potato-load.min.js

(function(window){var isElementInViewport=function(el){var rect=el.getBoundingClientRect();return!(rect.left>(window.innerWidth||document.documentElement.clientWidth)||rect.right<0||rect.top>(window.innerHeight||document.documentElement.clientHeight)||rect.bottom<0)};var check=function(el){if(isElementInViewport(el)){el.setAttribute("src",el.getAttribute("data-src"))}};var debounce=function(func,wait,options){var context,args,result;var timeout=null;var previous=0;options||(options={});var later=function(){previous=options.leading===false?0:new Date;timeout=null;result=func.apply(context,args)};return function(){var now=new Date;if(!previous&&options.leading===false)previous=now;var remaining=wait-(now-previous);context=this;args=arguments;if(remaining<=0){clearTimeout(timeout);timeout=null;previous=now;result=func.apply(context,args)}else if(!timeout&&options.trailing!==false){timeout=setTimeout(later,remaining)}return result}};window.potatoload=function(selector){var elements=Array.prototype.slice.call(document.querySelectorAll(selector));elements.forEach(function(el,idx){window.addEventListener("scroll",debounce(check.bind(this,el),100));check(el)})}})(window);