On Sep 22, 4:29 am, Peter Otten <__pete...@web.de> wrote:
> Mike wrote:
> > On Sep 21, 12:47 pm, Peter Otten <__pete...@web.de> wrote:
> >> Mike wrote:
> >> > I'm trying to arrange for an Entry widget to check whether its data
> >> > is all digits and whether the number represented is small enough.
> >> > The validate function seem to be called once at startup and not
> >> > afterwards:
>
> >> > The print statement run 3 times at startup.
> >> > Editing an Entry does not cause any printing.
> >> > Any ideas?
> I don't know Tcl either; the following is the first thing that seemed to
> work, after some trial and error:
>
> import Tkinter as tk
>
> def validate(before, after):
> print before, "-->", after
> return after.isdigit()
>
> if __name__ == "__main__":
> root = tk.Tk()
> name = root.register(validate)
> cmd = 'expr {[%(name)s %(parms)s]}' % dict(name=name, parms="%s %P")
> var = tk.StringVar()
> entry = tk.Entry(root, textvariable=var,
> validate="all", validatecommand=cmd)
> entry.pack()
> entry.focus_set()
> root.mainloop()
Thanks.
It worked.
I discovered that None is not an acceptable substitute for False.
If validate returns None, it quits being called.
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