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

Marker Labels

Read the documentation or view this example full screen.

// In the following example, markers appear when the user clicks on the map.
// Each marker is labeled with a single alphabetical character.
var labels = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
var labelIndex = 0;

function initialize() {
  var bangalore = { lat: 12.97, lng: 77.59 };
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 12,
    center: bangalore
  });

  // This event listener calls addMarker() when the map is clicked.
  google.maps.event.addListener(map, 'click', function(event) {
    addMarker(event.latLng, map);
  });

  // Add a marker at the center of the map.
  addMarker(bangalore, map);
}

// Adds a marker to the map.
function addMarker(location, map) {
  // Add the marker at the clicked location, and add the next-available label
  // from the array of alphabetical characters.
  var marker = new google.maps.Marker({
    position: location,
    label: labels[labelIndex++ % labels.length],
    map: map
  });
}

google.maps.event.addDomListener(window, 'load', initialize);
<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 src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></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>Marker Labels</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>
    <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY"></script>
    <script>
      // In the following example, markers appear when the user clicks on the map.
      // Each marker is labeled with a single alphabetical character.
      var labels = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
      var labelIndex = 0;

      function initialize() {
        var bangalore = { lat: 12.97, lng: 77.59 };
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 12,
          center: bangalore
        });

        // This event listener calls addMarker() when the map is clicked.
        google.maps.event.addListener(map, 'click', function(event) {
          addMarker(event.latLng, map);
        });

        // Add a marker at the center of the map.
        addMarker(bangalore, map);
      }

      // Adds a marker to the map.
      function addMarker(location, map) {
        // Add the marker at the clicked location, and add the next-available label
        // from the array of alphabetical characters.
        var marker = new google.maps.Marker({
          position: location,
          label: labels[labelIndex++ % labels.length],
          map: map
        });
      }

      google.maps.event.addDomListener(window, 'load', initialize);
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>

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Google Maps JavaScript API
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