class MyFormComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = { firstName: '', lastName: '' };
  }

  handleChange(event) {
    this.setState({ [event.target.name]: event.target.value });
  }

  handleSubmit(event) {
    alert('submitted');
  }

  render() {
    return (
      <form onSubmit={this.handleSubmit.bind(this)}>
        <label>First name</label>
        <input type="text" name="firstName" value={this.state.firstName} onChange={this.handleChange.bind(this)}/>
        <label>Last name</label>
        <input type="text" name="lastName" value={this.state.lastName} onChange={this.handleChange.bind(this)}/>
        <input type="submit" value="Submit" />
      </form>
    );
  }
}