Folium: Combining `GeoJson` markers in a `MarkerCluster` shows unclustered markers

[diegoquintanav]

Please add a code sample or a nbviewer link, copy-pastable if possible

with open('examples/data/search_bars_rome.json') as f:
    data = json.load(f)
data_url = 'https://raw.githubusercontent.com/python-visualization/folium/master/examples/data/search_bars_rome.json'

m = folium.Map((41.9, 12.5), tiles='cartodbpositron')
marker_cluster = folium.plugins.MarkerCluster(name='mc').add_to(m)
folium.GeoJson(data_url, embed=False).add_to(marker_cluster)
folium.GeoJson(data_url, embed=False, name='geojson').add_to(m)
folium.LayerControl(collapsed=False).add_to(m)
m.save('_map.html')
m

Problem description

I expected to see the markers in a clustered fashion

I can't tell from #1190, #1129 and #1188 if this is fixed in version 0.10.0, and if it is, what's the right syntax?

Expected Output

Clustered markers (This was taken from another example)

Output of folium.__version__

'0.10.0'

[fullonic]

Hi @diegoquintanav, I think that #1190 fixed the problem you mention, and it was done after the release of version 10. Therefore, would be better install folium directly from github give it a try again.

[fullonic]

Confirmed! It works with folium installed directly from github.
I had time to run your script and here is a screenshot of the html file.

[vjsequi]

I am having the same issues I'm afraid. It doesn't render the MarkerCluster at all.

Thanks for your help!

[Conengmo]

It seems #1190 (merged July 2019) and #1289 (merged April 2020) are at odds with each other. We have to resolve the conflicting requirements. Some ideas:

• make the ajax call synchronous and add to parent when it finished
• move the embedded data to the GeoJson() call and accept that not al functionality will work when not embedding data.

[vjsequi]

I think I've found a way round it. If you make the GeoJson a subgroup of the MarkerCluster it seems to work. Although weirdly you need to untick and tick GeoJson layer (Housing) for it show anything.

with open('examples/data/search_bars_rome.json') as f:
    data = json.load(f)
data_url = 'https://raw.githubusercontent.com/python-visualization/folium/master/examples/data/search_bars_rome.json'

m = folium.Map((41.9, 12.5), tiles='cartodbpositron')
marker_cluster = folium.plugins.MarkerCluster(name='Developments')
mc1= folium.plugins.FeatureGroupSubGroup(marker_cluster, 'Housing')
m.add_child(marker_cluster)
m.add_child(Housing)
mc1.add_child(folium.GeoJson(data_url, embed=False))
folium.LayerControl(collapsed=False).add_to(m)
m

My next query is, how can I show labels, either tooltips or popups? Substituting mc1 with the code below doesn't seem to work.

mc1.add_child(folium.GeoJson(data_url, tooltip=folium.GeoJsonTooltip(fields=['addr:street']), embed=False))

[Conengmo]

It seems combining GeoJsonTooltip and MarkerCluster plugin is not supported behavior. Note that while everything in the base folium library should work well together we can't guarantee that for the plugins.

I don't think using the FeatureGroupSubGroup plugin is a real solution here. I'll make a PR where we do the ajax call asynchronously.

[Conengmo]

The fix has been merged. It will be in the next release, v0.12.0, release date yet unknown. If you want it earlier you can install folium from the main branch:

pip install git+https://github.com/python-visualization/folium.git@master