Utiliser Google Maps pour calculer un itinéraire entre deux adresses

itineraire_gmaps.js

/*
Pré-requis : charger la librairie Google Maps :
<script src="https://maps.googleapis.com/maps/api/js?key=...&sensor=false"></script>
*/

// Adresses
var origin = '191 rue Saint-Jacques, Paris';
var destination = '37 bd Romain Rolland, Montrouge';

// Itinéraire
var directionsService = new google.maps.DirectionsService();
directionsService.route({origin:origin, destination:destination, travelMode:google.maps.TravelMode.DRIVING}, function(result, status){
    if(status == google.maps.DirectionsStatus.OK)
    {
        console.log(result);
    }
});