Widget Javascript not detected

debugging from notebook

from jupyter_core.paths import jupyter_config_path, jupyter_data_dir, jupyter_runtime_dir, jupyter_path
import jupyter_core.version

!echo !jupyter --version and --path
!jupyter --version
!jupyter --path
!echo

!echo !cat /usr/etc/jupyter/nbconfig/notebook.json
!cat /usr/etc/jupyter/nbconfig/notebook.json
!echo
!echo !ls /usr/local/share/jupyter/nbextensions/jupyter-js-widgets
!ls /usr/local/share/jupyter/nbextensions/jupyter-js-widgets
!echo

print('version:', jupyter_core.version.__version__)
for p in jupyter_config_path():
    print('config:', p)

# list of directories to search for data files...
for p in jupyter_path():
    print('jupyter_path:', p)

print('jupyter_data_dir:', jupyter_data_dir())
print('jupyter_runtime_dir:', jupyter_runtime_dir())

import ipywidgets as widgets
widgets.HTML(value="Hello <b>World</b>")

output

!jupyter --version and --path
4.1.0
config:
    /u/s8weber/.jupyter
    /usr/etc/jupyter
    /usr/local/etc/jupyter
    /etc/jupyter
data:
    /u/s8weber/.local/share/jupyter
    /usr/local/share/jupyter
    /usr/share/jupyter
runtime:
    /u/s8weber/.local/share/jupyter/runtime

!cat /usr/etc/jupyter/nbconfig/notebook.json
{
  "load_extensions": {
    "jupyter-js-widgets/extension": true
  }
}
!ls /usr/local/share/jupyter/nbextensions/jupyter-js-widgets
extension.js  extension.js.map

version: 4.1.0
config: /u/s8weber/.jupyter
config: /usr/etc/jupyter
config: /usr/local/etc/jupyter
config: /etc/jupyter
jupyter_path: /u/s8weber/.local/share/jupyter
jupyter_path: /usr/local/share/jupyter
jupyter_path: /usr/share/jupyter
jupyter_data_dir: /u/s8weber/.local/share/jupyter
jupyter_runtime_dir: /u/s8weber/.local/share/jupyter/runtime

** Widget Javascript not detected.  It may not be installed properly. Did you enable the widgetsnbextension? If not, then run "jupyter nbextension enable --py --sys-prefix widgetsnbextension"

using python3 and jupyterhub… not sure what next to look at.

[jbednar]

I don’t know about anyone else, but I still see this message ALL THE TIME, on lots of different systems. Sometimes it goes away after running the suggested command, sometimes it doesn’t. Sometimes reinstalling ipywidgets helps, sometimes it doesn’t. Sometimes it means the widgets aren’t working, sometimes it doesn’t. Sometimes I manage to get it to go away somehow, but then it comes back the next time anything is upgraded. This message and the associated machinery is really a big pain when using ipywidgets. 😦

[jasongrout]

This issue is fixed in the upcoming 7.0 release. I hope to have a beta out by the end of the week.