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HTML

              
                <div id="app"></app>
              
            
!

CSS

              
                html, body
  height: 100%
  
body
  background: #fff
  display: flex
  justify-content: center
  align-items: center
  font-family: Helvetica Neue

button
  padding: 15px
  background-color: #1db4ff
  margin: 5px
  border: 1px solid #222
  outline: none
  &.active
    background-color: #24b47a
              
            
!

JS

              
                class Radio extends React.Component {
  constructor(props) {
    super(props);
    this.state = {selected: false};
  }

  toggle() {
    const {onChange} = this.context.radioGroup;
    const selected = !this.state.selected;
    this.setState({selected});
    onChange(selected, this);
  }
  
  setSelected(selected) {
    this.setState({selected});
  }
  
  render() {
    let classname = this.state.selected ? 'active' : ''
    return (
      <button type="button" className={classname} onClick={this.toggle.bind(this)}>
        {this.state.selected ? 'yes' : 'no'}
      </button>
    );
  }
}

Radio.contextTypes = {
  radioGroup: React.PropTypes.object
};

class RadioGroup extends React.Component {
  constructor(props) {
    super(props);
    this.options = [];
  }

  getChildContext() {
    const {name} = this.props;
    return {radioGroup: {
      name,
      onChange: this.onChange.bind(this)
    }};
  }
  
  onChange(selected, child) {
    this.options.forEach(option => {
      if (option !== child) {
        option.setSelected(!selected);
      }
    });
  }
  
  render() {
    let children = React.Children.map(this.props.children, child => {
      return React.cloneElement(child, {
        ref: (component => {this.options.push(component);}) 
      });
    });
    return <div className="radio-group">{children}</div>;
  }
}

RadioGroup.childContextTypes = {
  radioGroup: React.PropTypes.object
};

class Application extends React.Component {
  render() {
    return (
      <RadioGroup name="test">
        <Radio value="1" />
        <Radio value="2" />
        <Radio value="3" />
      </RadioGroup>
    );
  }
}

/*
 * Render the above component into the div#app
 */
ReactDOM.render(<Application />, document.getElementById('app'));
              
            
!
999px

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