Add examples on broadcasting variables to subset of states

[maxHeez]

Description
I could not find other documentation than that to broadcast variable values.

I am managing a location variable pointing to a country or region in the world. In my application I have another variable named information. I want all the other states sharing the same location value as mine to share the same information value as well.
How to broadcast a variable value to a subset of states?

def state_filter(source_state, other_state):
    if other_state["location"] == source_state["location"]:
        return True
    return False

broadcast("information", value, state_filter)

[FlorianJacta]

Thank you for the issue; this could greatly improve the documentation. I think it is not exposed yet

[FredLL-Avaiga]

As far as I know, this is not supported yet 🥲

cf. taipy #1207

[FlorianJacta]

I am putting this as blocked by Avaiga/taipy#1207

[maxHeez]

Ok. Is this something scheduled for the next Taipy version? Or do you have a workaround?

[FlorianJacta]

There are no workaround available now. What you could do is to have the filter after broadcasting it to all the users

[maxHeez]

I can see some PRs are closed on this topic.
Any update? Any documentation to help on this?

[FlorianJacta]

This has been done in develop. There needs to be more documentation.
This works by broadcasting a callback to every client; inside this callback, the developer decides what to do.

https://docs.taipy.io/en/develop/refmans/reference/taipy.gui.Gui/#taipy.gui.Gui.broadcast_callback

def a_callback(state):
    gui= state.get_gui()
    gui.broadcast_callback(your_callback_sent_to_everyone, [state.location])



def your_callback_sent_to_everyone(state, args):
    source_location = args[0]
    if source_location == state.location:
        ... # do what you want