Eso es todo.

Para comenzar a desarrollar, consulta nuestra documentación para desarrolladores.

Activar la Google Maps JavaScript API

Para que puedas comenzar, te proporcionaremos orientación en la Google Developers Console a fin de que hagas primero algunas acciones:

  1. Crear o seleccionar un proyecto
  2. Activar la Google Maps JavaScript API y servicios relacionados
  3. Crear claves correspondientes
Continuar

Draggable directions

This example demonstrates the use of the DirectionsService object to fetch directions between draggable markers.

Read the documentation or view this example full screen.

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 4,
    center: {lat: -24.345, lng: 134.46}  // Australia.
  });

  var directionsService = new google.maps.DirectionsService;
  var directionsDisplay = new google.maps.DirectionsRenderer({
    draggable: true,
    map: map,
    panel: document.getElementById('right-panel')
  });

  directionsDisplay.addListener('directions_changed', function() {
    computeTotalDistance(directionsDisplay.getDirections());
  });

  displayRoute('Perth, WA', 'Sydney, NSW', directionsService,
      directionsDisplay);
}

function displayRoute(origin, destination, service, display) {
  service.route({
    origin: origin,
    destination: destination,
    waypoints: [{location: 'Adelaide, SA'}, {location: 'Broken Hill, NSW'}],
    travelMode: 'DRIVING',
    avoidTolls: true
  }, function(response, status) {
    if (status === 'OK') {
      display.setDirections(response);
    } else {
      alert('Could not display directions due to: ' + status);
    }
  });
}

function computeTotalDistance(result) {
  var total = 0;
  var myroute = result.routes[0];
  for (var i = 0; i < myroute.legs.length; i++) {
    total += myroute.legs[i].distance.value;
  }
  total = total / 1000;
  document.getElementById('total').innerHTML = total + ' km';
}
<div id="map"></div>
<div id="right-panel">
  <p>Total Distance: <span id="total"></span></p>
</div>
#right-panel {
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}

#right-panel select, #right-panel input {
  font-size: 15px;
}

#right-panel select {
  width: 100%;
}

#right-panel i {
  font-size: 12px;
}
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#map {
  height: 100%;
  float: left;
  width: 63%;
  height: 100%;
}
#right-panel {
  float: right;
  width: 34%;
  height: 100%;
}
.panel {
  height: 100%;
  overflow: auto;
}
 <!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>

Pruébalo

Desplázate a la esquina superior derecha del bloque de código para copiar el código o abrirlo en JSFiddle.

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Draggable directions</title>
    <style>
      #right-panel {
        font-family: 'Roboto','sans-serif';
        line-height: 30px;
        padding-left: 10px;
      }

      #right-panel select, #right-panel input {
        font-size: 15px;
      }

      #right-panel select {
        width: 100%;
      }

      #right-panel i {
        font-size: 12px;
      }
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
        float: left;
        width: 63%;
        height: 100%;
      }
      #right-panel {
        float: right;
        width: 34%;
        height: 100%;
      }
      .panel {
        height: 100%;
        overflow: auto;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <div id="right-panel">
      <p>Total Distance: <span id="total"></span></p>
    </div>
    <script>
      function initMap() {
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 4,
          center: {lat: -24.345, lng: 134.46}  // Australia.
        });

        var directionsService = new google.maps.DirectionsService;
        var directionsDisplay = new google.maps.DirectionsRenderer({
          draggable: true,
          map: map,
          panel: document.getElementById('right-panel')
        });

        directionsDisplay.addListener('directions_changed', function() {
          computeTotalDistance(directionsDisplay.getDirections());
        });

        displayRoute('Perth, WA', 'Sydney, NSW', directionsService,
            directionsDisplay);
      }

      function displayRoute(origin, destination, service, display) {
        service.route({
          origin: origin,
          destination: destination,
          waypoints: [{location: 'Adelaide, SA'}, {location: 'Broken Hill, NSW'}],
          travelMode: 'DRIVING',
          avoidTolls: true
        }, function(response, status) {
          if (status === 'OK') {
            display.setDirections(response);
          } else {
            alert('Could not display directions due to: ' + status);
          }
        });
      }

      function computeTotalDistance(result) {
        var total = 0;
        var myroute = result.routes[0];
        for (var i = 0; i < myroute.legs.length; i++) {
          total += myroute.legs[i].distance.value;
        }
        total = total / 1000;
        document.getElementById('total').innerHTML = total + ' km';
      }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
    </script>
  </body>
</html>

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Google Maps JavaScript API
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