Autocomplete Combobox Tkinter Jun 2026

tk.Button( button_frame, text="Update Country List", command=self.update_country_list, padx=10 ).pack(side="left", padx=5)

self['values'] = self.filtered_values

For a professional application, you should wrap the logic in a class that inherits from ttk.Combobox . This promotes code reuse, keeps the main application logic clean, and allows us to add advanced features like auto-opening the listbox and preserving cursor position.

class AutocompleteCombobox(ttk.Combobox): def (self, master=None, complete_values=None, **kwargs): """ Initialize the AutocompleteCombobox. :param master: The parent widget. :param complete_values: List of values for autocompletion. :param kwargs: Standard Combobox keyword arguments. """ super(). init (master, **kwargs) self._completion_list = complete_values if complete_values else [] self._hit_index = 0 self._hit_last = "" autocomplete combobox tkinter

# Set initial values self._update_autocomplete()

The code is fully documented and includes error handling. The demo application shows various use cases and how to integrate the widget into your own applications.

self.status_label = tk.Label(info_frame, text="Select an item to see details", font=("Arial", 10)) self.status_label.pack() :param master: The parent widget

If your master list is huge (10,000+ items), filtering on every keystroke may lag. Implement debouncing:

If you run the code above, you will notice a significant usability flaw. When you type, the filtering works, but the autocomplete might behave erratically regarding the case sensitivity or the list popping up. More importantly, the dropdown list won't automatically appear; the user has to click the arrow to see the filtered results.

Args: item: The item to check search_text: The text to search for """ super()

def on_selection(self, event): """Handle selection events.""" widget = event.widget value = widget.get() self.status_label.config(text=f"Selected: value")

from tkinter import ttk import tkinter as tk

ttk.Label(root, text="Search for a country:").pack(pady=10)

import tkinter as tk from tkinter import ttk

# Filter logic (case-insensitive) # We check if the item starts with the typed text hits = [item for item in self._completion_list if item.lower().startswith(current_text.lower())]