Menu Surface

The MDC Menu Surface component is a reusable surface that appears above the content of the
page and can be positioned adjacent to an element. Menu Surfaces require JavaScript to properly position
themselves when opening.

Design & API Documentation

• 
  Material Design guidelines: Menus
  


• 
  Demo
  

Installation

``
npm install @rsmdc/menu-surface
`

Usage

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`html


`css
@import "@rsmdc/menu-surface/mdc-menu-surface";
`

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`js
import {MDCMenuSurface} from '@rsmdc/menu-surface';

const menuSurface = new MDCMenuSurface(document.querySelector('.mdc-menu-surface'));
`

> See Importing the JS component for more information on how to import JavaScript.

Variants

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#### Anchored To Parent

The menu surface can be positioned to automatically anchor to a parent element when opened.

`html


`html


`html


`js
// ...
menuSurface.setFixedPosition(true);
`

#### Absolute Position

The menu surface can use absolute positioning when being displayed. This requires that the element containing the
menu(body if using hoistMenuToBody()) has the position: relative style.

`html


`js
// ...
menuSurface.hoistMenuToBody(); // Not required if the menu-surface is already positioned on the body.
menuSurface.setAbsolutePosition(100, 100);
`

Style Customization

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CSS Class | Description
--- | ---
mdc-menu-surface | Mandatory.
mdc-menu-surface--animating-open | Indicates the menu surface is currently animating open. This class is removed once the animation completes.
mdc-menu-surface--open | Indicates the menu surface is currently open, or is currently animating open.
mdc-menu-surface--animating-closed | Indicates the menu surface is currently animating closed. This class is removed once the animation completes.
mdc-menu-surface--anchor | Used to indicate which element the menu should be anchored to.
mdc-menu-surface--fixed | Used to indicate that the menu is using fixed positioning.

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Mixin | Description
--- | ---
mdc-menu-surface-ink-color($color) | Sets the color property of the mdc-menu-surface.
mdc-menu-surface-fill-color($color) | Sets the background-color property of the mdc-menu-surface.
mdc-menu-surface-corner-radius($radius) | Sets the border-radius property of the mdc-menu-surface.

MDCMenuSurface Properties and Methods

Property | Value Type | Description
--- | --- | ---
open | Boolean | Proxies to the foundation's isOpen/(open, close) methods.
quickOpen | Boolean | Proxies to the foundation's setQuickOpen() method.

Method Signature | Description
--- | ---
setAnchorCorner(Corner) => void | Proxies to the foundation's setAnchorCorner(Corner) method.
setAnchorMargin(AnchorMargin) => void | Proxies to the foundation's setAnchorMargin(AnchorMargin) method.
setFixedPosition(isFixed: boolean) => void | Adds the mdc-menu-surface--fixed class to the mdc-menu-surface element. Proxies to the foundation's setIsHoisted() and setFixedPosition() methods.
setAbsolutePosition(x: number, y: number) => void | Proxies to the foundation's setAbsolutePosition(x, y) method. Used to set the absolute x/y position of the menu on the page. Should only be used when the menu is hoisted to the body.
setMenuSurfaceAnchorElement(element: Element) => void | Changes the element used as an anchor for menu-surface positioning logic. Should be used with conjunction with hoistMenuToBody().
hoistMenuToBody() => void | Removes the menu-surface element from the DOM and appends it to the body element. Should be used to overcome overflow: hidden issues.
setIsHoisted() => void | Proxies to the foundation's setIsHoisted method.
getDefaultFoundation() => MDCMenuSurfaceFoundation | Returns the foundation.

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Event Name | Data | Description
--- | --- | ---
MDCMenuSurface:closed | none | Event emitted after the menu surface is closed.
MDCMenuSurface:opened | none | Event emitted after the menu surface is opened.

Usage Within Frameworks

If you are using a JavaScript framework, such as React or Angular, you can create a Menu Surface for your framework. Depending on your needs, you can use the _Simple Approach: Wrapping MDC Web Vanilla Components_, or the _Advanced Approach: Using Foundations and Adapters_. Please follow the instructions here.

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Method Signature | Description
--- | ---
addClass(className: string) => void | Adds a class to the root element.
removeClass(className: string) => void | Removes a class from the root element.
hasClass(className: string) => boolean | Returns a boolean indicating whether the root element has a given class.
hasAnchor: () => boolean | Returns whether the menu surface has an anchor for positioning.
notifyClose() => void | Dispatches an event notifying listeners that the menu surface has been closed.
notifyOpen() => void | Dispatches an event notifying listeners that the menu surface has been opened.
isElementInContainer(el: Element) => Boolean | Returns true if the el Element is inside the mdc-menu-surface container.
isRtl() => boolean | Returns boolean indicating whether the current environment is RTL.
setTransformOrigin(value: string) => void | Sets the transform origin for the menu surface element.
isFocused() => boolean | Returns a boolean value indicating whether the root element of the menu surface is focused.
saveFocus() => void | Stores the currently focused element on the document, for restoring with restoreFocus.
restoreFocus() => void | Restores the previously saved focus state, by making the previously focused element the active focus again.
isFirstElementFocused() => boolean | Returns a boolean value indicating if the first focusable element of the menu-surface is focused.
isLastElementFocused() => boolean | Returns a boolean value indicating if the last focusable element of the menu-surface is focused.
focusFirstElement() => void | Focuses the first focusable element of the menu-surface.
focusLastElement() => void | Focuses the last focusable element of the menu-surface.
getInnerDimensions() => {width: number, height: number} | Returns an object with the items container width and height.
getAnchorDimensions() => {width: number, height: number, top: number, right: number, bottom: number, left: number} | Returns an object with the dimensions and position of the anchor (same semantics as DOMRect).
getBodyDimensions() => {width: number, height: number} | Returns an object with width and height of the body, in pixels.
getWindowDimensions() => {width: number, height: number} | Returns an object with width and height of the viewport, in pixels.
getWindowScroll() => {x: number, y: number} | Returns an object with the amount the body has been scrolled on the x and y axis.
setPosition(position: {top: string, right: string, bottom: string, left: string}) => void | Sets the position of the menu surface element.
setMaxHeight(value: string) => void | Sets max-height style for the menu surface element.

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Method Signature | Description
--- | ---
setAnchorCorner(corder: Corner) => void | Sets the corner that the menu surface will be anchored to. See constants.js
setAnchorMargin(margin: AnchorMargin) => void | Sets the distance from the anchor point that the menu surface should be shown.
setIsHoisted(isHoisted: boolean) => void | Sets whether the menu surface has been hoisted to the body so that the offsets are calculated relative to the page and not the anchor.
setFixedPosition(isFixed: boolean) => void | Sets whether the menu surface is using fixed positioning.
setAbsolutePosition(x: number, y: numnber) => void | Sets the absolute x/y position of the menu. Should only be used when the menu is hoisted or using fixed positioning.
handleBodyClick(event: Event) => void | Method used as the callback function for the click event.
handleKeydown(event: Event) => void | Method used as the callback function for the keydown events.
open() => void | Opens the menu surface.
close() => void | Closes the menu.
isOpen() => boolean | Returns a boolean indicating whether the menu surface is open.
setQuickOpen(quickOpen: boolean) => void | Sets whether the menu surface should open and close without animation when the open/close` methods are called.