diff --git a/README.md b/README.md index f85c7a1..9e045be 100644 --- a/README.md +++ b/README.md @@ -1,7 +1,7 @@ # yall.js (Yet Another Lazy Loader) ### (Y'all need to lazy load images) -yall.js is a very small image lazy loader for reasonably modern browsers (back to IE10) that weighs in at 1.09 KB uglified (657 bytes with gzip/554 bytes with Brotli). It depends on `classList`, `querySelectorAll`, and supports the `` element and `srcset`. yall.js will also use `IntersectionObserver` if available, but will fall back to more traditional means if it's not. If you want to try out yall.js, grab the copy in the `dist` folder. Or you can clone the repo and check out the `test` folder. If you want to tinker, work with the copy in the `src` folder and build using `npm run build` (requires `npx`). +yall.js is a very small image lazy loader for reasonably modern browsers (back to IE11) that weighs in at 1.1 KB uglified (650 bytes with gzip/545 bytes with Brotli). It depends on `classList`, `querySelectorAll`, and supports the `` element and `srcset`. yall.js will also use `IntersectionObserver` if available, but will fall back to more traditional means if it's not. If you want to try out yall.js, grab a copy from the releases tab. Or you can clone the repo and check out the `test` folder. If you want to tinker, work with the copy in the `src` folder and build using `npm run build` (requires `npx`). ## Usage Pattern @@ -64,12 +64,12 @@ yall.js also doesn't try to guess at placeholder sizes to minimize layout shifti ## Contributing -I'm not interested in expanding the functionality by much unless a good case can be made for increasing its performance without making it huge. The goal of yall.js is to be as small as reasonably possible while maintaining functionality. If you look at the source and can find ways to make this script's uglified output smaller than it already is without breaking it, I welcome your contributions. +I'm not interested in expanding the functionality by much unless a good case can be made for increasing its performance without making it huge. The goal of yall.js is to be as small as reasonably possible while maintaining functionality. ## Special thanks -Props to [Kamran Ayub](https://github.com/kamranayub) for his tremendous help with performance tuning this script. +Props to [Kamran Ayub](https://github.com/kamranayub) for his tremendous help with performance tuning this script, and to [Anthony Gore](https://twitter.com/anthonygore) for fixing an elusive bug in my intersection observer code where sometimes the last image on a page would not lazy load. ## Why another dumb lazy loader? -I explain how to write a lazy loader in Chapter 6 of my book [Web Performance in Action](https://www.manning.com/books/web-performance-in-action?a_aid=webopt&a_bid=63c31090) from Manning Publications. Otherwise, I wouldn't have bothered. The lazy loader in the book is much different than what you'll find here. +I explain how to write a lazy loader in Chapter 6 of my book [Web Performance in Action](https://www.manning.com/books/web-performance-in-action?a_aid=webopt&a_bid=63c31090) from Manning Publications. Otherwise, I wouldn't have bothered. The lazy loader in the book is much different (and more improved!) than what you'll find here. diff --git a/dist/yall-1.1.1.min.js b/dist/yall-1.1.1.min.js deleted file mode 100644 index 9c40586..0000000 --- a/dist/yall-1.1.1.min.js +++ /dev/null @@ -1 +0,0 @@ -!function(t,e){var n,i="forEach",o="querySelectorAll",r="parentNode",c="getBoundingClientRect",s="prototype",a="IntersectionObserver",u=a+"Entry",l="data-srcset",f=["scroll","touchmove"],g=["orientationchange","resize"],d=0,v=function(t,e,n){var i=t.getAttribute(e);i&&(t[n]=i,t.removeAttribute(e))},m=function(t){"PICTURE"==t[r].tagName&&Array[s].slice.call(t[r][o]("source"))[i](function(t){v(t,l,"srcset")}),v(t,"data-src","src"),v(t,l,"srcset"),t.classList.remove("lazy")},y=function(t,e,n,o){e[i](function(e){o?t.removeEventListener(e,n):t.addEventListener(e,n)})},b=function(){n.length||(y(e,f,b,1),y(t,g,b,1)),d||(d=1,setTimeout(function(){n[i](function(e){e[c]().top<=t.innerHeight&&e[c]().bottom>=0&&"none"!=getComputedStyle(e).display&&m(e)}),d=0},200))};y(e,["DOMContentLoaded"],function(){if((n=Array[s].slice.call(e[o]("img.lazy"))).length)if(a in t&&u in t&&"intersectionRatio"in t[u][s]){var r=new t[a](function(t,e){t[i](function(t){t.isIntersecting&&t.isIntersecting&&(m(t.target),r.unobserve(t.target))})});n[i](function(t){r.observe(t)})}else b(),y(e,f,b),y(t,g,b)})}(window,document); \ No newline at end of file diff --git a/dist/yall-1.1.2.min.js b/dist/yall-1.1.2.min.js new file mode 100644 index 0000000..b8a99b0 --- /dev/null +++ b/dist/yall-1.1.2.min.js @@ -0,0 +1 @@ +!function(t,e){var n,i="forEach",o="querySelectorAll",r="parentNode",c="getBoundingClientRect",s="prototype",a="IntersectionObserver",u=a+"Entry",l="data-srcset",f=["scroll","touchmove"],g=["orientationchange","resize"],d=0,v=function(t,e,n){var i=t.getAttribute(e);i&&(t[n]=i,t.removeAttribute(e))},m=function(t){"PICTURE"==t[r].tagName&&Array[s].slice.call(t[r][o]("source"))[i](function(t){v(t,l,"srcset")}),v(t,"data-src","src"),v(t,l,"srcset"),t.classList.remove("lazy"),n=n.filter(function(e){return e!==t})},y=function(t,e,n,o){e[i](function(e){o?t.removeEventListener(e,n):t.addEventListener(e,n)})},b=function(){n.length||(y(e,f,b,1),y(t,g,b,1)),d||(d=1,setTimeout(function(){n[i](function(e){e[c]().top<=t.innerHeight&&e[c]().bottom>=0&&"none"!=getComputedStyle(e).display&&m(e)}),d=0},200))};y(e,["DOMContentLoaded"],function(){if((n=Array[s].slice.call(e[o]("img.lazy"))).length)if(a in t&&u in t&&"intersectionRatio"in t[u][s]){var r=new t[a](function(t,e){t[i](function(t){t.isIntersecting&&(m(t.target),r.unobserve(t.target))})});n[i](function(t){r.observe(t)})}else b(),y(e,f,b),y(t,g,b)})}(window,document); \ No newline at end of file diff --git a/package-lock.json b/package-lock.json index dfcdd3d..ad590ef 100644 --- a/package-lock.json +++ b/package-lock.json @@ -1,6 +1,6 @@ { "name": "yall", - "version": "1.0.4", + "version": "1.1.2", "lockfileVersion": 1, "requires": true, "dependencies": { @@ -10,20 +10,4035 @@ "integrity": "sha512-b0553uYA5YAEGgyYIGYROzKQ7X5RAqedkfjiZxwi0kL1g3bOaBNNZfYkzt/CL0umgD5wc9Jec2FbB98CjkMRvQ==", "dev": true }, - "source-map": { - "version": "0.5.6", - "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.6.tgz", - "integrity": "sha1-dc449SvwczxafwwRjYEzSiu19BI=", - "dev": true + "npx": { + "version": "9.7.1", + "resolved": "https://registry.npmjs.org/npx/-/npx-9.7.1.tgz", + "integrity": 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"main": "./src/yall.js", "scripts": { @@ -24,7 +24,7 @@ "homepage": "https://github.com/malchata/yall.js#readme", "devDependencies": { "npx": "^9.7.1", - "uglify-js": "^3.0.27" + "uglify-js": "^3.1.5" }, "dependencies": {} } diff --git a/src/yall.js b/src/yall.js index 53a3628..8bed45a 100644 --- a/src/yall.js +++ b/src/yall.js @@ -16,12 +16,11 @@ pr = "prototype", io = "IntersectionObserver", ioe = io + "Entry", - ln = "length", dss = "data-srcset", // Placeholders used for event handler strings. documentEvents = ["scroll", "touchmove"], windowEvents = ["orientationchange", "resize"], - // Tracks if yall is currently processing. Used for throttling. Only matters if IntersectionObserver is unsupported. + // Tracks if yall is currently processing. Used for throttling. Only relevant if IntersectionObserver is unsupported. active = 0, // Placeholder for elements elements, @@ -45,6 +44,9 @@ replaceAttr(img, "data-src", "src"); replaceAttr(img, dss, "srcset"); img.classList.remove("lazy"); + elements = elements.filter(function(e){ + return e !== img; + }); }, // A multiple event binding handler. multiBind = function(obj, handlers, fn, remove){ @@ -54,7 +56,7 @@ }, // The guts of the lazy loader (now only used when IntersectionObserver is not supported) yall = function(){ - if(!elements[ln]){ + if(!elements.length){ // There are no more elements to lazy load, so we'll unbind everything. multiBind(document, documentEvents, yall, 1); multiBind(window, windowEvents, yall, 1); @@ -81,16 +83,14 @@ elements = Array[pr].slice.call(document[qsa]("img.lazy")); // We're only going to do stuff if we found `img.lazy` elements - if(elements[ln]){ + if(elements.length){ // This compatibility check has been taken from https://github.com/WICG/IntersectionObserver/blob/gh-pages/polyfill/intersection-observer.js if(io in window && ioe in window && "intersectionRatio" in window[ioe][pr]){ var imageObserver = new window[io](function(entries, observer){ entries[fe](function(entry){ if(entry.isIntersecting){ - if(entry.isIntersecting){ - loadImage(entry.target); - imageObserver.unobserve(entry.target); - } + loadImage(entry.target); + imageObserver.unobserve(entry.target); } }); }); diff --git a/test/index.html b/test/index.html index ed95fd6..f572c7c 100644 --- a/test/index.html +++ b/test/index.html @@ -84,6 +84,6 @@

Lazy loading <picture>

<noscript> fallback for <img> with src - +