Connect a variable integer to a radio button value

Question

I am trying to make a program which could use a standard load by clicking the standload radiobutton or a variable load by clicking the variable load radiobutton. This variable load can be chosen by filling in a entry. Unfortunetely, I am not able to load the entry value directly into the value for the radiobutton. If I select the standard load it is working, but for the variable load I always obtain zero. Can someone show me what I am doing wrong? Thank you in advance!! The following code is what I have:

selectedload = tk.IntVar()

rad_standload = ttk.Radiobutton(tab1, text='Standard load (20 kN/m2)', value=pfloor,      variable=selectedload)
rad_standload.grid(row=17, column=1, sticky='W')

entry_int_frload = tk.IntVar()
entry_frload = ttk.Entry(master = tab1, textvariable = entry_int_frload)
entry_frload.grid(row=17, column=3, sticky='W')

rad_standloadfr = ttk.Radiobutton(tab1, text="Distributed load [kN/m2]:", value=entry_int_frload.get(),   variable=selectedload)
rad_standloadfr.grid(row=17, column=2, sticky="E")

I tried to create a function to put the .get() function in, but it is still not working. Hope that someone knows the answer.

This isn't very clear. You mentioned that you attempted to resolve this with a function, but there isn't a function in your example. It's better to provide a [minimal reproducible example](https://stackoverflow.com/help/minimal-reproducible-example) so that we can copy and paste your failed attempt. It's likely that you are calling the `get` method too soon before a value is bound to your `IntVar`. — Rory, Jun 20 '23 at 14:55
https://ibb.co/xXzyL93. The grid isn't correct layout. the correct is rad_standload.grid(row=0, column=1, sticky='W') entry_frload.grid(row=0, column=3, sticky='W') rad_standloadfr.grid(row=0, column=2, sticky="E"). But what is pfloor is? — toyota Supra, Jun 21 '23 at 11:30
You will have to write two functions Standard_load and Distributed_load. — toyota Supra, Jun 21 '23 at 11:35

score 0 · Answer 1 · answered Jun 21 '23 at 02:14

You can trace the tkinter variable entry_int_frload and update the value option of rad_standloadfr:

def update_rad_standloadfr(*args):
    try:
        # change the value option of rad_standloadfr
        rad_standloadfr.config(value=entry_int_frload.get())
    except tk.TclError as ex:
        print(ex)

# call update_rad_standloadfr() whenever entry_int_frload is changed
entry_int_frload.trace_add("write", update_rad_standloadfr)

Note that rad_standloadfr will be deselected if it is currently selected after changing its value option.

Connect a variable integer to a radio button value

1 Answers1