Intersection Observer image lazy loading implementation method
This article mainly brings you an example of IntersectionObserver implementing lazy loading of images. The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let’s follow the editor to take a look, I hope it can help everyone.
API:
https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API
Go directly to the source code:
<!DOCTYPE html>
<html>
<header>
<style>
.list-item{
height: 400px;
margin: 5px;
background-color: lightblue;
list-style: none;
}
</style>
</header>
<body>
<li class="list-item"><img class="list-item-img" alt="loading" src='./images/icon1.png'></li>
<li class="list-item"><img class="list-item-img" alt="loading" src='./images/icon2.png'></li>
<li class="list-item"><img class="list-item-img" alt="loading" src='./images/icon3.png'></li>
<li class="list-item"><img class="list-item-img" alt="loading" src='./images/icon4.png'></li>
<li class="list-item"><img class="list-item-img" alt="loading" src='./images/icon5.png'></li>
<li class="list-item"><img class="list-item-img" alt="loading" src='./images/icon6.png'></li>
<script>
var observer = new IntersectionObserver(function(changes) {
console.log(changes);
changes.forEach(function(element, index) {
// statements
if (element.intersectionRatio > 0 && element.intersectionRatio <= 1) {
element.target.src = element.target.dataset.src;
}
});
});
function addObserver() {
var listItems = document.querySelectorAll('.list-item-img');
listItems.forEach(function(item) {
observer.observe(item);
});
}
addObserver();
</script>
</body>
</html>After running the code, I found that when scrolling the scroll axis, only When the
Compatible browsers:
desktop:
Mobile:
Related recommendations:
Use the vue-lazyload plug-in to lazily load images in vue
JS implementation of image lazy loading tutorial
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