var _extends=Object.assign||function(target){for(var i=1;i<arguments.length;i++){var source=arguments[i];for(var key in source){if(Object.prototype.hasOwnProperty.call(source,key)){target[key]=source[key];}}}return target;};var _typeof=typeof Symbol==="function"&&typeof Symbol.iterator==="symbol"?function(obj){return typeof obj;}:function(obj){return obj&&typeof Symbol==="function"&&obj.constructor===Symbol&&obj!==Symbol.prototype?"symbol":typeof obj;};(function(global,factory){(typeof exports==='undefined'?'undefined':_typeof(exports))==='object'&&typeof module!=='undefined'?module.exports=factory():typeof define==='function'&&define.amd?define(factory):global.LazyLoad=factory();})(this,function(){'use strict';var defaultSettings={elements_selector:"img",container:window,threshold:300,throttle:150,data_src:"src",data_srcset:"srcset",class_loading:"loading",class_loaded:"loaded",class_error:"error",class_initial:"initial",skip_invisible:true,callback_load:null,callback_error:null,callback_set:null,callback_processed:null,callback_enter:null};var isBot=!("onscroll"in window)||/glebot/.test(navigator.userAgent);var callCallback=function callCallback(callback,argument){if(callback){callback(argument);}};var getTopOffset=function getTopOffset(element){return element.getBoundingClientRect().top+window.pageYOffset-element.ownerDocument.documentElement.clientTop;};var isBelowViewport=function isBelowViewport(element,container,threshold){var fold=container===window?window.innerHeight+window.pageYOffset:getTopOffset(container)+container.offsetHeight;return fold<=getTopOffset(element)-threshold;};var getLeftOffset=function getLeftOffset(element){return element.getBoundingClientRect().left+window.pageXOffset-element.ownerDocument.documentElement.clientLeft;};var isAtRightOfViewport=function isAtRightOfViewport(element,container,threshold){var documentWidth=window.innerWidth;var fold=container===window?documentWidth+window.pageXOffset:getLeftOffset(container)+documentWidth;return fold<=getLeftOffset(element)-threshold;};var isAboveViewport=function isAboveViewport(element,container,threshold){var fold=container===window?window.pageYOffset:getTopOffset(container);return fold>=getTopOffset(element)+threshold+element.offsetHeight;};var isAtLeftOfViewport=function isAtLeftOfViewport(element,container,threshold){var fold=container===window?window.pageXOffset:getLeftOffset(container);return fold>=getLeftOffset(element)+threshold+element.offsetWidth;};var isInsideViewport=function isInsideViewport(element,container,threshold){return!isBelowViewport(element,container,threshold)&&!isAboveViewport(element,container,threshold)&&!isAtRightOfViewport(element,container,threshold)&&!isAtLeftOfViewport(element,container,threshold);};var createInstance=function createInstance(classObj,options){var event;var eventString="LazyLoad::Initialized";var instance=new classObj(options);try{event=new CustomEvent(eventString,{detail:{instance:instance}});}catch(err){event=document.createEvent("CustomEvent");event.initCustomEvent(eventString,false,false,{instance:instance});}
window.dispatchEvent(event);};var autoInitialize=function autoInitialize(classObj,options){var optsLength=options.length;if(!optsLength){createInstance(classObj,options);}else{for(var i=0;i<optsLength;i++){createInstance(classObj,options[i]);}}};var dataPrefix="data-";var getData=function getData(element,attribute){return element.getAttribute(dataPrefix+attribute);};var setData=function setData(element,attribute,value){return element.setAttribute(dataPrefix+attribute,value);};var setSourcesForPicture=function setSourcesForPicture(element,srcsetDataAttribute){var parent=element.parentNode;if(parent.tagName!=="PICTURE"){return;}
for(var i=0;i<parent.children.length;i++){var pictureChild=parent.children[i];if(pictureChild.tagName==="SOURCE"){var sourceSrcset=getData(pictureChild,srcsetDataAttribute);if(sourceSrcset){pictureChild.setAttribute("srcset",sourceSrcset);}}}};var setSources=function setSources(element,srcsetDataAttribute,srcDataAttribute){var tagName=element.tagName;var elementSrc=getData(element,srcDataAttribute);if(tagName==="IMG"){setSourcesForPicture(element,srcsetDataAttribute);var imgSrcset=getData(element,srcsetDataAttribute);if(imgSrcset){element.setAttribute("srcset",imgSrcset);}
if(elementSrc){element.setAttribute("src",elementSrc);}
return;}
if(tagName==="IFRAME"){if(elementSrc){element.setAttribute("src",elementSrc);}
return;}
if(elementSrc){element.style.backgroundImage='url("'+elementSrc+'")';}};var supportsClassList="classList"in document.createElement("p");var addClass=function addClass(element,className){if(supportsClassList){element.classList.add(className);return;}
element.className+=(element.className?" ":"")+className;};var removeClass=function removeClass(element,className){if(supportsClassList){element.classList.remove(className);return;}
element.className=element.className.replace(new RegExp("(^|\\s+)"+className+"(\\s+|$)")," ").replace(/^\s+/,"").replace(/\s+$/,"");};var LazyLoad=function LazyLoad(instanceSettings){this._settings=_extends({},defaultSettings,instanceSettings);this._queryOriginNode=this._settings.container===window?document:this._settings.container;this._previousLoopTime=0;this._loopTimeout=null;this._boundHandleScroll=this.handleScroll.bind(this);this._isFirstLoop=true;window.addEventListener("resize",this._boundHandleScroll);this.update();};LazyLoad.prototype={_reveal:function _reveal(element){var settings=this._settings;var errorCallback=function errorCallback(){if(!settings){return;}
element.removeEventListener("load",loadCallback);element.removeEventListener("error",errorCallback);removeClass(element,settings.class_loading);addClass(element,settings.class_error);callCallback(settings.callback_error,element);};var loadCallback=function loadCallback(){if(!settings){return;}
removeClass(element,settings.class_loading);addClass(element,settings.class_loaded);element.removeEventListener("load",loadCallback);element.removeEventListener("error",errorCallback);callCallback(settings.callback_load,element);};callCallback(settings.callback_enter,element);if(element.tagName==="IMG"||element.tagName==="IFRAME"){element.addEventListener("load",loadCallback);element.addEventListener("error",errorCallback);addClass(element,settings.class_loading);}
setSources(element,settings.data_srcset,settings.data_src);callCallback(settings.callback_set,element);},_loopThroughElements:function _loopThroughElements(){var settings=this._settings,elements=this._elements,elementsLength=!elements?0:elements.length;var i=void 0,processedIndexes=[],firstLoop=this._isFirstLoop;for(i=0;i<elementsLength;i++){var element=elements[i];if(settings.skip_invisible&&element.offsetParent===null){continue;}
if(isBot||isInsideViewport(element,settings.container,settings.threshold)){if(firstLoop){addClass(element,settings.class_initial);}
this._reveal(element);processedIndexes.push(i);setData(element,"was-processed",true);}}
while(processedIndexes.length){elements.splice(processedIndexes.pop(),1);callCallback(settings.callback_processed,elements.length);}
if(elementsLength===0){this._stopScrollHandler();}
if(firstLoop){this._isFirstLoop=false;}},_purgeElements:function _purgeElements(){var elements=this._elements,elementsLength=elements.length;var i=void 0,elementsToPurge=[];for(i=0;i<elementsLength;i++){var element=elements[i];if(getData(element,"was-processed")){elementsToPurge.push(i);}}
while(elementsToPurge.length>0){elements.splice(elementsToPurge.pop(),1);}},_startScrollHandler:function _startScrollHandler(){if(!this._isHandlingScroll){this._isHandlingScroll=true;this._settings.container.addEventListener("scroll",this._boundHandleScroll);}},_stopScrollHandler:function _stopScrollHandler(){if(this._isHandlingScroll){this._isHandlingScroll=false;this._settings.container.removeEventListener("scroll",this._boundHandleScroll);}},handleScroll:function handleScroll(){var throttle=this._settings.throttle;if(throttle!==0){var now=Date.now();var remainingTime=throttle-(now-this._previousLoopTime);if(remainingTime<=0||remainingTime>throttle){if(this._loopTimeout){clearTimeout(this._loopTimeout);this._loopTimeout=null;}
this._previousLoopTime=now;this._loopThroughElements();}else if(!this._loopTimeout){this._loopTimeout=setTimeout(function(){this._previousLoopTime=Date.now();this._loopTimeout=null;this._loopThroughElements();}.bind(this),remainingTime);}}else{this._loopThroughElements();}},update:function update(){this._elements=Array.prototype.slice.call(this._queryOriginNode.querySelectorAll(this._settings.elements_selector));this._purgeElements();this._loopThroughElements();this._startScrollHandler();},destroy:function destroy(){window.removeEventListener("resize",this._boundHandleScroll);if(this._loopTimeout){clearTimeout(this._loopTimeout);this._loopTimeout=null;}
this._stopScrollHandler();this._elements=null;this._queryOriginNode=null;this._settings=null;}};var autoInitOptions=window.lazyLoadOptions;if(autoInitOptions){autoInitialize(LazyLoad,autoInitOptions);}
return LazyLoad;});