Genie Discord forum

Is there a way to Observable.connect! a variable from an @app body to an Observable?

Something like this:

using Observables, MyModule

@app begin
    @in variable = 0
end

connect!(MyModule.some_observable, variable)

This is interesting, have you tried doing this inside a handler? Something like

@onchange isready begin connect!(observable, variable) end

Just to give some insight, we use Observable's onto attach callbacks to a variable. The @app macro generates a handlersfunction that attaches the callbacks.

julia> @macroexpand @app Model begin @out i = 10; @onchange i begin; print(i); end end
quote
    #= /Users/pere/.julia/packages/Stipple/a9IBQ/src/ReactiveTools.jl:585 =#
    begin
        #= /Users/pere/.julia/packages/Stipple/a9IBQ/src/ReactiveTools.jl:659 =#
        Stipple.ReactiveTools.delete_events(Model)
        #= /Users/pere/.julia/packages/Stipple/a9IBQ/src/ReactiveTools.jl:661 =#
        function handlers(__model__)
            #= /Users/pere/.julia/packages/Stipple/a9IBQ/src/ReactiveTools.jl:661 =#
            #= /Users/pere/.julia/packages/Stipple/a9IBQ/src/ReactiveTools.jl:662 =#
            #= REPL[57]:1 =#
            begin
                #= /Users/pere/.julia/packages/Stipple/a9IBQ/src/ReactiveTools.jl:842 =#
                on(__model__.i) do i
                    #= /Users/pere/.julia/packages/Stipple/a9IBQ/src/ReactiveTools.jl:843 =#
                    #= REPL[57]:1 =#
                    print(i)
                end
            end
            #= /Users/pere/.julia/packages/Stipple/a9IBQ/src/ReactiveTools.jl:664 =#
            __model__
        end
        #= /Users/pere/.julia/packages/Stipple/a9IBQ/src/ReactiveTools.jl:666 =#
        (Model, handlers)
    end
end

This handlersfunction is called at a later stage when the page's model is instantiated

but would isready be updated only once? Because the connect!ion needs to happen only once..

yes, isready comes by default and changes to true when the page is finished loading. It'll be updated on page reload only

ok!!! awesome. trying it

nah, the observable variable is stripped off inside the scope of @onchange. So in my case it's no longer Observable{Bool} it's just Bool (e.g. false). Then the connect! fails because it connects two observables.

I see, that is right. I guess then we'd have to add the connect! call to the list of functions ( like on) executed when instantiating the model with handlers...I don't know how to do that yet, but I'm currently studying the Stipple source so I might be able to help soon

If this is something you need, please open an issue on the Stipple.jl repo with a MWE and we'll look into it

done: https://github.com/GenieFramework/Stipple.jl/issues/218