1class LoginControl extends React.Component {
2 constructor(props) {
3 super(props);
4 this.handleLoginClick = this.handleLoginClick.bind(this);
5 this.handleLogoutClick = this.handleLogoutClick.bind(this);
6 this.state = {isLoggedIn: false};
7 }
8
9 handleLoginClick() {
10 this.setState({isLoggedIn: true});
11 }
12
13 handleLogoutClick() {
14 this.setState({isLoggedIn: false});
15 }
16
17 render() {
18 const isLoggedIn = this.state.isLoggedIn;
19 let button;
20 if (isLoggedIn) { button = <LogoutButton onClick={this.handleLogoutClick} />; } else { button = <LoginButton onClick={this.handleLoginClick} />; }
21 return (
22 <div>
23 <Greeting isLoggedIn={isLoggedIn} /> {button} </div>
24 );
25 }
26}
27
28ReactDOM.render(
29 <LoginControl />,
30 document.getElementById('root')
31);