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ðŸ“„ instant-page.js(5.98 KB)
ðŸ“„ instant-page.min.js(2.77 KB)

Editing: instant-page.js

let mouseoverTimer
let lastTouchTimestamp
const prefetches = new Set()
const prefetchElement = document.createElement('link')
const isSupported = prefetchElement.relList && prefetchElement.relList.supports && prefetchElement.relList.supports('prefetch')
	&& window.IntersectionObserver && 'isIntersecting' in IntersectionObserverEntry.prototype
const allowQueryString = 'instantAllowQueryString' in document.body.dataset
const allowExternalLinks = 'instantAllowExternalLinks' in document.body.dataset
const useWhitelist = 'instantWhitelist' in document.body.dataset
const mousedownShortcut = 'instantMousedownShortcut' in document.body.dataset
const DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION = 1111

let delayOnHover = 65
let useMousedown = false
let useMousedownOnly = false
let useViewport = false

if ('instantIntensity' in document.body.dataset) {
	const intensity = document.body.dataset.instantIntensity

if (intensity.substr(0, 'mousedown'.length) == 'mousedown') {
		useMousedown = true
		if (intensity == 'mousedown-only') {
			useMousedownOnly = true
		}
	}
	else if (intensity.substr(0, 'viewport'.length) == 'viewport') {
		if (!(navigator.connection && (navigator.connection.saveData || (navigator.connection.effectiveType && navigator.connection.effectiveType.includes('2g'))))) {
			if (intensity == "viewport") {
				/* Biggest iPhone resolution (which we want): 414 × 896 = 370944
				 * Small 7" tablet resolution (which we don’t want): 600 × 1024 = 614400
				 * Note that the viewport (which we check here) is smaller than the resolution due to the UI’s chrome */
				if (document.documentElement.clientWidth * document.documentElement.clientHeight < 450000) {
					useViewport = true
				}
			}
			else if (intensity == "viewport-all") {
				useViewport = true
			}
		}
	}
	else {
		const milliseconds = parseInt(intensity)
		if (!isNaN(milliseconds)) {
			delayOnHover = milliseconds
		}
	}
}

if (isSupported) {
	const eventListenersOptions = {
		capture: true,
		passive: true,
	}

if (!useMousedownOnly) {
		document.addEventListener('touchstart', touchstartListener, eventListenersOptions)
	}

if (!useMousedown) {
		document.addEventListener('mouseover', mouseoverListener, eventListenersOptions)
	}
	else if (!mousedownShortcut) {
		document.addEventListener('mousedown', mousedownListener, eventListenersOptions)
	}

if (mousedownShortcut) {
		document.addEventListener('mousedown', mousedownShortcutListener, eventListenersOptions)
	}

if (useViewport) {
		let triggeringFunction
		if (window.requestIdleCallback) {
			triggeringFunction = (callback) => {
				requestIdleCallback(callback, {
					timeout: 1500,
				})
			}
		}
		else {
			triggeringFunction = (callback) => {
				callback()
			}
		}

triggeringFunction(() => {
			const intersectionObserver = new IntersectionObserver((entries) => {
				entries.forEach((entry) => {
					if (entry.isIntersecting) {
						const linkElement = entry.target
						intersectionObserver.unobserve(linkElement)
						preload(linkElement.href)
					}
				})
			})

document.querySelectorAll('a').forEach((linkElement) => {
				if (isPreloadable(linkElement)) {
					intersectionObserver.observe(linkElement)
				}
			})
		})
	}
}

function touchstartListener(event) {
	/* Chrome on Android calls mouseover before touchcancel so `lastTouchTimestamp`
	 * must be assigned on touchstart to be measured on mouseover. */
	lastTouchTimestamp = performance.now()

const linkElement = event.target.closest('a')

if (!isPreloadable(linkElement)) {
		return
	}

preload(linkElement.href)
}

function mouseoverListener(event) {
	if (performance.now() - lastTouchTimestamp < DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION) {
		return
	}

const linkElement = event.target.closest('a')

if (!isPreloadable(linkElement)) {
		return
	}

linkElement.addEventListener('mouseout', mouseoutListener, {passive: true})

mouseoverTimer = setTimeout(() => {
		preload(linkElement.href)
		mouseoverTimer = undefined
	}, delayOnHover)
}

function mousedownListener(event) {
	const linkElement = event.target.closest('a')

if (!isPreloadable(linkElement)) {
		return
	}

preload(linkElement.href)
}

function mouseoutListener(event) {
	if (event.relatedTarget && event.target.closest('a') == event.relatedTarget.closest('a')) {
		return
	}

if (mouseoverTimer) {
		clearTimeout(mouseoverTimer)
		mouseoverTimer = undefined
	}
}

function mousedownShortcutListener(event) {
	if (performance.now() - lastTouchTimestamp < DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION) {
		return
	}

const linkElement = event.target.closest('a')

if (event.which > 1 || event.metaKey || event.ctrlKey) {
		return
	}

if (!linkElement) {
		return
	}

linkElement.addEventListener('click', function (event) {
		if (event.detail == 1337) {
			return
		}

event.preventDefault()
	}, {capture: true, passive: false, once: true})

const customEvent = new MouseEvent('click', {view: window, bubbles: true, cancelable: false, detail: 1337})
	linkElement.dispatchEvent(customEvent)
}

function isPreloadable(linkElement) {
	if (!linkElement || !linkElement.href) {
		return
	}

if (useWhitelist && !('instant' in linkElement.dataset)) {
		return
	}

if (!allowExternalLinks && linkElement.origin != location.origin && !('instant' in linkElement.dataset)) {
		return
	}

if (!['http:', 'https:'].includes(linkElement.protocol)) {
		return
	}

if (linkElement.protocol == 'http:' && location.protocol == 'https:') {
		return
	}

if (!allowQueryString && linkElement.search && !('instant' in linkElement.dataset)) {
		return
	}

if (linkElement.hash && linkElement.pathname + linkElement.search == location.pathname + location.search) {
		return
	}

if ('noInstant' in linkElement.dataset) {
		return
	}

return true
}

function preload(url) {
	if (prefetches.has(url)) {
		return
	}

const prefetcher = document.createElement('link')
	prefetcher.rel = 'prefetch'
	prefetcher.href = url
	document.head.appendChild(prefetcher)

prefetches.add(url)
}

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