3.0.16 • Public • Published


A container component that slides in from the left or right. Typically containing menus, search or other content.

npm version



npm install @vrembem/drawer


@use "@vrembem/drawer";


import Drawer from '@vrembem/drawer';
const drawer = new Drawer({ autoInit: true });


Drawers are composed using classes and data attributes for their triggers. The basic structure of a drawer is an element with an id and drawer class containing a child element with the drawer__dialog class. There are two required structure elements for drawers to work correctly:

  • drawer-frame: Applied to the parent element wrapping all drawers and the main content.
  • drawer-main: Applied to the element containing the main content. This should be the last child of the drawer-frame element.
<div class="drawer-frame">

  <aside id="drawer-id" class="drawer">
    <div class="drawer__dialog">

  <div class="drawer-main">


Drawer triggers are defined using three data attributes:

  • data-drawer-open: Opens a drawer. Takes the id of the drawer it's meant to open.
  • data-drawer-close: Closes a drawer. Will close the parent drawer if left value-less. Can also take an id of a drawer to close.
  • data-drawer-toggle: Toggles a drawer opened or closed. Takes the id of the drawer it's meant to toggle.
<button data-drawer-open="drawer-id">...</button>
<button data-drawer-close="drawer-id">...</button>
<button data-drawer-toggle="drawer-id">...</button>

The dialog element of a drawer is defined using the drawer__dialog class. Along with a role attribute (e.g. role="dialog"), authors should provide drawer dialogs with aria-labelledby and aria-describedby attributes if applicable to further improve accessibility. The aria-modal attribute is applied automatically based on if the drawer is currently in 'modal' mode.

<aside id="drawer-id" class="drawer">
  <div class="drawer__dialog dialog" role="dialog" aria-labelledby="dialog-title" aria-describedby="dialog-description">
    <div class="dialog__header">
      <h2 id="dialog-title">...</h2>
    <div class="dialog__body">
      <p id="dialog-description">...</p>
    <div class="dialog__footer">

The dialog component is a great fit for composing a drawer's dialog.

Modal Drawers

To create a modal drawer, apply the drawer_modal modifier.

<aside id="drawer-id" class="drawer drawer_modal">

You can also switch a drawer from 'inline' to 'modal' by changing the collection API mode property:

// Get the drawer object from the collection.
const entry = drawer.get('drawer-id');

// Set it's mode to either 'modal' or 'inline'.
entry.mode = 'modal';

In cases where you'd like a drawer to switch modes based on a specific viewport width, use the data-drawer-breakpoint data attribute with either a width value or a breakpoint key.

<!-- Switches to modal below 1200px viewports -->
<aside id="drawer-id" class="drawer" data-drawer-breakpoint="1200px">

<!-- Switches to modal below "md" breakpoint viewports -->
<aside id="drawer-id" class="drawer" data-drawer-breakpoint="md">

A custom breakpoints object can be passed in using the breakpoints option. Otherwise, breakpoints are resolved by looking up a CSS variable using the passed key (e.g: --vb-breakpoint-[key]).

const drawer = new Drawer({
  breakpoints: {
    xs: '480px',
    sm: '620px',
    md: '760px',
    lg: '990px',
    xl: '1380px'
:root {
  --vb-breakpoint-xs: 480px;
  --vb-breakpoint-sm: 620px;
  --vb-breakpoint-md: 760px;
  --vb-breakpoint-lg: 990px;
  --vb-breakpoint-xl: 1380px;

While a modal drawer is active, the contents obscured by the modal are made inaccessible to all users via a focus trap. This means that the TAB key, and a screen reader’s virtual cursor (arrow keys) should not be allowed to leave the drawer dialog and traverse the content outside of the dialog. This does not apply to inline drawers.

Focus Management

Drawer dialogs are given focus when opened as long as the setTabindex option is set to true or if the drawer dialog has tabindex="-1" set manually. If focus on a specific element inside a drawer is preferred, give that element the data-focus attribute. Focus is returned to the element that initially triggered the drawer once closed.

<div class="drawer-frame">
  <!-- Focuses the drawer dialog on open -->
  <aside id="drawer-id" class="drawer">
    <div class="drawer__dialog" tabindex="-1">

  <!-- Focuses an inner element on open -->
  <aside id="drawer-id" class="drawer">
    <div class="drawer__dialog">
      <input data-focus type="text">
  <div class="drawer-main">
    <!-- Return focus to toggle on close -->
    <button data-drawer-toggle="drawer-id">...</button>

To change the selector used in finding the preferred focus element, pass your own selector via the selectorFocus option (defaults to '[data-focus]').

Drawer State

The state of all drawers are saved to local storage and applied persistently under the VB:DrawerState local storage key. Set store: false to disable the local storage feature. Use storeKey: "CUSTOM-KEY" to change the key that local store is saved under.

Behavior and Accessibility

Drawers while in their modal state follow a set of patterns expected from other modals on the web. Here's what to expect:

  1. When a modal drawer is opened, focus is moved to the dialog or an element inside.
  2. Modal drawers provide standard methods for the user to close such as using the esc key or clicking outside the dialog.
  3. While the modal drawer is active, contents obscured by the modal are inaccessible to all users.
  4. When a modal drawer is closed, focus is returned to the initial trigger element that activated the dialog.

To take full advantage of modal drawer's accessibility features, it's recommended to set the selectorInert option to all elements that are outside the modal (most likely the drawer-main element). All elements that match the selectorInert selector will be given the inert attribute as well as aria-hidden="true" when a modal is opened.

Inert is not currently widely supported by all browsers. Consider using a polyfill such as wicg-inert or Google's inert-polyfill.


Here's an example where we want the drawer-main content area to be inaccessible while drawer modals are open. We also want to disable other scrollable elements using the selectorOverflow option.

const drawer = new Drawer({
  selectorInert: '.drawer-main',
  selectorOverflow: 'body, .drawer-main'

await drawer.init();



Applies modal drawer styles to a drawer. To convert a drawer to its modal state after its been registered, set the collection API mode property to 'modal'. Only one modal can be open at a time.

<aside id="drawer-id" class="drawer drawer_modal">


Drawers slide in from the left by default. To create a right side drawer, use the drawer_switch modifier.

<aside id="drawer-right" class="drawer drawer_switch">


Sass Variables

Variable Default Description
$prefix-block null String to prefix blocks with.
$prefix-element "__" String to prefix elements with.
$prefix-modifier "_" String to prefix modifiers with.
$prefix-modifier-value "_" String to prefix modifier values with.
$class-frame $prefix-block'drawer-frame' Class name to use for the drawer-frame element.
$class-main $prefix-block'drawer-main' Class name to use for the drawer-main element.
$width 18em The width of drawers.
$max-width 100% The max-width of drawers.
$border null Border applied to drawer items with position modifiers. Shown on side of drawers facing drawer main.
$sep-border null Border color applied to dialog elements within drawers.
$background core.$shade Background color applied to drawer items.
$box-shadow none Box shadow applied to drawer items.
$transition-duration core.$transition-duration Duration of drawer transition.
$transition-timing-function core.$transition-timing-function Timing function used for drawer transitions.
$frame-height 100vh Height given to the drawer-frame element.
$modal-z-index 900 Modal z-index to help control the stack order. Should be highest priority as modal.
$modal-width $width The width of modal drawers.
$modal-max-width 80% The max-width of modal drawers.
$modal-sep-border null Border color applied to dialog elements within modal drawers.
$modal-background core.$white Background color applied to modal drawer items.
$modal-box-shadow core.$box-shadow-5 Box shadow applied to modal drawer items.
$modal-screen-background core.$night Background color of modal screen.
$modal-screen-background-alpha 0.8 The alpha channel for the modal screen.

JavaScript Options

Key Default Description
autoInit false Automatically initializes the instance.
dataOpen 'drawer-open' Data attribute for a drawer open trigger.
dataClose 'drawer-close' Data attribute for a drawer close trigger.
dataToggle 'drawer-toggle' Data attribute for a drawer toggle trigger.
dataBreakpoint 'drawer-breakpoint' Data attribute for setting a drawer's breakpoint.
dataBreakpoint 'drawer-config' Data attribute to find drawer specific configuration settings. Value should be a JSON object.
selectorDrawer '.drawer' Selector for dialog element.
selectorDialog '.drawer__dialog' Selector for drawer dialog element.
selectorFocus '[data-focus]' Focus preference selector for when drawers are initially opened.
selectorInert null Applies inert and aria-hidden attributes to all matching elements when a modal drawer is opened.
selectorOverflow 'body' Applies overflow:hidden styles on all matching elements when a modal drawer is opened.
stateOpen 'is-opened' Class used for open state.
stateOpening 'is-opening' Class used for transitioning to open state.
stateClosing 'is-closing' Class used for transitioning to closed state.
stateClosed 'is-closed' Class used for closed state.
classModal 'drawer_modal' Class used for toggling the drawer modal state.
breakpoints null An object with key/value pairs defining a breakpoint set.
customEventPrefix 'drawer:' Prefix to be used on custom events.
eventListeners true Whether or not to set the document event listeners on init.
store true Toggles the local store feature.
storeKey 'VB:DrawerState' Defines the localStorage key where drawer states are saved.
setTabindex true Whether or not to set tabindex="-1" on all drawer dialog elements on init.
transition true Toggle the transition animation of drawers.


  • drawer:opened Emits when a drawer has opened.
  • drawer:closed Emits when a drawer has closed.
  • drawer:switchMode Emits when a drawer's mode changes.



Returns an array where all drawer objects are stored when registered. Each drawer object contains the following properties:

  id: String, // The unique ID of the drawer.
  state: String, // The current state of the drawer ('closing', 'closed', 'opening' or 'opened').
  el: HTMLElement, // The drawer HTML element.
  dialog: HTMLElement // The drawer dialog HTML element.
  trigger: HTMLElement // The trigger element that opened the drawer.
  settings: Object // The drawer specific settings.
  breakpoint: String // Returns the set breakpoint of the drawer. If no breakpoint is set, returns 'null'.
  mode: String // The current mode of the drawer. Either 'inline' or 'modal'.
  open: Function // Method to open this drawer.
  close: Function // Method to close this drawer.
  toggle: Function // Method to toggle this drawer opened and closed.
  deregister: Function // Method to deregister this drawer.
  mountBreakpoint: Function // Method to mount the breakpoint feature.
  unmountBreakpoint: Function // Method to unmount the breakpoint feature.
  handleBreakpoint: Function // The function that runs whenever the breakpoint media match property is changed. Receives the event parameter.
  getSetting: Function // Method that returns either a drawer specific setting or global drawer setting.


  • Array An array of collection entries.


Returns the currently active modal drawer. Returns undefined if there is no modal drawer open.


  • Object || undefined Collection entry.


Initializes the drawer instance. During initialization, the following processes are run:

  • Register each drawer in the collection by running registerCollection().
  • Sets up global event listeners by running initEventListeners().


  • options [Object] (optional) An options object for passing custom settings.
const drawer = new Drawer();
await drawer.init();


Destroys and cleans up the drawer initialization. During cleanup, the following processes are run:

  • Deregister the drawer collection by running deregisterCollection().
  • Removes global event listeners by running destroyEventListeners().
const drawer = new Drawer();
await drawer.init();
// ...
await drawer.destroy();


Set document event listeners.

const drawer = new Drawer({ eventListeners: false });
await drawer.init();


Remove document event listeners.

const drawer = new Drawer();
await drawer.init();
// ...


Registers a drawer into the collection. This also sets the initial state, mode, mounts any media match breakpoints and applies missing accessibility attributes.


  • query [String || Object] A drawer ID or an HTML element of either the drawer or its trigger.


  • Object The drawer object that got stored in the collection.
const result = await drawer.register('drawer-id');
// => Object { id: 'drawer-id', ... }


Deregister the drawer from the collection. This closes the drawer if it's opened, removes any active media match breakpoints and removes the entry from the collection.


  • query [String || Object] A drawer ID or an HTML element of either the drawer or its trigger.


  • Array Returns the newly modified collection array.
const result = await drawer.deregister('drawer-id');
// => Array [{}, {}, ...]


Registers array of drawers to the collection. All drawers in array are run through the register() method.


  • items [Array] An array of drawers or drawer IDs to register.


  • Array Returns the collection array.
const drawers = document.querySelectorAll('.drawer');
const result = await drawer.registerCollection(drawers);
// => Array [{}, {}, ...]


Deregister all drawers in the collections array. All drawers in collection are run through the deregister() method.


  • Array Returns the empty collection array.
const result = await drawer.registerCollection();
// => Array []

drawer.get(value, key)

Used to retrieve a registered drawer object from the collection. The value should match the key type to search by: e.g. to search by drawer elements, pass the drawer html node with a key of 'el'. Defaults to 'id'.


  • value [String || Object] The value to search for within the collection.
  • key [String] (optional) (default 'id') The property key to search the value against.


  • Object || undefined The first element in the collection that matches the provided query and key. Otherwise, undefined is returned.
const entry = drawer.get('drawer-id');
// => Object { id: 'drawer-id', ... }

drawer.open(id, transition, focus)

Opens a drawer using the provided ID.


  • id [String] The ID of the drawer to open.
  • transition [Boolean] (optional) Whether or not to animate the transition.
  • focus [Boolean] (optional) Whether or not to handle focus management.


  • Object The drawer object that was opened.
const entry = await drawer.open('drawer-key');
// => Object { id: 'drawer-id', ... }

drawer.close(id, transition, focus)

Closes a drawer using the provided ID.


  • id [String] (optional) The ID of the drawer to close.
  • transition [Boolean] (optional) Whether or not to animate the transition.
  • focus [Boolean] (optional) Whether or not to handle focus management.


  • Object The drawer object that was closed.
const entry = await drawer.close();
// => Object { id: 'drawer-id', ... }

drawer.toggle(id, transition, focus)

Toggles a drawer opened or closed using the provided ID.


  • id [String] (optional) The ID of the drawer to toggle.
  • transition [Boolean] (optional) Whether or not to animate the transition.
  • focus [Boolean] (optional) Whether or not to handle focus management.


  • Object The drawer object that was closed.
const entry = await drawer.toggle();
// => Object { id: 'drawer-id', ... }

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