Carousel

A slideshow component for cycling through elements—images or slides of text—like a carousel.

On this page

How it works

The carousel is a slideshow for cycling through a series of content, built with CSS 3D transforms and a bit of JavaScript. It works with a series of images, text, or custom markup. It also includes support for previous/next controls and indicators.

In browsers where the Page Visibility API is supported, the carousel will avoid sliding when the webpage is not visible to the user (such as when the browser tab is inactive, the browser window is minimized, etc.).

The animation effect of this component is dependent on the prefers-reduced-motion media query. See the reduced motion section of our accessibility documentation.

Please be aware that nested carousels are not supported, and carousels are generally not compliant with accessibility standards.

Example

Carousels don’t automatically normalize slide dimensions. As such, you may need to use additional utilities or custom styles to appropriately size content.

The .active class needs to be added to one of the slides otherwise the carousel will not be visible. Also be sure to set a unique id on the .carousel for controls, especially if you’re using multiple carousels on a single page. Control and indicator elements must have a data-bs-target attribute (or href for links) that matches the id of the .carousel element.

html

<div id="carouselExampleControls" class="carousel slide" data-bs-ride="carousel">
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleControls" data-bs-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Previous</span>
  </button>
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExampleControls" data-bs-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Next</span>
  </button>
</div>

With indicators

You can also add the indicators to the carousel.

Indicators are animated to show the active slide progress, based on its interval. It adapts to any interval you set thanks to the --o-carousel-interval CSS custom property. Carousel progress indicator is paused under multiple conditions:

when the prefers-reduced-motion media query equals reduce to improve accessibility.
when the carousel is paused—on hover by default, but can be changed using the data-bs-pause attribute: a .is-paused class is added to the carousel.
when the carousel doesn’t cycle and is stopped at one end: a .is-done class is added to the carousel.
when the carousel is static, ie. when it has .is-static class.

html

<div id="carouselExampleIndicators" class="carousel slide" data-bs-ride="true">
  <div class="carousel-indicators">
    <button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
    <button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="1" aria-label="Slide 2"></button>
    <button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="2" aria-label="Slide 3"></button>
  </div>
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Previous</span>
  </button>
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Next</span>
  </button>
</div>

With pause/play button

Adding a pause and play button is recommended to setup an accessible carousel. This button must immediately follow your carousel and have the custom data-bs-control="play-button" attribute. In addition, it must also have a data-bs-target attribute that matches the id of the .carousel element.

‘Play’ and ‘Pause’ texts can be changed by modifying data-bs-play-text and data-bs-pause-text custom attributes.

html

<div id="carouselExamplePause" class="carousel slide" data-bs-ride="carousel">
  <div class="carousel-indicators">
    <button type="button" data-bs-target="#carouselExamplePause" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
    <button type="button" data-bs-target="#carouselExamplePause" data-bs-slide-to="1" aria-label="Slide 2"></button>
    <button type="button" data-bs-target="#carouselExamplePause" data-bs-slide-to="2" aria-label="Slide 3"></button>
  </div>
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExamplePause" data-bs-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Previous</span>
  </button>
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExamplePause" data-bs-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Next</span>
  </button>
</div>
<button type="button" class="btn btn-icon btn-secondary carousel-control-play-pause pause mt-1" data-bs-target="#carouselExamplePause" data-bs-play-text="Play Carousel" data-bs-pause-text="Pause Carousel" title="Pause Carousel">
  <span class="visually-hidden">Pause Carousel</span>
</button>

With captions

Add captions to your slides easily with the .carousel-caption element within any .carousel-item. They can be easily hidden on smaller viewports, as shown below, with optional display utilities. We hide them initially with .d-none and bring them back on medium-sized devices with .d-md-block.

First slide label

Some representative placeholder content for the first slide.

Second slide label

Some representative placeholder content for the second slide.

Third slide label

Some representative placeholder content for the third slide.

html

<div id="carouselExampleCaptions" class="carousel slide" data-bs-ride="false">
  <div class="carousel-indicators">
    <button type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
    <button type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide-to="1" aria-label="Slide 2"></button>
    <button type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide-to="2" aria-label="Slide 3"></button>
  </div>
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="..." class="d-block w-100" alt="...">
      <div class="carousel-caption d-none d-md-block">
        <h5 class="mb-0">First slide label</h5>
        <p class="mb-0">Some representative placeholder content for the first slide.</p>
      </div>
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
      <div class="carousel-caption d-none d-md-block">
        <h5 class="mb-0">Second slide label</h5>
        <p class="mb-0">Some representative placeholder content for the second slide.</p>
      </div>
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
      <div class="carousel-caption d-none d-md-block">
        <h5 class="mb-0">Third slide label</h5>
        <p class="mb-0">Some representative placeholder content for the third slide.</p>
      </div>
    </div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Previous</span>
  </button>
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Next</span>
  </button>
</div>

Crossfade

Add .carousel-fade to your carousel to animate slides with a fade transition instead of a slide. Depending on your carousel content (e.g., text only slides), you may want to add .bg-body or some custom CSS to the .carousel-items for proper crossfading.

html

<div id="carouselExampleFade" class="carousel slide carousel-fade" data-bs-ride="carousel">
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleFade" data-bs-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Previous</span>
  </button>
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExampleFade" data-bs-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Next</span>
  </button>
</div>

Individual `.carousel-item` interval

Add data-bs-interval="" to a .carousel-item to change the amount of time to delay between automatically cycling to the next item.

html

<div id="carouselExampleInterval" class="carousel slide" data-bs-ride="carousel">
  <!-- Boosted mod -->
  <div class="carousel-indicators">
    <button type="button" data-bs-target="#carouselExampleInterval" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
    <button type="button" data-bs-target="#carouselExampleInterval" data-bs-slide-to="1" aria-label="Slide 2"></button>
    <button type="button" data-bs-target="#carouselExampleInterval" data-bs-slide-to="2" aria-label="Slide 3"></button>
  </div>
  <!-- End mod -->
  <div class="carousel-inner">
    <div class="carousel-item active" data-bs-interval="10000">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item" data-bs-interval="2000">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleInterval" data-bs-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Previous</span>
  </button>
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExampleInterval" data-bs-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Next</span>
  </button>
</div>

Disable touch swiping

Carousels support swiping left/right on touchscreen devices to move between slides. This can be disabled using the data-bs-touch attribute. The example below also does not include the data-bs-ride attribute so it doesn’t autoplay.

html

<div id="carouselExampleControlsNoTouching" class="carousel slide" data-bs-touch="false">
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleControlsNoTouching" data-bs-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Previous</span>
  </button>
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExampleControlsNoTouching" data-bs-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Next</span>
  </button>
</div>

Prevent cycling

Use data-bs-wrap="false" to prevent carousel from cycling continuously.

html

<div id="carouselExampleNoWrap" class="carousel slide" data-bs-wrap="false" data-bs-ride="carousel">
  <div class="carousel-indicators">
    <button type="button" data-bs-target="#carouselExampleNoWrap" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
    <button type="button" data-bs-target="#carouselExampleNoWrap" data-bs-slide-to="1" aria-label="Slide 2"></button>
    <button type="button" data-bs-target="#carouselExampleNoWrap" data-bs-slide-to="2" aria-label="Slide 3"></button>
  </div>
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleNoWrap" data-bs-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Previous</span>
  </button>
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExampleNoWrap" data-bs-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Next</span>
  </button>
</div>

Static carousel

To prevent the carousel from autoplaying, use the following attributes combo:

do not use data-bs-ride="carousel" attribute, to prevent instant initialization,
add .is-static class to your carousel, to cancel progress indicators animation.

html

<div id="carouselExampleNoRide" class="carousel slide is-static">
  <div class="carousel-indicators">
    <button type="button" data-bs-target="#carouselExampleNoRide" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
    <button type="button" data-bs-target="#carouselExampleNoRide" data-bs-slide-to="1" aria-label="Slide 2"></button>
    <button type="button" data-bs-target="#carouselExampleNoRide" data-bs-slide-to="2" aria-label="Slide 3"></button>
  </div>
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleNoRide" data-bs-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Previous</span>
  </button>
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExampleNoRide" data-bs-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Next</span>
  </button>
</div>

Custom transition

The transition duration of .carousel-item can be changed with the $carousel-transition-duration Sass variable before compiling or custom styles if you’re using the compiled CSS. If multiple transitions are applied, make sure the transform transition is defined first (e.g. transition: transform 2s ease, opacity .5s ease-out).

Sass

Variables

$carousel-control-color:             $black;
$carousel-control-width:             $spacer * 3;
$carousel-control-opacity:           null;
$carousel-control-hover-opacity:     null;
$carousel-control-transition:        $transition-focus;

$carousel-indicator-width:           .5rem;
$carousel-indicator-height:          .5rem;
$carousel-indicator-hit-area-height: $spacer * 1.5;
$carousel-indicator-spacer:          $spacer * .5;
$carousel-indicator-opacity:         null;
$carousel-indicator-active-bg:       $white;
$carousel-indicator-active-opacity:  null;
$carousel-indicator-transition:      null;
// Boosted mod
$carousel-indicator-hover-scale:        1.5;
$carousel-indicator-active-scale:       calc(2 / 3); // stylelint-disable-line function-disallowed-list
$carousel-indicator-active-radius:      0 100% 100% 0 / 50%;
$carousel-indicator-animation-duration: 5000ms;
$carousel-indicator-animation-interval: var(--carousel-interval, #{$carousel-indicator-animation-duration});
$carousel-indicators-padding-y:         $spacer * .5;
// End mod

$carousel-caption-width:             70%;
$carousel-caption-color:             $black;
$carousel-caption-padding-y:         $spacer;
$carousel-caption-padding-x:         $spacer; // Boosted mod
$carousel-caption-spacer:            $spacer * 3;

$carousel-control-icon-width:        2.5rem;
// Boosted mod
$carousel-control-icon-size:         2rem 2rem;
$carousel-control-icon-bg:           var(--#{$boosted-prefix}chevron-icon);
$carousel-control-icon-active-bg:    $component-active-bg;

$carousel-control-pause-icon:        $pause-icon;
$carousel-control-play-icon:         $play-icon;
$carousel-control-pause-icon-size:   1.5rem;
// End mod

$carousel-transition-duration:       .6s;
$carousel-transition:                transform $carousel-transition-duration $transition-timing; // Define transform transition first if using multiple transitions (e.g., `transform 2s ease, opacity .5s ease-out`)

Usage

Via data attributes

Use data attributes to easily control the position of the carousel. data-bs-slide accepts the keywords prev or next, which alters the slide position relative to its current position. Alternatively, use data-bs-slide-to to pass a raw slide index to the carousel data-bs-slide-to="2", which shifts the slide position to a particular index beginning with 0.

The data-bs-ride="carousel" attribute is used to mark a carousel as animating starting at page load. If you don’t use data-bs-ride="carousel" to initialize your carousel, you have to initialize it yourself. It cannot be used in combination with (redundant and unnecessary) explicit JavaScript initialization of the same carousel.

Via JavaScript

Call carousel manually with:

const carousel = new boosted.Carousel('#myCarousel')

Options

As options can be passed via data attributes or JavaScript, you can append an option name to data-bs-, as in data-bs-animation="{value}". Make sure to change the case type of the option name from “camelCase” to “kebab-case” when passing the options via data attributes. For example, use data-bs-custom-class="beautifier" instead of data-bs-customClass="beautifier".

All components support an experimental reserved data attribute data-bs-config that can house simple component configuration as a JSON string. When an element has data-bs-config='{"delay":0, "title":123}' and data-bs-title="456" attributes, the final title value will be 456 and the separate data attributes will override values given on data-bs-config. In addition, existing data attributes are able to house JSON values like data-bs-delay='{"show":0,"hide":150}'.

Name	Type	Default	Description
`interval`	number	`5000`	The amount of time to delay between automatically cycling an item.
`keyboard`	boolean	`true`	Whether the carousel should react to keyboard events.
`pause`	string, boolean	`"hover"`	If set to `"hover"`, pauses the cycling of the carousel on `mouseenter` and resumes the cycling of the carousel on `mouseleave`. If set to `false`, hovering over the carousel won’t pause it. On touch-enabled devices, when set to `"hover"`, cycling will pause on `touchend` (once the user finished interacting with the carousel) for two intervals, before automatically resuming. This is in addition to the mouse behavior.
`pause-text`	string	`"Pause Carousel"`	Text needed for accessibility attributes of the pause button. If empty or missing, the default text will be `"Pause Carousel"`.
`play-text`	string	`"Play Carousel"`	Text needed for accessibility attributes of the play button. If empty or missing, the default text will be `"Play Carousel"`.
`ride`	string, boolean	`false`	If set to `true`, autoplays the carousel after the user manually cycles the first item. If set to `"carousel"`, autoplays the carousel on load.
`touch`	boolean	`true`	Whether the carousel should support left/right swipe interactions on touchscreen devices.
`wrap`	boolean	`true`	Whether the carousel should cycle continuously or have hard stops.

Methods

Asynchronous methods and transitions

All API methods are asynchronous and start a transition. They return to the caller as soon as the transition is started but before it ends. In addition, a method call on a transitioning component will be ignored.

See our JavaScript documentation for more information.

You can create a carousel instance with the carousel constructor, for example, to initialize with additional options and start cycling through items:

const myCarouselElement = document.querySelector('#myCarousel')
const carousel = new boosted.Carousel(myCarouselElement, {
  interval: 2000,
  wrap: false
})

Method	Description
`cycle`	Cycles through the carousel items from left to right.
`dispose`	Destroys an element’s carousel. (Removes stored data on the DOM element)
`getInstance`	Static method which allows you to get the carousel instance associated to a DOM element, you can use it like this: `boosted.Carousel.getInstance(element)`.
`getOrCreateInstance`	Static method which returns a carousel instance associated to a DOM element or create a new one in case it wasn’t initialized. You can use it like this: `boosted.Carousel.getOrCreateInstance(element)`.
`next`	Cycles to the next item. Returns to the caller before the next item has been shown (e.g., before the `slid.bs.carousel` event occurs).
`nextWhenVisible`	Don’t cycle carousel to next when the page isn’t visible or the carousel or its parent isn’t visible. Returns to the caller before the target item has been shown.
`pause`	Stops the carousel from cycling through items.
`prev`	Cycles to the previous item. Returns to the caller before the previous item has been shown (e.g., before the `slid.bs.carousel` event occurs).
`to`	Cycles the carousel to a particular frame (0 based, similar to an array). Returns to the caller before the target item has been shown (e.g., before the `slid.bs.carousel` event occurs).

Events

Boosted Innovation Cup’s carousel class exposes two events for hooking into carousel functionality. Both events have the following additional properties:

direction: The direction in which the carousel is sliding (either "left" or "right").
relatedTarget: The DOM element that is being slid into place as the active item.
from: The index of the current item
to: The index of the next item

All carousel events are fired at the carousel itself (i.e. at the <div class="carousel">).

Event type	Description
`slid.bs.carousel`	Fired when the carousel has completed its slide transition.
`slide.bs.carousel`	Fires immediately when the `slide` instance method is invoked.

const myCarousel = document.getElementById('myCarousel')

myCarousel.addEventListener('slide.bs.carousel', event => {
  // do something...
})

Carousel

How it works

Example

With indicators

With pause/play button

With captions

First slide label

Second slide label

Third slide label

Crossfade

Individual .carousel-item interval

Disable touch swiping

Prevent cycling

Static carousel

Custom transition

Sass

Variables

Usage

Via data attributes

Via JavaScript

Options

Methods

Asynchronous methods and transitions

Events

Individual `.carousel-item` interval