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 ?

Asked By: BhishanPoudel

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Source

Answer 1

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

Answered By: chjortlund

Answer 2

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.

Answered By: Lucas Igor Balthazar

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

Answered By: stackoverflowuser2010

Answer 4

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

Answered By: Adarsh Trivedi

Answer 5

This solved it for me:

jupyter labextension install @jupyter-widgets/jupyterlab-manager

Answered By: Vikash Madhow

Answer 6

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

Answered By: Matĕj Mezera

Jupyter notebook: Widget Javascript not detected

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