CODEWITHSUNDEEP
pythonpython-3.xtkinter
JChris
JChris

Reputation: 1678

How to get a value from a popup in Tkinter?

I'm trying to create a popup with one Entry and one Button. I need to get whatever the user input into that entry and bring back to my main window. I'm using Python 3.6.0. I have the following code (which was inspired by the code from this question):

from tkinter import *


class Application(Frame):    
    def __init__(self, master=None):
        super().__init__(master)

        self.server_address = None

        self.master = master
        self.master.title('Application')
        self.master.resizable(width=False, height=False)
        self.master.minsize(width=800, height=600)
        self.master.maxsize(width=800, height=600)

        self.grid()
        self.init_menubar()

    def init_menubar(self):
        menubar = Menu(self.master)
        self.master.config(menu=menubar)

        filemenu = Menu(menubar, tearoff=False)
        filemenu.add_command(label="Set remote server", command=self.call_server_config)
        filemenu.add_command(label="Set refresh delay", command=None)
        filemenu.add_separator()
        filemenu.add_command(label="Close", command=self.master.destroy)
        menubar.add_cascade(label='File', menu=filemenu)

        helpmenu = Menu(menubar, tearoff=False)
        helpmenu.add_command(label="Help", command=None)
        menubar.add_cascade(label='Help', menu=helpmenu)

    def call_server_config(self):
        popup = ServerConfig(self.master)
        self.master.wait_window(popup.top)
        print('DEBUG:', popup.value)
        self.create_widgets()


class ServerConfig(Frame):
    def __init__(self, master=None):
        super().__init__(master)

        self.top = Toplevel(master)
        self.label = Label(self.top, text="Server address")
        self.label.pack()
        self.entry = Entry(self.top)
        self.entry.pack()
        self.button = Button(self.top, text='Ok', command=self.top.destroy())

        self.value = self.entry.get()


if __name__ == '__main__':
    root = Tk()
    app = Application(master=root)
    app.mainloop()

Which gives me the error:

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\<...>\Python\Python36\lib\tkinter\__init__.py", line 1699, in __call__
    return self.func(*args)
  File "D:/Documents/<...>/tk-client.py", line 45, in call_server_config
    popup = ServerConfig(self)
  File "D:/Documents/<...>/tk-client.py", line 60, in __init__
    self.button = Button(self.top, text='Ok', command=self.top.destroy())
  File "C:\Users\<...>\Python\Python36\lib\tkinter\__init__.py", line 2363, in __init__
    Widget.__init__(self, master, 'button', cnf, kw)
  File "C:\Users\<...>\Python\Python36\lib\tkinter\__init__.py", line 2293, in __init__
    (widgetName, self._w) + extra + self._options(cnf))
_tkinter.TclError: bad window path name ".!application.!toplevel"

Upvotes: 2

Views: 1401

Answers (1)

Taku
Taku

Reputation: 33714

This piece of code caused the exception:

self.button = Button(self.top, text='Ok', command=self.top.destroy())

The reason for this is because self.top.destroy() was first evaluated when you created the button. Therefore you couldn’t place the button on self.top as it was destroyed. You will need to change it to this:

self.button = Button(self.top, text='Ok', command=self.top.destroy)

command=self.top.destroy which only execute self.top.destroy when the button get pressed

Upvotes: 2

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