hi all, 

I’m trying to build something similar to ipywidgets but to the GoNB kernel 
(a Go kernel) <https://github.com/janpfeifer/gonb>, and I’m trying to 
figure out how to communicate from Javascript in the notebook to the kernel.

Any pointers ?

The Kernel Message protocol suggests that one can use custom messages 
<https://jupyter-client.readthedocs.io/en/latest/messaging.html#custom-messages>
 (using 
"Comm" channels, using the Shell socket on the kernel, and presumably the 
IOPub in the Frontend)  for that. I also saw these messages passing by when 
playing ipywidgets (in Python) and looking at the debug output of 
JupyterLab.

But how from Javascript (from an HTML widget) I tell Jupyter notebook to 
send these messages to the kernel ? 

Any pointers to documentation, or example source code I can get started ?

many thanks!

ps.: This is a repost from an old question in Jupyter Forum 
<https://discourse.jupyter.org/t/how-in-javascript-to-send-a-comm-info-to-the-kernel/18620>,
 
for which I didn't get a reply (maybe wrong topic?)

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