Voila: Notebook extensions not working in voila frontend?

[janfreyberg]

Hi all,

I've been enjoying voila so far for rendering widgets as websites.

One issue I'm having is I seemingly can't use a notebook extension I use in a widget.

Specifically, my widget superintendent uses ipyevents for capturing keyboard keystrokes. ipyevents provites a jupyter extension that can capture keystrokes.

While it works in a notebook, it doesn't work when presenting that notebook using voila.

Example:

pip install git+https://github.com/janfreyberg/superintendent.git
jupyter nbextension enable --py --sys-prefix ipyevents

from superintendent import SemiSupervisor
import numpy as np

SemiSupervisor(
   features=np.random.randint(10, shape=(10, 3)),
   options=range(10),
   keyboard_shortcuts=True
)

This should allow the user to press e.g. the "1" key to label a row as 1, but this doesn't work in voila.

Is this intentional? Is there a workaround?

[SylvainCorlay]

Hey @janfreyberg sorry for the late reply. I could troubleshoot your issue

• there was a minor bug in ipyevents which I am fixing here: https://github.com/mwcraig/ipyevents/pull/28. The specified frontend version, which is not used in the classic notebook (only in jupyterlab and in web embedding contexts) was not up to date.
• I could check locally and it appears to be working.

[SylvainCorlay]

Closing as I am doing triage. Let me know if you have any other question.

[janfreyberg]

Amazing, thanks for looking into this!

[mwcraig]

@janfreyberg -- I just put ipyevents 0.3.2 on pypi and 1.3.2 on npm. Could you please try updating? If it doesn't work please open an issue at https://github.com/mwcraig/ipyevents/issues

I'll get the conda-forge package updated later today.

[janfreyberg]

@mwcraig can confirm that it works with the latest version of ipyevents! Thanks for sorting this so quickly.

[SylvainCorlay]

🎉