Codecrawl

See the Pen React Radio Buttons by Nick Van Dyck (@nickvdyck) on CodePen.

const RadioGroup = ({ name, value, children, onChange, ...rest }) => {
  const checked = typeof onChange === "function" ? "checked" : "defaultChecked";
  return (
    <div onChange={onChange}>
      {children.map(child =>
        React.cloneElement(child, {
          [checked]: child.props.value === value,
          name,
          ...rest
        })
      )}
    </div>
  );
};

const RadioButton = ({ label, value, className, ...rest }) => (
  <label className={className}>
    <input type="radio" value={value} {...rest} />
    {label}
  </label>
);

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      selected: "",
      fruits: ["Grape", "Apple"]
    };

    this.resetSelection = this.resetSelection.bind(this);
    this.changeFruit = this.changeFruit.bind(this);
    this.showSelected = this.showSelected.bind(this);
  }

  showSelected() {
    alert(`Current selection: ${this.state.selected || "none"}`);
  }

  changeFruit(event) {
    this.setState({ selected: event.target.value });
  }

  resetSelection() {
    this.setState({ selected: "" });
  }

  render() {
    return (
      <div>
        <RadioGroup
          name="fruit"
          onChange={this.changeFruit}
          value={this.state.selected}
        >
          {this.state.fruits.map(fruit => (
            <RadioButton value={fruit.toLowerCase()} label={fruit} />
          ))}
        </RadioGroup>
        <br />
        <button onClick={this.resetSelection}>Reset Selection</button>
        <button onClick={this.showSelected}> Show Selected </button>
      </div>
    );
  }
}

ReactDOM.render(<App />, document.getElementById("app"));

See the Pen React Radio Button Component by Sandy Gifford (@SandoCalrissian) on CodePen.

interface IRadioButtonsProps {
	buttons: string[];
	selected?: string;
	onChange?: (value: string) => void;
}
interface IRadioButtonsState { }

class RadioButtons extends React.Component<IRadioButtonsProps, IRadioButtonsState> {
	private static count = 0;
	private id: number;
	private groupName: string;

	constructor(props: IRadioButtonsProps) {
		super(props);

		this.id = RadioButtons.count;
		RadioButtons.count++;

		this.groupName = `RadioButtons__${this.id}`;
	}

	public render(): React.ReactElement<any> {
		return (
			<div className="RadioButtons">
				{this.props.buttons.map((value, index) => {
					const inputID = `${this.groupName}__${index}`;
					return (
						<div key={index} className="RadioButtons__group">
							<input
								className="RadioButtons__group__input"
								type="radio"
								name={this.groupName}
								id={inputID}
								checked={this.props.selected === value}
								onChange={() => this.props.onChange(value)} />
							<label
								className="RadioButtons__group__label"
								htmlFor={inputID}>{value}</label>
						</div>
					);
				})}
			</div>
		);
	}
};

interface IAppProps { }
interface IAppState {
	selected: string;
}

class App extends React.Component<IAppProps, IAppState> {
	constructor(props: IAppProps) {
		super(props);

		this.state = {
			selected: "Option 1",
		};
	}

	public render(): React.ReactElement<any> {
		return (
			<div className="App">
				<RadioButtons
					buttons={["Option 1", "Option 2", "Option 3"]}
					selected={this.state.selected}
					onChange={(value) => {
						this.setState({
							selected: value,
						});
					}} />
			</div>
		);
	}
};

ReactDOM.render(<App />, document.getElementById("ReactWrapper"));