Waypoints in Directions

by daver182

HTML

<div id="map"></div>
<div id="right-panel">
<div>
<b>Start:</b>
<select id="start">
  <option value="Santiago, Chile">Santiago, Chile</option>
  <option value="Copiapó, Chile">Copiapó, Chile</option>
  <option value="Talca, Chile">Talca, Chile</option>
  <option value="Chañaral, Chile">Chañaral, Chile</option>
</select>
<br>
<b>Waypoints:</b> <br>
<i>(Ctrl+Click or Cmd+Click for multiple selection)</i> <br>
<select multiple id="waypoints">
  <option value="Arica, Chile">Arica, Chile</option>
  <option value="Santiago, Chile">Santiago, Chile</option>
  <option value="Copiapó, Chile">Copiapó, Chile</option>
  <option value="Talca, Chile">Talca, Chile</option>
  <option value="Chañaral, Chile">Chañaral, Chile</option>
</select>
<br>
<b>End:</b>
<select id="end">
  <option value="Arica, Chile">Arica, Chile</option>
  <option value="Santiago, Chile">Santiago, Chile</option>
  <option value="Copiapó, Chile">Copiapó, Chile</option>
  <option value="Talca, Chile">Talca, Chile</option>
  <option value="Chañaral, Chile">Chañaral, Chile</option>
</select>
<br>
  <input type="submit" id="submit">
</div>
<div id="directions-panel"></div>
</div>
<!-- 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>

CSS

#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: 70%;
  height: 100%;
}
#right-panel {
  margin: 20px;
  border-width: 2px;
  width: 20%;
  height: 400px;
  float: left;
  text-align: left;
  padding-top: 0;
}
#directions-panel {
  margin-top: 10px;
  background-color: #FFEE77;
  padding: 10px;
  overflow: scroll;
  height: 174px;
}

JavaScript

function initMap() {
  var directionsService = new google.maps.DirectionsService;
  var directionsDisplay = new google.maps.DirectionsRenderer;
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 6,
    center: {lat: 41.85, lng: -87.65}
  });
  directionsDisplay.setMap(map);

  document.getElementById('submit').addEventListener('click', function() {
    calculateAndDisplayRoute(directionsService, directionsDisplay);
  });
}

function calculateAndDisplayRoute(directionsService, directionsDisplay) {
  var waypts = [];
  var checkboxArray = document.getElementById('waypoints');
  for (var i = 0; i < checkboxArray.length; i++) {
    if (checkboxArray.options[i].selected) {
      waypts.push({
        location: checkboxArray[i].value,
        stopover: true
      });
    }
  }

  directionsService.route({
    origin: document.getElementById('start').value,
    destination: document.getElementById('end').value,
    waypoints: waypts,
    optimizeWaypoints: true,
    travelMode: 'DRIVING'
  }, function(response, status) {
    if (status === 'OK') {
      directionsDisplay.setDirections(response);
      var route = response.routes[0];
      var summaryPanel = document.getElementById('directions-panel');
      summaryPanel.innerHTML = '';
      // For each route, display summary information.
      for (var i = 0; i < route.legs.length; i++) {
        var routeSegment = i + 1;
        summaryPanel.innerHTML += '<b>Route Segment: ' + routeSegment +
            '</b><br>';
        summaryPanel.innerHTML += route.legs[i].start_address + ' to ';
        summaryPanel.innerHTML += route.legs[i].end_address + '<br>';
        summaryPanel.innerHTML += route.legs[i].distance.text + '<br><br>';
      }
    } else {
      window.alert('Directions request failed due to ' + status);
    }
  });
}