以上で完了です。

開発を始めるには、デベロッパー ドキュメント をご覧下さい。

Google Maps JavaScript API をアクティベートする

まず初めに Google Developers Console で次の作業を行います。

  1. プロジェクトを作成または選択する
  2. Google Maps JavaScript API と関連サービスをアクティベートする
  3. 適切なキーを作成する
続ける

Place Autocomplete and Directions

Read the Autocomplete and Directions documentation or view this example full screen.

// 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);
  var me = this;
  radioButton.addEventListener('click', function() {
    me.travelMode = mode;
    me.route();
  });
};

AutocompleteDirectionsHandler.prototype.setupPlaceChangedListener = function(autocomplete, mode) {
  var me = this;
  autocomplete.bindTo('bounds', this.map);
  autocomplete.addListener('place_changed', function() {
    var place = autocomplete.getPlace();
    if (!place.place_id) {
      window.alert("Please select an option from the dropdown list.");
      return;
    }
    if (mode === 'ORIG') {
      me.originPlaceId = place.place_id;
    } else {
      me.destinationPlaceId = place.place_id;
    }
    me.route();
  });

};

AutocompleteDirectionsHandler.prototype.route = function() {
  if (!this.originPlaceId || !this.destinationPlaceId) {
    return;
  }
  var me = this;

  this.directionsService.route({
    origin: {'placeId': this.originPlaceId},
    destination: {'placeId': this.destinationPlaceId},
    travelMode: this.travelMode
  }, function(response, status) {
    if (status === 'OK') {
      me.directionsDisplay.setDirections(response);
    } else {
      window.alert('Directions request failed due to ' + status);
    }
  });
};
<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>
/* 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;
}
<!-- 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>

実際に試す

コードブロックの右上にカーソルを合わせて、コードをコピーするか、コードを JSFiddl で開きます。

<!DOCTYPE html>
<html>
  <head>
    <title>Place Autocomplete</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
      /* 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;
      }

    </style>
  </head>
  <body>
    <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>

    <script>
      // 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);
        var me = this;
        radioButton.addEventListener('click', function() {
          me.travelMode = mode;
          me.route();
        });
      };

      AutocompleteDirectionsHandler.prototype.setupPlaceChangedListener = function(autocomplete, mode) {
        var me = this;
        autocomplete.bindTo('bounds', this.map);
        autocomplete.addListener('place_changed', function() {
          var place = autocomplete.getPlace();
          if (!place.place_id) {
            window.alert("Please select an option from the dropdown list.");
            return;
          }
          if (mode === 'ORIG') {
            me.originPlaceId = place.place_id;
          } else {
            me.destinationPlaceId = place.place_id;
          }
          me.route();
        });

      };

      AutocompleteDirectionsHandler.prototype.route = function() {
        if (!this.originPlaceId || !this.destinationPlaceId) {
          return;
        }
        var me = this;

        this.directionsService.route({
          origin: {'placeId': this.originPlaceId},
          destination: {'placeId': this.destinationPlaceId},
          travelMode: this.travelMode
        }, function(response, status) {
          if (status === 'OK') {
            me.directionsDisplay.setDirections(response);
          } else {
            window.alert('Directions request failed due to ' + status);
          }
        });
      };

    </script>
    <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places&callback=initMap"
        async defer></script>
  </body>
</html>

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Google Maps JavaScript API
Google Maps JavaScript API
ご不明な点がありましたら、Google のサポートページをご覧ください。