Hi!

I have a perfectly working script to toggle classes. ;-))

Now I have a gallery "lightgallery" which should control the toggle.

Instead of clicking on a button to toggle the classes, the classes should be toggled when the gallery opens.

I have this js to toggle my classes by click:

<code>

$(function() {
	
 $("#kuenstler").click(function(){
   $("body").toggleClass("scrolled-down-20"); }).scroll();
 });
</code>

This is the code provided by lightgallery:
<code>
    var $lg = $('#lightgallery');
     
    $lg.lightGallery();
     
    // Perform any action just before opening the gallery
    $lg.on('onBeforeOpen.lg',function(event){
        alert('onBeforeOpen');
    });
     
    // custom event with extra parameters 
    // index - index of the slide
    // fromTouch - true if slide function called via touch event or mouse drag
    // fromThumb - true if slide function called via thumbnail click
    $lg.on('onBeforeSlide.lg',function(event, index, fromTouch, fromThumb){
        console.log(index, fromTouch, fromThumb);
    });
</code>

snote