Is it possible to create a combobox that updates with the closest item in its list as you type into it?
For example:
A = ttk.Combobox()
A['values'] = ['Chris', 'Jane', 'Ben', 'Megan']
Then you type "Chr" into the combobox, I want it to automatically fill in "Chris".
The tkinter wiki contains code for a auto-completion textbox, but since you want a combobox, you can use this code (you're looking for AutocompleteCombobox).
"""
tkentrycomplete.py
A Tkinter widget that features autocompletion.
Created by Mitja Martini on 2008-11-29.
Updated by Russell Adams, 2011/01/24 to support Python 3 and Combobox.
Updated by Dominic Kexel to use Tkinter and ttk instead of tkinter and tkinter.ttk
Licensed same as original (not specified?), or public domain, whichever is less restrictive.
"""
import sys
import os
import Tkinter
import ttk
__version__ = "1.1"
# I may have broken the unicode...
Tkinter_umlauts=['odiaeresis', 'adiaeresis', 'udiaeresis', 'Odiaeresis', 'Adiaeresis', 'Udiaeresis', 'ssharp']
class AutocompleteEntry(Tkinter.Entry):
"""
Subclass of Tkinter.Entry that features autocompletion.
To enable autocompletion use set_completion_list(list) to define
a list of possible strings to hit.
To cycle through hits use down and up arrow keys.
"""
def set_completion_list(self, completion_list):
self._completion_list = sorted(completion_list, key=str.lower) # Work with a sorted list
self._hits = []
self._hit_index = 0
self.position = 0
self.bind('<KeyRelease>', self.handle_keyrelease)
def autocomplete(self, delta=0):
"""autocomplete the Entry, delta may be 0/1/-1 to cycle through possible hits"""
if delta: # need to delete selection otherwise we would fix the current position
self.delete(self.position, Tkinter.END)
else: # set position to end so selection starts where textentry ended
self.position = len(self.get())
# collect hits
_hits = []
for element in self._completion_list:
if element.lower().startswith(self.get().lower()): # Match case-insensitively
_hits.append(element)
# if we have a new hit list, keep this in mind
if _hits != self._hits:
self._hit_index = 0
self._hits=_hits
# only allow cycling if we are in a known hit list
if _hits == self._hits and self._hits:
self._hit_index = (self._hit_index + delta) % len(self._hits)
# now finally perform the auto completion
if self._hits:
self.delete(0,Tkinter.END)
self.insert(0,self._hits[self._hit_index])
self.select_range(self.position,Tkinter.END)
def handle_keyrelease(self, event):
"""event handler for the keyrelease event on this widget"""
if event.keysym == "BackSpace":
self.delete(self.index(Tkinter.INSERT), Tkinter.END)
self.position = self.index(Tkinter.END)
if event.keysym == "Left":
if self.position < self.index(Tkinter.END): # delete the selection
self.delete(self.position, Tkinter.END)
else:
self.position = self.position-1 # delete one character
self.delete(self.position, Tkinter.END)
if event.keysym == "Right":
self.position = self.index(Tkinter.END) # go to end (no selection)
if event.keysym == "Down":
self.autocomplete(1) # cycle to next hit
if event.keysym == "Up":
self.autocomplete(-1) # cycle to previous hit
if len(event.keysym) == 1 or event.keysym in Tkinter_umlauts:
self.autocomplete()
class AutocompleteCombobox(ttk.Combobox):
def set_completion_list(self, completion_list):
"""Use our completion list as our drop down selection menu, arrows move through menu."""
self._completion_list = sorted(completion_list, key=str.lower) # Work with a sorted list
self._hits = []
self._hit_index = 0
self.position = 0
self.bind('<KeyRelease>', self.handle_keyrelease)
self['values'] = self._completion_list # Setup our popup menu
def autocomplete(self, delta=0):
"""autocomplete the Combobox, delta may be 0/1/-1 to cycle through possible hits"""
if delta: # need to delete selection otherwise we would fix the current position
self.delete(self.position, Tkinter.END)
else: # set position to end so selection starts where textentry ended
self.position = len(self.get())
# collect hits
_hits = []
for element in self._completion_list:
if element.lower().startswith(self.get().lower()): # Match case insensitively
_hits.append(element)
# if we have a new hit list, keep this in mind
if _hits != self._hits:
self._hit_index = 0
self._hits=_hits
# only allow cycling if we are in a known hit list
if _hits == self._hits and self._hits:
self._hit_index = (self._hit_index + delta) % len(self._hits)
# now finally perform the auto completion
if self._hits:
self.delete(0,Tkinter.END)
self.insert(0,self._hits[self._hit_index])
self.select_range(self.position,Tkinter.END)
def handle_keyrelease(self, event):
"""event handler for the keyrelease event on this widget"""
if event.keysym == "BackSpace":
self.delete(self.index(Tkinter.INSERT), Tkinter.END)
self.position = self.index(Tkinter.END)
if event.keysym == "Left":
if self.position < self.index(Tkinter.END): # delete the selection
self.delete(self.position, Tkinter.END)
else:
self.position = self.position-1 # delete one character
self.delete(self.position, Tkinter.END)
if event.keysym == "Right":
self.position = self.index(Tkinter.END) # go to end (no selection)
if len(event.keysym) == 1:
self.autocomplete()
# No need for up/down, we'll jump to the popup
# list at the position of the autocompletion
def test(test_list):
"""Run a mini application to test the AutocompleteEntry Widget."""
root = Tkinter.Tk(className=' AutocompleteEntry demo')
entry = AutocompleteEntry(root)
entry.set_completion_list(test_list)
entry.pack()
entry.focus_set()
combo = AutocompleteCombobox(root)
combo.set_completion_list(test_list)
combo.pack()
combo.focus_set()
# I used a tiling WM with no controls, added a shortcut to quit
root.bind('<Control-Q>', lambda event=None: root.destroy())
root.bind('<Control-q>', lambda event=None: root.destroy())
root.mainloop()
if __name__ == '__main__':
test_list = ('apple', 'banana', 'CranBerry', 'dogwood', 'alpha', 'Acorn', 'Anise' )
test(test_list)
chr(event.keycode) for each non-english letter as a key and the letter as a value. Then I added the line if event.keysym == '??': event.keysym = dict[chr(event.keycode)] right below the autocomplete function deceleration. Maybe its not such a good solution –
Fatality Yes, it can be easily done using the following example, taken from here:
from ttkwidgets.autocomplete import AutocompleteEntry
from tkinter import *
countries = [
'Antigua and Barbuda', 'Bahamas','Barbados','Belize', 'Canada',
'Costa Rica ', 'Cuba', 'Dominica', 'Dominican Republic', 'El Salvador ',
'Grenada', 'Guatemala ', 'Haiti', 'Honduras ', 'Jamaica', 'Mexico',
'Nicaragua', 'Saint Kitts and Nevis', 'Panama ', 'Saint Lucia',
'Saint Vincent and the Grenadines', 'Trinidad and Tobago', 'United States of America'
]
ws = Tk()
ws.title('PythonGuides')
ws.geometry('400x300')
ws.config(bg='#f25252')
frame = Frame(ws, bg='#f25252')
frame.pack(expand=True)
Label(
frame,
bg='#f25252',
font = ('Times',21),
text='Countries in North America '
).pack()
entry = AutocompleteEntry(
frame,
width=30,
font=('Times', 18),
completevalues=countries
)
entry.pack()
ws.mainloop()
That's a problem that I've run into too, so I solved old-school.
I've created a tkinter widget (child of ttk.Combobox) that handles the filtering operations. You can found that on PyPI and GitHub, under the name of autocombobox, and you can install it as a python module using pip install autocombobox. I worked hard to make this widget identical to the original one in the aspect and in the usage in the program, handling configure method and proper events. You can try it.
If you encounter any problem, please open an issue on GitHub, I will fix it.
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