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

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import micromorph from "micromorph"
import { FullSlug, RelativeURL, getFullSlug } from "../../util/path"
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// adapted from `micromorph`
// https://github.com/natemoo-re/micromorph
const NODE_TYPE_ELEMENT = 1
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let announcer = document.createElement("route-announcer")
const isElement = (target: EventTarget | null): target is Element =>
(target as Node)?.nodeType === NODE_TYPE_ELEMENT
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const isLocalUrl = (href: string) => {
try {
const url = new URL(href)
if (window.location.origin === url.origin) {
return true
}
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} catch (e) {}
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return false
}
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const getOpts = ({ target }: Event): { url: URL; scroll?: boolean } | undefined => {
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if (!isElement(target)) return
const a = target.closest("a")
if (!a) return
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if ("routerIgnore" in a.dataset) return
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const { href } = a
if (!isLocalUrl(href)) return
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return { url: new URL(href), scroll: "routerNoscroll" in a.dataset ? false : undefined }
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}
function notifyNav(url: FullSlug) {
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const event: CustomEventMap["nav"] = new CustomEvent("nav", { detail: { url } })
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document.dispatchEvent(event)
}
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let p: DOMParser
async function navigate(url: URL, isBack: boolean = false) {
p = p || new DOMParser()
const contents = await fetch(`${url}`)
.then((res) => res.text())
.catch(() => {
window.location.assign(url)
})
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if (!contents) return
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const html = p.parseFromString(contents, "text/html")
let title = html.querySelector("title")?.textContent
if (title) {
document.title = title
} else {
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const h1 = document.querySelector("h1")
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title = h1?.innerText ?? h1?.textContent ?? url.pathname
}
if (announcer.textContent !== title) {
announcer.textContent = title
}
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announcer.dataset.persist = ""
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html.body.appendChild(announcer)
// morph body
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micromorph(document.body, html.body)
// scroll into place and add history
if (!isBack) {
if (url.hash) {
const el = document.getElementById(decodeURIComponent(url.hash.substring(1)))
el?.scrollIntoView()
} else {
window.scrollTo({ top: 0 })
}
}
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// now, patch head
const elementsToRemove = document.head.querySelectorAll(":not([spa-preserve])")
elementsToRemove.forEach((el) => el.remove())
const elementsToAdd = html.head.querySelectorAll(":not([spa-preserve])")
elementsToAdd.forEach((el) => document.head.appendChild(el))
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// delay setting the url until now
// at this point everything is loaded so changing the url should resolve to the correct addresses
if (!isBack) {
history.pushState({}, "", url)
}
notifyNav(getFullSlug(window))
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delete announcer.dataset.persist
}
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window.spaNavigate = navigate
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function createRouter() {
if (typeof window !== "undefined") {
window.addEventListener("click", async (event) => {
const { url } = getOpts(event) ?? {}
if (!url) return
event.preventDefault()
try {
navigate(url, false)
} catch (e) {
window.location.assign(url)
}
})
window.addEventListener("popstate", (event) => {
const { url } = getOpts(event) ?? {}
if (window.location.hash && window.location.pathname === url?.pathname) return
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try {
navigate(new URL(window.location.toString()), true)
} catch (e) {
window.location.reload()
}
return
})
}
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return new (class Router {
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go(pathname: RelativeURL) {
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const url = new URL(pathname, window.location.toString())
return navigate(url, false)
}
back() {
return window.history.back()
}
forward() {
return window.history.forward()
}
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})()
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}
createRouter()
notifyNav(getFullSlug(window))
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if (!customElements.get("route-announcer")) {
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const attrs = {
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"aria-live": "assertive",
"aria-atomic": "true",
style:
"position: absolute; left: 0; top: 0; clip: rect(0 0 0 0); clip-path: inset(50%); overflow: hidden; white-space: nowrap; width: 1px; height: 1px",
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}
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customElements.define(
"route-announcer",
class RouteAnnouncer extends HTMLElement {
constructor() {
super()
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}
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connectedCallback() {
for (const [key, value] of Object.entries(attrs)) {
this.setAttribute(key, value)
}
}
},
)
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}