Python Tkinter Combobox

Python provides various libraries for developing Graphical User Interfaces (GUIs) application such as PyQT, Tkinter, Kivy, and PySide. Tkinter is the standard GUI library that provides a fast and easy way to create GUI applications. It is also called the Tk interface. It is an original GUI library for Tcl (Tool Command Language). Tkinter comes pre-installed with Python. The greatest strength of Tkinter is its straightforwardness. It accompanies a wide scope of essential widgets for almost all common tasks, such as text, catches, radio catches, checkboxes, comboboxes, scales, names, or drawing canvas.

The combobox is an important widget and it is found in many applications. It allows a user to select from a list of options. It holds multiple values but shows only one option at a time. You have generally seen this on a Macintosh and Windows interface. In this article, you will learn how to create a combobox using the Tkinter library.

Import the Module

This widget is a class of the ttk module of the Tkinter library. To start using ttk, import its module following the Tk module. Here, we override the widgets of the tk module with the ttk module as ttk provides a better look and feel across many platforms. It is more modern and configured with styles.

from tkinter import *
from tkinter.ttk import *

Tkinter Combobox

The ttk.Combobox widget is used for tkinter drop down list. The syntax is:

combobox = ttk.Combobox(master, option=value, ...)

These are some options accepted by this widget:

Options	Descriptions
justify	The alignment of text within the widget.
height	The height of the pop-down listbox.
postcommand	It is called immediately before displaying the values.
textvariable	It specifies a name whose value is linked to the widget value.
values	It specifies the list of values to display in the drop-down listbox.
width	It specifies the width of the entry window.

Tkinter Combobox Example

Here, we instance the Tkinter combobox widget and also assign the values that will appear in the drop-down list and also configure the fonts for labels and width for both labels and combobox.

import tkinter as tk 
from tkinter import ttk 
  
# Creating tkinter window and set dimensions
window = tk.Tk() 
window.title('Combobox') 
window.geometry('500x250') 
  
# label text for title 
ttk.Label(window, text = "Choose the country and vote for them",  
          background = 'cyan', foreground ="black",  
          font = ("Times New Roman", 15)).grid(row = 0, column = 1) 
  
# Set label 
ttk.Label(window, text = "Select the Country :", 
          font = ("Times New Roman", 12)).grid(column = 0, 
          row = 5, padx = 5, pady = 25)
  
# Create Combobox
n = tk.StringVar() 
country = ttk.Combobox(window, width = 27, textvariable = n) 
  
# Adding combobox drop down list 
country['values'] = (' India',  
                          ' China', 
                          ' Australia', 
                          ' Nigeria', 
                          ' Malaysia', 
                          ' Italy', 
                          ' Turkey', 
                          ' Canada') 
  
country.grid(column = 1, row = 5) 
country.current()

window.mainloop() 

It returns the following on execution-

Tkinter Combobox Event

The following example demonstrates the Tkinter Combobox Event.

from tkinter import *
from tkinter import ttk

def callback():
    l2.configure(text=cmb.get())
    
window=Tk()
window.title('Combobox') 
window.geometry('300x200')

course=["Pizza","Burger","Noodles"]

l1=Label(window,text="Choose Your Favorite Food")
l1.grid(column=0, row=0)
cmb=ttk.Combobox(window,values=course,width=30)
cmb.grid(column=0, row=1)
cmb.current(0)

btn=Button(window,text="Click Here",command=callback)
btn.grid(column=0, row=2)

l2=Label(window,text="")
l2.grid(column=0, row=3)
window.mainloop()

It returns the following output -

Tkinter Combobox Fonts

The following example demonstrates the Tkinter Combobox Fonts.

from tkinter import *
from tkinter import ttk

def callback():
    l2.configure(text=cmb.get())
    
window=Tk()
window.title('Combobox') 
window.geometry('300x200')
fontStyle = ("cooper", 17, "bold")

course=["Pizza","Burger","Noodles"]

l1=Label(window,text="Choose Your Favorite Food")
l1.grid(column=0, row=0)
cmb=ttk.Combobox(window,values=course,width=30,
                 font = fontStyle)
cmb.grid(column=0, row=1)
cmb.current(0)

btn=Button(window,text="Click Here",command=callback)
btn.grid(column=0, row=2)

l2=Label(window,text="")
l2.grid(column=0, row=3)
window.mainloop()

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