Jupyter notebook: Widget Javascript not detected

问题

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

回答1:

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

回答2:

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

回答3:

This solved it for me:

jupyter labextension install @jupyter-widgets/jupyterlab-manager

回答4:

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.

回答5:

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

来源：https://stackoverflow.com/questions/43769068/jupyter-notebook-widget-javascript-not-detected

标签

jupyter-notebook