On-Scroll Animation and View Switch

import { preloadImages, isInViewport } from './utils';
import { Item } from './item';
import Lenis from '@studio-freight/lenis'
import { gsap } from 'gsap';
import { ScrollTrigger } from 'gsap/ScrollTrigger';
gsap.registerPlugin(ScrollTrigger);
import { Flip } from 'gsap/Flip';
gsap.registerPlugin(Flip);

// Item instances (Item is the .content > figure.item)
const items = [];
[...document.querySelectorAll('.item')].forEach(item => {
	items.push(new Item(item));
});

// Toggle grid view
const switchCtrl = {
    grid: document.querySelector('.switch__button--grid'),
    list: document.querySelector('.switch__button--list')
};

// Text element that moves horizontally as we scroll
const heading = {
    el: document.querySelector('.heading'),
    main: document.querySelector('.heading .heading__main'),
}

// Placeholder for the grid items (.item__image). We'll use the gsap FLIP plugin to move the "".item .item__image" inside the grid element
const grid = document.querySelector('.grid');

// Lenis smooth scrolling
let lenis;

// Initialize Lenis smooth scrolling
const initSmoothScrolling = () => {
	lenis = new Lenis({
		lerp: 0.1,
		smooth: true,
	});
	const scrollFn = (time) => {
		lenis.raf(time);
		requestAnimationFrame(scrollFn);
	};
	requestAnimationFrame(scrollFn);
};

// ScrollTrigger animations for scrolling
const animateOnScroll = () => {

	for (const item of items) {
        
		gsap.set(item.DOM.imageInner, {transformOrigin: '50% 0%'});

        gsap.timeline({
			scrollTrigger: {
				trigger: item.DOM.el,
                start: 'top bottom',
				end: 'bottom top',
				scrub: true
			}
		})
		.addLabel('start', 0)
        // scale up the inner image
        .to(item.DOM.imageInner, {
			ease: 'none',
			scaleY: 2.4,
            scaleX: 1.2,
            opacity: 0
		}, 'start')
        // translate the title and number
		.to([item.DOM.title, item.DOM.number], {
			ease: 'none',
			yPercent: -150,
		}, 'start')
        // translate the inner title/number (overflow is hidden so they get hidden)
        .to([item.DOM.titleInner, item.DOM.numberInner], {
            scrollTrigger: {
                trigger: item.DOM.el,
                start: 'top bottom',
				end: 'top 20%',
				scrub: true,
            },
			ease: 'expo.in',
            yPercent: -100
		}, 'start')
        /*
        .to(item.DOM.description, {
            scrollTrigger: {
                trigger: item.DOM.el,
                start: 'top bottom',
				end: 'bottom top',
				scrub: true,
            },
			ease: 'none',
            yPercent: 100
		}, 'start')
        */
        
	}

    // animate the heading element as we scroll (horizontally)
    let windowWidth = window.innerWidth;
    gsap.to(heading.main, {
        scrollTrigger: {
            start: 0,
            end: 'max',
            scrub: true
        },
        ease: 'none',
        x: () => -heading.main.offsetWidth - (13.25*windowWidth/100 + 25*windowWidth/100 + windowWidth/100) + windowWidth
    });
};

const showGrid = () => {
    
    document.body.classList.add('grid-open');
    
    // stop the smooth scrolling
    lenis.stop();
    
    // get the DOM elements that we'll work with
    const DOM = getDOMElements();

    // Disable active ScrollTrigger instances
    let Alltrigger = ScrollTrigger.getAll();
    for (let i = 0; i < Alltrigger.length; i++) {
        Alltrigger[i].disable(false);
    }

    // Use gsap flip for the animation
    // save the current state of the images
    const flipstate = Flip.getState(DOM.allImages);
    // put them inside the .grid element
    grid.append(...DOM.allImages);

    // gsap stagger properties
    const staggerConfig = {
        grid: 'auto',
        // the order goes from the first item inside the viewport
        from: DOM.inViewportItems.length ? items.indexOf(DOM.inViewportItems[0]) : 0,
        amount: 0.06,
    };

    // Flip it
    Flip.from(flipstate, {
        duration: 0.7,
        ease: 'power3.inOut',
        scale: true,
        stagger: staggerConfig
    })
    // Also reset scales applied to the inner images (items inside the viewport)
    .to(DOM.inViewportImagesInner, {
        duration: 0.7,
        ease: 'power3.inOut',
        scaleX: 1,
        scaleY: 1,
        opacity: 1,
        stagger: staggerConfig
    }, 0)
    // For the items outside of the viewport, simply reset the scales with no animation
    .set(DOM.outViewportImagesInner, {
        scaleX: 1,
        scaleY: 1,
        opacity: 1
    }, 0)
    // hide the titles and numbers inner elments by translating them up
    .to([DOM.inViewportTitlesInner, DOM.inViewportNumbersInner], {
        duration: 0.4,
        ease: 'power3.inOut',
        yPercent: -100,
        opacity: 0
    }, 0)
    // hide description
    .to(DOM.inViewportDescription, {
        duration: 0.4,
        ease: 'power3.inOut',
        opacity: 0
    }, 0)
    // For all the items outside the viewport, simply set opacity to 0
    .set([DOM.outViewportTitlesInner, DOM.outViewportNumbersInner, DOM.outViewportDescription], {
        opacity: 0,
    }, 0) 
    // hide the heading element
    .to(heading.el, {
        duration: 0.7,
        ease: 'power3.inOut',
        yPercent: -100,
        x: -100
    }, 0);

};

const hideGrid = () => {

    document.body.classList.remove('grid-open');

    // restart the smooth scrolling
    lenis.start();
    
    // get the DOM elements that we'll work with
    const DOM = getDOMElements();

    const flipstate = Flip.getState([DOM.allImages, DOM.allImagesInner], {props: 'opacity'});

    DOM.allImages.forEach((image,pos) => {
        items[pos].DOM.imageWrap.appendChild(image)
    });
    
    // Enable ScrollTrigger instances
    let Alltrigger = ScrollTrigger.getAll();
    for (let i = 0; i < Alltrigger.length; i++) {
        Alltrigger[i].enable(false);
    }

    Flip.from(flipstate, {
        duration: 0.7,
        ease: 'power3.inOut',
        scale: true,
    })
    .to([DOM.inViewportTitlesInner, DOM.inViewportNumbersInner, DOM.inViewportDescription], {
        duration: 0.4,
        ease: 'power3.inOut',
        startAt: {opacity: 0},
        opacity: 1
    }, 0)
    .set([DOM.outViewportTitlesInner, DOM.outViewportNumbersInner, DOM.outViewportDescription], {
        opacity: 1
    }, 0)
    .to(heading.el, {
        duration: 0.7,
        ease: 'power3.inOut',
        yPercent: 0,
        x: 0
    }, 0);

}

// Returns some DOM elements that are needed for showing/hiding the grid
const getDOMElements = () => {
    const inViewportItems = items.filter(item => isInViewport(item.DOM.el));
    const outViewportItems = items.filter(n => !inViewportItems.includes(n));

    return {
        allImages: items.map(item => item.DOM.image),
        allImagesInner: items.map(item => item.DOM.imageInner),
        inViewportItems: inViewportItems,
        outViewportItems: outViewportItems,
        inViewportImagesInner: inViewportItems.map(item => item.DOM.imageInner),
        outViewportImagesInner: outViewportItems.map(item => item.DOM.imageInner),
        inViewportDescription: inViewportItems.map(item => item.DOM.description),
        outViewportDescription: outViewportItems.map(item => item.DOM.description),
        inViewportTitlesInner: inViewportItems.map(item => item.DOM.titleInner),
        outViewportTitlesInner: outViewportItems.map(item => item.DOM.titleInner),
        inViewportNumbersInner: inViewportItems.map(item => item.DOM.numberInner),
        outViewportNumbersInner: outViewportItems.map(item => item.DOM.numberInner)
    };
}

// Initialize the events
const initEvents = () => {

    // show grid ctrl click
    switchCtrl.grid.addEventListener('click', () => {
        switchCtrl.grid.classList.add('switch__button--hidden', 'switch__button--current');
        switchCtrl.list.classList.remove('switch__button--hidden', 'switch__button--current');
        showGrid();
    });
    // hide grid ctrl click
    switchCtrl.list.addEventListener('click', () => {
        switchCtrl.list.classList.add('switch__button--hidden', 'switch__button--current');
        switchCtrl.grid.classList.remove('switch__button--hidden', 'switch__button--current');
        hideGrid();
    });

};

// Preload images
preloadImages('.item__image-inner').then(() => {
    document.body.classList.remove('loading');

    initSmoothScrolling();
    animateOnScroll();
    initEvents();
});

/**
 * Class representing an Item element (.item)
 */
export class Item {
	// DOM elements
	DOM = {
		// main element (.item)
		el: null,
        // caption (.item__caption)
        caption : null,
        // imageWrap (.item__image-wrap)
        imageWrap: null,
        // image (.item__image)
        image: null,
        // imageInner (.item__image > .item__image-inner)
        imageInner: null,
        // title (.item__caption-title)
        title: null,
        // titleInner (.item__caption-title > .oh__inner)
        titleInner: null,
        // number (.item__caption-number)
        number: null,
        // numberInner (.item__caption-number > .oh__inner)
        numberInner: null,
        // description (.item__caption-description)
        description: null,
	};
	
	/**
	 * Constructor.
	 * @param {Element} DOM_el - main element (.item)
	 */
	constructor(DOM_el) {
		this.DOM.el = DOM_el;
        this.DOM.caption = this.DOM.el.querySelector('.item__caption');
        this.DOM.imageWrap = this.DOM.el.querySelector('.item__image-wrap');
        this.DOM.image = this.DOM.el.querySelector('.item__image');
        this.DOM.imageInner = this.DOM.image.querySelector('.item__image-inner');
        this.DOM.title = this.DOM.el.querySelector('.item__caption-title');
        this.DOM.titleInner = this.DOM.title.querySelector('.oh__inner');
        this.DOM.number = this.DOM.el.querySelector('.item__caption-number');
        this.DOM.numberInner = this.DOM.number.querySelector('.oh__inner');
        this.DOM.description = this.DOM.el.querySelector('.item__caption-description');
	}
}

const imagesLoaded = require('imagesloaded');

const body = document.body;
export const preloader = selector => {
    return new Promise(resolve => {

        const imgwrap = document.createElement('div');
        imgwrap.style.visibility = 'hidden';
        body.appendChild(imgwrap);
        
        [...document.querySelectorAll(selector)].forEach(el => {
            const imgEl = document.createElement('img');
            imgEl.style.width = 0;
            imgEl.src = el.getAttributeNS('http://www.w3.org/1999/xlink', 'href');
            imgEl.className = 'preload';
            imgwrap.appendChild(imgEl);
        });

        imagesLoaded(document.querySelectorAll('.preload'), () => {
            imgwrap.parentNode.removeChild(imgwrap);
            body.classList.remove('loading');
            resolve();
        });

    });
};

const imagesLoaded = require('imagesloaded');

/**
 * Preload images
 * @param {String} selector - Selector/scope from where images need to be preloaded. Default is 'img'
 */
const preloadImages = (selector = 'img') => {
    return new Promise((resolve) => {
        imagesLoaded(document.querySelectorAll(selector), {background: true}, resolve);
    });
};

/**
 * Wraps the elements of an array.
 * @param {Array} arr - the array of elements to be wrapped
 * @param {String} wrapType - the type of the wrap element ('div', 'span' etc)
 * @param {String} wrapClass - the wrap class(es)
 */
 const wrapLines = (arr, wrapType, wrapClass) => {
    arr.forEach(el => {
        const wrapEl = document.createElement(wrapType);
        wrapEl.classList = wrapClass;
        el.parentNode.appendChild(wrapEl);
        wrapEl.appendChild(el);
    });
}

/**
 * Checks if an element is in the viewport
 * @param {Element} elem - the element to be checked
 */
 const isInViewport = elem => {
    var bounding = elem.getBoundingClientRect();
    return (
        (bounding.bottom >= 0 && bounding.bottom <= (window.innerHeight || document.documentElement.clientHeight) || bounding.top >= 0 && bounding.top <= (window.innerHeight || document.documentElement.clientHeight)) &&
        (bounding.right >= 0 && bounding.right <= (window.innerWidth || document.documentElement.clientWidth) || bounding.left >= 0 && bounding.left <= (window.innerWidth || document.documentElement.clientWidth))
    );
};

export {
    preloadImages,
    wrapLines,
    isInViewport,
};

README.md
## Credits

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


## License
[MIT](LICENSE)

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

MIT License

Copyright (c) 2009 - 2021 [Codrops](https://tympanus.net/codrops)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

GSAP standard license snapshot
Source: https://gsap.com/community/standard-license/
Retrieved: 2026-09-22T04:22:49.089Z
Original distribution copyright and version headers remain in the runtime code.

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 Effective date: April 30, 2025

 Last modified date: May 30, 2025

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ev-emitter@2.1.2 — LICENSE.md
Copyright (c) 2016-2021 [David DeSandro](https://desandro.com)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


imagesloaded@5.0.0 — LICENSE.md
Copyright (c) 2011-2022 [David DeSandro](https://desandro.com) and [contributors](https://github.com/desandro/imagesloaded/graphs/contributors)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


tiny-emitter@2.1.0 — LICENSE
The MIT License (MIT)

Copyright (c) 2017 Scott Corgan

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



virtual-scroll@2.2.1 — LICENSE
The MIT License (MIT)

Copyright (c) 2014 Florian Morel

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.