Posted By

adamvarga on 02/03/10


googlemaps markerclusterer

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Zoom all the way in to a marker cluster with markerclusterer.js

 / Published in: JavaScript

MarkerClusterer is an awesome marker clustering utility for the Google Maps API. Currently when you click on a cluster, the map is re-centered and zooms in one level. This is sometimes a problem if your markers are very close together and the map is zoomed very far out. It take a few clicks before the markers become unclustered.

This snippet modifies the clusterclick behavior, so that clicking on a cluster zooms in more intelligently. Instead of simply zooming in one level, the bounds of the map are redefined based on the lat/long of the markers that a cluster contains.

Make sure you are using the dev branch of MarkerClusterer, earlier versions do not allow you to override the default clusterclick behavior.

Be sure to set zoomOnClick: false.

Also, this script make's use of jQuery's $.each() function. If you aren't using jQuery, you should find a different way to iterate through the loop.

  1. GEvent.addListener(markerCluster, "clusterclick", function (cluster) {
  2. var markers = cluster.getMarkers();
  3. var bounds = new GLatLngBounds();
  4. $.each(markers, function(i, marker){
  5. bounds.extend(marker.marker.getLatLng());
  6. });
  7. map.setCenter(bounds.getCenter(), map.getBoundsZoomLevel(bounds));
  8. });

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