Lightgallery custom events
This is just a demonstration of how to use custom events. You can find more custom events here. In this demo you will see background color of gallery changes on every slide
HTML structure
<div id="custom-events">
<a href="img/img1.jpg">
<img src="img/thumb1.jpg" />
</a>
<a href="img/img2.jpg">
<img src="img/thumb2.jpg" />
</a>
...
</div>
Javascript
var $customEvents = document.getElementById('custom-events');
lightGallery($customEvents);
var colours = ['rgb(33, 23, 26)', 'rgb(129, 87, 94)', 'rgb(156, 80, 67)', 'rgb(143, 101, 93)'];
$customEvents.addEventListener('onBeforeSlide', function(event) {
document.querySelector('.lg-outer').style.backgroundColor = colours[event.detail.index];
});
Css (for background color transition)
.lg-outer{
transition: background-color 600ms ease 0s;
}