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Bootstrap carousel

Bootstrap carousel is a slideshow component for cycling through HTML elements.

How it works

The bootstrap carousel is a slideshow for cycling within a group of content, built with CSS 3D transforms and JavaScript. It runs with a group of images, text, or html elements. It also incorporates support for previous/next buttons.

Please be informed that nested carousels are not supported, and carousels are frequently not compliant with accessibility rules.

Lastly, if you’re building our JavaScript from source, it requires util.js.

Example

Carousels don’t automatically normalize slide dimensions. As such, you may want to use extra utilities or custom methods to properly size content. While carousels support previous/next controls and indicators, they’re not explicitly expected. Add and customize as you see fit.

The .active class must be attached to one of the slides otherwise, the carousel will not be shown. Additionally be sure to set a different id on the .carousel for optional controls, particularly if you’re using many carousels on a page.

Slides only

Here’s a carousel with slides. Note the appearance of the .d-block also, .w-100 on carousel images to override browser default image alignment.

<div id="carouselExampleSlidesOnly" class="carousel slide" data-ride="carousel">
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img class="d-block w-100" src="..." alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Second slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Third slide">
    </div>
  </div>
</div>

With controls

Attaching the previous and next control buttons:

<div id="carouselExampleControls" class="carousel slide" data-ride="carousel">
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img class="d-block w-100" src="..." alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Second slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Third slide">
    </div>
  </div>
  <a class="carousel-control-prev" href="#carouselExampleControls" role="button" data-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="carousel-control-next" href="#carouselExampleControls" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>

With indicators

You can attach the indicators to the carousel, lengthwise the controls, too.

<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
  <ol class="carousel-indicators">
    <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
  </ol>
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img class="d-block w-100" src="..." alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Second slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Third slide">
    </div>
  </div>
  <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>

With captions

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

<div class="carousel-item">
  <img src="..." alt="...">
  <div class="carousel-caption d-none d-md-block">
    <h5>...</h5>
    <p>...</p>
  </div>
</div>

Crossfade

Add .carousel-fade to your carousel to animate slides with a fade transition instead of a slide.

<div id="carouselExampleFade" class="carousel slide carousel-fade" data-ride="carousel">
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img class="d-block w-100" src="..." alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Second slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Third slide">
    </div>
  </div>
  <a class="carousel-control-prev" href="#carouselExampleFade" role="button" data-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="carousel-control-next" href="#carouselExampleFade" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>

Usage

Via data attributes

Utilize data attributes to control the position of the carousel. data-slide allows the keywords prev or next, which changes the slide position corresponding to its current position. Alternatively, use data-slide-to to pass a raw slide index to the carousel data-slide-to="2", which moves the slide position to a particular index beginning with 0.

The data-ride="carousel" attribute is applied to mark a carousel as animating starting at page load. It cannot be done in combination with (redundant and unnecessary) explicit JavaScript initialization of the same carousel.

Via JavaScript

Call carousel manually with:

$('.carousel').carousel()

Options

Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-, as in data-interval="".

Name Type Default Description
interval number 5000 The amount of time to delay between automatically cycling an item. If false, carousel will not automatically cycle.
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. Note that this is in addition to the above mouse behavior.

ride string false Autoplays the carousel after the user manually cycles the first item. If "carousel", autoplays the carousel on load.
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.

.carousel(options)

Initializes the carousel with an optional options object and starts cycling through items.

$('.carousel').carousel({
  interval: 2000
})

.carousel('cycle')

Cycles through the carousel items from left to right.

.carousel('pause')

Stops the carousel from cycling through items.

.carousel(number)

Cycles the carousel to a selective frame. Returns to the caller before the target item has been shown (i.e. before the slid.bs.carousel event occurs).

.carousel('prev')

Cycles to the previous item. Returns to the caller before the previous item has been shown (i.e. before the slid.bs.carousel event occurs).

.carousel('next')

Cycles to the next item. Returns to the caller before the next item has been shown (i.e. before the slid.bs.carousel event occurs).

.carousel('dispose')

Destroys an element’s carousel.

Events

Bootstrap’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
slide.bs.carousel This event fires immediately when the slide instance method is invoked.
slid.bs.carousel This event is fired when the carousel has completed its slide transition.
$('#myCarousel').on('slide.bs.carousel', function () {
  // do something…
})

Change transition duration

The transition duration of .carousel-item can be changed with the $carousel-transition 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). The transition duration must be the same for each carousel item.