how to bind a key with textfield

[plugeit]

please reply how to bind a key for example enter key with textfield

[FeodorFitsner]

Could you please elaborate what do you mean or what are you trying to achieve?

[plugeit]

see what i am trying to achieve is you are writing in a textfield and while doing that you press a key ex: you press 'q' key so it should run a program

[davabase]

You can handle global keyboard events with the page.on_keyboard_event callback, see the docs here: https://flet.dev/docs/guides/python/keyboard-shortcuts/

If you want the keyboard event to only work if the TextField is highlighted you'll have to add a variable that is set to True with the on_focus callback of your TextField and set to False with the on_blur callback of your TextField. The you can check that the variable is set before running your program, see the docs here: https://flet.dev/docs/controls/textfield/#on_focus

text_field_in_focus = False

def on_focus_callback(_):
    global text_field_in_focus
    text_field_in_focus = True

def on_blur_callback(_):
    global text_field_in_focus
    text_field_in_focus = False

def run_program(event: ft.KeyboardEvent):
    if event.key == 'Q' and text_field_in_focus:
        print("Run program!")

page.add(
    ft.TextField(on_focus=on_focus_callback, on_blur=on_blur_callback)
)

page.on_keyboard_event = run_program

Alternatively if the key is a printable character you can check the on_change callback for the TextField, some docs: https://flet.dev/docs/controls/textfield/#textfield-with-on_change-event

# Check if the last character entered in a TextField is 'q'.
def on_change_callback(event):
    if event.control.value[-1].lower() == 'q':
        print("Run program!")

page.add(
    ft.TextField(on_change=on_change_callback)
)

I highly recommend taking a bit of time to read through the docs, they are very good and can answer many questions quickly.
https://flet.dev/docs/controls