A custom legend based on this example https://leafletjs.com/examples/choropleth/. It aim to pass a small legend configured as a dictionnary to ipyleaflet as a LeafletControl.
To install use pip:
$ pip install ipyleaflet_legend
$ jupyter nbextension enable --py --sys-prefix ipyleaflet_legend
To install for jupyterlab
$ jupyter labextension install ipyleaflet_legend
For a development installation (requires npm),
$ git clone https://github.com/weatherforce/ipyleaflet-legend.git
$ cd ipyleaflet-legend
$ pip install -e .
$ jupyter nbextension install --py --symlink --sys-prefix ipyleaflet_legend
$ jupyter nbextension enable --py --sys-prefix ipyleaflet_legend
$ jupyter labextension install js
When actively developing your extension, build Jupyter Lab with the command:
$ jupyter lab --watch
This take a minute or so to get started, but then allows you to hot-reload your javascript extension. To see a change, save your javascript, watch the terminal for an update.
Note on first jupyter lab --watch, you may need to touch a file to get Jupyter Lab to open.