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

Retrieving Autocomplete Predictions

Read the documentation or view this example full screen.

// This example retrieves autocomplete predictions programmatically from the
// autocomplete service, and displays them as an HTML list.

// 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 initService() {
  var displaySuggestions = function(predictions, status) {
    if (status != google.maps.places.PlacesServiceStatus.OK) {
      alert(status);
      return;
    }

    predictions.forEach(function(prediction) {
      var li = document.createElement('li');
      li.appendChild(document.createTextNode(prediction.description));
      document.getElementById('results').appendChild(li);
    });
  };

  var service = new google.maps.places.AutocompleteService();
  service.getQueryPredictions({ input: 'pizza near Syd' }, displaySuggestions);
}
<div id="right-panel">
  <p>Query suggestions for 'pizza near Syd':</p>
  <ul id="results"></ul>
</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;
}
#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;
}
<!-- Replace the value of the key parameter with your own API key. -->
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=places&callback=initService"
        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>Retrieving Autocomplete Predictions</title>
    <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;
      }
      #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;
      }
    </style>
  </head>
  <body>
    <div id="right-panel">
      <p>Query suggestions for 'pizza near Syd':</p>
      <ul id="results"></ul>
    </div>
    <script>
      // This example retrieves autocomplete predictions programmatically from the
      // autocomplete service, and displays them as an HTML list.

      // 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 initService() {
        var displaySuggestions = function(predictions, status) {
          if (status != google.maps.places.PlacesServiceStatus.OK) {
            alert(status);
            return;
          }

          predictions.forEach(function(prediction) {
            var li = document.createElement('li');
            li.appendChild(document.createTextNode(prediction.description));
            document.getElementById('results').appendChild(li);
          });
        };

        var service = new google.maps.places.AutocompleteService();
        service.getQueryPredictions({ input: 'pizza near Syd' }, displaySuggestions);
      }
    </script>
    <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places&callback=initService"
        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。