Sharing a document between sessions/tabs

Community Support
1

Hi!

First of all, thanks for a great framework – it’s really a pleasure to use.

I have an application that I serve by instantiating a Server and adding it’s show callback to server.io_loop, all that in __main__ of my python file – so I’m not using bokeh serve etc.

It looks something like this:

    class Viewer:
        def __init__(self):
            self.button = widgets.Button(label='Increase')
            self.button.on_click(self.on_click)
            self.val = 0
            self.text = widgets.Div(text=f'{self.val}')
        
        def on_click(self):
            self.val += 1
            self.text.update(text=f'{self.val}')

        def view(self, doc):
            doc.add_root(bokeh.layouts.row(
                self.button,
                self.text
            ))
    
    v = Viewer()
    app = Application(FunctionHandler(v.view))
    server = Server({'/app': app})
    server.start()
    
    server.io_loop.add_callback(server.show, '/')
    server.io_loop.start()

Currently each browser tab creates a new session / doc. Is there a way to share the Document object, similarly to how the panel package does it?

Thanks

2

It is possible to connect to an existing session, but you would have to know the existing session id and specify it as part of the URL as a bokeh-session-id HTTP request argument. This is not a common thing to do at all. Otherwise, new connections always generate new sessions, and sessions always have their own unique Document.