<OT> tcl/tk question: Radio buttons

[Alan Jackson]

Are you trying to set the checkbutton variable to a string? It is only
allowed to have 1 of 2 values, either 0/1 (the default) or whatever you
define in the -onvalue/-offvalue tags.

On Sun, 21 Dec 2003 20:12:49 -0500
Joel Hammer <joel at hammershome.com> wrote:

> I just want to get this point cleared up before I go off in the wrong
> direction.
> 
> I have found if I change the global variable (-variable) associated with
> a checkbutton, the button stops responding.
> 
> I have included a program snippet below, as I think you can't have
> attachments on this list.
> 
> Basically, when I click a radio button, and run a command like 
> 
>      -command {puts "string"}
> 
> all works as expected. However, if I change the radiobutton option -variable
> in the command, with something like:
> 
>      -command {set cb "You ran a program"}
> 
> the radio button stops responding. cb is my -variable in this radiobutton.
> 
> It makes no difference if I remove the -onvalue and -offvalue options.
> 
> Is this a bug or a feature or am I missing something?
> 
> Thanks,
> 
> Joel
> 
> 
> #!/etc/alternatives/wish -f
> frame .myframe2
> pack .myframe2 -anchor w
> 
> # The command in the next line is the problem
> checkbutton .myframe2.cb -text "Choice 2" -onvalue True -offvalue False -variable cb -command {set cb "You ran a program"}
> 
> # This next line works fine
> # checkbutton .myframe2.cb -text "Choice 2" -onvalue True -offvalue False -variable cb -command {puts "You changed me"}
> 
> label .myframe2.lcb -textvariable cb 
> pack .myframe2.cb .myframe2.lcb -side left 
> 
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