Change command Method for Tkinter Button in Python

I create a new Button object but did not specify the command option upon creation. Is there a way in Tkinter to change the command (onclick) function after the object has been created?


Asked by: Audrey852 | Posted: 01-10-2021






Answer 1

Though Eli Courtwright's program will work fine┬╣, what you really seem to want though is just a way to reconfigure after instantiation any attribute which you could have set when you instantiated┬▓. How you do so is by way of the configure() method.

from Tkinter import Tk, Button

def goodbye_world():
    print "Goodbye World!\nWait, I changed my mind!"
    button.configure(text = "Hello World!", command=hello_world)

def hello_world():
    print "Hello World!\nWait, I changed my mind!"
    button.configure(text = "Goodbye World!", command=goodbye_world)

root = Tk()
button = Button(root, text="Hello World!", command=hello_world)
button.pack()

root.mainloop()

┬╣ "fine" if you use only the mouse; if you care about tabbing and using [Space] or [Enter] on buttons, then you will have to implement (duplicating existing code) keypress events too. Setting the command option through .configure is much easier.

┬▓ the only attribute that can't change after instantiation is name.

Answered by: Catherine174 | Posted: 02-11-2021



Answer 2

Sure; just use the bind method to specify the callback after the button has been created. I've just written and tested the example below. You can find a nice tutorial on doing this at http://www.pythonware.com/library/tkinter/introduction/events-and-bindings.htm

from Tkinter import Tk, Button

root = Tk()
button = Button(root, text="Click Me!")
button.pack()

def callback(event):
    print "Hello World!"

button.bind("<Button-1>", callback)
root.mainloop()

Answered by: Dexter620 | Posted: 02-11-2021



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