Creates a horizontally scrollable image gallery.
display: flex
and justify-content: center
to setup the layout for the container.display: flex
and flex-direction: column
to setup the layout for the slides.scroll-snap-type: y mandatory
and overscroll-behavior-y: contain
to create a snap effect on vertical scroll. Snap elements to the start of the container using scroll-snap-align: start
.scrollbar-width: none
and styling the pseudo-element ::-webkit-scrollbar
to display: none
.Element.scrollTo()
to define a scrollToElement
function, that scrolls the gallery to the given item.Array.prototype.map()
and Array.prototype.join()
to populate the .thumbnails
element. Give each thumbnail a data-id
attribute with the index of the image.Document.querySelectorAll()
to get all the thumbnail elements. Use Array.prototype.forEach()
to register a handler for the 'click'
event on each thumbnail, using EventTarget.addEventListener()
and the scrollToElement
function.Document.querySelector()
and EventTarget.addEventListener()
to register a handler for the 'scroll'
event. Update the .thumbnails
and .scrollbar
elements to match the current scroll position, using the scrollThumb
function.<div class="gallery-container">
<div class="thumbnails"></div>
<div class="scrollbar">
<div class="thumb"></div>
</div>
<div class="slides">
<div><img src="https://picsum.photos/id/1067/540/720"></div>
<div><img src="https://picsum.photos/id/122/540/720"></div>
<div><img src="https://picsum.photos/id/188/540/720"></div>
<div><img src="https://picsum.photos/id/249/540/720"></div>
<div><img src="https://picsum.photos/id/257/540/720"></div>
<div><img src="https://picsum.photos/id/259/540/720"></div>
<div><img src="https://picsum.photos/id/283/540/720"></div>
<div><img src="https://picsum.photos/id/288/540/720"></div>
<div><img src="https://picsum.photos/id/299/540/720"></div>
</div>
</div>
.gallery-container {
display: flex;
justify-content: center;
}
.thumbnails {
display: flex;
flex-direction: column;
gap: 8px;
}
.thumbnails img {
width: 40px;
height: 40px;
cursor: pointer;
}
.scrollbar {
width: 1px;
height: 720px;
background: #ccc;
display: block;
margin: 0 0 0 8px;
}
.thumb {
width: 1px;
position: absolute;
height: 0;
background: #000;
}
.slides {
margin: 0 16px;
display: grid;
grid-auto-flow: row;
gap: 1rem;
width: calc(540px + 1rem);
padding: 0 0.25rem;
height: 720px;
overflow-y: auto;
overscroll-behavior-y: contain;
scroll-snap-type: y mandatory;
scrollbar-width: none;
}
.slides > div {
scroll-snap-align: start;
}
.slides img {
width: 540px;
object-fit: contain;
}
.slides::-webkit-scrollbar {
display: none;
}
const slideGallery = document.querySelector('.slides');
const slides = slideGallery.querySelectorAll('div');
const scrollbarThumb = document.querySelector('.thumb');
const slideCount = slides.length;
const slideHeight = 720;
const marginTop = 16;
const scrollThumb = () => {
const index = Math.floor(slideGallery.scrollTop / slideHeight);
scrollbarThumb.style.height = `${((index + 1) / slideCount) * slideHeight}px`;
};
const scrollToElement = el => {
const index = parseInt(el.dataset.id, 10);
slideGallery.scrollTo(0, index * slideHeight + marginTop);
};
document.querySelector('.thumbnails').innerHTML += [...slides]
.map(
(slide, i) => `<img src="${slide.querySelector('img').src}" data-id="${i}">`
)
.join('');
document.querySelectorAll('.thumbnails img').forEach(el => {
el.addEventListener('click', () => scrollToElement(el));
});
slideGallery.addEventListener('scroll', e => scrollThumb());
scrollThumb();
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