Slideshow with Filter Reveal Effect

import { preloadImages } from './utils';
import { Slideshow } from './slideshow';
import gsap from 'gsap';

// body element
const bodyEl = document.body;
// body color
const bodyColor = getComputedStyle(bodyEl).getPropertyValue('--color-bg');
// Three Slideshow instances: main, and two for the navigation items
const slideshowMain = new Slideshow(document.querySelector('.slideshow > div.slides'));
const slideshowNavNext = new Slideshow(document.querySelector('.slideshow nav.nav--next .slides'), {duration: 1, filtersAnimation: false});
const slideshowNavPrev = new Slideshow(document.querySelector('.slideshow nav.nav--prev .slides'), {duration: 1, filtersAnimation: false});
// Nav controls to navigate the main slideshow
const navCtrls = {
    prev: document.querySelector('.slideshow nav.nav--prev'),
    next: document.querySelector('.slideshow nav.nav--next')
};
// title elements
const titleElems = [...document.querySelectorAll('.meta__content > .meta__content-title')];

// Animates the body color
const animateBodyBGColor = () => {
    
    gsap.timeline()
    .to(bodyEl, {
        duration: slideshowMain.duration/2,
        ease: 'power3.in',
        backgroundColor: '#2b0889'
    }, 'start')
    .to(bodyEl, {
        duration: slideshowMain.duration,
        ease: 'power3',
        backgroundColor: bodyColor
    }, 'start+=' + slideshowMain.duration/2);

}

// Set the current slide
slideshowMain.setInitialSlide();
// Set up the current slide values for the navigation elements, which are based on the slideshowMain's current value
slideshowNavPrev.setInitialSlide(slideshowMain.current ? slideshowMain.current - 1 : slideshowMain.slidesTotal - 1);
slideshowNavNext.setInitialSlide(slideshowMain.current < slideshowMain.slidesTotal - 1 ? slideshowMain.current + 1 : 0);

// Set initial title
gsap.set(titleElems[slideshowMain.current], {opacity: 1});

// Change slides for the three slideshows
const onClickNavCtrlEv = (dir) => {
    
    if ( slideshowMain.isAnimating ) return;

    // Slide out current title
    gsap.to(titleElems[slideshowMain.current], {
        duration: slideshowMain.duration/2,
        ease: 'power3.in',
        y: dir === 'next' ? '-100%' : '100%',
        opacity: 0
    });

    slideshowMain[dir]();
    slideshowNavPrev[dir]();
    slideshowNavNext[dir]();
    animateBodyBGColor();

    // Slide in the new (current) title
    gsap.to(titleElems[slideshowMain.current], {
        duration: slideshowMain.duration/2,
        ease: 'power3',
        startAt: {y: dir === 'next' ? '100%' : '-100%'},
        y: '0%',
        opacity: 1,
        delay: slideshowMain.duration/2
    });

};
navCtrls.prev.addEventListener('click', () => onClickNavCtrlEv('prev'));
navCtrls.next.addEventListener('click', () => onClickNavCtrlEv('next'));


// Preload images then remove loader (loading class) 
preloadImages('.slides__img-inner').then(() => document.body.classList.remove('loading'));

import gsap from "gsap/gsap-core";

/** 
 * Class representing an image slide, 
 * where each one consists of an outer element and an inner element that contains a background image.
 * */
export class Slide {
    // DOM elements
    DOM = {
        // Wrapper element (outer element)
        outer: null,
        // Image element (inner element)
        inner: null
    };

    constructor(DOM_el) {

        this.DOM.outer = DOM_el;
        this.DOM.inner = this.DOM.outer.children[0];

    }
}

import { Slide } from './slide';
import { gsap } from 'gsap';

export class Slideshow {
    
    // DOM elements
    DOM = {
        // Main element .slides
        el: null,
        // .slides__img elements
        slides: null
    };
    // Slide instances array
    slidesArr = [];
    // Current slide's index
    current = 0;
    // Total number of slides
    slidesTotal;
    // Current Slide
    currentSlide;
    // Animation's direction (left or right)
    direction;
    // Checks if the slideshow is running
    isAnimating = false;
    // Animation's duration and easing
    duration = 1.2;
    ease = 'power3.inOut';
    // Use a filter (brighness) animation when transitioning from one slide to another
    filtersAnimation = true;

    constructor(DOM_el, options = {} ) {
        
        this.DOM.el = DOM_el;

        // Some options
        this.duration = options.duration != undefined ? options.duration : this.duration;
        this.ease = options.ease != undefined ? options.ease : this.ease;
        this.filtersAnimation = options.filtersAnimation != undefined ? options.filtersAnimation : this.filtersAnimation;

        this.DOM.slides = this.DOM.el.querySelectorAll('.slides__img');
        
        // Create a Slide for each .slides__img element
        this.DOM.slides.forEach(slideEl => this.slidesArr.push(new Slide(slideEl)));

        this.slidesTotal = this.DOM.slides.length;

    }

    /**
     * Set the current slide
     * @param {number} position - The position of the slide.
     */
    setInitialSlide(position = this.current) {
        
        // Update current
        this.current = position;
        // The current Slide
        this.currentSlide = this.slidesArr[this.current];
        // Set current image
        this.DOM.slides[this.current].classList.add('slides__img--current');

    }

    /**
     * Navigate the slideshow to the next slide.
     */
    next() {

        // Return if anything is running
        if ( this.isAnimating ) return;

        // direction
        this.direction = 'next';

        // Update current
        this.current = this.current < this.slidesTotal - 1 ? this.current+1 : 0;

        // Animate to a different slide
        this.navigate();

    }

    /**
     * Navigate the slideshow to the previous slide.
     */
    prev() {

        // Return if anything is running
        if ( this.isAnimating ) return;

        // direction
        this.direction = 'prev';

        // Update current
        this.current = this.current > 0 ? this.current-1 : this.slidesTotal - 1;

        // Animate to a different slide
        this.navigate();

    }

    /**
     * Navigate to a different slide
     * @param {number} position - The position of the new slide.
     */
    navigate(position = this.current) {

        this.isAnimating = true;

        // Update current
        this.current = position;

        // Upcoming Slide
        this.upcomingSlide = this.slidesArr[this.current];

        // Animation
        this.timeline = gsap.timeline({
            defaults: {
                duration: this.duration,
                ease: this.ease
            },
            onComplete: () => {
                // Current class switch
                this.currentSlide.DOM.outer.classList.remove('slides__img--current');
                this.upcomingSlide.DOM.outer.classList.add('slides__img--current');
                // Update current Slide
                this.currentSlide = this.slidesArr[this.current];

                this.isAnimating = false;
            }
        })
        .addLabel('start', 0)
        
        // Upcoming Slide gets shown behind the current Slide animates out
        .set(this.upcomingSlide.DOM.outer, {
            opacity: 1
        }, 'start')
        
        // outer/inner opposite translations (Reveal effect)
        .to(this.currentSlide.DOM.outer, {
            x: this.direction === 'next' ? '-101%' : '101%',
            onComplete: () => gsap.set(this.currentSlide.DOM.outer, {x: '0%', opacity: 0})
        }, 'start')
        .to(this.currentSlide.DOM.inner, {
            x: this.direction === 'next' ? '101%' : '-101%',
            onComplete: () => gsap.set(this.currentSlide.DOM.inner, {x: '0%'})
        }, 'start')
        
        // Filters animation
        if ( this.filtersAnimation ) {
            
            this.timeline.to(this.currentSlide.DOM.inner, {
                startAt: {filter: 'brightness(100%)'},
                filter: 'brightness(800%)',
                onComplete: () => gsap.set(this.currentSlide.DOM.inner, {filter: 'brightness(100%)'})
            }, 'start')
            .to(this.upcomingSlide.DOM.inner, {
                startAt: {filter: 'brightness(800%)'},
                filter: 'brightness(100%)'
            }, 'start');

        }
        

    }
}

const imagesLoaded = require('imagesloaded');

// Preload images
const preloadImages = (selector = 'img') => {
    return new Promise((resolve) => {
        imagesLoaded(document.querySelectorAll(selector), {background: true}, resolve);
    });
};

export { 
    preloadImages
};

README.md
## Credits

- Images from [Unsplash](https://unsplash.com/)


## License
[MIT](LICENSE)

Made with :blue_heart:  by [Codrops](http://www.codrops.com)

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Retrieved: 2026-09-22T04:22:49.089Z
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 Effective date: April 30, 2025

 Last modified date: May 30, 2025

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