roadmap/quartz/components/scripts/popover.inline.ts

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import { computePosition, flip, inline, shift } from "@floating-ui/dom"
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// from micromorph/src/utils.ts
// https://github.com/natemoo-re/micromorph/blob/main/src/utils.ts#L5
export function normalizeRelativeURLs(
el: Element | Document,
base: string | URL
) {
const update = (el: Element, attr: string, base: string | URL) => {
el.setAttribute(attr, new URL(el.getAttribute(attr)!, base).pathname)
}
el.querySelectorAll('[href^="./"], [href^="../"]').forEach((item) =>
update(item, 'href', base)
)
el.querySelectorAll('[src^="./"], [src^="../"]').forEach((item) =>
update(item, 'src', base)
)
}
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document.addEventListener("nav", () => {
const links = [...document.getElementsByClassName("internal")] as HTMLLinkElement[]
const p = new DOMParser()
for (const link of links) {
link.addEventListener("mouseenter", async ({ clientX, clientY }) => {
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async function setPosition(popoverElement: HTMLElement) {
const { x, y } = await computePosition(link, popoverElement, {
middleware: [
inline({ x: clientX, y: clientY }),
shift(),
flip()
]
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})
Object.assign(popoverElement.style, {
left: `${x}px`,
top: `${y}px`,
})
}
if (link.dataset.fetchedPopover === "true") {
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 = ""
// prevent hover of the same page
if (thisUrl.toString() === targetUrl.toString()) return
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const contents = await fetch(`${targetUrl}`)
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.then((res) => res.text())
.catch((err) => {
console.error(err)
})
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if (!contents) return
const html = p.parseFromString(contents, "text/html")
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normalizeRelativeURLs(html, targetUrl)
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const elts = [...html.getElementsByClassName("popover-hint")]
if (elts.length === 0) return
const popoverElement = document.createElement("div")
popoverElement.classList.add("popover")
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const popoverInner = document.createElement("div")
popoverInner.classList.add("popover-inner")
popoverElement.appendChild(popoverInner)
elts.forEach(elt => popoverInner.appendChild(elt))
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setPosition(popoverElement)
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link.appendChild(popoverElement)
link.dataset.fetchedPopover = "true"
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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' })
}
}
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})
}
})