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npofopr/lazy-loading.html

Forked from droganaida/lazy-loading.html
Created January 31, 2020 07:17
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Intersection Observer + custom lazy loading demo
Raw
lazy-loading.html
<html>
<head>
<title>Lazy loading by #Blondiecode</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
font-family: Arial, "Helvetica Neue", Helvetica, serif;
}
footer {
padding: 20px 0;
text-align: center;
}
h1, h2 {
width: 100%;
text-align: center;
}
a {
color: #777777;
}
a:hover {
color: #999999;
}
.wrapper {
width: 100%;
margin: 0 auto;
max-width: 1200px;
display: flex;
flex-wrap: wrap;
}
.item {
width: 25%;
box-sizing: border-box;
min-height: 400px;
min-width: 300px;
text-align: center;
}
.item.youtube {
width: 50%;
min-height: 315px;
overflow: visible;
}
.item.loading {
border: 1px dotted #a7a7a7;
position: relative;
}
.item.loading:after {
content: '';
position: absolute;
width: 50px;
left: 50%;
margin-left: -25px;
height: 50px;
top: 50%;
margin-top: -25px;
background: url("data:image/gif;base64,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");
}
.item img {
width: 100%;
height: 400px;
}
.item.youtube img {
height: 315px;
}
</style>
</head>
<body>
<main class="wrapper js">
<h1>Some cool cats for you ❤</h1>
<div class="item loading">
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=" data-src="http://placekitten.com/600/800" alt="meow" width="300" height="400">
</div>
<div class="item loading">
<img data-src="https://dummyimage.com/300x400/82A3A1/fff.jpg&text=cat">
</div>
<div class="item loading">
<img data-src="http://placekitten.com/g/600/800">
</div>
<div class="item loading">
<img data-src="http://placekitten.com/600/799">
</div>
<div class="item loading">
<img data-src="https://dummyimage.com/300x400/C0DFA1/fff.jpg&text=kitty">
</div>
<div class="item loading">
<img data-src="http://placekitten.com/g/300/400">
</div>
<div class="item loading">
<img data-src="http://placekitten.com/g/300/399">
</div>
<div class="item loading">
<img data-src="https://dummyimage.com/300x400/b38cc9/fff.jpg&text=purrrr">
</div>
<div class="item loading">
<img data-src="http://placekitten.com/300/399">
</div>
<div class="item loading">
<img data-src="https://dummyimage.com/300x400/9FC490/fff.jpg&text=meow">
</div>
<div class="item loading">
<img data-src="http://placekitten.com/300/400">
</div>
<div class="item loading">
<img data-src="http://placekitten.com/g/900/1200">
</div>
<h2>Some cool videos from me with love ❤</h2>
<div class="item youtube loading">
<iframe width="560" height="315" data-src="https://www.youtube.com/embed/pAsOU6RV0Ys" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
</div>
<div class="item youtube loading">
<iframe width="560" height="315" data-src="https://www.youtube.com/embed/fQQDeNtQW-4" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
</div>
</main>
<footer>
<small><a href="https://www.youtube.com/c/AidaDrogan" target="_blank">#BlondieCode © 2020</a></small>
</footer>
<script>
//============= dynamic placeholder for images
const placeholder = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=";
const targets = document.querySelectorAll('[data-src]');
targets.forEach(target => {
target.src = placeholder
});
//============= IntersectionObserver
const options = {
root: null,
rootMargin: '0px',
threshold: 0.05
};
const loadImage = function (entries, observer) {
entries.forEach(entry => {
if (entry.isIntersecting && entry.target.parentNode.classList.contains('loading')){
entry.target.src = entry.target.getAttribute('data-src');
entry.target.onload = () => {
entry.target.parentNode.classList.remove('loading');
entry.target.removeAttribute('data-src');
};
}
});
};
const observer = new IntersectionObserver(loadImage, options);
targets.forEach(target => {
observer.observe(target);
});
//============= lazy loading by Aida Drogan
// function isIntersecting(target) {
// const docViewTop = window.pageYOffset;
// const docViewBottom = docViewTop + window.innerHeight;
// const elemTop = docViewTop + target.getBoundingClientRect().top;
// const elemBottom = elemTop + target.height;
// return (((elemTop <= docViewBottom) && (elemTop >= docViewTop))
// || ((elemBottom <= docViewBottom) && (elemBottom >= docViewTop)));
// }
//
// const checkImages = function() {
// targets.forEach(target => {
// if (isIntersecting(target) && target.parentNode.classList.contains('loading')){
// target.src = target.getAttribute('data-src');
// target.onload = () => {
// target.parentNode.classList.remove('loading');
// target.removeAttribute('data-src');
// };
// }
// });
// };
//
// window.onload = checkImages;
// window.onscroll = checkImages;
</script>
</body>
</html>
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