Radio Buttons

[Silent1Mezzo]

I have two radiobuttons: onRadio and offRadio....Whe n the program loads I want the onRadio button to be selected. How do I do this?

I've tried:
onRadio.select( ) but this does nothing.

[bartonc]

I have two radiobuttons: onRadio and offRadio....Whe n the program loads I want the onRadio button to be selected. How do I do this?

I've tried:
onRadio.select( ) but this does nothing.

Depends on which GUI Toolkit you're using. I see that you are a .NETer; new to python?

[Silent1Mezzo]

Depends on which GUI Toolkit you're using. I see that you are a .NETer; new to python?

New to python. Experienced at .NET

I'm using the TK GUI toolkit

[bartonc]

New to python. Experienced at .NET

I'm using the TK GUI toolkit

That would be "Tkinter" in python.
To group radio buttons in Tkinter you must associate something I like to call a Tk PyVar. This variable (common to all buttons in a group) is automaticly updated when the buttons are push and setting it programmaticall y sets the buttons. It can be an integer or a string.
For info, see this link:
radio button patterns

[bartonc]

New to python. Experienced at .NET

I'm using the TK GUI toolkit

I'm curious; are you just checking python out; trying to find something easier than .NET; have you heard of MS's IronPython (sort of a marriage between python and .NET, from what I understand)?

[Silent1Mezzo]

That would be "Tkinter" in python.
To group radio buttons in Tkinter you must associate something I like to call a Tk PyVar. This variable (common to all buttons in a group) is automaticly updated when the buttons are push and setting it programmaticall y sets the buttons. It can be an integer or a string.
For info, see this link:
radio button patterns

I have the radio buttons working my problem is that I need one of them preselected when the program loads....and the .select() isn't working

onRadio = Radiobutton(onOff, text = "On", value = 0, variable = v)
onRadio.pack(side = BOTTOM, anchor = S)
onRadio.select()

This should select the onRadio but it doesnt.

[bartonc]

I have the radio buttons working my problem is that I need one of them preselected when the program loads....and the .select() isn't working

onRadio = Radiobutton(onOff, text = "On", value = 0, variable = v)
onRadio.pack(side = BOTTOM, anchor = S)
onRadio.select()

This should select the onRadio but it doesnt.

v = StringVar()
v.set("On")  # or whatever you want the default to be
onRadio = Radiobutton(onOff, text = "On", value = 0, variable = v)
onRadio.pack(side = BOTTOM, anchor = S)
 

select() may work on buttons with no variable associated with them, I don't remember. Once you have the variable, use it to control the group. It makes sense since the other buttons need to be informed of the change and act accordingly (and this is ALL that they have in common).

I should point out that Tk is only very basic and useful for cross-platform development (to a point) because it "comes with" most python installations. There are other cross platform Gui ToolKits which do deliver a native look on Windows and *nix and Mac and have much more intuitive contructors and vast library of widgets. The first think most people notice when developing with Tkinter is that there is no ComboBox widget. Some tree widget support and D&D support has be kluged onto it, but if you look at the source code for IDLE, you'll find that the Text widget in Tk never did work very well. It is a good place for beginners to start, but anyone familiar with an overloaded environment like .NET will find it lacking in a hurry.