Hi .
I am currently using the treeview shown here:
https://www.w3schools.com/howto/howto_js_treeview.asp
and it works fine in my place.
The code is so compact and tiny so it actually appears little obfuscated .
How can i add a "expand/collapse" all button ?
How can i save/remember the expanded not set when having php/python in the background ?
Thank you for your hints