form.js

class Form extends React.Component {
  
  constructor() {
    super()
    this.state = {
      name: null
    }
  }
  
  componentWillReceiveProps(nextProps) {
    if (nextProps.initialData && !this.props.initialData) {
      this.setState(this.nextProps.initialData)
    }
  }
  
  render() {
    
    return (
      <div>
        <input 
          onChange={e => this.setState({ name: e.target.value })} 
          value={this.state.name}
        />
      </div>
    )
  }
}