Re: Tkinter GUI Error

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From	Christian Gollwitzer <auriocus@gmx.de>
Newsgroups	comp.lang.python
Subject	Re: Tkinter GUI Error
Date	Tue, 14 Jan 2014 22:33:23 +0100
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Am 14.01.14 22:27, schrieb Lewis Wood:
> Also anyone know how to create an entry box for Tkinter where you can only enter in 2 digits?
>
You must use a validator to achieve this. This is a more advanced topic 
though. A validator is a function that is called whenever the user keys 
something in - even by copy/pasting - and has to decide, whether this 
change is accepted or not. It is relatively easy to annoy your users if 
the validator is not written carefully. For instance, you must always 
accept th eempty string, otherwise the users won't be able to delete 
everything - very annoying behaviour.

See for example this SO question

http://stackoverflow.com/questions/4140437/python-tkinter-interactively-validating-entry-widget-content

	Christian

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Thread

Tkinter GUI Error fluttershy363@gmail.com - 2014-01-13 10:49 -0800
  Re: Tkinter GUI Error Lewis Wood <fluttershy363@gmail.com> - 2014-01-13 10:51 -0800
  Re: Tkinter GUI Error Christian Gollwitzer <auriocus@gmx.de> - 2014-01-13 20:03 +0100
    Re: Tkinter GUI Error Lewis Wood <fluttershy363@gmail.com> - 2014-01-13 11:21 -0800
  Re: Tkinter GUI Error Peter Otten <__peter__@web.de> - 2014-01-13 20:36 +0100
  Re: Tkinter GUI Error Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-01-13 20:39 -0500
  Re: Tkinter GUI Error Rick Johnson <rantingrickjohnson@gmail.com> - 2014-01-13 18:47 -0800
  Re: Tkinter GUI Error Chris Angelico <rosuav@gmail.com> - 2014-01-14 14:12 +1100
    Re: Tkinter GUI Error Lewis Wood <fluttershy363@gmail.com> - 2014-01-14 11:11 -0800
      Re: Tkinter GUI Error Lewis Wood <fluttershy363@gmail.com> - 2014-01-14 13:27 -0800
        Re: Tkinter GUI Error Christian Gollwitzer <auriocus@gmx.de> - 2014-01-14 22:33 +0100

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