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/// <reference lib="dom" />
const duration = 0.2
globalThis.addEventListener("load", () => {
patch_page()
})
globalThis.addEventListener("popstate", ev => {
transition_to(window.location.href)
})
function patch_page() {
document.querySelectorAll("a").forEach(el => {
el.addEventListener("click", async ev => {
ev.preventDefault()
await transition_to(el.href)
})
})
}
async function transition_to(href) {
const trigger_load = prepare_load(href)
await fade(false)
trigger_load()
}
function prepare_load(href) {
const r_promise = fetch(href)
return async () => {
const r = await r_promise
const rt = await r.text()
const [head, body] = rt.split("<head>")[1].split("</body>")[0].split("</head><body>")
document.head.innerHTML = head
document.body.innerHTML = body
fade(true)
window.history.pushState({}, "", href)
patch_page()
}
}
function fade(dir) {
const overlay = document.createElement("div")
overlay.style.position = "absolute"
overlay.style.left = "0px"
overlay.style.top = "0px"
overlay.style.width = "100vw"
overlay.style.height = "100vh"
overlay.style.backgroundColor = dir ? "black" : "transparent"
overlay.style.transition = `background-color ${duration}s`
overlay.style.zIndex = 99999;
setTimeout(() => {
overlay.style.backgroundColor = dir ? "transparent" : "black"
}, 0)
document.body.appendChild(overlay)
return new Promise(res => {
setTimeout(() => {
if (dir) document.body.removeChild(overlay)
res()
}, duration * 1000)
})
}
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