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Contents
Python Tkinter – Call Function on Button Click
When a Tkinter Button is clicked, you can call a function using command option. Assign the command option with the function name you would like to call when the button is clicked.
Pseudo Code – Call Function on Button Click
Following is a pseudo code to call a function when the button is clicked.
def someFunction:
function body
tkWindow = Tk()
button = Button(tkWindow, command=someFunction)
Or you can also assign the command after defining the button.
def someFunction:
function body
tkWindow = Tk()
button = Button(tkWindow)
button['command'] = someFunction
Examples
1. Call function to show message on button click
In this example, we will create a function, a Tkinter Button, and assign the function to Button, such that when user clicks on the Button, the function is called.
Python Program
from tkinter import *
from tkinter import messagebox
tkWindow = Tk()
tkWindow.geometry('400x150')
tkWindow.title('PythonExamples.org - Tkinter Example')
def showMsg():
messagebox.showinfo('Message', 'You clicked the Submit button!')
button = Button(tkWindow,
text = 'Submit',
command = showMsg)
button.pack()
tkWindow.mainloop()
CopyOutput
Please remember these things while providing a function to be called when the user clicks the button.
- Define the function prior to the button definition.
- The value to the command option should be the function name as is and not as a string with any quotes around it.
Summary
Concluding this tutorial of Python Examples, we learned how to call a function when Tkinter Button is clicked.