Ensure refs can be updated by watcher of the same parameter

[philippjfr]

@hoxbro Please test and if possible add your test case.

[hoxbro]

It does not currently work for my case:

screenrecord-2024-04-02_16.35.19.mp4

import panel as pn
import param

pn.extension(notifications=True)

class T(param.Parameterized):
    lst = param.List(allow_refs=True, allow_None=True)

    @param.depends("lst")
    def test(self):
        items = [pn.widgets.TextAreaInput(value=str(i)) for i in range(5)]
        with param.discard_events(self):
            self.lst = pn.rx(items).rx.resolve()
        return pn.Column(*items)


t = T()

pn.widgets.Button(name="print", on_click=lambda e: pn.state.notifications.info(str(t.lst))).servable()
pn.panel(t.test).servable()

[philippjfr]

Oh, that's not surprising, in fact that's the correct behavior, because what you're doing in that example is effectively resetting the lst list every time. If you don't want to do that you need to initialize the widgets given the lst values:

    @param.depends("lst")
    def test(self):
        lst = self.lst or range(5)
        items = [pn.widgets.TextAreaInput(value=str(i)) for i in lst]
        with param.discard_events(self):
            self.lst = pn.rx(items).rx.resolve()
        return pn.Column(*items)

[hoxbro]

Thank you. I will test it later.