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Edit File: sinatra-slider.js

/**
 * Sinatra hover slider
 *
 * @since 1.0.0
 */
var sinatraHoverSlider = function(el) {

var current = 0,
		spinner = el.querySelector( '.si-spinner' );

// Hide spinner
	var hideSpinner = function() {

spinner.classList.remove( 'visible' );
		
		setTimeout( function() {
			spinner.style.display = 'none';
		}, 300 );

el.querySelector( '.hover-slider-backgrounds' ).classList.add( 'loaded' );
	};

el.querySelector( '.hover-slide-bg' ).classList.add( 'active' );

// Set background images from data-background
	el.querySelectorAll( '.hover-slider-backgrounds .hover-slide-bg' ).forEach( ( item, i ) => {
		item.style.backgroundImage = 'url(' + item.getAttribute( 'data-background' ) + ')';

el.querySelector( '.hover-slider-items > div:nth-child(' + (i+1) + ')' ).style.setProperty('--bg-image', 'url("' + item.getAttribute( 'data-background' ) + '")' );
		
		item.removeAttribute( 'data-background' );
	})

// Wait for images to load
	imagesLoaded( el.querySelectorAll( '.hover-slider-backgrounds' ), { background: '.hover-slide-bg' }, function() {

var preloader = document.getElementById( 'si-preloader' );

// Wait for preloader to finish before we show fade in animation
		if ( null !== preloader && ! document.body.classList.contains( 'si-loaded' ) ) {
			document.body.addEventListener( 'si-preloader-done', function() {
				setTimeout( function() {
					hideSpinner();
				}, 300);
			});
		} else {
			setTimeout( function() {
				hideSpinner();
			}, 300);
		}
	});

// Change backgrounds on hover
	el.querySelectorAll( '.hover-slider-item-wrapper' ).forEach( ( item ) => {
		item.addEventListener( 'mouseenter', function() {

if ( current !== sinatraGetIndex(item) ) {
				current = sinatraGetIndex(item);

el.querySelectorAll( '.hover-slide-bg' ).forEach( ( item, i ) => {
					item.classList.remove( 'active' );

if ( i === current ) {
						item.classList.add( 'active' );							
					}
				})
			}
		});
	});

return el;
};

// Main
( function() {

// On ready event
	document.addEventListener( 'DOMContentLoaded', function () {

// Init sliders
		document.querySelectorAll( '.si-hover-slider' ).forEach( ( item ) => {
			sinatraHoverSlider(item);
		});
	});
} )();

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