This shows the use of a simple model in a react form. Input and state changes are handled by a single method.

sample-react-model.js

import React from 'react';

export default class RegistrationForm extends React.Component {
	constructor(props) {
		super(props);

		this.state = {			
			model: {
				firstName: '',
				lastName: ''				
			}
		};

	}

	handleInputChange = (e) => {
		let model = this.state.model;

		model[e.target.name]  = e.target.value;

		this.setState({
			model: model
		});

	}

	render() {
        return <div>
                <input name="firstName" value={this.state.firstName} onChange={this.handleInputChange} />
                <input name="lastName" value={this.state.lastName} onChange={this.handleInputChange} />
            </div>;
    }

}