In this article, we will be discussing how to get the index of the selected options in the Tkinter Combobox.
A Combobox is a combination of a Listbox and an Entry widget. This widget allows users to select one value from a set of values.
Syntax:
def get_index(*arg):
Label(app, text="The value at index " + str(combo.current()) +\
" is" + " " + str(var.get()), font=('#Font of Text')).pack()
var = StringVar()
combo = ttk.Combobox(app, textvariable=var)
var.trace('w', get_index)
Stepwise Implementation:
Step 1: First of all, import the library Tkinter.
from tkinter import * from tkinter import ttk
Step 2: Now, create a GUI app using Tkinter.
app=Tk()
Step 3: Next, set the geometry of the app.
app.geometry("#Dimensions of the app")
Step 4: Further, create a function to clear the Combobox.
def clear():
combo.set('')
Step 5: Later on, create a function to set the index of the selected option in Combobox.
def get_index(*arg):
Label(app, text="The value at index " + str(combo.current())\
+ " is" + " " + str(var.get()), font=('#Font of Text')).pack()
Step 6: Moreover, create a tuple of some values to be added in the Combobox.
months = ('January', 'February', 'March', 'April', 'May',
'June', 'July','August','September','October',
'November','December')
Step 7: Then, create a Combobox widget and add the values in that Combobox.
var = StringVar() combo = ttk.Combobox(app, textvariable=var) combo['values'] = months combo['state'] = 'readonly' combo.pack(padx=#x-axis padding value, pady=#y-axis padding value)
Step 8: To a greater extent, set the tracing for the given variable.
var.trace('w', get_index)
Step 9: Furthermore, create a button to clear the selected Combobox text value.
button = Button(app, text="Clear", command=clear) button.pack()
Step 10: Finally, make an infinite loop for displaying the app on the screen.
app.mainloop()
Example:
Python3
# Python program to get index of selected # option in Tkinter Combobox # Import the libraries tkinter from tkinter import *from tkinter import ttk # Create a GUI app app = Tk() # Set the geometry of the app app.geometry("600x400") # Function to clear the Combobox def clear(): combo.set('') # Function to print the index of selected option # in Combobox def get_index(*arg): Label(app, text="The value at index " + str(combo.current()) + " is" + " " + str(var.get()), font=('Helvetica 12')).pack() # Define Tuple of months months = ('January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December') # Create a Combobox widget var = StringVar() combo = ttk.Combobox(app, textvariable=var) combo['values'] = months combo['state'] = 'readonly'combo.pack(padx=5, pady=5) # Set the tracing for the given variable var.trace('w', get_index) # Create a button to clear the selected combobox # text value button = Button(app, text="Clear", command=clear) button.pack() # Make infinite loop for displaying app on # the screen app.mainloop() |
Output:
