeenFetched = () =>
[...link.children].some((child) => child.classList.contains("popover"))
// dont refetch if there's already a popover
if (hasAlreadyBeenFetched()) {
return setPosition(link.lastChild as HTMLElement)
}
const thisUrl = new URL(document.location.href)
thisUrl.hash = ""
thisUrl.search = ""
const targetUrl = new URL(link.href)
const hash = targetUrl.hash
targetUrl.hash = ""
targetUrl.search = ""
const response = await fetch(`${targetUrl}`).catch((err) => {
console.error(err)
})
// bailout if another popover exists
if (hasAlreadyBeenFetched()) {
return
}
if (!response) return
const [contentType] = response.headers.get("Content-Type")!.split(";")
const [contentTypeCategory, typeInfo] = contentType.split("/")
const popoverElement = document.createElement("div")
popoverElement.classList.add("popover")
const popoverInner = document.createElement("div")
popoverInner.classList.add("popover-inner")
popoverElement.appendChild(popoverInner)
popoverInner.dataset.contentType = contentType ?? undefined
switch (contentTypeCategory) {
case "image":
const img = document.createElement("img")
img.src = targetUrl.toString()
img.alt = targetUrl.pathname
popoverInner.appendChild(img)
break
case "application":
switch (typeInfo) {
case "pdf":
const pdf = document.createElement("iframe")
pdf.src = targetUrl.toString()
popoverInner.appendChild(pdf)
break
default:
break
}
break
default:
const contents = await response.text()
const html = p.parseFromString(contents, "text/html")
normalizeRelativeURLs(html, targetUrl)
const elts = [...html.getElementsByClassName("popover-hint")]
if (elts.length === 0) return
elts.forEach((elt) => popoverInner.appendChild(elt))
}
setPosition(popoverElement)
link.appendChild(popoverElement)
if (hash !== "") {
const heading = popoverInner.querySelector(hash) as HTMLElement | null
if (heading) {
// leave ~12px of buffer when scrolling to a heading
popoverInner.scroll({ top: heading.offsetTop - 12, behavior: "instant" })
}
}
}
document.addEventListener("nav", () => {
const links = [...document.getElementsByClassName("internal")] as HTMLLinkElement[]
for (const link of links) {
link.addEventListener("mouseenter", mouseEnterHandler)
window.addCleanup(() => link.removeEventListener("mouseenter", mouseEnterHandler))
}
})