grouped layer control

Take a look to Extensions for Leaflet Map.

You can group the elements on the map by criteria and show/hide them.

Here are examples.

Thank you

I already tried it. But I can’t figure out something like this:
https://github.com/ismyrnow/leaflet-groupedlayercontrol?tab=readme-ov-file

The last example on this page is similar, but with leaflet-markers. It should work with leaflet-geojson also. If you give me an example geojson file, I can test it.

For example two groups with subcategory and typology

{ “type”: “FeatureCollection”, “features”: [ { “type”: “Feature”, “geometry”: { “type”: “Point”, “coordinates”: [ “12.667688”, “41.790397” ] }, “properties”: { “title”: “ahi”, “author”: “ahi”, “date”: “2024-05-26”, “category”: “le-radici”, “subcategory”: “sub4”, “typology”: “documento” } }, { “type”: “Feature”, “geometry”: { “type”: “Point”, “coordinates”: [ “12.677688”, “41.780397” ] }, “properties”: { “title”: “test”, “author”: “autore”, “date”: “2024-05-26”, “category”: “le-radici”, “subcategory”: “sub4”, “typology”: “documento” } }, { “type”: “Feature”, “geometry”: { “type”: “Point”, “coordinates”: [ “12.757688”, “41.670397” ] }, “properties”: { “title”: “test”, “author”: “autore2”, “date”: “2024-05-25”, “category”: “le-radici”, “subcategory”: “sub2”, “typology”: “giornale” } }, { “type”: “Feature”, “geometry”: { “type”: “Point”, “coordinates”: [ “12.657688”, “41.770397” ] }, “properties”: { “title”: “test”, “author”: “autore”, “date”: “2024-05-26”, “category”: “le-radici”, “subcategory”: “sub2”, “typology”: “libro” } }, { “type”: “Feature”, “geometry”: { “type”: “Point”, “coordinates”: [ “9.189634”, “45.464194” ] }, “properties”: { “title”: “viva viva la befana”, “author”: “prova”, “date”: “2024-05-18”, “category”: “le-radici”, “subcategory”: “sub2”, “typology”: “documento” } } ] }

Extensions for Leaflet Map uses the Leaflet Plugin Leaflet.FeatureGroup.SubGroup to group markers. Every marker belongs to exact one group. I realized the demo SubGroup with standard L.Control.Layers to display Nested Groups.

But testing your geojson, I found a bug, [parentgroup] works with [leaflet-(extra)marker] only yet.

I have a new solution in version 4.3.1, please try it.