disable button when TextInput is empty

[Glen Rubin]

I want to enable/disable a button depending on whether there is text present in a TextInput

I tried something like: 

TextInput:

    id: login

Button:

    disabled: not login.text

but then i get the error:

 AttributeError: module 'login' has no attribute 'text'

I guess b/c there is no text the attribute doesn't exist yet?  maybe i need to do this from python?

[Elliot Garbus]

Perhaps the attribute is not created at the time of the test.  Initialization order can be confusing.

 

Share an executable example that shows the problem.

 

I put together a small example – but it works as expected.

 

from kivy.app import App
from kivy.lang import Builder

kv = """
BoxLayout:
    orientation: 'vertical'
    AnchorLayout:
        TextInput:
            id: login
            size_hint: None, None
            size: 400, 30
    Button:
        text: 'Text Box Controlled'
        size_hint_y: None
        height: dp(48)
        disabled: not login.text
"""


class TextButtonApp(App):
    def build(self):
        return Builder.load_string(kv)

TextButtonApp().run()

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[Glen Rubin]

i figured out what was going on here.  at the top of my kv file i import the python file login as login and so that name at load conflicted with the login id assigned to the textinput.  I changed the login id and it works fine just like your example!  thanks again!

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[Elliot Garbus]

👍

Sent from my iPhone

On Jan 22, 2023, at 8:37 AM, Glen Rubin <rubi...@gmail.com> wrote:



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