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Radio Ready

Radio Buttons are graphical interface elements that allow user to choose only one of a predefined set of mutually exclusive options.

Examples #

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<duet-radio checked label="Checked" value="test"></duet-radio>

// Select the above radio component
var radio = document.querySelector("duet-radio")

// Listen for change events in the radio
radio.addEventListener("duetChange", function (e) {
console.log("Change detected in radio", e.detail)
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<duet-radio label="Unchecked"></duet-radio>
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<duet-radio checked disabled label="Disabled"></duet-radio>
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<duet-radio value="test" name="foo">
<span slot="label">Label with <strong>HTML</strong></span>

Properties #

Property Attribute Description Type Default
accessibleActiveDescendant accessible-active-descendant Indicates the id of a related component’s visually focused element. string undefined
accessibleControls accessible-controls Use this prop to add an aria-controls attribute. Use the attribute to indicate the id of a component controlled by this component. string undefined
accessibleDescribedBy accessible-described-by Indicates the id of a component that describes the radio. string undefined
accessibleDescription accessible-description Aria description the button string undefined
accessibleDetails accessible-details Aria Details of the component string undefined
accessibleIndex accessible-index Control the tabindex of checkbox. In most cases this should never be used! It exists only for Duet’s internal needs. string undefined
accessibleLabelledBy accessible-labelled-by String of id's that indicate alternative labels elements string undefined
accessibleOwns accessible-owns Indicates the id of a component owned by the radio. string undefined
blockEvents block-events Stops the components from emitting events boolean false
checked checked Check state of the radio. boolean undefined
disabled disabled Makes the radio component disabled. This prevents users from being able to interact with the radio, and conveys its inactive state to assistive technologies. boolean false
identifier identifier Adds a unique identifier for the radio. string undefined
label label Label for the radio. string "label"
margin margin Controls the margin of the component. "auto" | "none" "auto"
name name Name of the radio. string undefined
required required Set whether the input is required or not. Please note that this is required for accessible inputs when the user is required to fill them. When using this property you need to also set “novalidate” attribute to your form element to prevent browser from displaying its own validation errors. boolean false
role role Defines a specific role attribute for the input. string undefined
theme theme Theme of the radio. "" | "default" | "turva" ""
value value The value of the radio input does not mean if it's checked or not, use the checked property for that. string undefined

Events #

Event Description Type
duetBlur Emitted when the checkbox loses focus. CustomEvent<{ originalEvent?: Event; checked: boolean; value: string; component: "duet-radio"; }>
duetChange Emitted when the checked property has changed. CustomEvent<{ originalEvent?: Event; checked: boolean; value: string; component: "duet-radio"; }>
duetFocus Emitted when the checkbox has focus. CustomEvent<{ originalEvent?: Event; checked: boolean; value: string; component: "duet-radio"; }>

Methods #

setFocus(options?: FocusOptions) => Promise<void> #

Sets focus on the specified duet-radio. Use this method instead of the global

Parameters #

Name Type Description
options FocusOptions

Returns #

Type: Promise<void>

Slots #

Slot Description
"label" Label content.

Usage #

This section includes guidelines for designers and developers about the usage of this component in different contexts.

When to use #

  • When the user should be able to choose just one option from a limited number of options.
  • When you have under 11 options to choose from.

When not to use #

  • For “accepting terms of service” and similar functionality. Use checkbox instead.
  • In forms to toggle something on or off. Use checkbox or toggle instead.
  • When you have more than 10 options to choose from. Consider using select instead if the use case allows it.

Accessibility #

This component has been validated to meet the WCAG 2.1 AA accessibility guidelines. You can find additional information regarding accessibility of this component below.


For integration, event and theming guidelines, please see Using Components. This documentation explains how to implement and use Duet’s components across different technologies like Angular, React or Vanilla JavaScript.

Integration guidelines


Follow these practical tutorials to learn how to build simple page layouts using Duet’s CSS Framework, Web Components and other features:


Building Layouts


Using CLI Tools


Creating Custom Patterns


Server Side Rendering


Sharing Prototypes


Usage With Markdown


If you experience any issues while using a component, please head over to the Support page for more guidelines and help.