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Showing content from https://github.com/qutip/qutip/issues/2475 below:

HTML progress bar is broken in Jupyter notebooks · Issue #2475 · qutip/qutip · GitHub

Qutip's HTMLProgressBar seems not to function any more in jupyter notebooks. Perhaps since "jupyterlab" was introduced.

import qutip as qt
import numpy as np
qt.mcsolve(qt.sigmax(), state=qt.basis(2, 0), tlist=np.linspace(0, 5, 100), c_ops=[qt.sigmam()], ntraj=100, options={'progress_bar': 'html'})

[[ empty progress bar ]]
Javascript Error: $ is not defined
Javascript Error: $ is not defined
Javascript Error: $ is not defined
Javascript Error: $ is not defined
...

There should be no error and the progress bar should display the progress.

"About Jupyter Notebook" shows version 7.2.1.

QuTiP Version:      5.1.0.dev0+487e4ec
Numpy Version:      2.0.0
Scipy Version:      1.13.1
Cython Version:     3.0.10
Matplotlib Version: 3.8.4
Python Version:     3.12.4
Number of CPUs:     20
BLAS Info:          Generic
INTEL MKL Ext:      False
Platform Info:      Linux (x86_64)

The weird thing is that $() actually is available, as one can see in the developer console.

Relevant stackoverflow discussions:

• https://stackoverflow.com/questions/72316844/jupyter-notebook-jupyternotify-javascript-error-is-not-defined
• https://stackoverflow.com/questions/22004386/notify-when-execution-command-is-completed (in comments to top answer)

Thanks to Hussein Shiri for pointing this bug out on the mailing list.

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