How to set the tab order in a Tkinter application?

The tab order in any GUI application determines which widget receives focus when the user presses the Tab key. In Tkinter applications, you can control this navigation order to improve user experience and accessibility.

Understanding Tab Order

By default, Tkinter sets the tab order based on the sequence in which widgets are created. However, you can customize this behavior using the lift() method to programmatically change the focus order.

Example

Here's how to create Entry widgets and modify their tab order ?

# Import the required libraries
from tkinter import *

# Create an instance of Tkinter Frame
win = Tk()

# Set the geometry of Tkinter Frame
win.geometry("700x350")
win.title("Tab Order Example")

# Add entry widgets
e1 = Entry(win, width=35, bg='#ac12ac', fg='white')
e1.pack(pady=10)

e2 = Entry(win, width=35)
e2.pack(pady=10)

e3 = Entry(win, width=35, bg='#aa23dd', fg='white')
e3.pack(pady=10)

# Change the tab order
def change_tab():
    widgets = [e3, e2, e1]
    for widget in widgets:
        widget.lift()

# Create a button to change the tab order
Button(win, text="Change Order", font=('Helvetica', 11), command=change_tab).pack(pady=20)

win.mainloop()

How It Works

The lift() method raises widgets in the stacking order, which affects the tab navigation sequence. When you call lift() on widgets in a specific order, Tkinter updates the focus traversal accordingly.

Alternative Approach Using focus_set()

You can also control focus programmatically using focus_set() ?

from tkinter import *

win = Tk()
win.geometry("400x300")

# Create Entry widgets
entry1 = Entry(win, width=30)
entry1.pack(pady=10)

entry2 = Entry(win, width=30)
entry2.pack(pady=10)

entry3 = Entry(win, width=30)
entry3.pack(pady=10)

# Function to set focus to specific widget
def focus_entry3():
    entry3.focus_set()

Button(win, text="Focus Entry 3", command=focus_entry3).pack(pady=10)

win.mainloop()

Key Methods

Conclusion

Use lift() to modify the tab order by changing widget stacking, or focus_set() for direct focus control. This improves navigation and user experience in your Tkinter applications.