Retrieving And Using A Tkinter Combobox Selection

I am putting together a GUI for a customized calculator that automatically converts certain units of measurements into other units of measurement. I want to return the actual text

Solution 1:

You should retrieve the content of comboARU using get() function as follows:

defcallback(eventObject):
    print(comboARU.get())

Solution 2:

you can retrieve the value of the Combobox directly off the event object by eventObject.widget.get() .

import tkinter as tk
from tkinter.ttk import *

master = tk.Tk()
master.title("Gas Calculator")
v = tk.IntVar()
combo = Combobox(master)

defcallback(eventObject):
    # you can also get the value off the eventObjectprint(eventObject.widget.get())
    # to see other information also available on the eventObjectprint(dir(eventObject))

comboARU = Combobox(master)
comboARU['values']= ("Acres", "Ft^2")
comboARU.current(0) #set the selected item
comboARU.grid(row=3, column=2)
comboARU.bind("<<ComboboxSelected>>", callback)

master.mainloop()

Solution 3:

If you want be get be able to use the default value set with comboAru.current(0), event handling doesn't work, I find it works best to get the combobox value when pressing an OK button, and if you want to get the value and use it afterwards, it's best to create a class, avoiding global variables (because the class instance and it's variables remain after tkinter window is destroyed) (based on answer https://stackoverflow.com/a/49036760/12141765).

import tkinter as tk     # Python 3.xfrom tkinter import ttk

classComboboxSelectionWindow():
    def__init__(self, master):
        self.master=master
        self.entry_contents=None
        self.labelTop = tk.Label(master,text = "Select one of the following")
        self.labelTop.place(x = 20, y = 10, width=140, height=10)
        self.comboBox_example = ttk.Combobox(master,values=["Choice 1","Second choice","Something","Else"])
        self.comboBox_example.current(0)
        self.comboBox_example.place(x = 20, y = 30, width=140, height=25)

        self.okButton = tk.Button(master, text='OK',command = self.callback)
        self.okButton.place(x = 20, y = 60, width=140, height=25)

    defcallback(self):
        """ get the contents of the Entry and exit
        """
        self.comboBox_example_contents=self.comboBox_example.get()
        self.master.destroy()

defComboboxSelection():

    app = tk.Tk()
    app.geometry('180x100')
    Selection=ComboboxSelectionWindow(app)
    app.mainloop()

    print("Selected interface: ", Selection.comboBox_example_contents)

    return Selection.comboBox_example_contents

print("Tkinter combobox text selected =", ComboboxSelection())