Place Autocomplete and Directions

by Lawrence Ross

HTML

<input type="text" id="orig_latitude" name="orig_latitude"  />
<input type="text" id="orig_longitude" name="orig_longitude"  />
<br>
<input type="text" id="dest_latitude" name="dest_latitude"  />
<input type="text" id="dest_longitude" name="dest_longitude"  />

<input id="origin-input" class="controls" type="text"
    placeholder="Enter an origin location">

<input id="destination-input" class="controls" type="text"
    placeholder="Enter a destination location">

<div id="mode-selector" class="controls">
  <input type="radio" name="type" id="changemode-walking" checked="checked">
  <label for="changemode-walking">Walking</label>

  <input type="radio" name="type" id="changemode-transit">
  <label for="changemode-transit">Transit</label>

  <input type="radio" name="type" id="changemode-driving">
  <label for="changemode-driving">Driving</label>
</div>

<div id="map"></div>
<!-- Replace the value of the key parameter with your own API key. -->
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=places&callback=initMap"
        async defer></script>

CSS

/* Always set the map height explicitly to define the size of the div
 * element that contains the map. */
#map {
  height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
.controls {
  margin-top: 10px;
  border: 1px solid transparent;
  border-radius: 2px 0 0 2px;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  height: 32px;
  outline: none;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

#origin-input,
#destination-input {
  background-color: #fff;
  font-family: Roboto;
  font-size: 15px;
  font-weight: 300;
  margin-left: 12px;
  padding: 0 11px 0 13px;
  text-overflow: ellipsis;
  width: 200px;
}

#origin-input:focus,
#destination-input:focus {
  border-color: #4d90fe;
}

#mode-selector {
  color: #fff;
  background-color: #4d90fe;
  margin-left: 12px;
  padding: 5px 11px 0px 11px;
}

#mode-selector label {
  font-family: Roboto;
  font-size: 13px;
  font-weight: 300;
}

JavaScript

// This example requires the Places library. Include the libraries=places
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places">

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    mapTypeControl: false,
    center: {lat: -33.8688, lng: 151.2195},
    zoom: 13
  });

  new AutocompleteDirectionsHandler(map);
}

 /**
  * @constructor
 */
function AutocompleteDirectionsHandler(map) {
  this.map = map;
  this.originPlaceId = null;
  this.destinationPlaceId = null;
  this.travelMode = 'WALKING';
  var originInput = document.getElementById('origin-input');
  var destinationInput = document.getElementById('destination-input');
  var modeSelector = document.getElementById('mode-selector');
  this.directionsService = new google.maps.DirectionsService;
  this.directionsDisplay = new google.maps.DirectionsRenderer;
  this.directionsDisplay.setMap(map);

  var originAutocomplete = new google.maps.places.Autocomplete(
      originInput /*, {placeIdOnly: true} */);
  var destinationAutocomplete = new google.maps.places.Autocomplete(
      destinationInput /*, {placeIdOnly: true} */);

  this.setupClickListener('changemode-walking', 'WALKING');
  this.setupClickListener('changemode-transit', 'TRANSIT');
  this.setupClickListener('changemode-driving', 'DRIVING');

  this.setupPlaceChangedListener(originAutocomplete, 'ORIG');
  this.setupPlaceChangedListener(destinationAutocomplete, 'DEST');

  this.map.controls[google.maps.ControlPosition.TOP_LEFT].push(originInput);
  this.map.controls[google.maps.ControlPosition.TOP_LEFT].push(destinationInput);
  this.map.controls[google.maps.ControlPosition.TOP_LEFT].push(modeSelector);
}

// Sets a listener on a radio button to change the filter type on Places
// Autocomplete.
AutocompleteDirectionsHandler.prototype.setupClickListener = function(id, mode) {
  var radioButton = document.getElementById(id);
 ...