Marker Clustering

by Town

HTML

<div id="map"></div>
<!-- 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>
<script src="https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/markerclusterer.js"></script>

CSS

/* 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;
}

JavaScript

function initMap() {

  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 3,
    center: {lat: -28.024, lng: 140.887}
  });
 debugger;
  // Create an array of alphabetical characters used to label the markers.
  var labels = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

  // Add some markers to the map.
  // Note: The code uses the JavaScript Array.prototype.map() method to
  // create an array of markers based on a given "locations" array.
  // The map() method here has nothing to do with the Google Maps API.
  var markers = locations.map(function(location, i) {
    return new google.maps.Marker({
      position: location,
      label: labels[i % labels.length]
    });
  });

  // Add a marker clusterer to manage the markers.
  var markerCluster = new MarkerClusterer(map, markers,
      {imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m'});
}
var locations = [
  {lat: -31.563910, lng: 147.154312},
  {lat: -33.718234, lng: 150.363181},
  {lat: -33.727111, lng: 150.371124},
  {lat: -33.848588, lng: 151.209834},
  {lat: -33.851702, lng: 151.216968},
  {lat: -34.671264, lng: 150.863657},
  {lat: -35.304724, lng: 148.662905},
  {lat: -36.817685, lng: 175.699196},
  {lat: -36.828611, lng: 175.790222},
  {lat: -37.750000, lng: 145.116667},
  {lat: -37.759859, lng: 145.128708},
  {lat: -37.765015, lng: 145.133858},
  {lat: -37.770104, lng: 145.143299},
  {lat: -37.773700, lng: 145.145187},
  {lat: -37.774785, lng: 145.137978},
  {lat: -37.819616, lng: 144.968119},
  {lat: -38.330766, lng: 144.695692},
  {lat: -39.927193, lng: 175.053218},
  {lat: -41.330162, lng: 174.865694},
  {lat: -42.734358, lng: 147.439506},
  {lat: -42.734358, lng: 147.501315},
  {lat: -42.735258, lng: 147.438000},
  {lat: -43.999792, lng: 170.463352}
]