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

Adding state to controls

This example demonstrates adding controls that store state. It shows a map with two buttons, "Set Center" and "Center Map". The "Set Center" button can be used to store the center of the map. Pressing the "Center Map" button will pan the map to the previously stored center.

Read the documentation or view this example full screen.

var map;
var chicago = {lat: 41.85, lng: -87.65};

/**
 * The CenterControl adds a control to the map that recenters the map on
 * Chicago.
 * @constructor
 * @param {!Element} controlDiv
 * @param {!google.maps.Map} map
 * @param {?google.maps.LatLng} center
 */
function CenterControl(controlDiv, map, center) {
  // We set up a variable for this since we're adding event listeners
  // later.
  var control = this;

  // Set the center property upon construction
  control.center_ = center;
  controlDiv.style.clear = 'both';

  // Set CSS for the control border
  var goCenterUI = document.createElement('div');
  goCenterUI.id = 'goCenterUI';
  goCenterUI.title = 'Click to recenter the map';
  controlDiv.appendChild(goCenterUI);

  // Set CSS for the control interior
  var goCenterText = document.createElement('div');
  goCenterText.id = 'goCenterText';
  goCenterText.innerHTML = 'Center Map';
  goCenterUI.appendChild(goCenterText);

  // Set CSS for the setCenter control border
  var setCenterUI = document.createElement('div');
  setCenterUI.id = 'setCenterUI';
  setCenterUI.title = 'Click to change the center of the map';
  controlDiv.appendChild(setCenterUI);

  // Set CSS for the control interior
  var setCenterText = document.createElement('div');
  setCenterText.id = 'setCenterText';
  setCenterText.innerHTML = 'Set Center';
  setCenterUI.appendChild(setCenterText);

  // Set up the click event listener for 'Center Map': Set the center of
  // the map
  // to the current center of the control.
  goCenterUI.addEventListener('click', function() {
    var currentCenter = control.getCenter();
    map.setCenter(currentCenter);
  });

  // Set up the click event listener for 'Set Center': Set the center of
  // the control to the current center of the map.
  setCenterUI.addEventListener('click', function() {
    var newCenter = map.getCenter();
    control.setCenter(newCenter);
  });
}

/**
 * Define a property to hold the center state.
 * @private
 */
CenterControl.prototype.center_ = null;

/**
 * Gets the map center.
 * @return {?google.maps.LatLng}
 */
CenterControl.prototype.getCenter = function() {
  return this.center_;
};

/**
 * Sets the map center.
 * @param {?google.maps.LatLng} center
 */
CenterControl.prototype.setCenter = function(center) {
  this.center_ = center;
};

function initMap() {
  map = new google.maps.Map(document.getElementById('map'), {
    zoom: 12,
    center: chicago
  });

  // Create the DIV to hold the control and call the CenterControl()
  // constructor
  // passing in this DIV.
  var centerControlDiv = document.createElement('div');
  var centerControl = new CenterControl(centerControlDiv, map, chicago);

  centerControlDiv.index = 1;
  centerControlDiv.style['padding-top'] = '10px';
  map.controls[google.maps.ControlPosition.TOP_CENTER].push(centerControlDiv);
}
<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;
}
#goCenterUI, #setCenterUI {
  background-color: #fff;
  border: 2px solid #fff;
  border-radius: 3px;
  box-shadow: 0 2px 6px rgba(0,0,0,.3);
  cursor: pointer;
  float: left;
  margin-bottom: 22px;
  text-align: center;
}
#goCenterText, #setCenterText {
  color: rgb(25,25,25);
  font-family: Roboto,Arial,sans-serif;
  font-size: 15px;
  line-height: 25px;
  padding-left: 5px;
  padding-right: 5px;
}
#setCenterUI {
  margin-left: 12px;
}
 <!-- 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>

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>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Adding state to controls</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;
      }
      #goCenterUI, #setCenterUI {
        background-color: #fff;
        border: 2px solid #fff;
        border-radius: 3px;
        box-shadow: 0 2px 6px rgba(0,0,0,.3);
        cursor: pointer;
        float: left;
        margin-bottom: 22px;
        text-align: center;
      }
      #goCenterText, #setCenterText {
        color: rgb(25,25,25);
        font-family: Roboto,Arial,sans-serif;
        font-size: 15px;
        line-height: 25px;
        padding-left: 5px;
        padding-right: 5px;
      }
      #setCenterUI {
        margin-left: 12px;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      var map;
      var chicago = {lat: 41.85, lng: -87.65};

      /**
       * The CenterControl adds a control to the map that recenters the map on
       * Chicago.
       * @constructor
       * @param {!Element} controlDiv
       * @param {!google.maps.Map} map
       * @param {?google.maps.LatLng} center
       */
      function CenterControl(controlDiv, map, center) {
        // We set up a variable for this since we're adding event listeners
        // later.
        var control = this;

        // Set the center property upon construction
        control.center_ = center;
        controlDiv.style.clear = 'both';

        // Set CSS for the control border
        var goCenterUI = document.createElement('div');
        goCenterUI.id = 'goCenterUI';
        goCenterUI.title = 'Click to recenter the map';
        controlDiv.appendChild(goCenterUI);

        // Set CSS for the control interior
        var goCenterText = document.createElement('div');
        goCenterText.id = 'goCenterText';
        goCenterText.innerHTML = 'Center Map';
        goCenterUI.appendChild(goCenterText);

        // Set CSS for the setCenter control border
        var setCenterUI = document.createElement('div');
        setCenterUI.id = 'setCenterUI';
        setCenterUI.title = 'Click to change the center of the map';
        controlDiv.appendChild(setCenterUI);

        // Set CSS for the control interior
        var setCenterText = document.createElement('div');
        setCenterText.id = 'setCenterText';
        setCenterText.innerHTML = 'Set Center';
        setCenterUI.appendChild(setCenterText);

        // Set up the click event listener for 'Center Map': Set the center of
        // the map
        // to the current center of the control.
        goCenterUI.addEventListener('click', function() {
          var currentCenter = control.getCenter();
          map.setCenter(currentCenter);
        });

        // Set up the click event listener for 'Set Center': Set the center of
        // the control to the current center of the map.
        setCenterUI.addEventListener('click', function() {
          var newCenter = map.getCenter();
          control.setCenter(newCenter);
        });
      }

      /**
       * Define a property to hold the center state.
       * @private
       */
      CenterControl.prototype.center_ = null;

      /**
       * Gets the map center.
       * @return {?google.maps.LatLng}
       */
      CenterControl.prototype.getCenter = function() {
        return this.center_;
      };

      /**
       * Sets the map center.
       * @param {?google.maps.LatLng} center
       */
      CenterControl.prototype.setCenter = function(center) {
        this.center_ = center;
      };

      function initMap() {
        map = new google.maps.Map(document.getElementById('map'), {
          zoom: 12,
          center: chicago
        });

        // Create the DIV to hold the control and call the CenterControl()
        // constructor
        // passing in this DIV.
        var centerControlDiv = document.createElement('div');
        var centerControl = new CenterControl(centerControlDiv, map, chicago);

        centerControlDiv.index = 1;
        centerControlDiv.style['padding-top'] = '10px';
        map.controls[google.maps.ControlPosition.TOP_CENTER].push(centerControlDiv);
      }
    </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
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。