Modal panel that slides in from the side of the page
Drawer elements go here...
Demo: The button opens a typical drawer


A drawer is a modal panel that slides in from the side of the page. A drawer is generally used to provide navigation in situations where: a) screen real estate is constrained and b) the navigation UI is not critical to completing the user’s primary goal (and, hence, not critical to the application’s business goal).

Drawer displays a ModalBackdrop behind the main overlay content to help the user understand the modal condition. Both the backdrop and the dialog itself can be styled.

Drawer is very similar to Dialog in construction, and provides the same level of keyboard support.

The user may dismiss the drawer by pressing Esc, or by swiping to the side with touch or the trackpad. You may also provide a UI element inside the drawer — e.g., a close box — that dismisses the drawer.

A common UI for opening a drawer is a button with a three line "hamburger" icon. Elix provides this combination in HamburgerMenuButton.


import Drawer from 'elix/src/Drawer.js';
const drawer = new Drawer(); // or
const drawer = document.createElement('elix-drawer');


<script type="module" src="node_modules/elix/src/Drawer.js"></script>
  <!-- Drawer contents go here -->

See also


Ancestry: Drawer → DialogOverlayReactiveElement → HTMLElement

Built with mixins AttributeMarshallingMixin, DialogModalityMixin, EffectMixin, KeyboardMixin, LanguageDirectionMixin, OpenCloseMixin, OverlayMixin, ReactiveMixin, ShadowTemplateMixin, SlotContentMixin, TouchSwipeMixin, TrackpadSwipeMixin, and TransitionEffectMixin.

By default, this uses these elements in the following roles:

This element is used to fill a role in HamburgerMenuButton.

$ property

A convenient shortcut for looking up an element by ID in the component's Shadow DOM subtree.

Example: if component's template contains a shadow element <button id="foo">, you can use the reference this.$.foo to obtain the corresponding button in the component instance's shadow tree. The $ function is simply a shorthand for getElementById, so this.$.foo is the same as this.shadowRoot.getElementById('foo').

Type: object

Defined by ShadowTemplateMixin

backdropRole property

The class, tag, or template used for the optional backdrop element behind the overlay.

This can help focus the user's attention on the overlay content. Additionally, a backdrop can be used to absorb clicks on background page elements. For example, Dialog uses ModalBackdrop as an overlay backdrop in such a way.

Type: (component class constructor)|HTMLTemplateElement|string

Default: Backdrop

Defined by Overlay

close(closeResult) method

Close the component (if not already closed).

Some components like AlertDialog want to indicate why or how they were closed. To support such scenarios, you can supply a value to the optional closeResult parameter. This closeResult will be made available in the whenClosed promise and the state.closeResult member.


  • closeResult: objectan indication of how or why the element closed

Defined by OpenCloseMixin

closed property

True if the element is currently closed.

Type: boolean

Defined by OpenCloseMixin

closed event

Raised when the component closes.

Defined by OpenCloseMixin

closeFinished property

True if the element has completely closed.

For components not using asynchronous open/close effects, this property returns the same value as the closed property. For elements that have a true value of state.openCloseEffects (e.g., elements using TransitionEffectMixin), this property returns true only if state.effect is "close" and state.effectPhase is "after".

Type: boolean

Defined by OpenCloseMixin

defaultState property

The default state for the component. This can be extended by mixins and classes to provide additional default state.

Type: State

Defined by ReactiveMixin

effect-phase-changed event

Raised when state.effect or state.effectPhase changes.

Note: In general, Elix components do not raise events in response to outside manipulation. (See symbols.raiseChangeEvents.) However, for a component using TransitionEffectMixin, a single invocation of the startEffect method will cause the element to pass through multiple visual states. This makes it hard for external hosts of this component to know what visual state the component is in. Accordingly, the mixin raises the effect-phase-changed event whenever the effect or phase changes, even if symbols.raiseChangeEvents is false.

Defined by TransitionEffectMixin

frameRole property

The class, tag, or template used to contain the primary overlay content.

The frame element can be used to provide a border around the overlay content, and to provide visual effects such as a drop-shadow to help distinguish overlay content from background page elements.

Type: (component class constructor)|HTMLTemplateElement|string

Default: OverlayFrame

Defined by Overlay

fromEdge property

The edge from which the drawer will appear, in terms of the drawer's container.

The start and end values refer to text direction: in left-to-right languages such as English, these are equivalent to left and right, respectively.

Type: 'end'|'left'|'right'|'start'

Default: 'start'

open() method

Open the element (if not already opened).

Defined by OpenCloseMixin

opened property

True if the element is currently opened.

Type: boolean

Defined by OpenCloseMixin

opened event

Raised when the component opens.

Defined by OpenCloseMixin

opened-changed event

Raised when the opened/closed state of the component changes.

Defined by OpenCloseMixin

render() method

Render pending component changes to the DOM.

This method does nothing if the state has not changed since the last render call.

This method invokes all internal render methods. It then invoked componentDidMount (for first render) or componentDidUpdate (for subsequent renders).

Defined by ReactiveMixin

setState(changes) method

Update the component's state by merging the specified changes on top of the existing state. If the component is connected to the document, and the new state has changed, this returns a promise to asynchronously render the component. Otherwise, this returns a resolved promise.


  • changes: objectthe changes to apply to the element's state

Returns: Promise - resolves when the new state has been rendered

Defined by ReactiveMixin

state property

The component's current state. The returned state object is immutable. To update it, invoke setState.

Type: State

Defined by ReactiveMixin

[symbols.contentSlot] property

Defined by SlotContentMixin

[symbols.elementsWithTransitions] property

Return the elements that use CSS transitions to provide visual effects.

By default, this assumes the host element itself will have a CSS transition applied to it, and so returns an array containing the element. If you will be applying CSS transitions to other elements, override this property and return an array containing the implicated elements.

See symbols.elementsWithTransitions for details.

Type: Array.

Defined by TransitionEffectMixin

[symbols.keydown]() method

See the symbols documentation for details.

Defined by KeyboardMixin

[symbols.render](changed) method

Internal method for rendering any recent changes in state to the DOM.

The default implementation of this method does nothing. Override this method in your component to update your component's host element and any shadow elements to reflect the component's new state. See the rendering example.

Be sure to call super in your method implementation so that your component's base classes and mixins have a chance to perform their own render work.


  • changed: objectdictionary of flags indicating which state members have changed since the last render

Defined by ReactiveMixin

[symbols.startEffect](effect) method


  • effect: string

Defined by TransitionEffectMixin

[symbols.swipeTarget] property

Type: HTMLElement

Defined by TouchSwipeMixin

toggle(opened) method

Toggle the open/close state of the element.


  • opened: booleantrue if the element should be opened, false if closed.

Defined by OpenCloseMixin

whenClosed() method

This method can be used as an alternative to listening to the "opened-changed" event, particularly in situations where you want to only handle the next time the component is closed.

Returns: Promise A promise that resolves when the element has completely closed, including the completion of any asynchronous opening effect.

Defined by OpenCloseMixin