import React from 'react';
import ReactDOM from 'react-dom';

class MyForm extends React.Component {
  constructor(props){
    super(props);
    this.state ={value: ''};

    this.handleSubmit = this.handleSubmit.bind(this);
    this.handleChange = this.handleChange.bind(this);
  }

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

  handleSubmit(event){
    console.log('Submitted: ' + this.state.value);
    event.preventDefault();
  }

  render(){
    return <form onSubmit={this.handleSubmit}>
        <label>Name: 
        <input type="text" value={this.state.value} onChange={this.handleChange} />
        </label>
        <input type="submit" value="Submit" />
    </form>
  }
}

ReactDOM.render(
  <div>
    <MyForm />
  </div>, 
  document.querySelector('#root'));