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✏️ Editing: lazyload.1.0.5.min.js

(function(window,document){"use strict";var lazyRocketsConfig;var docElem=document.documentElement;var addEventListener=window.addEventListener;var setTimeout=window.setTimeout;var rAF=window.requestAnimationFrame||setTimeout;var regPicture=/^picture$/i;var loadEvents=["load","error","lazyincluded","_lazyloaded"];var hasClass=function(ele,cls){var reg=new RegExp("(^|s)"+cls+"d(s|$)");return ele.className.match(cls)};var addClass=function(ele,cls){if(!hasClass(ele,cls)){ele.className+=" "+cls}};var removeClass=function(ele,cls){var reg;if(reg=hasClass(ele,cls)){ele.className=ele.className.replace(reg," ")}};var addRemoveLoadEvents=function(dom,fn,add){var action=add?"addEventListener":"removeEventListener";if(add){addRemoveLoadEvents(dom,fn)}loadEvents.forEach(function(evt){dom[action](evt,fn)})};var triggerEvent=function(elem,name,detail,noBubbles,noCancelable){var event=document.createEvent("CustomEvent");event.initCustomEvent(name,!noBubbles,!noCancelable,detail);event.details=event.detail;elem.dispatchEvent(event);return event};var updatePolyfill=function(el,full){var polyfill;if(!window.HTMLPictureElement){if(polyfill=window.picturefill||window.respimage||lazyRocketsConfig.pf){polyfill({reevaluate:true,reparse:true,elements:[el]})}else if(full&&full.src){el.src=full.src}}};var getCSS=function(elem,style){return getComputedStyle(elem,null)[style]};var prepareThrottledCheckElements=function(fn){var noPreparedElems=document.querySelectorAll("[data-lazy-src]:not(.lazyload),[data-lazy-original]:not(.lazyload)");for(var i=0;i<noPreparedElems.length;i++){addClass(noPreparedElems[i],lazyRocketsConfig.lazyClass)}};var throttle=function(fn){var running;var lastTime=0;var Date=window.Date;var run=function(){running=false;lastTime=Date.now();fn()};var afterAF=function(){setTimeout(run)};var getAF=function(){rAF(afterAF)};return function(force){if(running){return}var delay=lazyRocketsConfig.throttle-(Date.now()-lastTime);running=true;if(delay<4){delay=4}if(force===true){getAF()}else{setTimeout(getAF,delay)}}};var loader=function(){var lazyloadElems,preloadElems,isCompleted,resetPreloadingTimer,loadMode;var eLvW,elvH,eLtop,eLleft,eLright,eLbottom;var defaultExpand,preloadExpand;var regImg=/^img$/i;var regIframe=/^iframe$/i;var supportScroll="onscroll"in window&&!/glebot/.test(navigator.userAgent);var shrinkExpand=0;var currentExpand=0;var lowRuns=0;var isLoading=0;var resetPreloading=function(e){isLoading--;if(e&&e.target){addRemoveLoadEvents(e.target,resetPreloading)}if(!e||isLoading<0||!e.target){isLoading=0}};var isNestedVisible=function(elem,elemExpand){var outerRect;var parent=elem;var visible=getCSS(elem,"visibility")!="hidden";eLtop-=elemExpand;eLbottom+=elemExpand;eLleft-=elemExpand;eLright+=elemExpand;while(visible&&(parent=parent.offsetParent)){visible=(getCSS(parent,"opacity")||1)>0;if(visible&&getCSS(parent,"overflow")!="visible"){outerRect=parent.getBoundingClientRect();visible=eLright>outerRect.left&&eLleft<outerRect.right&&eLbottom>outerRect.top-1&&eLtop<outerRect.bottom+1}}return visible};var checkElements=function(){var eLlen,i,rect,autoLoadElem,loadedSomething,elemExpand,elemNegativeExpand,elemExpandVal,beforeExpandVal;if((loadMode=lazyRocketsConfig.loadMode)&&isLoading<8&&(eLlen=lazyloadElems.length)){i=0;lowRuns++;if(currentExpand<preloadExpand&&isLoading<1&&lowRuns>4&&loadMode>2){currentExpand=preloadExpand;lowRuns=0}else if(currentExpand!=defaultExpand&&loadMode>1&&lowRuns>3){currentExpand=defaultExpand}else{currentExpand=shrinkExpand}for(;i<eLlen;i++){if(!lazyloadElems[i]||lazyloadElems[i]._lazyRace){continue}if(!supportScroll){unveilElement(lazyloadElems[i]);continue}if(!(elemExpandVal=lazyloadElems[i].getAttribute("data-expand"))||!(elemExpand=elemExpandVal*1)){elemExpand=currentExpand}if(beforeExpandVal!==elemExpand){eLvW=innerWidth+elemExpand;elvH=innerHeight+elemExpand;elemNegativeExpand=elemExpand*-1;beforeExpandVal=elemExpand}rect=lazyloadElems[i].getBoundingClientRect();if((eLbottom=rect.bottom)>=elemNegativeExpand&&(eLtop=rect.top)<=elvH&&(eLright=rect.right)>=elemNegativeExpand&&(eLleft=rect.left)<=eLvW&&(eLbottom||eLright||eLleft||eLtop)&&(isCompleted&&isLoading<3&&lowRuns<4&&!elemExpandVal&&loadMode>2||isNestedVisible(lazyloadElems[i],elemExpand))){unveilElement(lazyloadElems[i],false,rect.width);loadedSomething=true}else if(!loadedSomething&&isCompleted&&!autoLoadElem&&isLoading<3&&lowRuns<4&&loadMode>2&&(preloadElems[0]||lazyRocketsConfig.preloadAfterLoad)&&(preloadElems[0]||!elemExpandVal&&(eLbottom||eLright||eLleft||eLtop))){autoLoadElem=preloadElems[0]||lazyloadElems[i]}}if(autoLoadElem&&!loadedSomething){unveilElement(autoLoadElem)}}};var throttledCheckElements=throttle(checkElements);var switchLoadingClass=function(e){addClass(e.target,lazyRocketsConfig.loadedClass);removeClass(e.target,lazyRocketsConfig.loadingClass);addRemoveLoadEvents(e.target,switchLoadingClass)};var changeIframeSrc=function(elem,src){if(elem.getAttribute("src")!=src){elem.setAttribute("src",src)}};var rafBatch=function(){var isRunning;var batch=[];var runBatch=function(){while(batch.length){batch.shift()()}isRunning=false};return function(fn){batch.push(fn);if(!isRunning){isRunning=true;rAF(runBatch)}}}();var unveilElement=function(elem,force,width){var sources,i,len,sourceSrcset,src,srcset,sizes,parent,isPicture,event,firesLoad,customMedia;var curSrc=elem.currentSrc||elem.src;var isImg=regImg.test(elem.nodeName);var sizes=null;var isAuto=sizes=="auto";if((isAuto||!isCompleted)&&isImg&&curSrc&&!elem.complete&&!hasClass(elem,lazyRocketsConfig.errorClass)){return}elem._lazyRace=true;isLoading++;rafBatch(function lazyUnveil(){if(elem._lazyRace){delete elem._lazyRace}removeClass(elem,lazyRocketsConfig.lazyClass);if(!(event=triggerEvent(elem,"lazybeforeunveil",{force:!!force})).defaultPrevented){srcset=elem.getAttribute("data-lazy-srcset");sizes=elem.getAttribute("data-lazy-sizes");src=elem.getAttribute("data-lazy-src")||elem.getAttribute("data-lazy-original");if(isImg){parent=elem.parentNode;isPicture=parent&&regPicture.test(parent.nodeName||"")}firesLoad=event.detail.firesLoad||"src"in elem&&(srcset||sizes||src||isPicture);event={target:elem};if(firesLoad){addRemoveLoadEvents(elem,resetPreloading,true);clearTimeout(resetPreloadingTimer);resetPreloadingTimer=setTimeout(resetPreloading,2500);addClass(elem,lazyRocketsConfig.loadingClass);addRemoveLoadEvents(elem,switchLoadingClass,true)}if(srcset){elem.setAttribute("srcset",srcset)}if(sizes){elem.setAttribute("sizes",sizes)}if(src){if(regIframe.test(elem.nodeName)){changeIframeSrc(elem,src)}else{elem.setAttribute("src",src)}}if(isPicture){updatePolyfill(elem,{src:src})}}if(!firesLoad||elem.complete&&curSrc==(elem.currentSrc||elem.src)){if(firesLoad){resetPreloading(event)}else{isLoading--}switchLoadingClass(event)}})};var onload=function(){var scrollTimer;var afterScroll=function(){lazyRocketsConfig.loadMode=3;throttledCheckElements()};isCompleted=true;lowRuns+=8;lazyRocketsConfig.loadMode=3;addEventListener("scroll",function(){if(lazyRocketsConfig.loadMode==3){lazyRocketsConfig.loadMode=2}clearTimeout(scrollTimer);scrollTimer=setTimeout(afterScroll,99)},true)};return{_:function(){lazyloadElems=document.getElementsByClassName(lazyRocketsConfig.lazyClass);preloadElems=document.getElementsByClassName(lazyRocketsConfig.lazyClass+" "+lazyRocketsConfig.preloadClass);defaultExpand=lazyRocketsConfig.expand;preloadExpand=Math.round(defaultExpand*lazyRocketsConfig.expFactor);addEventListener("scroll",throttledCheckElements,true);addEventListener("resize",throttledCheckElements,true);if(window.MutationObserver){new MutationObserver(prepareThrottledCheckElements).observe(docElem,{childList:true,subtree:true,attributes:true});new MutationObserver(throttledCheckElements).observe(docElem,{childList:true,subtree:true,attributes:true})}else{docElem.addEventListener("DOMNodeInserted",prepareThrottledCheckElements,true);docElem.addEventListener("DOMAttrModified",prepareThrottledCheckElements,true);setInterval(prepareThrottledCheckElements,999);docElem.addEventListener("DOMNodeInserted",throttledCheckElements,true);docElem.addEventListener("DOMAttrModified",throttledCheckElements,true);setInterval(throttledCheckElements,999)}addEventListener("hashchange",prepareThrottledCheckElements,true);["focus","mouseover","click","load","transitionend","animationend","webkitAnimationEnd"].forEach(function(name){document.addEventListener(name,throttledCheckElements,true)});if(!(isCompleted=/d$|^c/.test(document.readyState))){addEventListener("load",onload);document.addEventListener("DOMContentLoaded",throttledCheckElements)}else{onload()}throttledCheckElements(lazyloadElems.length>0)},checkElems:throttledCheckElements,unveil:unveilElement}}();var init=function(){if(!init.i){init.i=true;loader._()}};(function(){var prop;var lazyRocketsDefaults={lazyClass:"lazyload",loadedClass:"lazyloaded",loadingClass:"lazyloading",preloadClass:"lazypreload",errorClass:"lazyerror",autosizesClass:"lazyautosizes",init:true,expFactor:2,expand:359,loadMode:2,throttle:99};lazyRocketsConfig=window.lazyRocketsConfig||window.lazyRocketsConfig||{};for(prop in lazyRocketsDefaults){if(!(prop in lazyRocketsConfig)){lazyRocketsConfig[prop]=lazyRocketsDefaults[prop]}}window.lazyRocketsConfig=lazyRocketsConfig;setTimeout(function(){if(lazyRocketsConfig.init){var tmpElems=document.querySelectorAll("[data-lazy-src],[data-lazy-original]");for(var i=0;i<tmpElems.length;i++){addClass(tmpElems[i],lazyRocketsConfig.lazyClass)}init()}})})();return{cfg:lazyRocketsConfig,loader:loader,init:init,uP:updatePolyfill,aC:addClass,rC:removeClass,hC:hasClass,fire:triggerEvent}})(window,document);