@shortcm/radio

Radio Buttons

Radio buttons allow the user to select one option from a set while seeing all available options.

Design & API Documentation

• Material Design guidelines: Selection Controls – Radio buttons
• Demo

Installation

npm install @material/radio

Basic Usage

We recommend using MDC Radio with MDC Form Field for enhancements such as label alignment, label activation of the ripple interaction effect, and RTL-awareness.

HTML Structure

<div class="mdc-form-field">
  <div class="mdc-radio">
    <input class="mdc-radio__native-control" type="radio" id="radio-1" name="radios" checked>
    <div class="mdc-radio__background">
      <div class="mdc-radio__outer-circle"></div>
      <div class="mdc-radio__inner-circle"></div>
    </div>
  </div>
  <label for="radio-1">Radio 1</label>
</div>

Styles

@import "@material/form-field/mdc-form-field";
@import "@material/radio/mdc-radio";

JavaScript Instantiation

The radio button will work without JavaScript, but you can enhance it with a ripple interaction effect by instantiating MDCRadio on the mdc-radio element. To activate the ripple effect upon interacting with the label, you must also instantiate MDCFormField on the mdc-form-field element and set the MDCRadio instance as its input.

import {MDCFormField} from '@material/form-field';
import {MDCRadio} from '@material/radio';

const radio = new MDCRadio(document.querySelector('.mdc-radio'));
const formField = new MDCFormField(document.querySelector('.mdc-form-field'));
formField.input = radio;

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

Variants

Disabled

To disable a radio button, add the mdc-radio--disabled class to the root element and set the disabled attribute on the <input> element. Disabled radio buttons cannot be interacted with and have no visual interaction effect.

<div class="mdc-form-field">
  <div class="mdc-radio mdc-radio--disabled">
    <input class="mdc-radio__native-control" type="radio" id="radio-1" name="radios" disabled>
    <div class="mdc-radio__background">
      <div class="mdc-radio__outer-circle"></div>
      <div class="mdc-radio__inner-circle"></div>
    </div>
  </div>
  <label for="radio-1">Radio 1</label>
</div>

Style Customization

MDC Radio uses MDC Theme's secondary color by default. Use the following mixins to customize it.

Sass Mixins

Mixin	Description
mdc-radio-unchecked-stroke-color($color)	Sets the stroke color of an unchecked radio button
mdc-radio-checked-stroke-color($color)	Sets the stroke color of a checked radio button
mdc-radio-ink-color($color)	Sets the ink color of a radio button
mdc-radio-focus-indicator-color($color)	Sets the color of the focus indicator

Caveat: Edge and CSS Custom Properties

In browsers that fully support CSS custom properties, the above mixins will work if you pass in a MDC Theme property (e.g. primary) as an argument. However, Edge does not fully support CSS custom properties. If you are using any of the Sass mixins, you must pass in an actual color value for support in Edge.

MDCRadio Properties and Methods

Property	Value Type	Description
checked	Boolean	Setter/getter for the radio's checked state
disabled	Boolean	Setter/getter for the radio's disabled state. Setter proxies to foundation's setDisabled method
value	String	Setter/getter for the radio's value

Usage within Web Frameworks

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

MDCRadioAdapter

Method Signature	Description
setNativeControlDisabled(disabled: boolean) => void	Sets the input's disabled property to the given value
addClass(className: string) => void	Adds a class to the root element
removeClass(className: string) => void	Removes a class from the root element

MDCRadioFoundation

Method Signature	Description
setDisabled(disabled: boolean) => void	Sets the disabled value of the native control