@material/mwc-menu

<mwc-menu>

IMPORTANT: The Material Web Components are a work in progress and subject to major changes until 1.0 release.

Menus display a list of choices on temporary surfaces.

Material Design Guidelines: menus

Installation

npm install @material/mwc-menu

NOTE: The Material Web Components are distributed as ES2017 JavaScript Modules, and use the Custom Elements API. They are compatible with all modern browsers including Chrome, Firefox, Safari, Edge, and IE11, but an additional tooling step is required to resolve bare module specifiers, as well as transpilation and polyfills for IE11. See here for detailed instructions.

Example usage

Basic

Note, mwc-menu internally uses mwc-list, so its main slot has the same interface as the main slot of a mwc-list.

<div style="position: relative;">
  <mwc-button id="button" raised label="Open Menu"></mwc-button>
  <mwc-menu id="menu">
    <mwc-list-item>Item 0</mwc-list-item>
    <mwc-list-item>Item 1</mwc-list-item>
    <mwc-list-item>Item 2</mwc-list-item>
    <mwc-list-item>Item 3</mwc-list-item>
  </mwc-menu>
</div>

<script type="module">
  import '@material/mwc-menu';
  import '@material/mwc-list/mwc-list-item';

  // anchor must share a parent with menu that is `position: relative`
  menu.anchor = button;

  button.addEventListener('click', function (e) {
    menu.open = true;
    // alternatively you can use menu.show();
  });
</script>

Activatable

<div style="position: relative;">
  <mwc-button id="button" raised label="Open Menu"></mwc-button>
  <mwc-menu activatable id="menu">
    <mwc-list-item>Item 0</mwc-list-item>
    <mwc-list-item selected activated>Item 1</mwc-list-item>
    <mwc-list-item>Item 2</mwc-list-item>
    <mwc-list-item>Item 3</mwc-list-item>
  </mwc-menu>
</div>

Multi-selectable (activatable)

<div style="position: relative;">
  <mwc-button id="button" raised label="Open Menu"></mwc-button>
  <mwc-menu activatable multi id="menu">
    <mwc-list-item>Item 0</mwc-list-item>
    <mwc-list-item selected activated>Item 1</mwc-list-item>
    <mwc-list-item>Item 2</mwc-list-item>
    <mwc-list-item selected activated>Item 3</mwc-list-item>
  </mwc-menu>
</div>

Absolute

<!--
  Note: no position: relative; This will make x and y relative to whatever
  ancestor is position: relative;
-->
<div>
  <mwc-button id="button" raised label="Open Menu"></mwc-button>
  <mwc-menu absolute x="50" y="100" id="menu">
    <mwc-list-item>Item 0</mwc-list-item>
    <mwc-list-item>Item 1</mwc-list-item>
    <mwc-list-item>Item 2</mwc-list-item>
    <mwc-list-item>Item 3</mwc-list-item>
  </mwc-menu>
</div>
<!-- No anchor associated -->

Fixed

<div>
  <mwc-button id="button" raised label="Open Menu"></mwc-button>
  <mwc-menu fixed id="menu">
    <mwc-list-item>Item 0</mwc-list-item>
    <mwc-list-item>Item 1</mwc-list-item>
    <mwc-list-item>Item 2</mwc-list-item>
    <mwc-list-item>Item 3</mwc-list-item>
  </mwc-menu>
</div>
<script type="module">
  import '@material/mwc-menu';
  import '@material/mwc-list/mwc-list-item';

  menu.anchor = button;

  button.addEventListener('click', function (e) {
    menu.open = true;
    // alternatively you can use menu.show();
  });
</script>

Selection Groups

Adding a group to your mwc-list-items will associate them with other [mwc-list-item]s in the same group and make selection function similarly to a radio group.

<style>
  /* Hide the icon of unselected menu items that are in a group */
  #menu > [mwc-list-item][group]:not([selected]) [slot="graphic"] {
    display: none;
  }
</style>
<div style="position:relative;">
  <mwc-button id="button" raised label="Open Menu"></mwc-button>

  <mwc-menu multi id="menu">
    <mwc-list-item group="a" graphic="icon">
      <mwc-icon slot="graphic">check</mwc-icon>
      <span>Item 0</span>
    </mwc-list-item>
    <mwc-list-item group="a" graphic="icon" selected>
      <mwc-icon slot="graphic">check</mwc-icon>
      <span>Item 1</span>
    </mwc-list-item>
    <mwc-list-item group="a" graphic="icon">
      <mwc-icon slot="graphic">check</mwc-icon>
      <span>Item 2</span>
    </mwc-list-item>
    <li divider role="separator"></li>
    <mwc-list-item group="b" graphic="icon" selected>
      <mwc-icon slot="graphic">check</mwc-icon>
      <span>Item 3</span>
    </mwc-list-item>
    <mwc-list-item group="b" graphic="icon">
      <mwc-icon slot="graphic">check</mwc-icon>
      <span>Item 4</span>
    </mwc-list-item>
  </mwc-menu>
</div>

Styled

mwc-menu internally uses mwc-list, and all CSS custom properties exposed by mwc-list apply here as well.

<style>
  #menu {
    --mdc-menu-min-width: 200px;
    --mdc-menu-item-height: 30px;
    --mdc-theme-surface: aliceblue;

    /* inherits the styles of mwc-list internally */
    --mdc-theme-primary: blue;
    --mdc-list-vertical-padding: 0px;
    --mdc-list-side-padding: 30px;
  }
</style>
<div style="position: relative;">
  <mwc-button id="button" raised label="Open Menu"></mwc-button>
  <mwc-menu activatable multi id="menu">
    <mwc-list-item selected activated>Item 0</mwc-list-item>
    <mwc-list-item selected activated>Item 1</mwc-list-item>
    <mwc-list-item>Item 2</mwc-list-item>
    <mwc-list-item>Item 3</mwc-list-item>
  </mwc-menu>
</div>

API

Slots

Name	Description
default	Content to display in the menus internal <mwc-list> element.

mwc-menu internally uses mwc-list, so the default slot has the same interface as the default slot of mwc-list.

Properties/Attributes

Name	Type	Default	Description
open	boolean	false	Whether the menu should open and display.
anchor	HTMLElement|null	null	Determines from which element the floating menu should calculate sizing and position offsets. In the default case, both mwc-menu and the anchor should share a parent with position:relative. Changing anchor typically requires absolute or fixed.
corner	Corner*	"TOP_START"	Corner of the anchor from which the menu should position itself.
quick	boolean	false	Whether to skip the opening animation.
absolute	boolean	false	Makes the menu's position absolute which will be relative to whichever ancestor has position:relative. Setting x and y will modify the menu's left and top. Setting anchor will attempt to position the menu to the anchor.
fixed	boolean	false	Makes the menu's position fixed which will be relative to the window. Setting x and y will modify the menu's left and top. Setting anchor will attempt to position the menu to the anchor's immediate position before opening.
x	number|null	null	Sets horizontal position when absolute or fixed. When given an anchor, sets horizontal position relative to anchor at given corner. Requires y not to be null.
y	number|null	null	Sets vertical position when absolute or fixed. When given an anchor, sets vertical position relative to anchor at given corner. Requires x not to be null.
forceGroupSelection	boolean	false	Forces a menu group to have a selected item by preventing deselection of menu items in menu groups via user interaction.
defaultFocus	DefaultFocusState**	"LIST_ROOT"	Item to focus upon menu open.
fullwidth	boolean	false	Sets surface width to 100%.
wrapFocus	boolean	false	Proxies to mwc-list's wrapFocus property.
innerRole	`"menu"	"listbox"`	"menu"
multi	boolean	false	Proxies to mwc-list's multi property.
activatable	boolean	false	Proxies to mwc-list's activatable property.
items	ListItemBase[] (readonly)	[]	Proxies to mwc-list's items property.
index	MWCListIndex (readonly)***	-1	Proxies to mwc-list's index property.
selected	SelectedType (readonly)****	null	Proxies to mwc-list's selected property.

* Corner is equivalent to type "TOP_LEFT"|"TOP_RIGHT"|"BOTTOM_LEFT"|"BOTTOM_RIGHT"|"TOP_START"|"TOP_END" |"BOTTOM_START"|"BOTTOM_END"

** DefaultFocusState is equivalent to type "NONE"|"LIST_ROOT"|"FIRST_ITEM"|"LAST_ITEM"

*** MWCListIndex is equivalent to type number|Set<number>.

**** SelectedType is equivaalent to type ListItemBase|ListItemBase[]|null. ListItemBase is the base class of mwc-list-item of which both mwc-check-list-item and mwc-radio-list-item also inherit from.

Methods

Name	Description
show() => void	Sets open to false.
close() => void	Sets open to true.
select(index: MWCMenuIndex) => void	Selects the elements at the given index / indices.
layout(updateItems = true) => void	Resets tabindex on all items and will update items model if provided true. It may be required to call layout if selectability of an element is dynamically changed. e.g. [mwc-list-item] attribute is removed from a list item or noninteractive is dynamically set on a list item.

Events

Event Name	Target	Detail	Description
opened	mwc-menu-surface	none	Fired when opened.
closed	mwc-menu-surface	none	Fired when closed.
action	mwc-list	ActionDetail*	Fired when a selection has been made via click or keyboard aciton.
selected	mwc-list	SelectedDetail*	Fired when a selection has been made. index is the selected index (will be of type Set<number> if multi and number if single), and diff (of type IndexDiff**) represents the diff of added and removed indices from previous selection.

* See mwc-list's Events section for more details.

CSS Custom Properties

mwc-menu inherits from mwc-list, so all custom properties from mwc-list propagate through mwc-menu.

Name	Default	Description
--mdc-shape-medium	4px	Border radius of the dropdown.
--mdc-menu-item-height	48px	Height of single-line list-items in the menu.
--mdc-menu-min-width	auto	Menu min-width.
--mdc-menu-max-width	auto	Menu max-width.
--mdc-menu-z-index	8	Z-index of the popup menu surface.
--mdc-theme-surface	#fff	Color of the menu surface.

mwc-menu internally uses mwc-list, see the styling documentation for further details.

Additional references

• MDC Web menus