Installation and configuration
First install the Leaflet module 7.x-1.3 or later and Leaflet JS library v0.7.x or 1.0.x, following the Leaflet README.
Then download the MarkerCluster library from https://github.com/Leaflet/Leaflet.markercluster/tree/leaflet-0.7.
IMPORTANT: if you wish to use Leaflet JS 1.0.0-beta, then for now replace the aforementioned leaflet.markercluster.js by this file, using the original name, 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 has been sponsored by Marzee Labs.