class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = { inpVal: "" };
    this.inputRef = React.createRef();
  }
  handleSubmit = (e) => {
    e.preventDefault();
    this.setState({ inpVal: this.inputRef.current.value });
  };
 
  render() {
    return (
      <form>
        <h1>{this.state.inpVal}</h1>
        <TextInput ref={this.inputRef} />
        <button type="submit">Submit</button>
      </form>
    );
  }
}
 
export default App;