All the async demos are broken

[s22chan]

see https://panel.holoviz.org/user_guide/Async_and_Concurrency.html

possibly related to #4240 and #3882

[SarahG-579462]

Specifically, for the concurrency demo, they seem to work for me in my jupyter notebook, but not on my panel.show()

[SultanOrazbayev]

And they seem to work when using .servable() and executing via panel --show.

[philippjfr]

Thanks everyone, so to be clear the only scenario where they don't work is when using .show() from a notebook?

[SultanOrazbayev]

I'm using this as standalone scripts. Here's a reproducible example (requires one pip install):

# assume this is in file app.py
import panel as pn
import param

# pip install ipyaladin==0.2.1
from ipyaladin import Aladin

pn.extension(
    "ipywidgets",
)


class Test(param.Parameterized):
    def __init__(self):
        super().__init__()

        # add ipyaladin view
        self.aladin = Aladin(
            target="12 25 41.676 +12 48 37.81",
            show_coo_grid=True,
            coo_frame="icsr",
            fov=1,
        )

    def ipyaladin_view(self):
        return pn.panel(
            self.aladin,
            defer_load=True,
            width=800,
        )


app = pn.template.BootstrapTemplate()
app.main.append(Test().ipyaladin_view)
app.show()

If I run the above with:

python app.py
# AttributeError: 'DummyComm' object has no attribute 'kernel'

If I change the last line in the snippet to app.servable() and run it via panel serve --show app.py, it works fine. (Sometimes I get a javascript error, but it usually disappears after refresh or two.)

[philippjfr]

@SultanOrazbayev Yeah, that can't work. If you run the app as a regular script ipywidgets has no idea that it is running inside a Panel app, for this to work you should rewrite it to:

def app():
    app = pn.template.BootstrapTemplate()
    app.main.append(Test().ipyaladin_view)
    return app

pn.serve(app)

[philippjfr]

Cannot really reproduce any other issues here, at least on main.

[philippjfr]

If this persists please reopen with precise step-by-step instruction to reproduce.

[s22chan]

by can't repro, do you mean you can goto https://panel.holoviz.org/user_guide/Async_and_Concurrency.html and interact with any of the widgets and something happens?

[hoxbro]

You should go to the dev website: https://pyviz-dev.github.io/panel/how_to/callbacks/async.html

[s22chan]

that one works for you? same issue for me, none of the buttons or sliders do anything (on multiple browsers)

[MarcSkovMadsen]

Is it because something's get cached in the browser, so people also have different experiences?

[MarcSkovMadsen]

On my iPhone the dev docs example keeps loading aiohttp forever

[hoxbro]

I added aiohttp to dependencies without testing it, but it is not supported in Pyodide aio-libs/aiohttp#7253.