How to checkbox to enable a button in Tkinter

Question

self.label_5 = tk.Checkbutton(self.master, text="I agree to the", bg='white', width=14,font=("Arial", 8), command= activator)
self.label_5.place(x=112, y=410)
self.button_2 = tk.Button(text='Proceed', width=20, bg='white', state = tk.DISABLED, bd=1, 
highlightbackground='black', font=("Arial", 10)).place(x=208, y = 512)

def activator(button):
    if (self.button_2 ['state'] == tk.DISABLED):
        self.button_2 ['state'] = tk.NORMAL
    else:
        self.button_2['state'] = tk.DISABLED

I want to enable the proceed button after I checked the checkbutton but I can't seem to figure it out.

You assigned `None` to `self.button_2` (the return value of `.place()`), rather than the actual button. — jasonharper, Feb 22 '20 at 06:03
Read [AttributeError: NoneType object has no attribute ...](https://stackoverflow.com/a/1101765/7414759) — stovfl, Feb 22 '20 at 08:37

DaniyalAhmadSE · Accepted Answer · 2020-02-26T15:11:03.960

You have to make the following changes to your code:

You have to refer to the function named activator as self.activator when giving it to the Button(button_2) as command.
You have to change the parameter named button of the function named activator to self.
And the most important thing you need to do is move the part of code where you are placing the Button(button_2) and the Checkbutton(label_5), to a new line. Like I have done in the code below. The reason for doing so is that pack, grid and place always return None. And when you do it in the same line where you have created your widgets and assigned them to a variable i.e. button_2 and label_5, the value None gets stored in that widget.

Here's the corrected code:

import tkinter as tk


class Test:
    def __init__(self):
        self.master = tk.Tk()
        self.master.geometry('550x550')

        self.label_5 = tk.Checkbutton(self.master, text="I agree to the", bg='white', width=14, font=("Arial", 8),
                                      command=self.activator)
        self.label_5.place(x=112, y=410)

        self.button_2 = tk.Button(text='Proceed', width=20, bg='white', state=tk.DISABLED, bd=1,
                                  highlightbackground='black', font=("Arial", 10))
        self.button_2.place(x=208, y=512)

        self.master.mainloop()

    def activator(self):

        if self.button_2['state'] == tk.DISABLED:
            self.button_2['state'] = tk.NORMAL

        else:
            self.button_2['state'] = tk.DISABLED


if __name__ == '__main__':
    Test()

How to checkbox to enable a button in Tkinter

1 Answers1