Jupyter notebook: Widget Javascript not detected

Question

Question: I installed python3 and jupyter notebook using pip3 in MacOs 10.9.
When I try to run the widget it gives error that there is no javascript widget. I have python3 and R kernels installed in Jupyter-notebook.

Code:

from ipywidgets import widgets
from IPython.display import display
text = widgets.Text()
display(text)
text.on_submit('hello')

Error:

Widget Javascript not detected. It may not be installed or enabled properly. 

Attempts:

sudo -H pip3 install ipywidgets 
sudo -H pip3 install --upgrade ipywidgets 
jupyter nbextension enable --py widgetsnbextension
# restarted the computer. 

The last command gives error.

[EnableNBExtensionApp] CRITICAL | Bad config encountered during initialization:
[EnableNBExtensionApp] CRITICAL | Unrecognized flag: '--py'

Note that in mac I have jupyter-nbextension command but the command:

jupyter-nbextension enable --py widgetsnbextension 

does not work either.

But jupyter nbextension enable widgetsnbextension gives no error and also does nothing. The same error is popped in if I run the code.

Also,

import ipywidgets
ipywidgets.__version__

gives '6.0.0'.

Some notes:

which jupyter 
jupyter is /Library/Frameworks/Python.framework/Versions/3.5/bin/jupyter
which jupyter-notebook
jupyter-notebook is /Library/Frameworks/Python.framework/Versions/3.5/bin/jupyter-notebook

Related links:

https://github.com/jupyter-widgets/ipywidgets/issues/541 
https://github.com/jupyter/help/issues/32 
https://github.com/jupyter/help/issues/131 
https://github.com/binder-project/binder/issues/83 

How can I install widgets?
Do I need to install java separately ?

• Eugene Belogay: Answered here (bad news -- ipywidgets not supported by PyCharm): stackoverflow.com/questions/41106767/…

Answer 1

Run the following command: jupyter nbextension enable --py --sys-prefix widgetsnbextension, then restart the kernel in Jupyter should do the trick.

• BhishanPoudel: Enabling notebook extension is SUCCESSFUL, but , however, the module widgets still gives the error: Widget Javascript not detected. It may not be installed or enabled properly. Can we also solve WIDGETS problem???
• chjortlund: Your not just missing the ipywidgets? Try installing it by running: pip install ipywidgets
• maria: Thanks @chjortlund, pip install ipywidgets helped for me
• mccurcio: This works for python 3.10 with NO anaconda.

Answer 2

The answer from chjortlund did not work for me because I don't have root rights. This solved it for me:

pip3 install --upgrade ipywidgets
jupyter nbextension enable --py widgetsnbextension

Answer 3

I used the following commands successfully with Jupyter, Mac OS, Python 3.6, and Anaconda. The first command gets the latest version of ipywidgets at this time (version 7.0).

conda install -c conda-forge ipywidgets
jupyter nbextension enable --py widgetsnbextension

• dcatteeu: Indeed, the conda-forge version of ipywidgets is newer and this solves the problem in my case.

Answer 4

This solved it for me:

jupyter labextension install @jupyter-widgets/jupyterlab-manager

Answer 5

I faced the same problem and after running the command:jupyter nbextension enable --py --sys-prefix widgetsnbextension, the prompt should appear:

>Enabling notebook extension jupyter-js-widgets/extension...

- Validating: ok. Refresh your jupyter notebook and the widgets worked.

Answer 6

Probably the best way, at least it worked for me: reinstall the ipywidgets and widgetsextension and it should work.

pip uninstall ipywidgets widgetsnbextension
pip install ipywidgets
jupyter nbextension enable --py --sys-prefix widgetsnbextension