In this user guide, we will look at several possible causes that might be preventing the Warning widget from being detected, and then suggest some possible fixes that you can use to try to resolve the issue.


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    question:I also installed Python3 jupyter notebook with pip3 on MacOs 10.9.
    When I try to run the application, I get a message that the JavaScript widget is missing.I have installed Python3 as well as Kernels r in Jupyter notebook.

      ipywidgets import widgetsImport from IPython.display Displaytext = Widgets.Text ()Display (text)text.on_submit ('Hello') 
      Unknown JavaScript widget. It may not install properly. 
      sudo -H pip3 install ipywidgetssudo -H pip3 install Ipywidgets -upgradejupyter nbextension enable --py widgetsnbextension# restarted several computers. 
      [EnableNBExtensionApp] CRITICAL | Incorrect configuration occurred during initialization:[ActivateNBExtensionApp] CRITICAL | Unknown flag: '--py' 

    Please note that I have jupyter-nbextension on Mac, but I am running a request:

      jupyter-nbextension enable --py widgetsnbextension 

    warning widget not found

    But jupyter nbextension enable widgetsnbextension just throws an error and does nothing. The same error happened when I ran the code.

      import ipywidgetsipywidgets .__ version__ 
      which Jupyter jupyteris /Library/Frameworks/Python.framework/Versions/3.5/bin/jupyterwhich jupyter laptopjupyter-notebook is /Library/Frameworks/Python.framework/Versions/3.5/bin/jupyter-notebook 


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      https: // 

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

    This is a duplicate component for me, probably because I need user config files and I want to switch between some virtual settings (not conda environments). The command using --sys-prefix does not remove the “JavaScript widget not warned, detected” part and the command without it – at least temporarily. At the moment I am unable to reproduce the notification by switching between virtual environments and also by running jupyter notebook (with a small test notebook tqdm.But tqdm_notebook ), I can reproduce this with a real notebook is more impractical. (Also, using some very % matplotlib inline magic for the test notebook also fails to run there, although it appears to be in that notebook after doing a more complex place where it is used by tqdm and results in a warning.)

    As I mentioned @jasongrout , you can remove some male or female config files, then the command with --sys-prefix may work. However, I never know what to remove. I end up with a ~ / .jupyter / file that basically contains a hashed password that most people want to keep using. jupyter --paths with the venv3 environment trigger produces the following output:

    warning widget not found

    I would only remove ~ / .jupyter / nbconfig / notebook.json (which doesn't really matter ~ / venv3 / etc / jupyter / nbconfig / notebook .json )? Are there any packages that I need to reinstall using pip in their respective environments? Do the extensions "activate" anything other than simple Python money transfers, which I might also want to remove somewhere in ~ / .jupyter? If you remove ~ / .jupyter / nbconfig / notebook.json before running the --sys-prefix command, the validation warning will not appear. Just running the command without an additional indicator works, then the level doesn't always work - I'm not a number.


     :    /home/tsbertalan/.jupyter    / home / zbertalan / venv3 / etc / jupyter/ Usr / local / etc / jupyter   / etc / jupyterData:    /home/tsbertalan/.local/share/jupyter    / home / zbertalan / venv3 / share / jupyter    / Usr / local / share / jupyter    / usr / share / jupyterDuration of surgery:     / run / user / 1000 / jupyter 

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