Send alert to user on websocket disconnect

I would like to have a popup appear over the screen to inform the user that the session is no longer available if there’s been a websocket disconnect, similar to what’s shown here:

Screen Shot 2021-10-08 at 4.44.24 PM3808×2418 437 KB

I’m wondering if anyone has any ideas for how this can be done using Bokeh server. This obviously can’t be done with the on_session_destroyed() lifecycle hook, since that doesn’t get called until after the session was also disconnected. I’m supposing I’d have to write some independent JavaScript code…any hints for how I could start looking into how to do this?

Just FYI, in the example given above, the code to call that popup is written in line 183 of phoebe2-ui/App.js at 88ac87e324252229d610850805f8bb2a7172390d · phoebe-project/phoebe2-ui · GitHub. However, that app uses React, not Tornado.

This is still currently an open issue:

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