[Tkinter]Validation to multiple Entry widgets

[Beppe]

Il giorno sabato 17 febbraio 2018 20:21:53 UTC+1, Peter Otten ha scritto:
> Beppe wrote:
> 
> > I would validate values input, on key, in multiple Entry widgets create at
> > run time
> > 
> > I wrote this snip but even if the entry are created and the callback work
> > well the relative value is missing
>         
> >         my_list = (2.14,18.3,76.4,2.38,0.425,2.68,1.09,382,8.59,0.495)
> > 
> >         for i in my_list:
> >             #this work
> >             #w = tk.Entry(self,  bg='white')
> >             #this doesn't work
> >             w = tk.Entry(self,  bg='white',  validate = 'key',
> >             validatecommand = self.vcmd) w.insert(tk.END, i)
> >             w.pack()
> > 
> >     def validate(self, action, index, value_if_allowed,
> >                  prior_value, text, validation_type,
> >                  trigger_type, widget_name):
> >         # action=1 -> insert
> 
> When you add
> 
>           print(text)
> 
> here to debug your code the old-fashioned way you'll note that text is, e. 
> g. '2.14' and thus will not pass the `text in ...` test below.

yeah, thank you very much, I change 
if text in '0123456789.-+':
with
if text:
and it works now
thank you, Peter

> 
> >         if(action=='1'):
> >             if text in '0123456789.-+':
> >                 try:
> >                     float(value_if_allowed)
> >                     return True
> >                 except ValueError:
> >                     return False
> >             else:
> >                 return False
> >         else:
> >             return True
> > 
> >    
> > root = tk.Tk()
> > app = Application(master=root)
> > app.mainloop()
> > 
> > 
> > tips?
> > 
> > regards beppe