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372 lines
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Markdown
372 lines
16 KiB
Markdown
---
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layout: docs
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title: Carousel
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description: A slideshow component for cycling through elements—images or slides of text—like a carousel.
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group: components
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toc: true
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---
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## How it works
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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.
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In browsers where the [Page Visibility API](https://www.w3.org/TR/page-visibility/) 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.).
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The carousel supports swipe gestures (left and right) using [HammerJS]({{ site.cdn.hammer }}). For this to function correctly you need to include HammerJS before Bootstrap or use `bootstrap.bundle.min.js` / `bootstrap.bundle.js` which contains HammerJS.
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Please be aware that nested carousels are not supported, and carousels are generally not compliant with accessibility standards.
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Lastly, if you're building our JavaScript from source, it [requires `util.js`]({{ site.baseurl }}/docs/{{ site.docs_version }}/getting-started/javascript/#util).
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## Example
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Carousels don't automatically normalize slide dimensions. As such, you may need to use additional utilities or custom styles to appropriately size content. While carousels support previous/next controls and indicators, they're not explicitly required. Add and customize as you see fit.
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**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 optional controls, especially if you're using multiple carousels on a single page. Control and indicator elements must have a `data-target` attribute (or `href` for links) that matches the id of the `.carousel` element.
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### Slides only
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Here's a carousel with slides only. Note the presence of the `.d-block` and `.w-100` on carousel images to prevent browser default image alignment.
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{% capture example %}
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<div id="carouselExampleSlidesOnly" class="carousel slide" data-ride="carousel">
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<div class="carousel-inner">
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<div class="carousel-item active">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
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</div>
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<div class="carousel-item">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
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</div>
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<div class="carousel-item">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
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</div>
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</div>
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</div>
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{% endcapture %}
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{% include example.html content=example %}
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### With controls
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Adding in the previous and next controls:
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{% capture example %}
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<div id="carouselExampleControls" class="carousel slide" data-ride="carousel">
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<div class="carousel-inner">
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<div class="carousel-item active">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
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</div>
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<div class="carousel-item">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
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</div>
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<div class="carousel-item">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
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</div>
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</div>
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<a class="carousel-control-prev" href="#carouselExampleControls" role="button" data-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="sr-only">Previous</span>
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</a>
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<a class="carousel-control-next" href="#carouselExampleControls" role="button" data-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="sr-only">Next</span>
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</a>
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</div>
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{% endcapture %}
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{% include example.html content=example %}
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### With indicators
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You can also add the indicators to the carousel, alongside the controls, too.
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{% capture example %}
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<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
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<ol class="carousel-indicators">
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<li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
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<li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
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<li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
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</ol>
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<div class="carousel-inner">
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<div class="carousel-item active">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
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</div>
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<div class="carousel-item">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
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</div>
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<div class="carousel-item">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
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</div>
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</div>
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<a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="sr-only">Previous</span>
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</a>
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<a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="sr-only">Next</span>
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</a>
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</div>
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{% endcapture %}
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{% include example.html content=example %}
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### With captions
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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]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/display/). We hide them initially with `.d-none` and bring them back on medium-sized devices with `.d-md-block`.
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<div class="bd-example">
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<div id="carouselExampleCaptions" class="carousel slide" data-ride="carousel">
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<ol class="carousel-indicators">
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<li data-target="#carouselExampleCaptions" data-slide-to="0" class="active"></li>
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<li data-target="#carouselExampleCaptions" data-slide-to="1"></li>
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<li data-target="#carouselExampleCaptions" data-slide-to="2"></li>
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</ol>
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<div class="carousel-inner">
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<div class="carousel-item active">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
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<div class="carousel-caption d-none d-md-block">
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<h5>First slide label</h5>
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<p>Nulla vitae elit libero, a pharetra augue mollis interdum.</p>
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</div>
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</div>
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<div class="carousel-item">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
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<div class="carousel-caption d-none d-md-block">
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<h5>Second slide label</h5>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
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</div>
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</div>
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<div class="carousel-item">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
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<div class="carousel-caption d-none d-md-block">
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<h5>Third slide label</h5>
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<p>Praesent commodo cursus magna, vel scelerisque nisl consectetur.</p>
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</div>
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</div>
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</div>
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<a class="carousel-control-prev" href="#carouselExampleCaptions" role="button" data-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="sr-only">Previous</span>
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</a>
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<a class="carousel-control-next" href="#carouselExampleCaptions" role="button" data-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="sr-only">Next</span>
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</a>
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</div>
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</div>
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{% highlight html %}
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<div class="carousel-item">
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<img src="..." alt="...">
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<div class="carousel-caption d-none d-md-block">
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<h5>...</h5>
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<p>...</p>
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</div>
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</div>
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{% endhighlight %}
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### Crossfade
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Add `.carousel-fade` to your carousel to animate slides with a fade transition instead of a slide.
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{% capture example %}
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<div id="carouselExampleFade" class="carousel slide carousel-fade" data-ride="carousel">
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<div class="carousel-inner">
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<div class="carousel-item active">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
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</div>
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<div class="carousel-item">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
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</div>
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<div class="carousel-item">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
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</div>
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</div>
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<a class="carousel-control-prev" href="#carouselExampleFade" role="button" data-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="sr-only">Previous</span>
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</a>
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<a class="carousel-control-next" href="#carouselExampleFade" role="button" data-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="sr-only">Next</span>
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</a>
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</div>
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{% endcapture %}
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{% include example.html content=example %}
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### Individual `.carousel-item` interval
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Add `data-interval=""` to a `.carousel-item` to change the amount of time to delay between automatically cycling to the next item.
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{% capture example %}
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<div id="carouselExampleInterval" class="carousel slide" data-ride="carousel">
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<div class="carousel-inner">
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<div class="carousel-item active" data-interval="10000">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
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</div>
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<div class="carousel-item" data-interval="20000">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
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</div>
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<div class="carousel-item">
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<img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
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</div>
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</div>
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<a class="carousel-control-prev" href="#carouselExampleInterval" role="button" data-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="sr-only">Previous</span>
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</a>
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<a class="carousel-control-next" href="#carouselExampleInterval" role="button" data-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="sr-only">Next</span>
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</a>
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</div>
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{% endcapture %}
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{% include example.html content=example %}
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## Usage
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### Via data attributes
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Use data attributes to easily control the position of the carousel. `data-slide` accepts the keywords `prev` or `next`, which alters the slide position relative to its current position. Alternatively, use `data-slide-to` to pass a raw slide index to the carousel `data-slide-to="2"`, which shifts the slide position to a particular index beginning with `0`.
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The `data-ride="carousel"` attribute is used to mark a carousel as animating starting at page load. **It cannot be used in combination with (redundant and unnecessary) explicit JavaScript initialization of the same carousel.**
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### Via JavaScript
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Call carousel manually with:
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{% highlight js %}
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$('.carousel').carousel()
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{% endhighlight %}
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### Options
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Options can be passed via data attributes or JavaScript. For data attributes, append the option name to `data-`, as in `data-interval=""`.
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<table class="table table-bordered table-striped">
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<thead>
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<tr>
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<th style="width: 100px;">Name</th>
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<th style="width: 50px;">Type</th>
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<th style="width: 50px;">Default</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>interval</td>
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<td>number</td>
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<td>5000</td>
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<td>The amount of time to delay between automatically cycling an item. If false, carousel will not automatically cycle.</td>
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</tr>
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<tr>
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<td>keyboard</td>
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<td>boolean</td>
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<td>true</td>
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<td>Whether the carousel should react to keyboard events.</td>
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</tr>
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<tr>
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<td>pause</td>
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<td>string | boolean</td>
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<td>"hover"</td>
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<td><p>If set to <code>"hover"</code>, pauses the cycling of the carousel on <code>mouseenter</code> and resumes the cycling of the carousel on <code>mouseleave</code>. If set to <code>false</code>, hovering over the carousel won't pause it.</p>
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<p>On touch-enabled devices, when set to <code>"hover"</code>, cycling will pause on <code>touchend</code> (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.</p></td>
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</tr>
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<tr>
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<td>ride</td>
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<td>string</td>
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<td>false</td>
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<td>Autoplays the carousel after the user manually cycles the first item. If "carousel", autoplays the carousel on load.</td>
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</tr>
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<tr>
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<td>wrap</td>
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<td>boolean</td>
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<td>true</td>
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<td>Whether the carousel should cycle continuously or have hard stops.</td>
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</tr>
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<tr>
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<td>touch</td>
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<td>boolean</td>
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<td>true</td>
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<td>Whether the carousel should handle touch event and allow swipe left/right.</td>
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</tr>
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</tbody>
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</table>
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### Methods
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{% include callout-danger-async-methods.md %}
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#### `.carousel(options)`
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Initializes the carousel with an optional options `object` and starts cycling through items.
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{% highlight js %}
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$('.carousel').carousel({
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interval: 2000
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})
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{% endhighlight %}
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#### `.carousel('cycle')`
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Cycles through the carousel items from left to right.
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#### `.carousel('pause')`
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Stops the carousel from cycling through items.
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#### `.carousel(number)`
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Cycles the carousel to a particular frame (0 based, similar to an array). **Returns to the caller before the target item has been shown** (i.e. before the `slid.bs.carousel` event occurs).
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#### `.carousel('prev')`
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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).
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#### `.carousel('next')`
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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).
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#### `.carousel('dispose')`
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Destroys an element's carousel.
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### Events
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Bootstrap's carousel class exposes two events for hooking into carousel functionality. Both events have the following additional properties:
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- `direction`: The direction in which the carousel is sliding (either `"left"` or `"right"`).
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- `relatedTarget`: The DOM element that is being slid into place as the active item.
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- `from`: The index of the current item
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- `to`: The index of the next item
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All carousel events are fired at the carousel itself (i.e. at the `<div class="carousel">`).
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<table class="table table-bordered table-striped">
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<thead>
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<tr>
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<th style="width: 150px;">Event Type</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>slide.bs.carousel</td>
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<td>This event fires immediately when the <code>slide</code> instance method is invoked.</td>
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</tr>
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<tr>
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<td>slid.bs.carousel</td>
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<td>This event is fired when the carousel has completed its slide transition.</td>
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</tr>
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</tbody>
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</table>
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{% highlight js %}
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$('#myCarousel').on('slide.bs.carousel', function () {
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// do something…
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})
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{% endhighlight %}
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### Change transition duration
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The transition duration of `.carousel-item` can be changed with the `$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 (eg. `transition: transform 2s ease, opacity .5s ease-out`).
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