Leaflet Markercluster
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Provides Beautiful Animated Marker Clustering functionality for Leaflet using the Leaflet MarkerCluster library.
Installation and configuration
First install the Leaflet module 7.x-1.4 or later and Leaflet JS library 1.0.2 or later, following the Leaflet README.
Then download the MarkerCluster library v1.0.0 or later from, say, https://github.com/Leaflet/Leaflet.markercluster/archive/v1.0.0.zip
The core part of the zip file is a directory named dist. Make sure this directory ends up in sites/all/libraries/leaflet_markercluster, so that the path to the essential javascript file becomes sites/all/libraries/leaflet_markercluster/dist/leaflet.markercluster.js
Enable the module. All Leaflet maps will now be using clustering out of the box.
If not, visit the Status Report page, admin/reports/status, for error messages.
This module does not itself have a UI to set MarkerCluster configuration parameters. However parameters may be set through javascript, Drupal code or other modules, e.g., IP Geolocation Views & Maps. Consult the README for details.
Credits
This module has been sponsored by Marzee Labs.