How to get the index of selected option in Tkinter Combobox?
When working with user interfaces, it is sometimes necessary to get the index of the selected option in a dropdown list or combobox. Tkinter is a popular GUI toolkit used in Python that provides a combobox widget for this purpose. In this article, we will show you how to get the index of the selected option in a Tkinter Combobox.
The Tkinter Combobox Widget
The Tkinter Combobox widget is a drop-down list that allows the user to select one item from a set of options. It is similar to the tkinter OptionMenu widget, but it has more customization options. Here is an example of how to create a Combobox widget in tkinter:
from tkinter import ttk
import tkinter as tk
root = tk.Tk()
# Create a Combobox widget
combo = ttk.Combobox(root, values=['Option 1', 'Option 2', 'Option 3'])
combo.pack()
root.mainloop()
Running the above code will display a Tkinter window with a Combobox widget containing three options.
Getting the Index of the Selected Option
To get the index of the selected option in a Tkinter Combobox, we need to bind the widget’s <<ComboboxSelected>>
event and create a callback function that extracts the index of the selected item from the widget’s current()
method. Here is an example code that demonstrates how to do this:
from tkinter import ttk
import tkinter as tk
root = tk.Tk()
# Create a Combobox widget
combo = ttk.Combobox(root, values=['Option 1', 'Option 2', 'Option 3'])
combo.pack()
def get_selected_index(event):
index = combo.current()
print('Selected index:', index)
# Bind the ComboboxSelected event to the callback function
combo.bind("<<ComboboxSelected>>", get_selected_index)
root.mainloop()
When the user selects an option from the dropdown list, the get_selected_index
callback function will be called, and it will print the index of the selected option to the console.
In the get_selected_index
function, we first obtain the index of the selected item using the current()
method of the Combobox widget. This method returns the index of the currently selected item in the list of values passed to the widget. We then print the index to the console for demonstration purposes.
Conclusion
In this article, we have shown you how to get the index of the selected option in a Tkinter Combobox. By binding the <<ComboboxSelected>>
event to a callback function and using the current()
method of the Combobox widget, we can easily obtain the index of the selected item. We hope you found this article helpful and can use this knowledge in your future projects.