[BUG] Lonboard data doesn't render in Marimo

[wrynearson]

Context

Note: This could be an issue with marimo, not with lonboard.

I have a Jupyter notebook that visualizes a gdf using the viz function, which works as expected.

Resulting behaviour, error message or logs

When I try to show the same data in a marimo notebook, the viz function displays a map, but doesn't display any data.

I've confirmed that the gdf is the same in both the Jupyter and marimo notebooks.

Using a different dataset, the same issue appears when using the Map function calling PathLayer.from_geopandas. Interestingly, the bounds of the rendered maps in marimo align with the geographic extent of the data.

In the browser console, I see the following error message:

loading child models or setting bounds: Error: widget_manager not supported in marimo
    at Object.get_model ( ... )

Environment

• OS: MacOS 15.4.1
• Browser: Arc 1.95.0 (Chromium 136.0.7103.114)
• Lonboard Version: 0.10.4

Steps to reproduce the bug

1. Convert known working Jupyter notebook with marimo convert <notebook.ipynb> -o <notebook.py>
2. Start marimo notebook with marimo edit <notebook.py>

[kylebarron]

Thanks for the bug report.

From the traceback I think this is just because Marimo doesn't support accessing the underlying ipywidgets widget manager, because they have a non-Jupyter implementation. We need to use the widget manager as we have nested collections of widgets. As such I think Lonboard just doesn't work in Marimo currently.

Tagging @manzt as he's the author of anywidget and starting work at marimo soon.