Formulaire.js

import React from 'react';
class Formulaire extends React.Component {
    constructor(props) {
        super(props);
        this.state = { value: '' };

        this.handleChange = this.handleChange.bind(this);
        this.handleSubmit = this.handleSubmit.bind(this);
    }

    handleChange(event) {
        this.setState({ value: event.target.value });
    }

    handleSubmit(event) {
        alert('un nom est soumis' + this.state.value);
        event.preventDefault();
    }

    render() {
        return ( <form onSubmit={this.handleSubmit}>
            <label>
              Name:
              <input type="text" value={this.state.value} onChange={this.handleChange} />
            </label>
            <input type="submit" value="Submit" />
          </form>
        );
    }
}
export default Formulaire;