0.44.1 • Published 5 years ago

@shortcm/menu v0.44.1

Weekly downloads
1
License
MIT
Repository
github
Last release
5 years ago

Menus

A menu displays a list of choices on a temporary surface. They appear when users interact with a button, action, or other control.

Design & API Documentation

Installation

npm install @material/menu

Basic Usage

HTML Structure

<div class="mdc-menu mdc-menu-surface" tabindex="-1">
  <ul class="mdc-list" role="menu" aria-hidden="true" aria-orientation="vertical">
    <li class="mdc-list-item" role="menuitem">
      <span class="mdc-list-item__text">A Menu Item</span>
    </li>
    <li class="mdc-list-item" role="menuitem">
      <span class="mdc-list-item__text">Another Menu Item</span>
    </li>
  </ul>
</div>

Styles

@import "@material/list/mdc-list";
@import "@material/menu-surface/mdc-menu-surface";
@import "@material/menu/mdc-menu";

JavaScript Instantiation

import {MDCMenu} from '@material/menu';

const menu = new MDCMenu(document.querySelector('.mdc-menu'));
menu.open = true;

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

Variants

Selection Group Menu

Menus can contain a group of list items that can represent the selection state of elements within the group.

<div class="mdc-menu mdc-menu-surface" tabindex="-1" id="demo-menu">
  <ul class="mdc-list" role="menu" aria-hidden="true" aria-orientation="vertical">
    <li>
      <ul class="mdc-menu__selection-group">
        <li class="mdc-list-item" role="menuitem">
          <span class="mdc-list-item__graphic mdc-menu__selection-group-icon">
            ...
          </span>
          <span class="mdc-list-item__text">Single</span>
        </li>
        <li class="mdc-list-item" role="menuitem">
          <span class="mdc-list-item__graphic mdc-menu__selection-group-icon">
           ...
          </span>
          <span class="mdc-list-item__text">1.15</span>
        </li>
      </ul>
    </li>
    <li class="mdc-list-divider" role="separator"></li>
    <li class="mdc-list-item" role="menuitem">
      <span class="mdc-list-item__text">Add space before paragraph</span>
    </li>
    ...
  </ul>
</div>

Disabled Menu Items

Menu items can be disabled by adding the mdc-list-item--disabled modifier class (from MDC List). Disabled menu items will be excluded from keyboard navigation.

Anchors and Positioning

Anchored To Parent

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

<div id="toolbar" class="toolbar mdc-menu-surface--anchor">
  <div class="mdc-menu mdc-menu-surface">
  ...
  </div>
</div>

Anchor To Element Within Wrapper

The menu can be positioned to automatically anchor to another element, by wrapping the other element with the anchor class.

<div id="demo-menu" class="mdc-menu-surface--anchor">
  <button id="menu-button">Open Menu</button>
  <div class="mdc-menu mdc-menu-surface">
  ...
  </div>
</div>

Fixed Position

The menu can use fixed positioning when being displayed.

<div class="mdc-menu mdc-menu-surface">
...
</div>
// ...
menu.setFixedPosition(true);

Absolute Position

The menu can use absolutely positioned when being displayed.

<div class="mdc-menu mdc-menu-surface">
...
</div>
// ...
menu.hoistMenuToBody(); // Not required if the menu is already positioned on the body.
menu.setAbsolutePosition(100, 100);

Style Customization

CSS Classes

CSS ClassDescription
mdc-menuRequired on the root element
mdc-menu-surfaceRequired on the root element. See mdc-menu-surface documentation for other mdc-menu-surface classes.
mdc-listRequired on the nested ul element. See mdc-list documentation for other mdc-list classes.
mdc-menu__selection-groupUsed to wrap a group of mdc-list-item elements that will represent a selection group.
mdc-menu__selection-group-iconRequired when using a selection group to indicate which item is selected. Should contain an icon or svg that indicates the selected state of the list item.
mdc-menu-item--selectedUsed to indicate which element in a selection group is selected.

Sass Mixins

MixinDescription
mdc-menu-width($width)Used to set the width of the menu. When used without units (e.g. 4 or 5) it computes the width by multiplying by the base width (56px). When used with units (e.g. 240px, 15%, or calc(200px + 10px) it sets the width to the exact value provided.

See Menu Surface and List documentation for additional style customization options.

MDCMenu Properties and Methods

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

PropertyValue TypeDescription
openBooleanProxies to the menu surface's open property.
itemsArrayProxies to the list to query for all .mdc-list-item elements.
quickOpenBooleanProxies to the menu surface quickOpen property.
wrapFocusBooleanProxies to list's wrapFocus property.
Method SignatureDescription
setAnchorCorner(Corner) => voidProxies to the menu surface's setAnchorCorner(Corner) method.
setAnchorMargin(Partial<MDCMenuDistance>) => voidProxies to the menu surface's setAnchorMargin(Partial<MDCMenuDistance>) method.
setAbsolutePosition(x: number, y: number) => voidProxies to the menu surface's setAbsolutePosition(x: number, y: number) method.
setFixedPosition(isFixed: boolean) => voidProxies to the menu surface's setFixedPosition(isFixed: boolean) method.
hoistMenuToBody() => voidProxies to the menu surface's hoistMenuToBody() method.
setIsHoisted(isHoisted: boolean) => voidProxies to the menu surface's setIsHoisted(isHoisted: boolean) method.
setAnchorElement(element: Element) => voidProxies to the menu surface's setAnchorElement(element) method.
getOptionByIndex(index: number) => Element \| nullReturns the list item at the index specified.
getDefaultFoundation() => MDCMenuFoundationReturns the foundation.

See Menu Surface and List documentation for more information on proxied methods and properties.

Usage within Web Frameworks

If you are using a JavaScript framework, such as React or Angular, you can create a Menu 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.

MDCMenuAdapter

Method SignatureDescription
addClassToElementAtIndex(index: number, className: string) => voidAdds the className class to the element at the index specified.
removeClassFromElementAtIndex(index: number, className: string) => voidRemoves the className class from the element at the index specified.
addAttributeToElementAtIndex(index: number, attr: string, value: string) => voidAdds the attr attribute with value value to the element at the index specified.
removeAttributeFromElementAtIndex(index: number, attr: string) => voidRemoves the attr attribute from the element at the index specified.
elementContainsClass(element: Element, className: string) => booleanReturns true if the element contains the className class.
closeSurface() => voidCloses the menu surface.
getElementIndex(element: Element) => numberReturns the index value of the element.
getParentElement(element: Element) => Element \| nullReturns the .parentElement element of the element provided.
getSelectedElementIndex(element: Element) => numberReturns the index value of the element within the selection group provided, element that contains the mdc-menu-item--selected class.
notifySelected(index: number) => voidEmits a MDCMenu:selected event for the element at the index specified.

MDCMenuFoundation

Method SignatureDescription
handleKeydown(evt: Event) => voidEvent handler for the keydown events within the menu.
handleItemAction(listItem: Element) => voidEvent handler for list's action event.

Events

Event NameDataDescription
MDCMenu:selected{detail: {item: Element, index: number}}Used to indicate when an element has been selected. This event also includes the item selected and the list index of that item.