“Jak używać, jeśli w setState” Kod odpowiedzi

Jak używać, jeśli w setState

// How to use if-else in react js / setState of react js

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      title: "",
      time: "",
      enabled: false
    };
  }
  onChange(e) {
     this.setState({[e.target.id]: e.target.value},
       () => {
         if (this.state.title && this.state.time) {
           this.setState({ enabled: true });
         } else {
           this.setState({ enabled: false });
         }
       }
     );
  }
  render() {
    return (
      <React.Fragment>
        <input
          type="text"
          id="time"
          name="time"
          onChange={this.onChange.bind(this)}
          value={this.state.time}
        />
        <input
          type="text"
          id="title"
          name="title"
          onChange={this.onChange.bind(this)}
          value={this.state.title}
        />
        <button disabled={!this.state.enabled}>Button</button>
      </React.Fragment>
    );
  }
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);