Co-authored-by: Patrick H. Lauke <redux@splintered.co.uk>
35 KiB
layout | title | description | group | toc |
---|---|---|---|---|
docs | Navbar | Documentation and examples for Bootstrap's powerful, responsive navigation header, the navbar. Includes support for branding, navigation, and more, including support for our collapse plugin. | components | true |
How it works
Here's what you need to know before getting started with the navbar:
- Navbars require a wrapping
.navbar
with.navbar-expand{-sm|-md|-lg|-xl|-xxl}
for responsive collapsing and color scheme classes. - Navbars and their contents are fluid by default. Change the container to limit their horizontal width in different ways.
- Use our [spacing]({{< docsref "/utilities/spacing" >}}) and [flex]({{< docsref "/utilities/flex" >}}) utility classes for controlling spacing and alignment within navbars.
- Navbars are responsive by default, but you can easily modify them to change that. Responsive behavior depends on our Collapse JavaScript plugin.
- Ensure accessibility by using a
<nav>
element or, if using a more generic element such as a<div>
, add arole="navigation"
to every navbar to explicitly identify it as a landmark region for users of assistive technologies. - Indicate the current item by using
aria-current="page"
for the current page oraria-current="true"
for the current item in a set. - New in v5.2.0: Navbars can be themed with CSS variables that are scoped to the
.navbar
base class..navbar-light
has been deprecated and.navbar-dark
has been rewritten to override CSS variables instead of adding additional styles.
{{< callout info >}} {{< partial "callouts/info-prefersreducedmotion.md" >}} {{< /callout >}}
Supported content
Navbars come with built-in support for a handful of sub-components. Choose from the following as needed:
.navbar-brand
for your company, product, or project name..navbar-nav
for a full-height and lightweight navigation (including support for dropdowns)..navbar-toggler
for use with our collapse plugin and other navigation toggling behaviors.- Flex and spacing utilities for any form controls and actions.
.navbar-text
for adding vertically centered strings of text..collapse.navbar-collapse
for grouping and hiding navbar contents by a parent breakpoint.- Add an optional
.navbar-scroll
to set amax-height
and scroll expanded navbar content.
Here's an example of all the sub-components included in a responsive light-themed navbar that automatically collapses at the lg
(large) breakpoint.
{{< example >}}
{{< /example >}}This example uses [background]({{< docsref "/utilities/background" >}}) (bg-body-tertiary
) and [spacing]({{< docsref "/utilities/spacing" >}}) (me-auto
, mb-2
, mb-lg-0
, me-2
) utility classes.
Brand
The .navbar-brand
can be applied to most elements, but an anchor works best, as some elements might require utility classes or custom styles.
Text
Add your text within an element with the .navbar-brand
class.
{{< example >}}
Image
You can replace the text within the .navbar-brand
with an <img>
.
{{< example >}}
{{< /example >}}Image and text
You can also make use of some additional utilities to add an image and text at the same time. Note the addition of .d-inline-block
and .align-text-top
on the <img>
.
{{< example >}}
{{< /example >}}Nav
Navbar navigation links build on our .nav
options with their own modifier class and require the use of toggler classes for proper responsive styling. Navigation in navbars will also grow to occupy as much horizontal space as possible to keep your navbar contents securely aligned.
Add the .active
class on .nav-link
to indicate the current page.
Please note that you should also add the aria-current
attribute on the active .nav-link
.
{{< example >}}
{{< /example >}}And because we use classes for our navs, you can avoid the list-based approach entirely if you like.
{{< example >}}
{{< /example >}}You can also use dropdowns in your navbar. Dropdown menus require a wrapping element for positioning, so be sure to use separate and nested elements for .nav-item
and .nav-link
as shown below.
{{< example >}}
{{< /example >}}Forms
Place various form controls and components within a navbar:
{{< example >}}
Immediate child elements of .navbar
use flex layout and will default to justify-content: space-between
. Use additional [flex utilities]({{< docsref "/utilities/flex" >}}) as needed to adjust this behavior.
{{< example >}}
Input groups work, too. If your navbar is an entire form, or mostly a form, you can use the <form>
element as the container and save some HTML.
{{< example >}}
Various buttons are supported as part of these navbar forms, too. This is also a great reminder that vertical alignment utilities can be used to align different sized elements.
{{< example >}}
Main button Smaller button {{< /example >}}Text
Navbars may contain bits of text with the help of .navbar-text
. This class adjusts vertical alignment and horizontal spacing for strings of text.
{{< example >}}
Mix and match with other components and utilities as needed.
{{< example >}}
{{< /example >}}Color schemes
{{< callout warning >}}
New dark navbars in v5.3.0 — We've deprecated .navbar-dark
in favor of the new data-bs-theme="dark"
. Add data-bs-theme="dark"
to the .navbar
to enable a component-specific color mode. [Learn more about our color modes.]({{< docsref "/customize/color-modes" >}})
New in v5.2.0 — Navbar theming is now powered by CSS variables and .navbar-light
has been deprecated. CSS variables are applied to .navbar
, defaulting to the "light" appearance, and can be overridden with .navbar-dark
.
{{< /callout >}}
Navbar themes are easier than ever thanks to Bootstrap's combination of Sass and CSS variables. The default is our "light navbar" for use with light background colors, but you can also apply data-bs-theme="dark"
to the .navbar
parent for dark background colors. Then, customize with .bg-*
utilities.
<nav class="navbar bg-dark" data-bs-theme="dark">
<!-- Navbar content -->
</nav>
<nav class="navbar bg-primary" data-bs-theme="dark">
<!-- Navbar content -->
</nav>
<nav class="navbar" style="background-color: #e3f2fd;">
<!-- Navbar content -->
</nav>
Containers
Although it's not required, you can wrap a navbar in a .container
to center it on a page–though note that an inner container is still required. Or you can add a container inside the .navbar
to only center the contents of a fixed or static top navbar.
{{< example >}}
{{< /example >}}Use any of the responsive containers to change how wide the content in your navbar is presented.
{{< example >}}
{{< /example >}}Placement
Use our [position utilities]({{< docsref "/utilities/position" >}}) to place navbars in non-static positions. Choose from fixed to the top, fixed to the bottom, stickied to the top (scrolls with the page until it reaches the top, then stays there), or stickied to the bottom (scrolls with the page until it reaches the bottom, then stays there).
Fixed navbars use position: fixed
, meaning they're pulled from the normal flow of the DOM and may require custom CSS (e.g., padding-top
on the <body>
) to prevent overlap with other elements.
{{< example >}}
{{< /example >}}{{< example >}}
{{< /example >}}{{< example >}}
{{< /example >}}{{< example >}}
{{< /example >}}{{< example >}}
{{< /example >}}Scrolling
Add .navbar-nav-scroll
to a .navbar-nav
(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 the local CSS custom property --bs-navbar-height
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="--bs-scroll-height: 100px;"
, with some extra margin utilities for optimum spacing.
{{< example >}}
{{< /example >}}Responsive behaviors
Navbars can use .navbar-toggler
, .navbar-collapse
, and .navbar-expand{-sm|-md|-lg|-xl|-xxl}
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.
For navbars that never collapse, add the .navbar-expand
class on the navbar. For navbars that always collapse, don't add any .navbar-expand
class.
Toggler
Navbar togglers are left-aligned by default, but should they follow a sibling element like a .navbar-brand
, they'll automatically be aligned to the far right. Reversing your markup will reverse the placement of the toggler. Below are examples of different toggle styles.
With no .navbar-brand
shown at the smallest breakpoint:
{{< example >}}
With a brand name shown on the left and toggler on the right:
{{< example >}}
{{< /example >}}With a toggler on the left and brand name on the right:
{{< example >}}
{{< /example >}}External content
Sometimes you want to use the collapse plugin to trigger a container element for content that structurally sits outside of the .navbar
. Because our plugin works on the id
and data-bs-target
matching, that's easily done!
{{< example >}}
When you do this, we recommend including additional JavaScript to move the focus programmatically to the container when it is opened. Otherwise, keyboard users and users of assistive technologies will likely have a hard time finding the newly revealed content - particularly if the container that was opened comes before the toggler in the document's structure. We also recommend making sure that the toggler has the aria-controls
attribute, pointing to the id
of the content container. In theory, this allows assistive technology users to jump directly from the toggler to the container it controls–but support for this is currently quite patchy.
Offcanvas
Transform your expanding and collapsing navbar into an offcanvas drawer with the [offcanvas component]({{< docsref "/components/offcanvas" >}}). We extend both the offcanvas default styles and use our .navbar-expand-*
classes to create a dynamic and flexible navigation sidebar.
In the example below, to create an offcanvas navbar that is always collapsed across all breakpoints, omit the .navbar-expand-*
class entirely.
{{< example >}}
{{< /example >}}To create an offcanvas navbar that expands into a normal navbar at a specific breakpoint like lg
, use .navbar-expand-lg
.
<nav class="navbar navbar-expand-lg bg-body-tertiary fixed-top">
<a class="navbar-brand" href="#">Offcanvas navbar</a>
<button class="navbar-toggler" type="button" data-bs-toggle="offcanvas" data-bs-target="#navbarOffcanvasLg" aria-controls="navbarOffcanvasLg" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="offcanvas offcanvas-end" tabindex="-1" id="navbarOffcanvasLg" aria-labelledby="navbarOffcanvasLgLabel">
...
</div>
</nav>
When using offcanvas in a dark navbar, be aware that you may need to have a dark background on the offcanvas content to avoid the text becoming illegible. In the example below, we add .navbar-dark
and .bg-dark
to the .navbar
, .text-bg-dark
to the .offcanvas
, .dropdown-menu-dark
to .dropdown-menu
, and .btn-close-white
to .btn-close
for proper styling with a dark offcanvas.
{{< example >}}
{{< /example >}}CSS
Variables
{{< added-in "5.2.0" >}}
As part of Bootstrap's evolving CSS variables approach, navbars now use local CSS variables on .navbar
for enhanced real-time customization. Values for the CSS variables are set via Sass, so Sass customization is still supported, too.
{{< scss-docs name="navbar-css-vars" file="scss/_navbar.scss" >}}
Some additional CSS variables are also present on .navbar-nav
:
{{< scss-docs name="navbar-nav-css-vars" file="scss/_navbar.scss" >}}
Customization through CSS variables can be seen on the .navbar-dark
class where we override specific values without adding duplicate CSS selectors.
{{< scss-docs name="navbar-dark-css-vars" file="scss/_navbar.scss" >}}
Sass variables
Variables for all navbars:
{{< scss-docs name="navbar-variables" file="scss/_variables.scss" >}}
Variables for the dark navbar:
{{< scss-docs name="navbar-dark-variables" file="scss/_variables.scss" >}}
Sass loop
Responsive navbar expand/collapse classes (e.g., .navbar-expand-lg
) are combined with the $breakpoints
map and generated through a loop in scss/_navbar.scss
.
{{< scss-docs name="navbar-expand-loop" file="scss/_navbar.scss" >}}