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v4: Horizontal collapse #36434

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Jun 2, 2022
Merged

v4: Horizontal collapse #36434

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6 changes: 6 additions & 0 deletions scss/_transitions.scss
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Original file line number Diff line number Diff line change
Expand Up @@ -17,4 +17,10 @@
height: 0;
overflow: hidden;
@include transition($transition-collapse);

&.width {
width: 0;
height: auto;
@include transition($transition-collapse-width);
}
}
1 change: 1 addition & 0 deletions scss/_variables.scss
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Expand Up @@ -257,6 +257,7 @@ $caret-spacing: $caret-width * .85 !default;
$transition-base: all .2s ease-in-out !default;
$transition-fade: opacity .15s linear !default;
$transition-collapse: height .35s ease !default;
$transition-collapse-width: width .35s ease !default;

$embed-responsive-aspect-ratios: () !default;
$embed-responsive-aspect-ratios: join(
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23 changes: 23 additions & 0 deletions site/content/docs/4.6/components/collapse.md
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Expand Up @@ -40,6 +40,29 @@ Generally, we recommend using a button with the `data-target` attribute. While n
</div>
{{< /example >}}

## Horizontal

The collapse plugin also supports horizontal collapsing. Add the `.width` modifier class to transition the `width` instead of `height` and set a `width` on the immediate child element. Feel free to write your own custom Sass, use inline styles, or use our [width utilities]({{< docsref "/utilities/sizing" >}}).

{{< callout info >}}
Please note that while the example below has a `min-height` set to avoid excessive repaints in our docs, this is not explicitly required. **Only the `width` on the child element is required.**
{{< /callout >}}

{{< example >}}
<p>
<button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#collapseWidthExample" aria-expanded="false" aria-controls="collapseWidthExample">
Toggle width collapse
</button>
</p>
<div style="min-height: 120px;">
<div class="collapse width" id="collapseWidthExample">
<div class="card card-body" style="width: 320px;">
This is some placeholder content for a horizontal collapse. It's hidden by default and shown when triggered.
</div>
</div>
</div>
{{< /example >}}

## Multiple targets

A `<button>` or `<a>` can show and hide multiple elements by referencing them with a JQuery selector in its `href` or `data-target` attribute.
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