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386 lines
20 KiB
Markdown
386 lines
20 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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{{< callout info >}}
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{{< partial "callouts/info-prefersreducedmotion.md" >}}
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{{< /callout >}}
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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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## 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-bs-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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{{< example >}}
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<div id="carouselExampleSlidesOnly" class="carousel slide" data-bs-ride="carousel">
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<div class="carousel-inner">
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<div class="carousel-item active">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}}
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}}
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="Third slide" >}}
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</div>
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</div>
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</div>
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{{< /example >}}
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### With controls
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Adding in the previous and next controls. We recommend using `<button>` elements, but you can also use `<a>` elements with `role="button"`.
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{{< example >}}
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<div id="carouselExampleControls" class="carousel slide" data-bs-ride="carousel">
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<div class="carousel-inner">
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<div class="carousel-item active">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}}
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}}
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="Third slide" >}}
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</div>
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</div>
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<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleControls" data-bs-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Previous</span>
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</button>
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<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleControls" data-bs-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Next</span>
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</button>
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</div>
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{{< /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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{{< example >}}
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<div id="carouselExampleIndicators" class="carousel slide" data-bs-ride="true">
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<div class="carousel-indicators">
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<button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
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<button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="1" aria-label="Slide 2"></button>
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<button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="2" aria-label="Slide 3"></button>
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</div>
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<div class="carousel-inner">
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<div class="carousel-item active">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}}
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}}
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="Third slide" >}}
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</div>
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</div>
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<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Previous</span>
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</button>
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<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Next</span>
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</button>
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</div>
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{{< /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]({{< docsref "/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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{{< example >}}
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<div id="carouselExampleCaptions" class="carousel slide" data-bs-ride="false">
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<div class="carousel-indicators">
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<button type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
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<button type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide-to="1" aria-label="Slide 2"></button>
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<button type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide-to="2" aria-label="Slide 3"></button>
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</div>
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<div class="carousel-inner">
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<div class="carousel-item active">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="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>Some representative placeholder content for the first slide.</p>
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</div>
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="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>Some representative placeholder content for the second slide.</p>
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</div>
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="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>Some representative placeholder content for the third slide.</p>
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</div>
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</div>
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</div>
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<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Previous</span>
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</button>
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<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Next</span>
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</button>
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</div>
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{{< /example >}}
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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. Depending on your carousel content (e.g., text only slides), you may want to add `.bg-body` or some custom CSS to the `.carousel-item`s for proper crossfading.
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{{< example >}}
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<div id="carouselExampleFade" class="carousel slide carousel-fade" data-bs-ride="carousel">
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<div class="carousel-inner">
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<div class="carousel-item active">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}}
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}}
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="Third slide" >}}
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</div>
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</div>
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<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleFade" data-bs-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Previous</span>
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</button>
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<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleFade" data-bs-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Next</span>
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</button>
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</div>
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{{< /example >}}
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### Individual `.carousel-item` interval
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Add `data-bs-interval=""` to a `.carousel-item` to change the amount of time to delay between automatically cycling to the next item.
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{{< example >}}
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<div id="carouselExampleInterval" class="carousel slide" data-bs-ride="carousel">
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<div class="carousel-inner">
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<div class="carousel-item active" data-bs-interval="10000">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}}
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</div>
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<div class="carousel-item" data-bs-interval="2000">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}}
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="Third slide" >}}
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</div>
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</div>
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<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleInterval" data-bs-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Previous</span>
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</button>
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<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleInterval" data-bs-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Next</span>
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</button>
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</div>
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{{< /example >}}
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### Disable touch swiping
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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.
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{{< example >}}
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<div id="carouselExampleControlsNoTouching" class="carousel slide" data-bs-touch="false">
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<div class="carousel-inner">
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<div class="carousel-item active">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}}
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}}
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="Third slide" >}}
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</div>
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</div>
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<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleControlsNoTouching" data-bs-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Previous</span>
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</button>
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<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleControlsNoTouching" data-bs-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Next</span>
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</button>
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</div>
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{{< /example >}}
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## Dark variant
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Add `.carousel-dark` to the `.carousel` for darker controls, indicators, and captions. Controls have been inverted from their default white fill with the `filter` CSS property. Captions and controls have additional Sass variables that customize the `color` and `background-color`.
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{{< example >}}
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<div id="carouselExampleDark" class="carousel carousel-dark slide" data-bs-ride="carousel">
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<div class="carousel-indicators">
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<button type="button" data-bs-target="#carouselExampleDark" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
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<button type="button" data-bs-target="#carouselExampleDark" data-bs-slide-to="1" aria-label="Slide 2"></button>
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<button type="button" data-bs-target="#carouselExampleDark" data-bs-slide-to="2" aria-label="Slide 3"></button>
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</div>
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<div class="carousel-inner">
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<div class="carousel-item active" data-bs-interval="10000">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#aaa" background="#f5f5f5" text="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>Some representative placeholder content for the first slide.</p>
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</div>
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</div>
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<div class="carousel-item" data-bs-interval="2000">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#bbb" background="#eee" text="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>Some representative placeholder content for the second slide.</p>
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</div>
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</div>
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<div class="carousel-item">
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{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#999" background="#e5e5e5" text="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>Some representative placeholder content for the third slide.</p>
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</div>
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</div>
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</div>
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<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleDark" data-bs-slide="prev">
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<span class="carousel-control-prev-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Previous</span>
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</button>
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<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleDark" data-bs-slide="next">
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<span class="carousel-control-next-icon" aria-hidden="true"></span>
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<span class="visually-hidden">Next</span>
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</button>
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</div>
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{{< /example >}}
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## Custom transition
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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`).
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## Sass
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### Variables
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Variables for all carousels:
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{{< scss-docs name="carousel-variables" file="scss/_variables.scss" >}}
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Variables for the [dark carousel](#dark-variant):
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{{< scss-docs name="carousel-dark-variables" file="scss/_variables.scss" >}}
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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-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`.
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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.**
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### Via JavaScript
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Call carousel manually with:
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```js
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const carousel = new bootstrap.Carousel('#myCarousel')
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```
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### Options
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{{< markdown >}}
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{{< partial "js-data-attributes.md" >}}
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{{< /markdown >}}
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{{< bs-table >}}
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| Name | Type | Default | Description |
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| --- | --- | --- | --- |
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| `interval` | number | `5000` | The amount of time to delay between automatically cycling an item. |
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| `keyboard` | boolean | `true` | Whether the carousel should react to keyboard events. |
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| `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. |
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| `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. |
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| `touch` | boolean | `true` | Whether the carousel should support left/right swipe interactions on touchscreen devices. |
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| `wrap` | boolean | `true` | Whether the carousel should cycle continuously or have hard stops. |
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{{< /bs-table >}}
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### Methods
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{{< callout danger >}}
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{{< partial "callouts/danger-async-methods.md" >}}
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{{< /callout >}}
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You can create a carousel instance with the carousel constructor, for example, to initialize with additional options and start cycling through items:
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```js
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const myCarouselElement = document.querySelector('#myCarousel')
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const carousel = new bootstrap.Carousel(myCarouselElement, {
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interval: 2000,
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wrap: false
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})
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```
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{{< bs-table >}}
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| Method | Description |
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| --- | --- |
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| `cycle` | Cycles through the carousel items from left to right. |
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| `dispose` | Destroys an element's carousel. (Removes stored data on the DOM element) |
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| `getInstance` | Static method which allows you to get the carousel instance associated to a DOM element, you can use it like this: `bootstrap.Carousel.getInstance(element)`. |
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| `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: `bootstrap.Carousel.getOrCreateInstance(element)`. |
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| `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). |
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| `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**. |
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| `pause` | Stops the carousel from cycling through items. |
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| `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). |
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| `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). |
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{{< /bs-table >}}
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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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{{< bs-table >}}
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| Event type | Description |
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| --- | --- |
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| `slid.bs.carousel` | Fired when the carousel has completed its slide transition. |
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| `slide.bs.carousel` | Fires immediately when the `slide` instance method is invoked. |
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{{< /bs-table >}}
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```js
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const myCarousel = document.getElementById('myCarousel')
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myCarousel.addEventListener('slide.bs.carousel', event => {
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// do something...
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})
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```
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