Lazyload background-image with lazysizes

Question

I want to load a background-image "lazy" with the library http://afarkas.github.io/lazysizes/
They do mention that the loading of "anything" lazily is possible. But the whole documentation on that is that one:

<div data-ride="carousel" data-script="assets/js/bootstrap.min.js" class="carousel lazyload">
    <!-- widget content -->
<div>

And I don't get how I could use that for a background-image. Does anybody have experience there on that?

Answer 1

To load a background image using lazysizes use the data-bg attribute

import "lazysizes/plugins/unveilhooks/ls.unveilhooks";

Usage example:

<div class="lazyload" data-bg="/path/to/image.jpg"></div>

Answer 2

If you want to load background image using lazyload just you need to add one small block of code (No need to add any plugin) -

//add simple support for background images:
document.addEventListener('lazybeforeunveil', function(e){
    var bg = e.target.getAttribute('data-bg');
    if(bg){
        e.target.style.backgroundImage = 'url(' + bg + ')';
    }
});

Answer 3

If you want to load an image as background, follow this doc. This is a plugin of lazysizes

Answer 4

Probably someone may find this useful. In my case, using the same library - "lazysizes" I had to change data-bg for data-bgset:

<div class="lazyload" data-bgset=""></div>