Does not work on MacOS

[ruidazeng]

Jupyter notebook version: latest, just brew installed it.

Installation in Jupyter notebook

# Install matplotlib for data visualization
%matplotlib 
!pip install matplotlib

!pip install ipywidgets

Usage:

interact(plot_distribution, year=widgets.IntSlider(min=1, max=10, step=1, value=2))

It shows this as an output instead of a functioning slider:

interactive(children=(IntSlider(value=2, description='year', max=10, min=1), Output()), _dom_classes=('w…
<function __main__.plot_distribution(year)>

[baggiponte]

Same for me. I tried this:

cd "$(mktemp -t scratch --directory)"
uv init --name=test --python=3.12
uv add --dev jupyterlab ipywidgets

then wrote

from ipywidgets import IntSlider

slider = IntSlider()

print(slider.value ** 2)

Got:

My user agent is: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36' I am on Arc but get the same problems on Chrome and Safari.

[manzt]

then wrote

In order to see the widget it must be the last item in the cell or explicitly displayed with display(slider). Try breaking up your example into two cell blocks

from ipywidgets import IntSlider

slider = IntSlider()
slider

print(slider.value ** 2)

[dcurrie]

I was able to fix this by installing jupyterlab_widgets into the same python environment as jupyterlab.

In my case, the kernel I am running is in a separate environment from jupyterlab's, and it had ipywidgets installed, but the plugin for jupyterlab is needed in its environment.

Also, I'd used homebrew to install python and jupyterlab, and it has no formula for jupyterlab_widgets. So I had to force the issue with pip3 install --user --break-system-packages jupyterlab_widgets

Neither of these things may be affecting you, but it may be a good idea to confirm that your jupyter has the appropriate plugin.