Setting default value of a checkbutton in a menu to True

Question

Goal

I am creating a menu inside an application. In that I want a radiobutton. And by default I want the radiobutton, to be in the on state.

Research

I found how to add the radiobutton using the options.add_radiobutton() command here TKinter effbot . But I still don't know which of the options needs to be used so that in the default it is set to on.

Code

optionsmenu = Menu(menubar,tearoff=0)

optionsmenu.add_radiobutton(label='Pop Up set to on??',command=self.togglePopUp)

code for self.togglePopUp:

def togglePopUp(self,event=None):
    if self.showPopUp:
        self.showPopUp = False

    else:
        self.showPopUp = True

I will initialise self.showPopUp as True.

Please Help me with setting the radiobutton to the on position in the default mode.

Answer 1

If you want to toggle boolean values, I suggest you to use add_checkbutton() instead of add_radiobutton().

With the radiobutton you only have a static value option, which does not change when the entry is clicked. On the other hand, checkbuttons allow you to change between the onvalue and offvalue options.

self.var = IntVar(root)
self.var.set(1)
optionsmenu.add_checkbutton(label='Pop Up set to on??', command=self.togglePopUp,
                            variable=self.var, onvalue=1, offvalue=0)

Note that the IntVar you have to use as variable for the meny entry can replace the self.togglePopUp variable.