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Backport #32037 (#32833)

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* Backport #32037

Add `.navbar-nav-scroll` for vertical scrolling of navbar content

* drop the css var for a Sass css

Co-authored-by: Mark Otto <markdotto@gmail.com>
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XhmikosR 2021-01-19 08:18:19 +02:00 committed by GitHub
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9
scss/_navbar.scss
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@ -139,6 +139,11 @@
background: 50% / 100% 100% no-repeat;
}
.navbar-nav-scroll {
max-height: $navbar-nav-scroll-max-height;
overflow-y: auto;
}
// Generate series of `.navbar-expand-*` responsive classes for configuring
// where your navbar collapses.
.navbar-expand {
@ -198,6 +203,10 @@
}
}
.navbar-nav-scroll {
overflow: visible;
}
.navbar-collapse {
display: flex !important; // stylelint-disable-line declaration-no-important

2
scss/_variables.scss
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@ -731,6 +731,8 @@ $navbar-toggler-padding-x: .75rem !default;
$navbar-toggler-font-size: $font-size-lg !default;
$navbar-toggler-border-radius: $btn-border-radius !default;
$navbar-nav-scroll-max-height: 75vh !default;
$navbar-dark-color: rgba($white, .5) !default;
$navbar-dark-hover-color: rgba($white, .75) !default;
$navbar-dark-active-color: $white !default;

45
site/content/docs/4.5/components/navbar.md
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@ -438,6 +438,51 @@ Also note that **`.sticky-top` uses `position: sticky`, which [isn't fully suppo
</nav>
{{< /example >}}
## Scrolling
Add `.navbar-nav-scroll` to a `.navbar-collapse` (or other navbar sub-component) to enable vertical scrolling within the toggleable contents of a collapsed navbar. By default, scrolling kicks in at `75vh` (or 75% of the viewport height), but you can override that with inline or custom styles. At larger viewports when the navbar is expanded, content will appear as it does in a default navbar.
Please note that this behavior comes with a potential drawback of `overflow`—when setting `overflow-y: auto` (required to scroll the content here), `overflow-x` is the equivalent of `auto`, which will crop some horizontal content.
Here's an example navbar using `.navbar-nav-scroll` with `style="max-height: 100px;"`, with some extra margin utilities for optimum spacing.
{{< example >}}
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar scroll</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarScroll" aria-controls="navbarScroll" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarScroll">
<ul class="navbar-nav mr-auto my-2 my-lg-0 navbar-nav-scroll" style="max-height: 100px;">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarScrollingDropdown" role="button" data-toggle="dropdown" aria-expanded="false">
Link
</a>
<ul class="dropdown-menu" aria-labelledby="navbarScrollingDropdown">
<li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li>
<li><hr class="dropdown-divider"></li>
<li><a class="dropdown-item" href="#">Something else here</a></li>
</ul>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Link</a>
</li>
</ul>
<form class="d-flex">
<input class="form-control mr-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success" type="submit">Search</button>
</form>
</div>
</nav>
{{< /example >}}
## Responsive behaviors
Navbars can use `.navbar-toggler`, `.navbar-collapse`, and `.navbar-expand{-sm|-md|-lg|-xl}` classes to determine when their content collapses behind a button. In combination with other utilities, you can easily choose when to show or hide particular elements.