You're all set!

To start developing, please head over to our developer documentation.

Activate the Google Maps JavaScript API

To get you started we'll guide you through the Google Developers Console to do a few things first:

  1. Create or choose a project
  2. Activate the Google Maps JavaScript API and related services
  3. Create appropriate keys
Continue

Using closures in event listeners

This example creates a map with tappable markers displaying a secret message.

Read the documentation or view this example full screen.

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 4,
    center: {lat: -25.363882, lng: 131.044922 }
  });

  var bounds = {
    north: -25.363882,
    south: -31.203405,
    east: 131.044922,
    west: 125.244141
  };

  // Display the area between the location southWest and northEast.
  map.fitBounds(bounds);

  // Add 5 markers to map at random locations.
  // For each of these markers, give them a title with their index, and when
  // they are clicked they should open an infowindow with text from a secret
  // message.
  var secretMessages = ['This', 'is', 'the', 'secret', 'message'];
  var lngSpan = bounds.east - bounds.west;
  var latSpan = bounds.north - bounds.south;
  for (var i = 0; i < secretMessages.length; ++i) {
    var marker = new google.maps.Marker({
      position: {
        lat: bounds.south + latSpan * Math.random(),
        lng: bounds.west + lngSpan * Math.random()
      },
      map: map
    });
    attachSecretMessage(marker, secretMessages[i]);
  }
}

// Attaches an info window to a marker with the provided message. When the
// marker is clicked, the info window will open with the secret message.
function attachSecretMessage(marker, secretMessage) {
  var infowindow = new google.maps.InfoWindow({
    content: secretMessage
  });

  marker.addListener('click', function() {
    infowindow.open(marker.get('map'), marker);
  });
}
<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;
}
<!-- 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>

Try it yourself

Hover at top right of the code block to copy the code or open it in JSFiddle.

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Using closures in event listeners</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;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      function initMap() {
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 4,
          center: {lat: -25.363882, lng: 131.044922 }
        });

        var bounds = {
          north: -25.363882,
          south: -31.203405,
          east: 131.044922,
          west: 125.244141
        };

        // Display the area between the location southWest and northEast.
        map.fitBounds(bounds);

        // Add 5 markers to map at random locations.
        // For each of these markers, give them a title with their index, and when
        // they are clicked they should open an infowindow with text from a secret
        // message.
        var secretMessages = ['This', 'is', 'the', 'secret', 'message'];
        var lngSpan = bounds.east - bounds.west;
        var latSpan = bounds.north - bounds.south;
        for (var i = 0; i < secretMessages.length; ++i) {
          var marker = new google.maps.Marker({
            position: {
              lat: bounds.south + latSpan * Math.random(),
              lng: bounds.west + lngSpan * Math.random()
            },
            map: map
          });
          attachSecretMessage(marker, secretMessages[i]);
        }
      }

      // Attaches an info window to a marker with the provided message. When the
      // marker is clicked, the info window will open with the secret message.
      function attachSecretMessage(marker, secretMessage) {
        var infowindow = new google.maps.InfoWindow({
          content: secretMessage
        });

        marker.addListener('click', function() {
          infowindow.open(marker.get('map'), marker);
        });
      }
    </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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