Clear contents of a frame when function is called

Question

My program creates different widgets depending on the selection from a radio button. Everything works great except I can't seem to clear the old widget if the other radio button is selected. The suggestion here: (https://stackoverflow.com/a/15995920/3924118) isn't working. Here's the relevant code.

From the main program:

root = Tk()
mainframe = ttk.Frame(root, padding="3 3 12 12")
mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
mainframe.columnconfigure(0, weight=1)
mainframe.rowconfigure(0, weight=1)
secondframe = ttk.Frame(mainframe)
secondframe.grid(column=4, row=3)
secondframe.columnconfigure(0, weight=1)
secondframe.columnconfigure(0, weight=1)

And then the function:

def pct_from_duration():
    """ Calculate needed pct from target duration"""
    tgt_dur_entry = ttk.Entry(mainframe, width=4, textvariable=tgt_dur_inp)
    tgt_dur_entry.grid(column=5, row=3, sticky=(W, E))
    for widget in secondframe.winfo_children():
        widget.destroy()
    ttk.Label(secondframe, textvariable=pct_bond_end).grid(column=1, row=1)
    ttk.Button(mainframe, text="Calculate", command=calculate).grid(column=5, row=4, sticky=W)

FWIW, I get no error message, it just doesn't actually delete the widgets. This is all python 3.6.

No strict need to add words such as "Python" or "tkinter" to the title of the question. For this purpose, tags can be used. — nbro, May 17 '18 at 09:41

kavko · Answer 1 · 2018-05-17T10:56:27.397

Maybe this will help...I'ts an example of your function and it is working(Python 3.5)

import tkinter as tk
from tkinter import *
from tkinter import ttk

class GUI:

    def __init__(self, master):

        def pct_from_duration():
            tgt_dur_entry = ttk.Entry(mainframe, width=4)
            tgt_dur_entry.grid(column=5, row=3, sticky=(W, E))
            for widget in secondframe.winfo_children():
                widget.destroy()
            l3 = ttk.Label(secondframe, text = 'Label').grid(column=1, row=1)
            b2 = ttk.Button(mainframe, text="Calculate").grid(column=5, row=4, sticky=W)

        self.master = master
        mainframe = ttk.Frame(master)
        mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
        mainframe.columnconfigure(0, weight=1)
        mainframe.rowconfigure(0, weight=1)
        secondframe = ttk.Frame(mainframe)
        secondframe.grid(column=4, row=3)
        secondframe.columnconfigure(0, weight=1)
        secondframe.columnconfigure(0, weight=1)
        l = Label(secondframe, text = 'Child_mainframe')
        l.grid()
        l2 = Label(mainframe, text = 'Child_secondframe')
        l2.grid()
        r1 = Radiobutton(master, text="Radiobutton", value=1, command = pct_from_duration).grid()

root = Tk()
root.rowconfigure(0, weight = 1)
root.columnconfigure(1, weight=1)
root.columnconfigure(0, weight=1)
root.columnconfigure(0, weight=2)
my_gui = GUI(root)
root.mainloop()

If I'm not missing something, the main thing you did differently was put the whole thing in a class. What advantage is doing it this way? — Tom, May 19 '18 at 13:28

Clear contents of a frame when function is called

1 Answers1