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I'm working on creating a server-side extension in JupyterLab and have been searching for quite a while for a way to get the currently active notebook name inside my index.ts file. I found this existing extension that gets the currently active tab name with ILabShell and sets the browser tab to have the same name. In my case I'll be triggering the process with a button on the notebook toolbar so the active tab will always be a notebook. However, when I try to use the code in the activate section of my extension, I get TypeError: labShell.currentChanged is undefined where labShell is an instance of ILabShell. That extension doesn't support JupyterLab 3.0+ so I believe that's part of the problem. However, currentChanged for ILabShell is clearly defined here. What if anything can I change to make it work? Is there another way to accomplish what I'm trying to do? I'm aware of things like this to get the notebook name inside the notebook but that's not quite what I'm trying to do.

Windows 10,
Node v14.17.0,
npm 6.14.13,
jlpm 1.21.1,
jupyter lab 3.0.14

I'm using this example server extension as a template: https://github.com/jupyterlab/extension-examples/tree/master/server-extension

index.ts file from the existing extension to get the current tab name:

I have the following graphs/outputs from VSCode, VSCode-Insiders and Jupyter Lab respectively.

VSCode

VSCode-Insiders

Jupyter Lab

I want to change the looks of the slider that you see at the bottom.

Basically I want to remove the text and number and change the looks of the slider knob and its position to be in the center relative to the image.

My thought process is that, since VSCode is an electron app and Jupyter Lab runs in a browser so it should be possible to modify that single output cell with a custom targeted CSS.

As an example I have the following that works perfectly in all 3 setups and changes the CSS of the output cell by coloring the text, which tells me that it may be possible to do what I want with the slider element too -

I have a set of code which I have compiled without any errors. The code is supposed to select an image file from the local directory and upload to a JTextArea using JFileChooser and JLabel. But upon runtime, the image selected isn't displaying.

Below is the code snippet.

I am using some JLab Bluetooth earbuds that the box says are Bluetooth 4.2 (OSX reported it as 4.1). This should qualify it as BLE (I think). I am unable to get them to show in any form of BLE scans. Please see below for the list of things I've tried.

• I have tried manually scanning in code and using BLE scanner applications.
• I have tried scanning before and after pairing.
• I have tried on iOS, Android, and Mac.

The native OS Bluetooth connection tools see it and connect as expected, so I don't believe there is anything wrong with the hardware.

My assumption at this point is that they are still "regular" Bluetooth and not BLE (even though they are 4.x).

To summarize, the questions are:

1. Why are the headphones not showing up in scans
2. Will all Bluetooth headphones act the same/are other people about to see Bluetooth headphones in BLE scans?