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diff --git a/site/content/docs/4.3/components/carousel.md b/site/content/docs/4.3/components/carousel.md new file mode 100644 index 0000000000..e17db95166 --- /dev/null +++ b/site/content/docs/4.3/components/carousel.md @@ -0,0 +1,350 @@ +--- +layout: docs +title: Carousel +description: A slideshow component for cycling through elements—images or slides of text—like a carousel. +group: components +toc: true +--- + +## 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](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.). + +{{< callout info >}} +{{< partial "callout-info-prefersreducedmotion.md" >}} +{{< /callout >}} + +Please be aware that nested carousels are not supported, and carousels are generally not compliant with accessibility standards. + +Lastly, if you're building our JavaScript from source, it [requires `util.js`](/docs/{{< param docs_version >}}/getting-started/javascript/#util). + +## Example + +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. + +**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. + +### Slides only + +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. + +{{< example >}} +<div id="carouselExampleSlidesOnly" class="carousel slide" data-ride="carousel"> + <div class="carousel-inner"> + <div class="carousel-item active"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}} + </div> + <div class="carousel-item"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}} + </div> + <div class="carousel-item"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="Third slide" >}} + </div> + </div> +</div> +{{< /example >}} + +### With controls + +Adding in the previous and next controls: + +{{< example >}} +<div id="carouselExampleControls" class="carousel slide" data-ride="carousel"> + <div class="carousel-inner"> + <div class="carousel-item active"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}} + </div> + <div class="carousel-item"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}} + </div> + <div class="carousel-item"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="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> +{{< /example >}} + +### With indicators + +You can also add the indicators to the carousel, alongside the controls, too. + +{{< example >}} +<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"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}} + </div> + <div class="carousel-item"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}} + </div> + <div class="carousel-item"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="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> +{{< /example >}} + +### 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](/docs/{{< param docs_version >}}/utilities/display/). We hide them initially with `.d-none` and bring them back on medium-sized devices with `.d-md-block`. + +{{< example >}} +<div class="bd-example"> + <div id="carouselExampleCaptions" class="carousel slide" data-ride="carousel"> + <ol class="carousel-indicators"> + <li data-target="#carouselExampleCaptions" data-slide-to="0" class="active"></li> + <li data-target="#carouselExampleCaptions" data-slide-to="1"></li> + <li data-target="#carouselExampleCaptions" data-slide-to="2"></li> + </ol> + <div class="carousel-inner"> + <div class="carousel-item active"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}} + <div class="carousel-caption d-none d-md-block"> + <h5>First slide label</h5> + <p>Nulla vitae elit libero, a pharetra augue mollis interdum.</p> + </div> + </div> + <div class="carousel-item"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}} + <div class="carousel-caption d-none d-md-block"> + <h5>Second slide label</h5> + <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p> + </div> + </div> + <div class="carousel-item"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="Third slide" >}} + <div class="carousel-caption d-none d-md-block"> + <h5>Third slide label</h5> + <p>Praesent commodo cursus magna, vel scelerisque nisl consectetur.</p> + </div> + </div> + </div> + <a class="carousel-control-prev" href="#carouselExampleCaptions" 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="#carouselExampleCaptions" role="button" data-slide="next"> + <span class="carousel-control-next-icon" aria-hidden="true"></span> + <span class="sr-only">Next</span> + </a> + </div> +</div> +{{< /example >}} + +### Crossfade + +Add `.carousel-fade` to your carousel to animate slides with a fade transition instead of a slide. + +{{< example >}} +<div id="carouselExampleFade" class="carousel slide carousel-fade" data-ride="carousel"> + <div class="carousel-inner"> + <div class="carousel-item active"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}} + </div> + <div class="carousel-item"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}} + </div> + <div class="carousel-item"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="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> +{{< /example >}} + +### Individual `.carousel-item` interval + +Add `data-interval=""` to a `.carousel-item` to change the amount of time to delay between automatically cycling to the next item. + +{{< example >}} +<div id="carouselExampleInterval" class="carousel slide" data-ride="carousel"> + <div class="carousel-inner"> + <div class="carousel-item active" data-interval="10000"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#555" background="#777" text="First slide" >}} + </div> + <div class="carousel-item" data-interval="2000"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#444" background="#666" text="Second slide" >}} + </div> + <div class="carousel-item"> + {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="Third slide" >}} + </div> + </div> + <a class="carousel-control-prev" href="#carouselExampleInterval" 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="#carouselExampleInterval" role="button" data-slide="next"> + <span class="carousel-control-next-icon" aria-hidden="true"></span> + <span class="sr-only">Next</span> + </a> +</div> +{{< /example >}} + + +## Usage + +### Via data attributes + +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`. + +The `data-ride="carousel"` attribute is used to mark a carousel as animating starting at page load. If you don't use `data-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: + +{{< highlight js >}} +var myCarousel = document.querySelector('#myCarousel') +var carousel = new bootstrap.Carousel(myCarousel) +{{< /highlight >}} + +### Options + +Options can be passed via data attributes or JavaScript. For data attributes, append the option name to `data-`, as in `data-interval=""`. + +<table class="table table-bordered table-striped"> + <thead> + <tr> + <th style="width: 100px;">Name</th> + <th style="width: 50px;">Type</th> + <th style="width: 50px;">Default</th> + <th>Description</th> + </tr> + </thead> + <tbody> + <tr> + <td>interval</td> + <td>number</td> + <td>5000</td> + <td>The amount of time to delay between automatically cycling an item. If false, carousel will not automatically cycle.</td> + </tr> + <tr> + <td>keyboard</td> + <td>boolean</td> + <td>true</td> + <td>Whether the carousel should react to keyboard events.</td> + </tr> + <tr> + <td>pause</td> + <td>string | boolean</td> + <td>"hover"</td> + <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> + <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> + </tr> + <tr> + <td>slide</td> + <td>string | boolean</td> + <td>false</td> + <td>Autoplays the carousel after the user manually cycles the first item. If "carousel", autoplays the carousel on load.</td> + </tr> + <tr> + <td>wrap</td> + <td>boolean</td> + <td>true</td> + <td>Whether the carousel should cycle continuously or have hard stops.</td> + </tr> + <tr> + <td>touch</td> + <td>boolean</td> + <td>true</td> + <td>Whether the carousel should support left/right swipe interactions on touchscreen devices.</td> + </tr> + </tbody> +</table> + +### Methods + +{{< callout danger >}} +{{< partial "callout-danger-async-methods.md" >}} +{{< /callout >}} + +You can create a carousel instance with the carousel constructor, for example, to initialize with additional options and start cycling through items: + +{{< highlight js >}} +var myCarousel = document.querySelector('#myCarousel') +var carousel = new bootstrap.Carousel(myCarousel, { + interval: 2000, + wrap: false +}) +{{< /highlight >}} + + +| Method | Description | +| --- | --- | +| `cycle` | Cycles through the carousel items from left to right. | +| `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** (i.e. before the `slid.bs.carousel` event occurs). | +| `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). | +| `nextWhenVisible` | Only go to the next slide when the page, carousel and the carousel parent is visible. | +| `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** (i.e. before the `slid.bs.carousel` event occurs). | +| `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">`). + +<table class="table table-bordered table-striped"> + <thead> + <tr> + <th style="width: 150px;">Event Type</th> + <th>Description</th> + </tr> + </thead> + <tbody> + <tr> + <td>slide.bs.carousel</td> + <td>This event fires immediately when the <code>slide</code> instance method is invoked.</td> + </tr> + <tr> + <td>slid.bs.carousel</td> + <td>This event is fired when the carousel has completed its slide transition.</td> + </tr> + </tbody> +</table> + +{{< highlight js >}} +$('#myCarousel').on('slide.bs.carousel', function () { + // do something... +}) +{{< /highlight >}} + +### Change transition duration + +The transition duration of `.carousel-item` can be changed with the `$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 (eg. `transition: transform 2s ease, opacity .5s ease-out`). |