react-text-input.js

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

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

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

  render() {
    return (
      <input type="text" value={this.state.value} onChange={this.handleChange} />
    )
  }
}

window.TextInput = TextInput