coopernet Réussir son site web et ses applications de la conception à la réalisation

Example:
Add an event handler in the onChange attribute, and let the event handler update the state object:

class MyForm extends React.Component {
constructor(props) {
super(props);
this.state = { username: ' ' };
}
myChangeHandler = (event) => {
this.setState({username: event.target.value});
}
render() {
return (
<form>
<h1>Hello {this.state.username}</h1>
<p>Enter your name:</p>
<input
type='text'
onChange={this.myChangeHandler}
/>
</form>
);
}
}

ReactDOM.render(<MyForm />, document.getElementById('root'));