Creating an edge dragging a line from first node to the second

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I didn’t find information about if Bokeh allows a user to connect two nodes interactively dragging a line from one node to another.

Is there such a feature, event? I could add an event handler to create an edge on a server side.

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@kvdm.dev you can respond to UI events (e.g. pan/drag) either JS or Python callbacks (if a Bokeh server application). Docs for JS callbacks for UI events are here:

but pretty much everything there applies to Python callbacks in a Bokeh server app, with js_on_event replaced by on_event.

Note: that is a link specifically to the 2.4.3 docs rather than “latest”, since the User’s Guide is about to be completely restructured with the upcoming 3.0 release.

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Ok. And how would you recommend to update a UI component from a server side after handling an event?

automatically push server-side updates to the UI (i.e. widgets or plots in a browser)
https://docs.bokeh.org/en/2.4.3/docs/reference/server.html

Is it automatic?

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Synchronization of all Bokeh model properties is automatic, and the UI will be update as appropriate. So, e.g. assign slider.value = new_value and the slider will update.

There is lots of information in the docs:

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