1class NameForm extends React.Component {
2  constructor(props) {
3    super(props);
4    this.state = {value: ''};
5    this.handleChange = this.handleChange.bind(this);
6    this.handleSubmit = this.handleSubmit.bind(this);
7  }
8
9  handleChange(event) {    this.setState({value: event.target.value});  }
10  handleSubmit(event) {
11    alert('A name was submitted: ' + this.state.value);
12    event.preventDefault();
13  }
14
15  render() {
16    return (
17      <form onSubmit={this.handleSubmit}>
18        <label>
19          Name:
20          <input type="text" value={this.state.value} onChange={this.handleChange} />        </label>
21        <input type="submit" value="Submit" />
22      </form>
23    );
24  }
25}

1class NameForm extends React.Component {
2  constructor(props) {
3    super(props);
4    this.state = {value: ''};
5
6    this.handleChange = this.handleChange.bind(this);
7  }
8
9  handleChange(event) {
10    this.setState({value: event.target.value});
11  }
12
13  render() {
14    return (
15      <form>
16        <label>
17          Name:
18          <input type="text" value={this.state.value} onChange={this.handleChange} />
19        </label>
20        <input type="submit" value="Submit" />
21      </form>
22    );
23  }
24}