Can't select multiple cells in Jupyterlab notebook

user_4931852 0
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I cannot select multiple (adjacent) cells (in order to e.g. delete them)

I have tried

  • Shift +up/down arrows
  • Shift + J/K
  • Both of the above in both Edit mode and Command mode
  • Running a javascript keyboard tester to make sure shift J/K not being intercepted
  • Windows on-screen keyboard for shift +up/down/J/K
  • Online searching for same symptoms

Question: any ideas why this is happening and how to resolve it or how to perform a more detailed investigation/diagnosis?

Environment: Windows-10 Home 64-bit 20H2; Jupyterlab 3.0.5; Python 3.8.6 | packaged by conda-forge | (default, Dec 26 2020, 04:30:06) [MSC v.1916 64 bit (AMD64)]; IPython 7.18.1

Browsers tested Chrome, Opera, Edge (Chrome has security extensions, all disabled/allowing localhost, but Edge is vanilla and behaved exactly the same)

Starting jupyterlab from Anaconda Navigator launcher

jupyter-lab jupyter-notebook
2 Answers

The problem is not with selection per se, as all selection actions failed (e.g. select all cells from menu), but rather with the display

The CSS value for var(--jp-notebook-multiselected-color) was #e3f2fd - invisibly faint on my monitor; it was declared in the index.css file as "md-blue-50" (Google's Material Design blue) but the colour displayed did not match an online sample of md-blue-50 (so I guess the value for md-blue-50 declared elsewhere was not found).

The issue was identified by switching to to dark mode, where selection highlighting was clearly present.

Solution (because I can't find the source of the md-blue-50 value) was simply to use Stylebot to override the background color - in fact, using Stylebot scoped to localhost is better for me because I don't have to fix the css in every installation of jupyterlab in every Python environment.

user_49318520

try to open the jupyter-lab from the cmd, type this command :

jupyter notebook

it will open the same lab you can open via anaconda. then all of shortcuts will work as usual

user_64622850
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