Altering Select options dynamically

[leemthai]

I wanted to add a bit of text to the currently selected Select menu item to indicate its status.

e.g. "Item 1" -> "Currently selected: Item 1"

The only way I can think of right now to achieve this is to call set_options() whenever the selected item changes. i.e. in Select.Changed

However, this has the unfortunate effect of creating some kind of infinite loop... and I can't figure out why. Maybe something to do with 'blanks' etc.

Uppdate: I just read this for set_options():
"This will reset the selection."
That sounds particularly bad for my idea. Resetting the selection when a selection has just been made..

But anyway, just wanted to know if:

1. Calling set_options() from inside on_select_changed is allowed, generally.
2. If there is a better way to alter the display text for the currently selected menu option?

Cheers,

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[TomJGooding]

Select is unfortunately one of those widgets that can be difficult to customise without looking under the hood.

Can I just double-check, I assume you only want to change the text in the 'current' display, rather than the option in the dropdown?

[leemthai]

Yes, the text the viewer sees on-screen. Thanks

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[leemthai]

Oops, apologies, tired eyes "Closed with comment" rather than just "Comment" :-)

[TomJGooding]

This is maybe a bit hacky but probably the simplest way:

from textual.app import App, ComposeResult
from textual.types import NoSelection
from textual.widgets import Select
from textual.widgets._select import SelectCurrent


class ExampleApp(App):
    def compose(self) -> ComposeResult:
        yield Select([(f"Item {i}", i) for i in range(1, 11)])

    def on_select_changed(self, event: Select.Changed) -> None:
        if isinstance(event.value, NoSelection):
            return
        select_current = event.select.query_one(SelectCurrent)
        select_current.update(f"Currently selected: {select_current.label}")


if __name__ == "__main__":
    app = ExampleApp()
    app.run()

[leemthai]

Yeah, that works, thanks.

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