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scroll-snap.html
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scroll-snap.html
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<!doctype html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="/style.css">
</head>
<style>
html, body {
padding: 0;
position: absolute;
left: 0;
right: 0;
font-size: 20px;
}
.gallery {
position: relative;
max-width: 800px;
padding: 0 10;
}
.gallery_scroller {
/* snap mandatory on horizontal axis */
scroll-snap-type: x mandatory;
overflow-x: scroll;
overflow-y: hidden;
display: flex;
align-items: center;
height: 500px;
/* Enable Safari touch scrolling physics which is needed for scroll snap */
-webkit-overflow-scrolling: touch;
}
.gallery_scroller div {
/* snap align center */
scroll-snap-align: center;
margin: 10px;
position: relative;
}
.gallery_scroller img {
border-radius: 10px;
}
.gallery_scroller div.colored_card {
min-width: 75%;
min-height: 95%;
border-radius: 10px;
}
.gallery div.note {
position: absolute;
/* vertically align center */
top: 50%;
transform: translateY(-50%);
left: 0;
right: 0;
background: rgba(0,0,0, 0.6);
padding: 20px;
position: absolute;
font-size: 4em;
color: white;
}
.gallery .btn {
position: absolute;
top: 50%;
transform: translateY(-50%);
height: 30px;
width: 30px;
border-radius: 2px;
background-color: rgba(0,0,0,0.5);
background-position: 50% 50%;
background-repeat: no-repeat;
z-index: 1;
}
.gallery .btn.next {
background-image: url('data:image/svg+xml;charset=utf-8,<svg width="18" height="18" viewBox="0 0 34 34" xmlns="http://www.w3.org/2000/svg"><title>Shape</title><path d="M25.557 14.7L13.818 2.961 16.8 0l16.8 16.8-16.8 16.8-2.961-2.961L25.557 18.9H0v-4.2z" fill="%23FFF" fill-rule="evenodd"/></svg>');
right: 10px;
}
.gallery .btn.prev {
background-image: url('data:image/svg+xml;charset=utf-8,<svg width="18" height="18" viewBox="0 0 34 34" xmlns="http://www.w3.org/2000/svg"><title>Shape</title><path d="M33.6 14.7H8.043L19.782 2.961 16.8 0 0 16.8l16.8 16.8 2.961-2.961L8.043 18.9H33.6z" fill="%23FFF" fill-rule="evenodd"/></svg>');
left: 10px;
}
.gallery_scroller > div.colored_card:nth-of-type(1) { background-color: #e8eaf6; }
.gallery_scroller > div.colored_card:nth-of-type(2) { background-color: #c5cae9; }
.gallery_scroller > div.colored_card:nth-of-type(3) { background-color: #9fa8da; }
.gallery_scroller > div.colored_card:nth-of-type(4) { background-color: #7986cb; }
.gallery_scroller > div.colored_card:nth-of-type(5) { background-color: #5c6bc0; }
.gallery_scroller > div.colored_card:nth-of-type(6) { background-color: #3f51b5; }
.gallery_scroller > div.colored_card:nth-of-type(7) { background-color: #3949ab; }
.gallery_scroller > div.colored_card:nth-of-type(8) { background-color: #303f9f; }
.gallery_scroller > div.colored_card:nth-of-type(9) { background-color: #283593; }
.gallery_scroller > div.colored_card:nth-of-type(10) { background-color: #1a237e; }
</style>
<p>Below is a gallery where every item is the same size and centered. </p>
<label for="alignment">Alignment:</label>
<select id="alignment_option">
<option value="start">Start</option>
<option value="center" selected>Center</option>
<option value="end">End</option>
<option value="none">None</option>
</select>
<div id="paginated_gallery" class="gallery">
<div class="gallery_scroller">
<div class="colored_card"> </div>
<div class="colored_card"> </div>
<div class="colored_card"> </div>
<div class="colored_card"> </div>
<div class="colored_card"> </div>
<div class="colored_card"> </div>
<div class="colored_card"> </div>
<div class="colored_card"> </div>
<div class="colored_card"> </div>
<div class="colored_card"> </div>
</div>
<span class="btn prev"></span>
<span class="btn next"></span>
</div>
<p>
CSS Scroll Snapping works well even when snap targets have different size or
when they are larger than the scroller!
</p>
<div class="gallery">
<div class="gallery_scroller">
<div>
<img src="https://placeimg.com/480/480/animals/grayscale">
</div>
<div>
<img src="https://placeimg.com/360/480/animals/grayscale">
</div>
<div>
<img src="https://placeimg.com/640/480/animals/grayscale">
</div>
<div>
<img src="https://placeimg.com/360/360/animals/grayscale">
</div>
<div>
<img src="https://placeimg.com/2560/960/animals/grayscale">
<div class="note">Image is larger than container so it can be panned freely.</div>
</div>
<div>
<img src="https://placeimg.com/480/480/animals/grayscale">
</div>
<div>
<img src="https://placeimg.com/360/360/animals/grayscale">
</div>
<div>
<img src="https://placeimg.com/640/480/animals/grayscale">
</div>
</div>
</div>
<script>
document.querySelector('#alignment_option').addEventListener('change', updateAlignment);
const gallery = document.querySelector('#paginated_gallery');
const gallery_scroller = gallery.querySelector('.gallery_scroller');
const gallery_item_size = gallery_scroller.querySelector('div').clientWidth;
gallery.querySelector('.btn.next').addEventListener('click', scrollToNextPage);
gallery.querySelector('.btn.prev').addEventListener('click', scrollToPrevPage);
// For paginated scrolling, simply scroll the gallery one item in the given
// direction and let css scroll snaping handle the specific alignment.
function scrollToNextPage() {
gallery_scroller.scrollBy(gallery_item_size, 0);
}
function scrollToPrevPage() {
gallery_scroller.scrollBy(-gallery_item_size, 0);
}
function updateAlignment(event) {
const alignment = event.target.value;
for (item of gallery.querySelectorAll('.gallery_scroller > div'))
item.style.scrollSnapAlign = alignment;
// Currently changing scroll alignment does not force a re-snap in Chrome.
// This is a bug: http://crbug.com/866127
// In meantime, if desired a scroll snap can be triggered using a small
// scripted scroll e.g.: `gallery_scroller.scrollBy(1, 0);`
}
</script>
</html>