Displaying message before closing the child window or application

Tkinter showing message before closing the window or terminating the application using protocol

Using protocol

Here the function my_msg() is executed once we try to close the window.

my_w.protocol('WM_DELETE_WINDOW', my_msg)

Inside the function my_msg() we kept the code to display the message box ( commented line ) or we show a message for 3 seconds before closing the window.

import tkinter as tk
from tkinter import * 
import tkinter.messagebox as msgbox
my_w = tk.Tk()
my_w.geometry("400x200")  # Size of the window 
my_w.title("www.plus2net.com")  # Adding a title

# create one label 
l1 = tk.Label(my_w,  text='Welcome' )
l1.grid(row=1,column=2) 

b1 = tk.Button(my_w, text='Clik me to Close',
               command=lambda:my_msg())
b1.grid(row=2,column=2) 
def my_msg():
        #msgbox.showinfo(title='', message='Thank You') #message box
        l2=tk.Label(my_w,text='Thank you')
        l2.grid(row=2,column=3) # show message in grid
        my_w.after(3000, my_w.quit) # close window after 3 seconds
my_w.protocol('WM_DELETE_WINDOW', my_msg)    

my_w.mainloop()

Using child window

import tkinter as tk
from tkinter import * 
import tkinter.messagebox as msgbox
my_w = tk.Tk()
my_w.geometry("400x200")  # Size of the window 
my_w.title("www.plus2net.com")  # Adding a title

# create one label 
my_str = tk.StringVar()
l1 = tk.Label(my_w,  textvariable=my_str )
l1.grid(row=1,column=2) 
my_str.set("Hi I am main window")

b1 = tk.Button(my_w, text='Clik me to open new window',
               command=lambda:my_open())
b1.grid(row=2,column=2) 

def my_open():
    my_w_child=Toplevel(my_w) # Child window 
    my_w_child.geometry("400x200")  # Size of the window 
    my_w_child.title("www.plus2net.com")

    l1 = tk.Label(my_w_child,  text='I am child window' )
    l1.grid(row=1,column=2) 
    def my_msg():
        #l2=tk.Label(my_w_child,text='Thank you')
        #l2.grid(row=2,column=2)
        #my_w_child.after(3000, my_w_child.quit)#close after 3 seconds
        msgbox.showinfo(title='', message='Thank You') # show message
        my_w_child.destroy()
    my_w_child.protocol('WM_DELETE_WINDOW', my_msg) 
my_w.mainloop()

Toplevel Passing data from Parent window to Child window

Python Tkinter Dictionary Python- Tutorials

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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Message before Closing Child window

Using protocol

Using child window

Subhendu Mohapatra