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Rewrite/reorganise carousel docs page
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* start with static/non-autoplaying examples
* explicitly mention that carousels currently need to be manually initialized
* split out and explain autoplaying and the weird "autoplay after first interaction" behaviour, as well as the pause on hover/focus
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@patrickhlauke
patrickhlauke committed Oct 22, 2022
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Expand Up @@ -18,38 +18,22 @@ In browsers where the [Page Visibility API](https://www.w3.org/TR/page-visibilit

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

## Example

Carousels don't automatically normalize slide dimensions. As such, you may need to use additional utilities or custom styles to appropriately size content. 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-bs-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.
{{< callout warning >}}
For performance reasons, carousels must be manually initialized using the [carousel constructor method](#methods). Without initialization, some of the event listeners (specifically, the events needed touch/swipe support) will not be registered until a user has explicitly activated the previous/next controls, if present.

{{< example >}}
<div id="carouselExampleSlidesOnly" class="carousel slide" data-bs-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 >}}
The only exception are [autoplaying carousels](#autoplaying-carousel) using the `data-bs-ride="carousel"` attribute – these are initialized automatically on the page load.
{{< /callout >}}

### With controls
## Basic examples

Adding in the previous and next controls. We recommend using `<button>` elements, but you can also use `<a>` elements with `role="button"`.
Here is a basic example of a carousel with three slides. Note the previous/next controls. We recommend using `<button>` elements, but you can also use `<a>` elements with `role="button"`.

{{< example >}}
<div id="carouselExampleControls" class="carousel slide" data-bs-ride="carousel">
<div id="carouselExample" class="carousel slide">
<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" >}}
Expand All @@ -61,23 +45,23 @@ Adding in the previous and next controls. We recommend using `<button>` elements
{{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100" color="#333" background="#555" text="Third slide" >}}
</div>
</div>
<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleControls" data-bs-slide="prev">
<button class="carousel-control-prev" type="button" data-bs-target="#carouselExample" data-bs-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="visually-hidden">Previous</span>
</button>
<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleControls" data-bs-slide="next">
<button class="carousel-control-next" type="button" data-bs-target="#carouselExample" data-bs-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="visually-hidden">Next</span>
</button>
</div>
{{< /example >}}

### With indicators
### Indicators

You can also add the indicators to the carousel, alongside the controls, too.
You can add indicators to the carousel, alongside the previous/next controls. The indicators let users jump directly to a particular slide.

{{< example >}}
<div id="carouselExampleIndicators" class="carousel slide" data-bs-ride="true">
<div id="carouselExampleIndicators" class="carousel slide">
<div class="carousel-indicators">
<button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
<button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="1" aria-label="Slide 2"></button>
Expand Down Expand Up @@ -105,12 +89,12 @@ You can also add the indicators to the carousel, alongside the controls, too.
</div>
{{< /example >}}

### With captions
### 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]({{< docsref "/utilities/display" >}}). We hide them initially with `.d-none` and bring them back on medium-sized devices with `.d-md-block`.
You can add captions to your slides 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`.

{{< example >}}
<div id="carouselExampleCaptions" class="carousel slide" data-bs-ride="false">
<div id="carouselExampleCaptions" class="carousel slide">
<div class="carousel-indicators">
<button type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
<button type="button" data-bs-target="#carouselExampleCaptions" data-bs-slide-to="1" aria-label="Slide 2"></button>
Expand Down Expand Up @@ -155,7 +139,7 @@ Add captions to your slides easily with the `.carousel-caption` element within a
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.

{{< example >}}
<div id="carouselExampleFade" class="carousel slide carousel-fade" data-bs-ride="carousel">
<div id="carouselExampleFade" class="carousel slide carousel-fade">
<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" >}}
Expand All @@ -178,6 +162,62 @@ Add `.carousel-fade` to your carousel to animate slides with a fade transition i
</div>
{{< /example >}}

## Autoplaying carousel

You can make your carousels autoplay on page load by adding the `data-bs-ride="carousel"` attribute.

Autoplaying carousels automatically pause while hovered with the mouse, and while keyboard focus is inside them.

{{< example >}}
<div id="carouselExampleAutoplaying" class="carousel slide" data-bs-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>
<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleAutoplaying" data-bs-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="visually-hidden">Previous</span>
</button>
<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleAutoplaying" data-bs-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="visually-hidden">Next</span>
</button>
</div>
{{< /example >}}

Using `data-bs-ride="true"`, carousels won't automatically start to autoplay on page load. Instead, they will only start to animate after the first user interaction.

{{< example >}}
<div id="carouselExampleRide" class="carousel slide" data-bs-ride="true">
<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>
<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleRide" data-bs-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="visually-hidden">Previous</span>
</button>
<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleRide" data-bs-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="visually-hidden">Next</span>
</button>
</div>
{{< /example >}}

### Individual `.carousel-item` interval

Add `data-bs-interval=""` to a `.carousel-item` to change the amount of time to delay between automatically cycling to the next item.
Expand Down Expand Up @@ -206,9 +246,29 @@ Add `data-bs-interval=""` to a `.carousel-item` to change the amount of time to
</div>
{{< /example >}}

### Disable touch swiping
### Autoplaying carousel without controls

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-bs-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 >}}

## Disable touch swiping

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

{{< example >}}
<div id="carouselExampleControlsNoTouching" class="carousel slide" data-bs-touch="false">
Expand Down Expand Up @@ -236,7 +296,7 @@ Carousels support swiping left/right on touchscreen devices to move between slid

## Dark variant

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`.
Add `.carousel-dark` to the `.carousel` for darker controls, indicators, and captions. Controls are inverted compared to their default white fill with the `filter` CSS property. Captions and controls have additional Sass variables that customize the `color` and `background-color`.

{{< example >}}
<div id="carouselExampleDark" class="carousel carousel-dark slide" data-bs-ride="carousel">
Expand Down

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