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Bootstrap/site/content/docs/5.2/components/navbar.md
Mark Otto fc3f4b67d6
Add dark mode support (#35857)
* Add dark mode to docs

* Minor fix: missing space indentation

* Minor fix: revert utilities/z-index added-in modification

* Remove prev: and next: from doc because extracted to another PR

* Use .bg-body-tertiary in all Utilities > Overflow examples

* fix example

* Fix up spacing examples

* Update box-shadow Sass variables and utilities to auto-adjust to color modes

* Remove unused docs class

* Refactor form styles to use CSS variable for background images on .form-check and .form-switch

* Fix docs selector

* Rename shortcut for clarity

* Heading consistency

* Reintroduce missing 4th grid item in Utilities > Spacing example

* Fix bundlewatch

* .bd-callout* rendering is OK so removing comments in the code

* Update scss/_utilities.scss

Co-authored-by: Julien Déramond <julien.deramond@orange.com>

* Fix gutters example styling

* Fix text colors on background utils docs

* redesign and fix up position marker example, which doesn't show nicely in darkmode but at least isn't broken

* fix some color utils examples

* Deprecate mixin notice

* Deprecate notice for list-group-item-variant() mixin

* Revamp new link CSS vars

* Use map-keys in some each Sass files

* Remove list-group-item-variant mixin ref in sass loop desc

* Display CSS vars scoped to our built-in dark mode

* Revert previous commit

* Fix list group variant link

* Fix typo

* Remove imports of alert/list-group mixins in scss/_mixins.scss

* Small formatting + comments removal in scss/_content.scss

* Fix alert links colors

* fix dropdown border-radius mixin

* fix link color and underline again, this time using CSS var override for color var and fallback value for the underline

* fix colors on docs navbar for dark mode

* remove two changes

* missing ref

* another link underline fix, just use sass vars for link decoration for now

* missing color bg docs, plus move dropdown override to scss

* more changes from review

* fix some examples, drop unused docs navbar styles, update docs navbar color mode to use mixin

* Few fixes around type

- Restored CSS variable for color on headings, this time with a fallback value
- In conjunction, restored and wrapped the default CSS var with a null value check
- Split headings and paragraphs docs in Reboot, elaborated on them

* Restyle custom details > summary element in docs

* Rewrite some migration docs

* fix form checks

* Fix up some navbar styling, tweak docs callout

* Fix select images, mostly for validation styling

* Clean up some migration notes, document some new form control CSS vars, mention new variables-dark in sass docs

* Update site/content/docs/5.2/components/scrollspy.md

Co-authored-by: Julien Déramond <julien.deramond@orange.com>

* Apply suggestions from code review

Co-authored-by: Julien Déramond <julien.deramond@orange.com>

* mention form control css vars in migration guide

* Tweak grid and flex docs background examples

* clarify some docs

* fix some more things

Co-authored-by: Julien Déramond <juderamond@gmail.com>
Co-authored-by: Julien Déramond <julien.deramond@orange.com>
2022-11-28 22:30:26 -08:00

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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 a role="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 or aria-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 a max-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 >}}

Navbar
{{< /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 >}}

Search
{{< /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 >}}

Navbar Search
{{< /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 >}}

@
{{< /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 >}}

Navbar text with an inline element
{{< /example >}}

Mix and match with other components and utilities as needed.

{{< example >}}

Navbar w/ text
Navbar text with an inline element
{{< /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 .navbar-dark 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 pagethough 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 >}}

Hidden brand Search
{{< /example >}}

With a brand name shown on the left and toggler on the right:

{{< example >}}

Navbar
Search
{{< /example >}}

With a toggler on the left and brand name on the right:

{{< example >}}

Navbar
Search
{{< /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 >}}

Collapsed content
Toggleable via the navbar brand.
{{< /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 controlsbut 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">
    <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" >}}