How to change Tkinter Button state from disabled to normal?

问题

I need to change the state from DISABLED to NORMAL of a Button when some event occurs.

Here is the current state of my Button, which is currently disabled:

  self.x = Button(self.dialog, text="Download",
                state=DISABLED, command=self.download).pack(side=LEFT)

 self.x(state=NORMAL)  # this does not seem to work

Can anyonne help me on how to do that?

回答1:

You simply have to set the state of the your button self.x to normal:

self.x['state'] = 'normal'

or

self.x.config(state="normal")

This code would go in the callback for the event that will cause the Button to be enabled.

---

Also, the right code should be:

self.x = Button(self.dialog, text="Download", state=DISABLED, command=self.download)
self.x.pack(side=LEFT)

The method pack in Button(...).pack() returns None, and you are assigning it to self.x. You actually want to assign the return value of Button(...) to self.x, and then, in the following line, use self.x.pack().

回答2:

I think a quick way to change the options of a widget is using the configure method.

In your case, it would look like this:

self.x.configure(state=NORMAL)

回答3:

This is what worked for me. I am not sure why the syntax is different, But it was extremely frustrating trying every combination of activate, inactive, deactivated, disabled, etc. In lower case upper case in quotes out of quotes in brackets out of brackets etc. Well, here's the winning combination for me, for some reason.. different than everyone else?

import tkinter

class App(object):
    def __init__(self):
        self.tree = None
        self._setup_widgets()

    def _setup_widgets(self):
        butts = tkinter.Button(text = "add line", state="disabled")
        butts.grid()

def main():  
    root = tkinter.Tk()
    app = App()
    root.mainloop()

if __name__ == "__main__":
    main()

来源：https://stackoverflow.com/questions/16046743/how-to-change-tkinter-button-state-from-disabled-to-normal