/* InstantClick 3.0.1 | (C) 2014 Alexandre Dieulot | http://instantclick.io/license.html */ var InstantClick = function(document, location) { // Internal variables var $ua = navigator.userAgent, $hasTouch = 'createTouch' in document, $currentLocationWithoutHash, $urlToPreload, $preloadTimer, // Preloading-related variables $history = {}, $xhr, $url = false, $title = false, $mustRedirect = false, $body = false, $timing = {}, $isPreloading = false, $isWaitingForCompletion = false, $trackedAssets = [], // Variables defined by public functions $useWhitelist, $preloadOnMousedown, $delayBeforePreload, $eventsCallbacks = { fetch: [], receive: [], wait: [], change: [] } ////////// HELPERS ////////// function removeHash(url) { var index = url.indexOf('#') if (index < 0) { return url } return url.substr(0, index) } function getLinkTarget(target) { while (target.nodeName != 'A') { target = target.parentNode } return target } function isBlacklisted(elem) { do { if (!elem.hasAttribute) { // Parent of break } if (elem.hasAttribute('data-instant')) { return false } if (elem.hasAttribute('data-no-instant')) { return true } } while (elem = elem.parentNode); return false } function isWhitelisted(elem) { do { if (!elem.hasAttribute) { // Parent of break } if (elem.hasAttribute('data-no-instant')) { return false } if (elem.hasAttribute('data-instant')) { return true } } while (elem = elem.parentNode); return false } function triggerPageEvent(eventType, arg1) { for (var i = 0; i < $eventsCallbacks[eventType].length; i++) { $eventsCallbacks[eventType][i](arg1) } /* The `change` event takes one boolean argument: "isInitialLoad" */ } function changePage(title, body, newUrl, scrollY) { document.title = title document.documentElement.replaceChild(body, document.body) /* We cannot just use `document.body = doc.body`, it causes Safari (tested 5.1, 6.0 and Mobile 7.0) to execute script tags directly. */ if (newUrl) { history.pushState(null, null, newUrl) var hashIndex = newUrl.indexOf('#'), hashElem = hashIndex > -1 && document.getElementById(newUrl.substr(hashIndex + 1)), offset = 0 if (hashElem) { while (hashElem.offsetParent) { offset += hashElem.offsetTop hashElem = hashElem.offsetParent } } scrollTo(0, offset) $currentLocationWithoutHash = removeHash(newUrl) } else { scrollTo(0, scrollY) } instantanize() bar.done() triggerPageEvent('change', false) } function setPreloadingAsHalted() { $isPreloading = false $isWaitingForCompletion = false } ////////// EVENT HANDLERS ////////// function mousedown(e) { preload(getLinkTarget(e.target).href) } function mouseover(e) { var a = getLinkTarget(e.target) a.addEventListener('mouseout', mouseout) if (!$delayBeforePreload) { preload(a.href) } else { $urlToPreload = a.href $preloadTimer = setTimeout(preload, $delayBeforePreload) } } function touchstart(e) { var a = getLinkTarget(e.target) if ($preloadOnMousedown) { a.removeEventListener('mousedown', mousedown) } else { a.removeEventListener('mouseover', mouseover) } preload(a.href) } function click(e) { if (e.which > 1 || e.metaKey || e.ctrlKey) { // Opening in new tab return } e.preventDefault() display(getLinkTarget(e.target).href) } function mouseout() { if ($preloadTimer) { clearTimeout($preloadTimer) $preloadTimer = false return } if (!$isPreloading || $isWaitingForCompletion) { return } $xhr.abort() setPreloadingAsHalted() } function readystatechange() { if ($xhr.readyState < 4) { return } if ($xhr.status == 0) { /* Request aborted */ return } $timing.ready = +new Date - $timing.start triggerPageEvent('receive') if ($xhr.getResponseHeader('Content-Type').match(/\/(x|ht|xht)ml/)) { var doc = document.implementation.createHTMLDocument('') doc.documentElement.innerHTML = $xhr.responseText $title = doc.title $body = doc.body var urlWithoutHash = removeHash($url) $history[urlWithoutHash] = { body: $body, title: $title, scrollY: urlWithoutHash in $history ? $history[urlWithoutHash].scrollY : 0 } var elems = doc.head.children, found = 0, elem, data for (var i = elems.length - 1; i >= 0; i--) { elem = elems[i] if (elem.hasAttribute('data-instant-track')) { data = elem.getAttribute('href') || elem.getAttribute('src') || elem.innerHTML for (var j = $trackedAssets.length - 1; j >= 0; j--) { if ($trackedAssets[j] == data) { found++ } } } } if (found != $trackedAssets.length) { $mustRedirect = true // Assets have changed } } else { $mustRedirect = true // Not an HTML document } if ($isWaitingForCompletion) { $isWaitingForCompletion = false display($url) } } ////////// MAIN FUNCTIONS ////////// function instantanize(isInitializing) { var as = document.getElementsByTagName('a'), a, domain = location.protocol + '//' + location.host for (var i = as.length - 1; i >= 0; i--) { a = as[i] if (a.target // target="_blank" etc. || a.hasAttribute('download') || a.href.indexOf(domain + '/') != 0 // Another domain, or no href attribute || (a.href.indexOf('#') > -1 && removeHash(a.href) == $currentLocationWithoutHash) // Anchor || ($useWhitelist ? !isWhitelisted(a) : isBlacklisted(a)) ) { continue } a.addEventListener('touchstart', touchstart) if ($preloadOnMousedown) { a.addEventListener('mousedown', mousedown) } else { a.addEventListener('mouseover', mouseover) } a.addEventListener('click', click) } if (!isInitializing) { var scripts = document.body.getElementsByTagName('script'), script, copy, parentNode, nextSibling for (i = 0, j = scripts.length; i < j; i++) { script = scripts[i] if (script.hasAttribute('data-no-instant')) { continue } copy = document.createElement('script') if (script.src) { copy.src = script.src } if (script.innerHTML) { copy.innerHTML = script.innerHTML } parentNode = script.parentNode nextSibling = script.nextSibling parentNode.removeChild(script) parentNode.insertBefore(copy, nextSibling) } } } function preload(url) { if (!$preloadOnMousedown && 'display' in $timing && +new Date - ($timing.start + $timing.display) < 100) { /* After a page is displayed, if the user's cursor happens to be above a link a mouseover event will be in most browsers triggered automatically, and in other browsers it will be triggered when the user moves his mouse by 1px. Here are the behavior I noticed, all on Windows: - Safari 5.1: auto-triggers after 0 ms - IE 11: auto-triggers after 30-80 ms (depends on page's size?) - Firefox: auto-triggers after 10 ms - Opera 18: auto-triggers after 10 ms - Chrome: triggers when cursor moved - Opera 12.16: triggers when cursor moved To remedy to this, we do not start preloading if last display occurred less than 100 ms ago. If they happen to click on the link, they will be redirected. */ return } if ($preloadTimer) { clearTimeout($preloadTimer) $preloadTimer = false } if (!url) { url = $urlToPreload } if ($isPreloading && (url == $url || $isWaitingForCompletion)) { return } $isPreloading = true $isWaitingForCompletion = false $url = url $body = false $mustRedirect = false $timing = { start: +new Date } triggerPageEvent('fetch') $xhr.open('GET', url) $xhr.send() } function display(url) { if (!('display' in $timing)) { $timing.display = +new Date - $timing.start } if ($preloadTimer) { /* Happens when there’s a delay before preloading and that delay hasn't expired (preloading didn't kick in). */ if ($url && $url != url) { /* Happens when the user clicks on a link before preloading kicks in while another link is already preloading. */ location.href = url return } preload(url) bar.start(0, true) triggerPageEvent('wait') $isWaitingForCompletion = true return } if (!$isPreloading || $isWaitingForCompletion) { /* If the page isn't preloaded, it likely means the user has focused on a link (with his Tab key) and then pressed Return, which triggered a click. Because very few people do this, it isn't worth handling this case and preloading on focus (also, focusing on a link doesn't mean it's likely that you'll "click" on it), so we just redirect them when they "click". It could also mean the user hovered over a link less than 100 ms after a page display, thus we didn't start the preload (see comments in `preload()` for the rationale behind this.) If the page is waiting for completion, the user clicked twice while the page was preloading. Either on the same link or on another link. If it's the same link something might have gone wrong (or he could have double clicked), so we send him to the page the old way. If it's another link, it hasn't been preloaded, so we redirect the user the old way. */ location.href = url return } if ($mustRedirect) { location.href = $url return } if (!$body) { bar.start(0, true) triggerPageEvent('wait') $isWaitingForCompletion = true return } $history[$currentLocationWithoutHash].scrollY = pageYOffset setPreloadingAsHalted() changePage($title, $body, $url) } ////////// PROGRESS BAR FUNCTIONS ////////// var bar = function() { var $barContainer, $barElement, $barTransformProperty, $barProgress, $barTimer function init() { $barContainer = document.createElement('div') $barContainer.id = 'instantclick' $barElement = document.createElement('div') $barElement.id = 'instantclick-bar' $barElement.className = 'instantclick-bar' $barContainer.appendChild($barElement) var vendors = ['Webkit', 'Moz', 'O'] $barTransformProperty = 'transform' if (!($barTransformProperty in $barElement.style)) { for (var i = 0; i < 3; i++) { if (vendors[i] + 'Transform' in $barElement.style) { $barTransformProperty = vendors[i] + 'Transform' } } } var transitionProperty = 'transition' if (!(transitionProperty in $barElement.style)) { for (var i = 0; i < 3; i++) { if (vendors[i] + 'Transition' in $barElement.style) { transitionProperty = '-' + vendors[i].toLowerCase() + '-' + transitionProperty } } } var style = document.createElement('style') style.innerHTML = '#instantclick{position:' + ($hasTouch ? 'absolute' : 'fixed') + ';top:0;left:0;width:100%;pointer-events:none;z-index:2147483647;' + transitionProperty + ':opacity .25s .1s}' + '.instantclick-bar{background:#29d;width:100%;margin-left:-100%;height:2px;' + transitionProperty + ':all .25s}' /* We set the bar's background in `.instantclick-bar` so that it can be overriden in CSS with `#instantclick-bar`, as IDs have higher priority. */ document.head.appendChild(style) if ($hasTouch) { updatePositionAndScale() addEventListener('resize', updatePositionAndScale) addEventListener('scroll', updatePositionAndScale) } } function start(at, jump) { $barProgress = at if (document.getElementById($barContainer.id)) { document.body.removeChild($barContainer) } $barContainer.style.opacity = '1' if (document.getElementById($barContainer.id)) { document.body.removeChild($barContainer) /* So there's no CSS animation if already done once and it goes from 1 to 0 */ } update() if (jump) { setTimeout(jumpStart, 0) /* Must be done in a timer, otherwise the CSS animation doesn't happen. */ } clearTimeout($barTimer) $barTimer = setTimeout(inc, 500) } function jumpStart() { $barProgress = 10 update() } function inc() { $barProgress += 1 + (Math.random() * 2) if ($barProgress >= 98) { $barProgress = 98 } else { $barTimer = setTimeout(inc, 500) } update() } function update() { $barElement.style[$barTransformProperty] = 'translate(' + $barProgress + '%)' if (!document.getElementById($barContainer.id)) { document.body.appendChild($barContainer) } } function done() { if (document.getElementById($barContainer.id)) { clearTimeout($barTimer) $barProgress = 100 update() $barContainer.style.opacity = '0' /* If you're debugging, setting this to 0.5 is handy. */ return } /* The bar container hasn't been appended: It's a new page. */ start($barProgress == 100 ? 0 : $barProgress) /* $barProgress is 100 on popstate, usually. */ setTimeout(done, 0) /* Must be done in a timer, otherwise the CSS animation doesn't happen. */ } function updatePositionAndScale() { /* Adapted from code by Sam Stephenson and Mislav Marohnić http://signalvnoise.com/posts/2407 */ $barContainer.style.left = pageXOffset + 'px' $barContainer.style.width = innerWidth + 'px' $barContainer.style.top = pageYOffset + 'px' var landscape = 'orientation' in window && Math.abs(orientation) == 90, scaleY = innerWidth / screen[landscape ? 'height' : 'width'] * 2 /* We multiply the size by 2 because the progress bar is harder to notice on a mobile device. */ $barContainer.style[$barTransformProperty] = 'scaleY(' + scaleY + ')' } return { init: init, start: start, done: done } }() ////////// PUBLIC VARIABLE AND FUNCTIONS ////////// var supported = 'pushState' in history && (!$ua.match('Android') || $ua.match('Chrome/')) && location.protocol != "file:" /* The state of Android's AOSP browsers: 2.3.7: pushState appears to work correctly, but `doc.documentElement.innerHTML = body` is buggy. See details here: http://stackoverflow.com/q/21918564 Note an issue anymore, but it may fail where 3.0 do, this needs testing again. 3.0: pushState appears to work correctly (though the URL bar is only updated on focus), but `document.documentElement.replaceChild(doc.body, document.body)` throws DOMException: WRONG_DOCUMENT_ERR. 4.0.2: Doesn't support pushState. 4.0.4, 4.1.1, 4.2, 4.3: pushState is here, but it doesn't update the URL bar. (Great logic there.) 4.4: Works correctly. Claims to be 'Chrome/30.0.0.0'. All androids tested with Android SDK's Emulator. Version numbers are from the browser's user agent. Because of this mess, the only whitelisted browser on Android is Chrome. */ function init() { if ($currentLocationWithoutHash) { /* Already initialized */ return } if (!supported) { triggerPageEvent('change', true) return } for (var i = arguments.length - 1; i >= 0; i--) { var arg = arguments[i] if (arg === true) { $useWhitelist = true } else if (arg == 'mousedown') { $preloadOnMousedown = true } else if (typeof arg == 'number') { $delayBeforePreload = arg } } $currentLocationWithoutHash = removeHash(location.href) $history[$currentLocationWithoutHash] = { body: document.body, title: document.title, scrollY: pageYOffset } var elems = document.head.children, elem, data for (var i = elems.length - 1; i >= 0; i--) { elem = elems[i] if (elem.hasAttribute('data-instant-track')) { data = elem.getAttribute('href') || elem.getAttribute('src') || elem.innerHTML /* We can't use just `elem.href` and `elem.src` because we can't retrieve `href`s and `src`s from the Ajax response. */ $trackedAssets.push(data) } } $xhr = new XMLHttpRequest() $xhr.addEventListener('readystatechange', readystatechange) instantanize(true) bar.init() triggerPageEvent('change', true) addEventListener('popstate', function() { var loc = removeHash(location.href) if (loc == $currentLocationWithoutHash) { return } if (!(loc in $history)) { location.href = location.href /* Reloads the page while using cache for scripts, styles and images, unlike `location.reload()` */ return } $history[$currentLocationWithoutHash].scrollY = pageYOffset $currentLocationWithoutHash = loc changePage($history[loc].title, $history[loc].body, false, $history[loc].scrollY) }) } function on(eventType, callback) { $eventsCallbacks[eventType].push(callback) } /* The debug function isn't included by default to reduce file size. To enable it, add a slash at the beginning of the comment englobing the debug function, and uncomment "debug: debug," in the return statement below the function. */ /* function debug() { return { currentLocationWithoutHash: $currentLocationWithoutHash, history: $history, xhr: $xhr, url: $url, title: $title, mustRedirect: $mustRedirect, body: $body, timing: $timing, isPreloading: $isPreloading, isWaitingForCompletion: $isWaitingForCompletion } } //*/ //////////////////// return { // debug: debug, supported: supported, init: init, on: on } }(document, location);