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Offcanvas

Build hidden sidebars into your project for navigation, shopping carts, and more with a few classes and our JavaScript plugin.

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How it works

Offcanvas is a sidebar component that can be toggled via JavaScript to appear from the left, right, top or bottom edge of the viewport. Buttons or anchors are used as triggers that are attached to specific elements you toggle, and data attributes are used to invoke our JavaScript.

Offcanvas shares some of the same JavaScript code as modals. Conceptually, they are quite similar, but they are separate plugins.
Similarly, some source Sass variables for offcanvas’s styles and dimensions are inherited from the modal’s variables.
When shown, offcanvas includes a default backdrop that can be clicked to hide the offcanvas.
Similar to modals, only one offcanvas can be shown at a time.

Heads up! Given how CSS handles animations, you cannot use margin or translate on an .offcanvas element. Instead, use the class as an independent wrapping element.

The animation effect of this component is dependent on the prefers-reduced-motion media query. See the reduced motion section of our accessibility documentation.

Examples

Offcanvas components

Below is an offcanvas example that is shown by default (via .show on .offcanvas). Offcanvas includes support for a header with a close button and an optional body class for some initial padding. We suggest that you include offcanvas headers with dismiss actions whenever possible, or provide an explicit dismiss action.

Content for the offcanvas goes here. You can place just about any Boosted Innovation Cup component or custom elements here.

html

<div class="offcanvas offcanvas-start show" tabindex="-1" id="offcanvas" aria-labelledby="offcanvasLabel">
  <div class="offcanvas-header">
    <h5 class="offcanvas-title" id="offcanvasLabel">Offcanvas</h5>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas"><span class="visually-hidden">Close</span></button>
  </div>
  <div class="offcanvas-body">
    Content for the offcanvas goes here. You can place just about any Boosted Innovation Cup component or custom elements here.
  </div>
</div>

Live demo

Use the buttons below to show and hide an offcanvas element via JavaScript that toggles the .show class on an element with the .offcanvas class.

.offcanvas hides content (default)
.offcanvas.show shows content

You can use a link with the href attribute, or a button with the data-bs-target attribute. In both cases, the data-bs-toggle="offcanvas" is required.

Link with href

Some text as placeholder. In real life you can have the elements you have chosen. Like, text, images, lists, etc.

html

<a class="btn btn-primary" data-bs-toggle="offcanvas" href="#offcanvasExample" role="button" aria-controls="offcanvasExample">
  Link with href
</a>
<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasExample" aria-controls="offcanvasExample">
  Button with data-bs-target
</button>

<div class="offcanvas offcanvas-start" tabindex="-1" id="offcanvasExample" aria-labelledby="offcanvasExampleLabel">
  <div class="offcanvas-header">
    <h5 class="offcanvas-title" id="offcanvasExampleLabel">Offcanvas</h5>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas"><span class="visually-hidden">Close</span></button>
  </div>
  <div class="offcanvas-body">
    <div>
      Some text as placeholder. In real life you can have the elements you have chosen. Like, text, images, lists, etc.
    </div>
    <div class="dropdown mt-3">
      <button class="btn btn-secondary dropdown-toggle" type="button" data-bs-toggle="dropdown">
        Dropdown button
      </button>
      <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Action</a></li>
        <li><a class="dropdown-item" href="#">Another action</a></li>
        <li><a class="dropdown-item" href="#">Something else here</a></li>
      </ul>
    </div>
  </div>
</div>

Body scrolling

Scrolling the <body> element is disabled when an offcanvas and its backdrop are visible. Use the data-bs-scroll attribute to enable <body> scrolling.

Try scrolling the rest of the page to see this option in action.

html

<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasScrolling" aria-controls="offcanvasScrolling">Enable body scrolling</button>

<div class="offcanvas offcanvas-start" data-bs-scroll="true" data-bs-backdrop="false" tabindex="-1" id="offcanvasScrolling" aria-labelledby="offcanvasScrollingLabel">
  <div class="offcanvas-header">
    <h5 class="offcanvas-title" id="offcanvasScrollingLabel">Offcanvas with body scrolling</h5>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas"><span class="visually-hidden">Close</span></button>
  </div>
  <div class="offcanvas-body">
    <p>Try scrolling the rest of the page to see this option in action.</p>
  </div>
</div>

Body scrolling and backdrop

You can also enable <body> scrolling with a visible backdrop.

Try scrolling the rest of the page to see this option in action.

html

<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasWithBothOptions" aria-controls="offcanvasWithBothOptions">Enable both scrolling & backdrop</button>

<div class="offcanvas offcanvas-start" data-bs-scroll="true" tabindex="-1" id="offcanvasWithBothOptions" aria-labelledby="offcanvasWithBothOptionsLabel">
  <div class="offcanvas-header">
    <h5 class="offcanvas-title" id="offcanvasWithBothOptionsLabel">Backdrop with scrolling</h5>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas"><span class="visually-hidden">Close</span></button>
  </div>
  <div class="offcanvas-body">
    <p>Try scrolling the rest of the page to see this option in action.</p>
  </div>
</div>

Static backdrop

When backdrop is set to static, the offcanvas will not close when clicking outside of it.

I will not close if you click outside of me.

html

<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#staticBackdrop" aria-controls="staticBackdrop">
  Toggle static offcanvas
</button>

<div class="offcanvas offcanvas-start" data-bs-backdrop="static" tabindex="-1" id="staticBackdrop" aria-labelledby="staticBackdropLabel">
  <div class="offcanvas-header">
    <h5 class="offcanvas-title" id="staticBackdropLabel">Offcanvas</h5>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas"><span class="visually-hidden">Close</span></button>
  </div>
  <div class="offcanvas-body">
    <div>
      I will not close if you click outside of me.
    </div>
  </div>
</div>

Dark offcanvas

Change the appearance of offcanvases with utilities to better match them to different contexts like dark navbars. Here we add .text-bg-dark to the .offcanvas and .btn-close-white to .btn-close for proper styling with a dark offcanvas. If you have dropdowns within, consider also adding .dropdown-menu-dark to .dropdown-menu.

Place offcanvas content here.

html

<div class="offcanvas offcanvas-start show text-bg-dark" tabindex="-1" id="offcanvasDark" aria-labelledby="offcanvasDarkLabel">
  <div class="offcanvas-header">
    <h5 class="offcanvas-title" id="offcanvasDarkLabel">Offcanvas</h5>
    <button type="button" class="btn-close btn-close-white" data-bs-dismiss="offcanvasDark" aria-label="Close"></button>
  </div>
  <div class="offcanvas-body">
    <p>Place offcanvas content here.</p>
  </div>
</div>

Responsive

Responsive offcanvas classes hide content outside the viewport from a specified breakpoint and down. Above that breakpoint, the contents within will behave as usual. For example, .offcanvas-lg hides content in an offcanvas below the lg breakpoint, but shows the content above the lg breakpoint.

Resize your browser to show the responsive offcanvas toggle.

This is content within an .offcanvas-lg.

html

<button class="btn btn-primary d-lg-none" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasResponsive" aria-controls="offcanvasResponsive">Toggle offcanvas</button>

<div class="alert alert-info d-none d-lg-block">Resize your browser to show the responsive offcanvas toggle.</div>

<div class="offcanvas-lg offcanvas-end" tabindex="-1" id="offcanvasResponsive" aria-labelledby="offcanvasResponsiveLabel">
  <div class="offcanvas-header">
    <h5 class="offcanvas-title" id="offcanvasResponsiveLabel">Responsive offcanvas</h5>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas" data-bs-target="#offcanvasResponsive"><span class="visually-hidden">Close</span></button>
  </div>
  <div class="offcanvas-body">
    <p class="mb-0">This is content within an <code>.offcanvas-lg</code>.</p>
  </div>
</div>

Responsive offcanvas classes are available across for each breakpoint.

.offcanvas
.offcanvas-sm
.offcanvas-md
.offcanvas-lg
.offcanvas-xl
.offcanvas-xxl

Placement

There’s no default placement for offcanvas components, so you must add one of the modifier classes below.

.offcanvas-start places offcanvas on the left of the viewport (shown above)
.offcanvas-end places offcanvas on the right of the viewport
.offcanvas-top places offcanvas on the top of the viewport
.offcanvas-bottom places offcanvas on the bottom of the viewport

Try the top, right, and bottom examples out below.

...

html

<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasTop" aria-controls="offcanvasTop">Toggle top offcanvas</button>

<div class="offcanvas offcanvas-top" tabindex="-1" id="offcanvasTop" aria-labelledby="offcanvasTopLabel">
  <div class="offcanvas-header">
    <h5 class="offcanvas-title" id="offcanvasTopLabel">Offcanvas top</h5>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas"><span class="visually-hidden">Close</span></button>
  </div>
  <div class="offcanvas-body">
    ...
  </div>
</div>

...

html

<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasRight" aria-controls="offcanvasRight">Toggle right offcanvas</button>

<div class="offcanvas offcanvas-end" tabindex="-1" id="offcanvasRight" aria-labelledby="offcanvasRightLabel">
  <div class="offcanvas-header">
    <h5 class="offcanvas-title" id="offcanvasRightLabel">Offcanvas right</h5>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas"><span class="visually-hidden">Close</span></button>
  </div>
  <div class="offcanvas-body">
    ...
  </div>
</div>

...

html

<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasBottom" aria-controls="offcanvasBottom">Toggle bottom offcanvas</button>

<div class="offcanvas offcanvas-bottom" tabindex="-1" id="offcanvasBottom" aria-labelledby="offcanvasBottomLabel">
  <div class="offcanvas-header">
    <h5 class="offcanvas-title" id="offcanvasBottomLabel">Offcanvas bottom</h5>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas"><span class="visually-hidden">Close</span></button>
  </div>
  <div class="offcanvas-body small">
    ...
  </div>
</div>

Accessibility

Since the offcanvas panel is conceptually a modal dialog, be sure to add aria-labelledby="..."—referencing the offcanvas title—to .offcanvas. Note that you don’t need to add role="dialog" since we already add it via JavaScript.

CSS

Variables

As part of Bootstrap’s evolving CSS variables approach, offcanvas now uses local CSS variables on .offcanvas for enhanced real-time customization. Values for the CSS variables are set via Sass, so Sass customization is still supported, too.

  --#{$prefix}offcanvas-zindex: #{$zindex-offcanvas};
  --#{$prefix}offcanvas-width: #{$offcanvas-horizontal-width};
  --#{$prefix}offcanvas-height: #{$offcanvas-vertical-height};
  --#{$prefix}offcanvas-padding-x: #{$offcanvas-padding-x};
  --#{$prefix}offcanvas-padding-y: #{$offcanvas-padding-y};
  --#{$prefix}offcanvas-color: #{$offcanvas-color};
  --#{$prefix}offcanvas-bg: #{$offcanvas-bg-color};
  --#{$prefix}offcanvas-border-width: #{$offcanvas-border-width};
  --#{$prefix}offcanvas-border-color: #{$offcanvas-border-color};
  --#{$prefix}offcanvas-box-shadow: #{$offcanvas-box-shadow};
  --#{$prefix}offcanvas-title-line-height: #{$offcanvas-title-line-height}; // Boosted mod
  --#{$prefix}offcanvas-transition-duration: #{$offcanvas-transition-duration}; // Boosted mod

Customization of the offcanvas backdrop visibility through CSS variables can be seen on the .offcanvas-backdrop modifier class where we override specific values without adding duplicate CSS selectors.

  --#{$prefix}offcanvas-backdrop-bg: #{$offcanvas-backdrop-bg}; // Boosted mod
  --#{$prefix}offcanvas-backdrop-opacity: #{$offcanvas-backdrop-opacity}; // Boosted mod
  --#{$prefix}offcanvas-backdrop-zindex: #{$zindex-offcanvas-backdrop}; // Boosted mod

Sass variables

$offcanvas-padding-y:               $modal-inner-padding;
$offcanvas-padding-x:               $modal-inner-padding;
$offcanvas-horizontal-width:        400px;
$offcanvas-vertical-height:         30vh;
$offcanvas-transition-duration:     .3s;
$offcanvas-border-color:            $modal-content-border-color;
$offcanvas-border-width:            $modal-content-border-width;
$offcanvas-title-line-height:       $modal-title-line-height;
$offcanvas-bg-color:                $modal-content-bg;
$offcanvas-color:                   $modal-content-color;
$offcanvas-box-shadow:              $modal-content-box-shadow-xs;
$offcanvas-backdrop-bg:             $modal-backdrop-bg;
$offcanvas-backdrop-opacity:        $modal-backdrop-opacity;

Usage

The offcanvas plugin utilizes a few classes and attributes to handle the heavy lifting:

.offcanvas hides the content
.offcanvas.show shows the content
.offcanvas-start hides the offcanvas on the left
.offcanvas-end hides the offcanvas on the right
.offcanvas-top hides the offcanvas on the top
.offcanvas-bottom hides the offcanvas on the bottom

Add a dismiss button with the data-bs-dismiss="offcanvas" attribute, which triggers the JavaScript functionality. Be sure to use the <button> element with it for proper behavior across all devices.

Via data attributes

Toggle

Add data-bs-toggle="offcanvas" and a data-bs-target or href to the element to automatically assign control of one offcanvas element. The data-bs-target attribute accepts a CSS selector to apply the offcanvas to. Be sure to add the class offcanvas to the offcanvas element. If you’d like it to default open, add the additional class show.

Dismiss

Dismissal can be achieved with the data attribute on a button within the offcanvas as demonstrated below:

<button type="button" class="btn-close" data-bs-dismiss="offcanvas"><span class="visually-hidden">Close</span></button>

or on a button outside the offcanvas using the data-bs-target as demonstrated below:

<button type="button" class="btn-close" data-bs-dismiss="offcanvas" data-bs-target="#my-offcanvas"><span class="visually-hidden">Close</span></button>

While both ways to dismiss an offcanvas are supported, keep in mind that dismissing from outside an offcanvas does not match the ARIA Authoring Practices Guide dialog (modal) pattern. Do this at your own risk.

Via JavaScript

Enable manually with:

const offcanvasElementList = document.querySelectorAll('.offcanvas')
const offcanvasList = [...offcanvasElementList].map(offcanvasEl => new boosted.Offcanvas(offcanvasEl))

Options

As options can be passed via data attributes or JavaScript, you can append an option name to data-bs-, as in data-bs-animation="{value}". Make sure to change the case type of the option name from “camelCase” to “kebab-case” when passing the options via data attributes. For example, use data-bs-custom-class="beautifier" instead of data-bs-customClass="beautifier".

All components support an experimental reserved data attribute data-bs-config that can house simple component configuration as a JSON string. When an element has data-bs-config='{"delay":0, "title":123}' and data-bs-title="456" attributes, the final title value will be 456 and the separate data attributes will override values given on data-bs-config. In addition, existing data attributes are able to house JSON values like data-bs-delay='{"show":0,"hide":150}'.

Name	Type	Default	Description
`backdrop`	boolean or the string `static`	`true`	Apply a backdrop on body while offcanvas is open. Alternatively, specify `static` for a backdrop which doesn’t close the offcanvas when clicked.
`keyboard`	boolean	`true`	Closes the offcanvas when escape key is pressed.
`scroll`	boolean	`false`	Allow body scrolling while offcanvas is open.

Methods

Asynchronous methods and transitions

All API methods are asynchronous and start a transition. They return to the caller as soon as the transition is started but before it ends. In addition, a method call on a transitioning component will be ignored.

See our JavaScript documentation for more information.

Activates your content as an offcanvas element. Accepts an optional options object.

You can create an offcanvas instance with the constructor, for example:

const bsOffcanvas = new boosted.Offcanvas('#myOffcanvas')

Method	Description
`getInstance`	Static method which allows you to get the offcanvas instance associated with a DOM element.
`getOrCreateInstance`	Static method which allows you to get the offcanvas instance associated with a DOM element, or create a new one in case it wasn’t initialized.
`hide`	Hides an offcanvas element. Returns to the caller before the offcanvas element has actually been hidden (i.e. before the `hidden.bs.offcanvas` event occurs).
`show`	Shows an offcanvas element. Returns to the caller before the offcanvas element has actually been shown (i.e. before the `shown.bs.offcanvas` event occurs).
`toggle`	Toggles an offcanvas element to shown or hidden. Returns to the caller before the offcanvas element has actually been shown or hidden (i.e. before the `shown.bs.offcanvas` or `hidden.bs.offcanvas` event occurs).

Events

Boosted Innovation Cup’s offcanvas class exposes a few events for hooking into offcanvas functionality.

Event type	Description
`hide.bs.offcanvas`	This event is fired immediately when the `hide` method has been called.
`hidePrevented.bs.offcanvas`	This event is fired when the offcanvas is shown, its backdrop is `static` and a click outside of the offcanvas is performed. The event is also fired when the escape key is pressed and the `keyboard` option is set to `false`.
`hidden.bs.offcanvas`	This event is fired when an offcanvas element has been hidden from the user (will wait for CSS transitions to complete).
`show.bs.offcanvas`	This event fires immediately when the `show` instance method is called.
`shown.bs.offcanvas`	This event is fired when an offcanvas element has been made visible to the user (will wait for CSS transitions to complete).

const myOffcanvas = document.getElementById('myOffcanvas')
myOffcanvas.addEventListener('hidden.bs.offcanvas', event => {
  // do something...
})