"Lazy Loading Images with placeholders"
Bootstrap 4.1.1 Snippet by Siddharth Panchal

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <!DOCTYPE html> <html lang="en"> <head> <title>Lazy loading images</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <section class="images"> <div class="slot"> <img class="lazy-load" src="https://cdn.somedomain.tech/placeholder/samples/trees.jpg" data-src="https://cdn.somedomain.tech/samples/trees.jpg"> </div> <div class="slot"> <img class="lazy-load" src="https://cdn.somedomain.tech/placeholder/samples/leaf.jpg" data-src="https://cdn.somedomain.tech/samples/leaf.jpg"> </div> <div class="slot"> <img width="2000" height="3000" class="lazy-load" src="https://cdn.somedomain.tech/samples/bar.jpg" data-src="https://cdn.somedomain.tech/samples/bar.jpg"> </div> <div class="slot"> <img class="lazy-load" src="https://cdn.somedomain.tech/placeholder/samples/lonely-house.jpg" data-src="https://cdn.somedomain.tech/samples/lonely-house.jpg"> </div> <div class="slot"> <img class="lazy-load" src="https://cdn.somedomain.tech/placeholder/samples/chair.jpg" data-src="https://cdn.somedomain.tech/samples/chair.jpg"> </div> <div class="slot"> <img class="lazy-load" src="https://cdn.somedomain.tech/placeholder/samples/pumpkins.jpg" data-src="https://cdn.somedomain.tech/samples/pumpkins.jpg"> </div> <div class="slot"> <img class="lazy-load" src="https://cdn.somedomain.tech/placeholder/samples/bridge.jpg" data-src="https://cdn.somedomain.tech/samples/bridge.jpg"> </div> <div class="slot"> <img class="lazy-load" src="https://cdn.somedomain.tech/placeholder/samples/purple.jpg" data-src="https://cdn.somedomain.tech/samples/purple.jpg"> </div> <div class="slot"> <img class="lazy-load" src="https://cdn.somedomain.tech/placeholder/samples/girl2.jpg" data-src="https://cdn.somedomain.tech/samples/girl2.jpg"> </div> <div class="slot"> <img class="lazy-load" src="https://cdn.somedomain.tech/placeholder/samples/hammock.jpg" data-src="https://cdn.somedomain.tech/samples/hammock.jpg"> </div> </section> </div> </body> </html>
.images{display: flex;flex-wrap: wrap;} .slot{width: 50%;} img{display: block;width: 100%;height: auto;}
$(document).ready(function(){ var images = document.querySelectorAll('img') var imageData = [] function replaceImage (node) { if ( node.getAttribute('data-lazyload-replaced') || (window.scrollY + window.innerHeight) <= node.offsetTop ) { return } var newImage = new Image() newImage.src = node.getAttribute('data-src') newImage.onload = (function (event) { setTimeout(function () { node.parentElement.replaceChild(newImage, node) }, Math.random() * 2000 + 500) }).bind(this) node.setAttribute('data-lazyload-replaced', true) } document.addEventListener('scroll', function (event) { for (var i = 0, numImages = images.length; i < numImages; i++) { replaceImage(images[i]) } }) for (var i = 0, numImages = images.length; i < numImages; i++) { images[i].onload = function (event) { replaceImage(event.target) } } });

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