Stripe-style Accordion Carousel In JavaScript

Preview:

Description:

An elegantly designed horizontal accordion carousel inspired by Stripe Sessions. Clicking on each carousel item will trigger an accordion-like expansion that reveals additional content or details.

Built with vanilla JavaScript and CSS Grid/Flex layout systems.

How to use it:

1. Add as many carousel items to the carousel list.

<section class="carousel">
  <ul class="carousel__list">
    <li class="carousel__item" tabindex="0">
      <div class="carousel__box">
        <div class="carousel__image"><img src="1.jpg"/></div>
        <div class="carousel__contents">
          <h2 class="user__name">User Name</h2>
          <h3 class="user__title">User Title</h3>
        </div>
      </div>
    </li>
    <li class="carousel__item" tabindex="0">
      <div class="carousel__box">
        <div class="carousel__image"><img src="2.jpg"/></div>
        <div class="carousel__contents">
          <h2 class="user__name">User Name</h2>
          <h3 class="user__title">User Title</h3>
        </div>
      </div>
    </li>
    ... more items here ...
  </ul>
  <!-- Carousel Controls -->
  <div class="carousel__nav">
    <button class="prev">
      <svg width="24" height="24" viewBox="0 0 24 24">
        <path d="M9.586 4l-6.586 6.586a2 2 0 0 0 0 2.828l6.586 6.586a2 2 0 0 0 2.18 .434l.145 -.068a2 2 0 0 0 1.089 -1.78v-2.586h7a2 2 0 0 0 2 -2v-4l-.005 -.15a2 2 0 0 0 -1.995 -1.85l-7 -.001v-2.585a2 2 0 0 0 -3.414 -1.414z"></path>
      </svg><span>prev</span>
    </button>
    <button class="next"><span>next</span>
      <svg width="24" height="24" viewBox="0 0 24 24">
        <path d="M12.089 3.634a2 2 0 0 0 -1.089 1.78l-.001 2.586h-6.999a2 2 0 0 0 -2 2v4l.005 .15a2 2 0 0 0 1.995 1.85l6.999 -.001l.001 2.587a2 2 0 0 0 3.414 1.414l6.586 -6.586a2 2 0 0 0 0 -2.828l-6.586 -6.586a2 2 0 0 0 -2.18 -.434l-.145 .068z"></path>
      </svg>
    </button>
  </div>
</section>

2. The necessary CSS styles for the carousel.

:root {
  --height: calc( 80vh - 50px );
  --width: 450px;
}
.carousel {
  display: grid;
  transform: translate3d(0,0,0.1px);
}
.carousel__list {
  display: flex;
  overflow: hidden;
  list-style: none;
  padding: 2em 0 3em;
  margin: 0;
  contain: layout;
  isolation: isolate;
}
.carousel__item {
  display: grid;
  position: relative;
  align-content: start;
  margin: 0 10px;
  padding: 0;
  flex: 1 1 10%;
  height: var(--height);
  overflow: hidden;
  background: rgba(255,255,255,0.2);
  border-radius: 16px;
  transform: translate3d(0,0,0.1px);
  box-shadow: rgba(0, 0, 0, 0.4) 0px 3px 15px 2px, rgba(0, 0, 0, 0.2) 0px 12px 28px 0px, rgba(0, 0, 0, 0.1) 0px 2px 4px 0px, rgba(255, 255, 255, 0.05) 0px 0px 0px 1px inset;
  contain: layout;
  isolation: isolate;
}
.carousel__item,
.carousel__item * {
  transition: all .6s cubic-bezier(.55,.24,.18,1);
  user-select: none;
}
.carousel__image,
.carousel__contents {
  width: var(--width);
  height: auto;
}
.carousel__item:hover {
  flex-basis: calc( var(--width) / 2 );
  transition: all 0.3s ease;
}
.carousel__item[data-active] {
  flex-basis: var(--width);
  flex-grow: 0;
}
@media screen and (max-width: 800px) {
  .carousel__item {
      flex-basis: 15%;
  }
}
@media screen and (max-width: 600px) {
  
  .carousel__item {
      flex-basis: 10%;
      margin: 0 5px;
      border-radius: 8px;
      font-size: 3vw;
  }
  
  .carousel__item[data-active] {
      flex-basis: 45%;
      flex-grow: 0;
  }
  .carousel__item:nth-child(3),
  .carousel__item:nth-child(7) {
      flex: 0 0 10px;
  }
  .carousel__item:nth-child(2),
  .carousel__item:nth-child(8) {
      flex: 0 0 5px;
      transform: translateX(-50px);
  }
  .carousel__item:nth-child(8) {
      transform: translateX(50px);
  }
  .carousel__item:nth-child( 1 ),
  .carousel__item:nth-child( n + 9 ) {
      flex: 0 0 0px;
      margin: 0;
      box-shadow: none;
      opacity: 0!important;
  }
  .carousel__item:not(:nth-child( n + 5 )) img,
  .carousel__item:nth-child( n + 7 ) img {
      opacity: 0.8;
  }
  .carousel__item:not(:nth-child( n + 4 )) *,
  .carousel__item:nth-child( n + 7 ) * {
      opacity: 0!important;
  }
  
}
@media screen and (min-width: 600px) {
  .carousel__item:nth-child(3),
  .carousel__item:nth-child(10) {
      flex: 0 0 10px;
  }
  .carousel__item:nth-child(2),
  .carousel__item:nth-child(11) {
      flex: 0 0 5px;
      transform: translateX(-50px);
  }
  .carousel__item:nth-child(11) {
      transform: translateX(50px);
  }
  .carousel__item:nth-child( 1 ),
  .carousel__item:nth-child( n + 12 ) {
      flex: 0 0 0px;
      margin: 0;
      box-shadow: none;
      opacity: 0!important;
  }
  .carousel__item:not(:nth-child( n + 5 )) img,
  .carousel__item:nth-child( n + 9 ) img {
      opacity: 0.8;
  }
  .carousel__item:not(:nth-child( n + 4 )) *,
  .carousel__item:nth-child( n + 10 ) * {
      opacity: 0!important;
  }
  
}
.carousel__item img {
  display: block;
  position: absolute;
  width: var(--width);
  height: 100%;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: -1;
  aspect-ratio: 2/3;
  object-fit: cover;
  filter: saturate(0.2) contrast(0.75) brightness(1.1);
}
.carousel__item::after {
  content: "";
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: 1;
  background: linear-gradient(160deg, rgba(2,0,36,0) 40%, rgba(118,221,136,.5) 70%, rgba(0,255,246,.6) 100%);
  transition: all .66s cubic-bezier(.55,.24,.18,1);
}
.carousel__item[data-active]::after {
  transform: translateY(100%);
}
.carousel__item[data-active],
.carousel__item[data-active] * {
  opacity: 1;
  filter: none;
}
.carousel__contents {
  display: flex;
  flex-direction: column-reverse;
  justify-content: start;
  min-height: 200px;
  padding: 1em;
  z-index: 2;
  background-image: radial-gradient( ellipse at 0px 0px, rgba(0,0,0,0.4) 20%, transparent 50% );
  background-size: 170% 200px;
  background-repeat: no-repeat;
  position: absolute;
  top: 0;
  left: 0;
}
.carousel__contents .user__name {
  color: #e8eff4;
  font-size: 1.75em;
  font-weight: 600;
  letter-spacing: .8px;
  text-shadow: 0 1px 0 rgba(0,0,0,0.3);
}
.carousel__contents .user__title {
  font-family: lexend;
  font-size: .875em;
  letter-spacing: 1.25px;
  font-weight: 500;
  text-transform: uppercase;
  color: transparent;
  background: linear-gradient( 270deg, rgb(67, 255, 0), rgb(0, 255, 247) );
  background-clip: text;
  -webkit-background-clip: text;
  opacity: 0.85;
  text-wrap: balance;
  margin-bottom: 0.5em;
}
.carousel__contents .user__title,
.carousel__contents .user__name {
  margin: 0;
  line-height: 1.1;
  opacity: 0;
  transform: translateX(-200px);
  transition-duration: 1s;
  max-width: 18em;
}
@media screen and (max-width: 800px) {
  .carousel__item img {
      width: calc(var(--width) * .5);
  }
  .carousel__contents {
      transform: translateX(-100%) rotate(90deg);
      transform-origin: bottom right;
      align-items: end;
      justify-content: end;
      background-image: radial-gradient( ellipse at 100% 100%, rgba(0, 0, 0,.4) 0%, transparent 50% );
      background-position: -100% 100%;
      flex-direction: column;
      position: absolute;
      bottom: 0;
      left: 0;
      text-align: right;
  }
  [data-active] .carousel__contents {
      background-position: 100% 100%;
  }
  .carousel__contents .user__title,
  .carousel__contents .user__name {
      max-width: 70vh;
      transform: translateX(200px);
  }
}
[data-active] .carousel__contents * {
  transform: translateX(0px); 
  transition-duration: 0.66s;
  opacity: 1;
}
[data-active] .carousel__contents .user__name {
  transition-delay: 0.1s;
}
[data-active] .carousel__contents .user__title {
  opacity: 0.85; 
  transition-delay: 0.05s;
}
/*
  Carousel Controls
*/
.carousel__nav {
  padding: 1em;
  justify-self: end;
  grid-row: 1;
  display: flex;
  justify-content: space-between;
  gap: 1em;
}
button {
  display: flex;
  gap: .5em;
  padding: 0.5em 1.5em;
}
button span,
button svg {
  margin: 0;
  padding: 0;
  fill: none;
}
button path {
  fill: currentColor;
}
body, html {
  padding: 0;
  align-items: start;
}

3. Activate the accordion carousel.

const d = document;
const $q = d.querySelectorAll.bind(d);
const $g = d.querySelector.bind(d);
const $prev = $g(".prev");
const $next = $g(".next");
const $list = $g(".carousel__list");
let auto;
let pauser;
const getActiveIndex = () => {
    const $active = $g("[data-active]");
    return getSlideIndex($active);
}
const getSlideIndex = ($slide) => {
    return [...$q(".carousel__item")].indexOf( $slide );
}
const prevSlide = () => {
    const index = getActiveIndex();
    const $slides = $q(".carousel__item");
    const $last = $slides[$slides.length-1];
    $last.remove();
    $list.prepend($last);
    activateSlide( $q(".carousel__item")[index] );
}
const nextSlide = () => {
    const index = getActiveIndex();
    const $slides = $q(".carousel__item");
    const $first = $slides[0];
    $first.remove();
    $list.append($first);
    activateSlide( $q(".carousel__item")[index] );
}
const chooseSlide = (e) => {
    const max = (window.matchMedia("screen and ( max-width: 600px)").matches) ? 5 : 8;
    const $slide = e.target.closest( ".carousel__item" );
    const index = getSlideIndex( $slide );
    if ( index < 3 || index > max ) return;
    if ( index === max ) nextSlide();
    if ( index === 3 ) prevSlide();
    activateSlide($slide);
}
const activateSlide = ($slide) => {
    if (!$slide) return;
    const $slides = $q(".carousel__item");
    $slides.forEach(el => el.removeAttribute('data-active'));
    $slide.setAttribute( 'data-active', true );
    $slide.focus();
}
const autoSlide = () => {
    nextSlide();
}
const pauseAuto = () => {
    clearInterval( auto );
    clearTimeout( pauser );
}
const handleNextClick = (e) => {
    pauseAuto();
    nextSlide(e);
}
const handlePrevClick = (e) => {
    pauseAuto();
    prevSlide(e);
}
const handleSlideClick = (e) => {
    pauseAuto();
    chooseSlide(e);
}
const handleSlideKey = (e) => {
    switch(e.keyCode) {
        case 37:
        case 65:
            handlePrevClick();
            break;
        case 39:
        case 68:
            handleNextClick();
            break;
    }
}
const startAuto = () => {
    auto = setInterval( autoSlide, 3000 );
}
startAuto();
$next.addEventListener( "click", handleNextClick );
$prev.addEventListener( "click", handlePrevClick );
// $list.addEventListener( "click", handleSlideClick );
$list.addEventListener( "focusin", handleSlideClick );
$list.addEventListener( "keyup", handleSlideKey );