Is there a way to update a components properties based on its value?

[rohitsathish]

Lets say we're trying to validate text written in TextField. Based on the output we might want to set some values to properties like helper_text or error_text. Is there a way to do that?

Here is my naive attempt that doesn't work. I might be making a Python and not Flet error.

class SearchField(UserControl):
    def __init__(self):
        super().__init__()
        self.helper_text = None

    def build(self):
        trakt_id_field = TextField(
            label="Trakt ID",
            border_color=ft.colors.WHITE,
            color=ft.colors.WHITE,
            cursor_color=ft.colors.WHITE,
            text_size=12,
            on_change=self.check_user,
            helper_text=self.helper_text,
        )

        return trakt_id_field

    def check_user(self, e):
        status_code = req.get(trakt_url + f"users/{e.data}", headers=headers).status_code
        if e.data != None and status_code == 200:
            self.helper_text = "Success"

[ndonkoHenri]

Could you please share a better and simple code sample I could test?