sp-radio-group

NPM 1.4.0

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Overview API

Overview

<sp-radio> and <sp-radio-group> allow users to select a single option from a list of mutually exclusive options. All possible options are exposed up front for users to compare.

Usage

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yarn add @spectrum-web-components/radio

Import the side effectful registration of <sp-radio> or <sp-radio-group> via:

import '@spectrum-web-components/radio/sp-radio.js';
import '@spectrum-web-components/radio/sp-radio-group.js';

When looking to leverage the Radio or RadioGroup base classes as a type and/or for extension purposes, do so via:

import { Radio, RadioGroup } from '@spectrum-web-components/radio';

Anatomy

<sp-radio-group> holds a list of <sp-radio> elements, and is responsible for deselecting radio buttons when a new one is selected, which in turn makes it responsible for keeping track of which one is selected. <sp-radio> is responsible for handling user interactions and for visually reflecting if it is the one that is checked or not.

<sp-radio-group label="Choose an option" name="anatomy">
    <sp-radio value="first">Option 1</sp-radio>
    <sp-radio value="second">Option 2</sp-radio>
    <sp-radio value="third">Option 3</sp-radio>
    <sp-radio value="fourth">Option 4</sp-radio>
</sp-radio-group>

Label

The <sp-radio-group> element can be labeled with the label attribute or with an <sp-field-label> element:

`label` attribute Using a field label

Help Text

Help text can be accessibly associated with an <sp-radio-group> element by using the help-text or negative-help-text slots. When using the negative-help-text slot, <sp-radio-group> will self manage the presence of this content based on the value of the invalid property on your <sp-radio-group> element. Content within the help-text slot will be show by default. When your <sp-radio-group> should receive help text based on state outside of the complexity of invalid or not, manage the content addressed to the help-text from above to ensure that it displays the right messaging and possesses the right variant.

Read more about using help text.

Self managed 
<sp-field-label for="self">
    What is your favorite ice cream flavor?
</sp-field-label>
<sp-radio-group
    id="self"
    onchange="
        this.invalid = this.selected === 'fourth';
    "
>
    <sp-radio value="first">Vanilla</sp-radio>
    <sp-radio value="second">Chocolate</sp-radio>
    <sp-radio value="third">Strawberry</sp-radio>
    <sp-radio value="fourth">I don't like ice cream</sp-radio>
    <sp-help-text slot="help-text">Everyone likes ice cream.</sp-help-text>
    <sp-help-text slot="negative-help-text" icon>
        You can't not like ice cream.
    </sp-help-text>
</sp-radio-group>
 Managed from above

States

Standard radio buttons are the default style for radio buttons. They are optimal for application panels where all visual elements are monochrome in order to direct focus to the content.

Emphasized radio buttons are a secondary style for radio buttons. The blue color provides a visual prominence that is optimal for forms, settings, etc. where the radio buttons need to be noticed.

Default 
<div style="display: flex; justify-content: space-between;">
    <div style="display: flex; flex-direction: column;">
        <sp-field-label for="example-1" size="l">
            <h5 class="spectrum-Heading--subtitle1">Standard</h5>
        </sp-field-label>
        <sp-radio-group id="example-1" name="example" vertical>
            <sp-radio value="kittens">Kittens</sp-radio>
            <sp-radio value="puppies" checked>Puppies</sp-radio>
        </sp-radio-group>
    </div>

    <div style="display: flex; flex-direction: column;">
        <sp-field-label for="example-a" size="l">
            <h5 class="spectrum-Heading--subtitle1">Emphasized</h5>
        </sp-field-label>
        <sp-radio-group id="example-a" name="example" vertical>
            <sp-radio emphasized value="kittens">Kittens</sp-radio>
            <sp-radio emphasized value="puppies" checked>Puppies</sp-radio>
        </sp-radio-group>
    </div>
</div>
 Invalid Disabled

Behaviors

Handling events

Event handlers for changes can be registered on an <sp-radio-group> element.

<sp-radio-group
    label="Choose an option"
    name="onchange"
    onchange="spAlert(this, '<sp-radio-group> changes!')"
>
    <sp-radio value="first">Option 1</sp-radio>
    <sp-radio value="second" checked>Option 2</sp-radio>
    <sp-radio value="third">Option 3</sp-radio>
    <sp-radio value="fourth">Option 4</sp-radio>
</sp-radio-group>

Accessibility

Tabbing into a group of radio buttons places the focus on the first radio button selected. If none of the radio buttons are selected, the focus is set on the first one in the group. Space selects the radio button in focus (if not already selected). Using the arrow keys moves focus and selection to the previous or next radio button in the group (last becomes first, and first becomes last). The new radio button in focus gets selected even if the previous one was not.

Provide a label

Radio groups and radio items should always have labels.

Provide help text in the correct location

Radio groups should use help text for error messaging and descriptions. Descriptions are valuable for giving context behind why a selection is required, or for clarifying the options.

It is not currently possible to provide accessible ARIA references between elements in different shadow roots. To ensure proper association between elements, help text must be included via the slot="help-text" or slot="help-text-negative".

See help text for more information.