包详细信息

Overview

An <sp-menu> is used for creating a menu list. The various elements inside a menu are given as <sp-menu-group>, <sp-menu-item>, or <sp-menu-divider>. Often a <sp-menu> element will appear in a <sp-popover> element so that it displays as a toggling menu.

Usage

yarn add @spectrum-web-components/menu

Import the side effectful registration of <sp-menu>, <sp-menu-group>, <sp-menu-item>, or <sp-menu-divider> individually as follows:

import '@spectrum-web-components/menu/sp-menu.js';
import '@spectrum-web-components/menu/sp-menu-group.js';
import '@spectrum-web-components/menu/sp-menu-item.js';
import '@spectrum-web-components/menu/sp-menu-divider.js';

When looking to leverage the Menu, MenuGroup, MenuItem, or MenuDivider base classes as a type and/or for extension purposes, do so via:

import {
    Menu,
    MenuGroup,
    MenuItem,
    MenuDivider
} from '@spectrum-web-components/menu';

Anatomy

<sp-menu label="Selection type">
    <sp-menu-item>
        Deselect
    </sp-menu-item>
    <sp-menu-item>
        Select inverse
    </sp-menu-item>
    <sp-menu-item>
        Feather...
    </sp-menu-item>
    <sp-menu-item>
        Select and mask...
    </sp-menu-item>
    <sp-menu-item>
        Save selection
    </sp-menu-item>
    <sp-menu-item disabled>
        Make work path
    </sp-menu-item>
</sp-menu>

Popover menus

Often an <sp-menu> element will be delivered inside of an <sp-popover> element when displaying it above other content.

<sp-popover open style="position: relative" label="Selection type">
    <sp-menu>
        <sp-menu-item value="item-1">Deselect</sp-menu-item>
        <sp-menu-item value="item-2">Select inverse</sp-menu-item>
        <sp-menu-item value="item-3">Feather...</sp-menu-item>
        <sp-menu-item value="item-4">Select and mask...</sp-menu-item>
        <sp-menu-item value="item-5">Save selection</sp-menu-item>
        <sp-menu-item value="item-6" disabled>Make work path</sp-menu-item>
    </sp-menu>
</sp-popover>

Labels

To render accessibly, an <sp-menu> element or its parent <sp-popover> must have a label. For an accessible label that is visibly hidden, but can still be read by assistive technology, use the label attribute.

<sp-tabs selected="sp-field-label" auto label="Label options">

<sp-tab value="sp-field-label">Menu with label</sp-tab>

```html demo

<sp-menu id="menu-label-attribute" label="Selection type"> <sp-menu-item>Deselect</sp-menu-item> <sp-menu-item>Select inverse</sp-menu-item> <sp-menu-item>Feather...</sp-menu-item> <sp-menu-item>Select and mask...</sp-menu-item> <sp-menu-divider></sp-menu-divider> <sp-menu-item>Save selection</sp-menu-item> <sp-menu-item disabled>Make work path</sp-menu-item> </sp-menu>

</sp-tab-panel>
<sp-tab value="label-attribute">Popover with label</sp-tab>
<sp-tab-panel value="label-attribute">

```html demo
<sp-popover open style="position: relative" label="Selection type:">
    <sp-menu id="popover-label-attribute">
        <sp-menu-item>Deselect</sp-menu-item>
        <sp-menu-item>Select inverse</sp-menu-item>
        <sp-menu-item>Feather...</sp-menu-item>
        <sp-menu-item>Select and mask...</sp-menu-item>
        <sp-menu-divider></sp-menu-divider>
        <sp-menu-item>Save selection</sp-menu-item>
        <sp-menu-item disabled>Make work path</sp-menu-item>
    </sp-menu>
</sp-popover>

</sp-tab-panel> </sp-tabs>

Options

Sizes

<sp-tabs selected="m" auto label="Size attribute options">

<sp-tab value="s">Small</sp-tab>

```html demo

<sp-menu id="menu-s" size="s" label="Selection type"> <sp-menu-item>Deselect</sp-menu-item> <sp-menu-item>Select inverse</sp-menu-item> <sp-menu-item>Feather...</sp-menu-item> <sp-menu-item>Select and mask...</sp-menu-item> <sp-menu-divider></sp-menu-divider> <sp-menu-item>Save selection</sp-menu-item> <sp-menu-item disabled>Make work path</sp-menu-item> </sp-menu>

<sp-popover open style="position: relative" label="Selection type:"> <sp-menu id="menu-s-popover" size="s"> <sp-menu-item>Deselect</sp-menu-item> <sp-menu-item>Select inverse</sp-menu-item> <sp-menu-item>Feather...</sp-menu-item> <sp-menu-item>Select and mask...</sp-menu-item> <sp-menu-divider></sp-menu-divider> <sp-menu-item>Save selection</sp-menu-item> <sp-menu-item disabled>Make work path</sp-menu-item> </sp-menu> </sp-popover>

</sp-tab-panel>
<sp-tab value="m">Medium</sp-tab>
<sp-tab-panel value="m">

```html demo
<sp-menu id="menu-m" size="m" label="Selection type">
    <sp-menu-item>Deselect</sp-menu-item>
    <sp-menu-item>Select inverse</sp-menu-item>
    <sp-menu-item>Feather...</sp-menu-item>
    <sp-menu-item>Select and mask...</sp-menu-item>
    <sp-menu-divider></sp-menu-divider>
    <sp-menu-item>Save selection</sp-menu-item>
    <sp-menu-item disabled>Make work path</sp-menu-item>
</sp-menu>
<sp-popover open style="position: relative" label="Selection type:">
    <sp-menu id="menu-m-popover" size="m">
        <sp-menu-item>Deselect</sp-menu-item>
        <sp-menu-item>Select inverse</sp-menu-item>
        <sp-menu-item>Feather...</sp-menu-item>
        <sp-menu-item>Select and mask...</sp-menu-item>
        <sp-menu-divider></sp-menu-divider>
        <sp-menu-item>Save selection</sp-menu-item>
        <sp-menu-item disabled>Make work path</sp-menu-item>
    </sp-menu>
</sp-popover>

</sp-tab-panel>

<sp-tab value="l">Large</sp-tab>

```html demo

<sp-menu id="menu-l" size="l" label="Selection type"> <sp-menu-item>Deselect</sp-menu-item> <sp-menu-item>Select inverse</sp-menu-item> <sp-menu-item>Feather...</sp-menu-item> <sp-menu-item>Select and mask...</sp-menu-item> <sp-menu-divider></sp-menu-divider> <sp-menu-item>Save selection</sp-menu-item> <sp-menu-item disabled>Make work path</sp-menu-item> </sp-menu>

<sp-popover open style="position: relative" label="Selection type:"> <sp-menu id="menu-l-popover" size="l"> <sp-menu-item>Deselect</sp-menu-item> <sp-menu-item>Select inverse</sp-menu-item> <sp-menu-item>Feather...</sp-menu-item> <sp-menu-item>Select and mask...</sp-menu-item> <sp-menu-divider></sp-menu-divider> <sp-menu-item>Save selection</sp-menu-item> <sp-menu-item disabled>Make work path</sp-menu-item> </sp-menu> </sp-popover>

</sp-tab-panel>
<sp-tab value="xl">Extra Large</sp-tab>
<sp-tab-panel value="xl">

```html demo
<sp-menu id="menu-xl" size="xl" label="Selection type">
    <sp-menu-item>Deselect</sp-menu-item>
    <sp-menu-item>Select inverse</sp-menu-item>
    <sp-menu-item>Feather...</sp-menu-item>
    <sp-menu-item>Select and mask...</sp-menu-item>
    <sp-menu-divider></sp-menu-divider>
    <sp-menu-item>Save selection</sp-menu-item>
    <sp-menu-item disabled>Make work path</sp-menu-item>
</sp-menu>
<sp-popover open style="position: relative" label="Selection type:">
    <sp-menu id="menu-xl-popover" size="xl">
        <sp-menu-item>Deselect</sp-menu-item>
        <sp-menu-item>Select inverse</sp-menu-item>
        <sp-menu-item>Feather...</sp-menu-item>
        <sp-menu-item>Select and mask...</sp-menu-item>
        <sp-menu-divider></sp-menu-divider>
        <sp-menu-item>Save selection</sp-menu-item>
        <sp-menu-item disabled>Make work path</sp-menu-item>
    </sp-menu>
</sp-popover>

</sp-tab-panel> </sp-tabs>

Selection

The <sp-menu> element can be instructed to maintain a selection via the selects attribute. Depending on the chosen algorithm, the <sp-menu> element will hold a value property and manage the selected state of its <sp-menu-item> descendants.

• When selects="single", the <sp-menu> element will maintain one selected item after an initial selection is made.
• When selects is set to multiple, the <sp-menu> element will maintain zero or more selected items.
• When selects is set to inherit, the <sp-menu> element will allow its <sp-menu-item> children to participate in the selection of its nearest <sp-menu> ancestor.

<sp-tabs selected="selects-single" auto label="Selects attribute">

<sp-tab value="selects-single">Single</sp-tab>

```html demo

The value of the <sp-menu> element is:

<sp-menu label="Choose a shape" selects="single" onchange="this.previousElementSibling.querySelector('#single-value').textContent=this.value" > <sp-menu-item value="item-1">Square</sp-menu-item> <sp-menu-item value="item-2" selected>Triangle</sp-menu-item> <sp-menu-item value="item-3">Parallelogram</sp-menu-item> <sp-menu-item value="item-4">Star</sp-menu-item> <sp-menu-item value="item-5">Hexagon</sp-menu-item> <sp-menu-item value="item-6" disabled>Circle</sp-menu-item> </sp-menu>

</sp-tab-panel>
<sp-tab value="selects-multiple">Multiple</sp-tab>
<sp-tab-panel value="selects-multiple">

```html demo
<p>
    The value of the `&lt;sp-menu&gt;` element is:
    <span id="multiple-value">item-3,item-4</span>
</p>
<sp-menu
    label="Choose some fruit"
    selects="multiple"
    onchange="this.previousElementSibling.querySelector('#multiple-value').textContent=this.value"
>
    <sp-menu-item value="item-1">Apple</sp-menu-item>
    <sp-menu-item value="item-2">Banana</sp-menu-item>
    <sp-menu-item value="item-3" selected>Goji berry</sp-menu-item>
    <sp-menu-item value="item-4" selected>Grapes</sp-menu-item>
    <sp-menu-item value="item-5" disabled>Kumquat</sp-menu-item>
    <sp-menu-item value="item-6">Orange</sp-menu-item>
</sp-menu>

</sp-tab-panel>

<sp-tab value="selects-inherit">Inherit</sp-tab>

```html demo

The value of the <sp-menu> element is: item-3 || item-4 || item-8 || item-11

<sp-menu label="Choose some groceries" selects="multiple" value-separator=" || " onchange="this.previousElementSibling.querySelector('#inherit-value').textContent=this.value" > <sp-menu label="Fruit" selects="inherit"> <sp-menu-item value="item-1">Apple</sp-menu-item> <sp-menu-item value="item-2">Banana</sp-menu-item> <sp-menu-item value="item-3" selected>Goji berry</sp-menu-item> <sp-menu-item value="item-4" selected>Grapes</sp-menu-item> <sp-menu-item value="item-5" disabled>Kumquat</sp-menu-item> <sp-menu-item value="item-6">Orange</sp-menu-item> </sp-menu> <sp-menu label="Vegetables" selects="inherit"> <sp-menu-item value="item-7">Carrot</sp-menu-item> <sp-menu-item value="item-8" selected>Garlic</sp-menu-item> <sp-menu-item value="item-9" disabled>Lettuce</sp-menu-item> <sp-menu-item value="item-10">Onion</sp-menu-item> <sp-menu-item value="item-11" selected>Potato</sp-menu-item> <sp-menu-item value="item-12">Tomato</sp-menu-item> </sp-menu> </sp-menu> ```

</sp-tab-panel> </sp-tabs>

Behaviors

"change" event

Regardless of whether or not <sp-menu> carries a selection, when one of the <sp-menu-item> children that it manages is activated, the <sp-menu> element will dispatch a change event. At dispatch time, even when a selection is not held due to the absence of the selects attribute, the value of the <sp-menu> will correspond to the <sp-menu-item> that was activated. When the selects attribute is present, this value will persist beyond the lifecycle of the change event. When selects="multiple", the values of multiple items will be comma separated, unless otherwise set via the value-separator attribute.

Note: The change event is only dispatched on a left mouse click or Enter/Space keypress. Right/Middle mouse clicks will not dispatch the change event.

Accessibility

Review the accessibility guidelines for the menu-item and menu-group descendants.

Include a label

A menu is required to have an accessible label.