How to get ipywidgets working in Jupyter Lab?

JupyterLab now prefers a model where arbitrary javascript is no longer allowed to be embedded in a cell's output, which is how many interactive Jupyter Notebook modules used to work. They now ask that modules with interactivity create a JupyterLab extension.ipywidgets provides @jupyter-widgets/jupyterlab-manager extension which satisfies this requirement.

When using ipywidgets 7.6 or newer in JupyterLab 3.0 or newer you do not need to do anything: it is installed by default. You can check if this is installed by running:

jupyter labextension list

which should include a line like:

@jupyter-widgets/jupyterlab-manager v3.0.0 enabled OK (python, jupyterlab_widgets)

If you are using JupyterLab 1 or 2 (or old version of ipywidgets) you need to install this extension manually by running this on your command line (which assumes you already have NodeJS installed):

jupyter labextension install @jupyter-widgets/jupyterlab-manager

I had the same pbm, and tried this solution (hope it can help others):

The jupyter labextension install @jupyter-widgets/jupyterlab-manager gave this kind of error in my case:

> /Users/user/.nvm/versions/node/v8.7.0/bin/npm pack @jupyter-widgets/jupyterlab-managerjupyter-widgets-jupyterlab-manager-0.35.0.tgzErrored, use --debug for full output:ValueError:"@jupyter-widgets/jupyterlab-manager@0.35.0" is not compatible with the current JupyterLabConflicting Dependencies:JupyterLab              Extension            Package>=0.15.4-0 <0.16.0-0    >=0.16.0-0 <0.17.0-0 @jupyterlab/application>=1.1.4-0 <2.0.0-0      >=2.0.0-0 <3.0.0-0   @jupyterlab/services>=0.15.4-0 <0.16.0-0    >=0.16.0-0 <0.17.0-0 @jupyterlab/rendermime>=0.15.4-0 <0.16.0-0    >=0.16.0-0 <0.17.0-0 @jupyterlab/notebook

Then, what I did is to use a previous version 0.34 instead of 0.35:jupyter labextension install @jupyter-widgets/jupyterlab-manager@0.34

In fact, according to this, sometime teams get time to consider the last version.

UP (according to comments):You can check jupyter lab --version and find match on its version compatibility.

And it works now !

Had the same issue, and what worked for me today was running the 'clean' command, as mentioned here: https://ipywidgets.readthedocs.io/en/latest/user_install.html#installing-the-jupyterlab-extension

So:

jupyter lab cleanjupyter labextension install @jupyter-widgets/jupyterlab-manager

And that got it working right for me just now.