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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,98 +1,91 @@ | ||
| /** | ||
| * yall.js version 1.1.0 | ||
| * yall.js version 1.1.1 | ||
| * Yet Another Lazy loader | ||
| * This library is intended to be very small. As such, some of may not be very readable. | ||
| * I don't normally code like this, but I wanted to see just how small I could get it! | ||
| **/ | ||
|
|
||
| (function(window, document){ | ||
| /** | ||
| * Everything below is defined in such a way to reduce | ||
| * uglifier output. If a method or string is only used once, it | ||
| * will be invoked normally. Otherwise, method shorthands are used. | ||
| **/ | ||
|
|
||
| var | ||
| // Placeholders used for common method names. | ||
| qsa = "querySelectorAll", | ||
| fe = "forEach", | ||
| pn = "parentNode", | ||
| pr = "prototype", | ||
| gbcr = "getBoundingClientRect", | ||
| io = "IntersectionObserver", | ||
| // Placeholders used for "data-src" and "data-srcset" attribute references. | ||
| dss = "data-srcset", | ||
| // Placeholders used for event handler strings. | ||
| y = ["scroll", "touchmove"], | ||
| z = ["orientationchange", "resize"], | ||
| documentEvents = ["scroll", "touchmove"], | ||
| windowEvents = ["orientationchange", "resize"], | ||
| // Tracks if yall is currently processing. Used for throttling. Only matters if IntersectionObserver is unsupported. | ||
| active = 0, | ||
| // Replaces target attribute value with source attribute, if applicable | ||
| replaceAttr = function(node, sattr, tattr){ | ||
| var v = node.getAttribute(sattr); | ||
| if(v){ | ||
| node[tattr] = v; | ||
| node.removeAttribute(sattr); | ||
| } | ||
| }, | ||
| // The handler to load the image | ||
| l = function(img){ | ||
| if(img[pn].tagName == "PICTURE"){ | ||
| Array[pr].slice.call(img[pn][qsa]("source"))[fe](function(source){ | ||
| ra(source, dss, "srcset"); | ||
| loadImage = function(img){ | ||
| if(img.parentNode.tagName == "PICTURE"){ | ||
| Array.prototype.slice.call(img.parentNode.querySelectorAll("source")).forEach(function(source){ | ||
| replaceAttr(source, "data-srcset", "srcset"); | ||
| }); | ||
| } | ||
|
|
||
| ra(img, "data-src", "src"); | ||
| ra(img, dss, "srcset"); | ||
| replaceAttr(img, "data-src", "src"); | ||
| replaceAttr(img, "data-srcset", "srcset"); | ||
| img.classList.remove("lazy"); | ||
| els.splice(els.indexOf(img), 1); | ||
| elements.splice(elements.indexOf(img), 1); | ||
| }, | ||
| // Tracks if yall is currently processing. Used for throttling. Only matters if IntersectionObserver is unsupported. | ||
| a = 0, | ||
| // A multiple event binding handler. | ||
| b = function(obj, handlers, fn, add){ | ||
| handlers[fe](function(handler){ | ||
| add ? obj.addEventListener(handler, fn) : obj.removeEventListener(handler, fn); | ||
| multiBind = function(obj, handlers, fn, remove){ | ||
| handlers.forEach(function(handler){ | ||
| remove ? obj.removeEventListener(handler, fn) : obj.addEventListener(handler, fn); | ||
| }); | ||
| }, | ||
| // Replaces target attribute value with source attribute, if applicable | ||
| ra = function(node, sattr, tattr){ | ||
| var v = node.getAttribute(sattr); | ||
| if(v){ | ||
| node[tattr] = v; | ||
| node.removeAttribute(sattr); | ||
| } | ||
| }, | ||
| // The guts of the lazy loader (now only used when IntersectionObserver is not supported) | ||
| ll = function(){ | ||
| if(!els.length) (b(document, y, ll), b(window, z, ll)); | ||
| yall = function(){ | ||
| if(!elements.length){ | ||
| multiBind(document, documentEvents, yall, 1); | ||
| multiBind(window, windowEvents, yall, 1); | ||
| } | ||
|
|
||
| if(!active){ | ||
| active = 1; | ||
|
|
||
| if(!a){ | ||
| a = 1; | ||
| setTimeout(function(){ | ||
| els[fe](function(img){ | ||
| if((img[gbcr]().top <= window.innerHeight && img[gbcr]().bottom >= 0) && getComputedStyle(img).display != "none") l(img); | ||
| elements.forEach(function(img){ | ||
| if((img.getBoundingClientRect().top <= window.innerHeight && img.getBoundingClientRect().bottom >= 0) && getComputedStyle(img).display != "none"){ | ||
| loadImage(img); | ||
| } | ||
| }); | ||
|
|
||
| a = 0; | ||
| active = 0; | ||
| }, 200); | ||
| } | ||
| }; | ||
|
|
||
| // Everything's kicked off on DOMContentLoaded | ||
| b(document, ["DOMContentLoaded"], function(){ | ||
| els = Array[pr].slice.call(document[qsa]("img.lazy")); | ||
| multiBind(document, ["DOMContentLoaded"], function(){ | ||
| elements = Array.prototype.slice.call(document.querySelectorAll("img.lazy")); | ||
|
|
||
| if(elements.length){ | ||
| // This compatibility check has been taken from https://github.com/WICG/IntersectionObserver/blob/gh-pages/polyfill/intersection-observer.js | ||
| if("IntersectionObserver" in window && "IntersectionObserverEntry" in window && "intersectionRatio" in IntersectionObserverEntry.prototype){ | ||
| ob = new IntersectionObserver(function(entries, observer){ | ||
| entries.forEach(function(entry){ | ||
| if(entry.isIntersecting){ | ||
| loadImage(entry.target); | ||
| if(!elements.length) observer.disconnect(); | ||
| } | ||
| }); | ||
| }); | ||
|
|
||
| if(els.length){ | ||
| if(io in window && io+"Entry" in window && "intersectionRatio" in window[io+"Entry"][pr]){ | ||
| els[fe](function(img){ | ||
| new window[io](function(entries, observer){ | ||
| entries[fe](function(entry){ | ||
| if(entry.isIntersecting){ | ||
| l(img); | ||
| observer.disconnect(); | ||
| } | ||
| }); | ||
| }).observe(img); | ||
| elements.forEach(function(img){ | ||
| ob.observe(img); | ||
| }); | ||
|
|
||
| return; | ||
| } | ||
|
|
||
| ll(); | ||
| b(document, y, ll, 1); | ||
| b(window, z, ll, 1); | ||
| // If IntersectionObserver isn't available, we'll do things the old way. | ||
| yall(); | ||
| multiBind(document, documentEvents, yall); | ||
| multiBind(window, windowEvents, yall); | ||
| } | ||
| }, 1); | ||
| }); | ||
| })(window, document); |
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