Python tkinter Combobox

问题

I want to fill my entries when I click in a name of my Combobox without buttons like 'check' to show the values. How can i do that?

import tkinter as tk
from tkinter import ttk
import csv

root = tk.Tk()
cb = ttk.Combobox(root,state='readonly')
labName = ttk.Label(root,text='Names: ')
labTel = ttk.Label(root,text='TelNum:')
labCity = ttk.Label(root,text='City: ')
entTel = ttk.Entry(root,state='readonly')
entCity = ttk.Entry(root,state='readonly')

with open('file.csv','r',newline='') as file:
    reader = csv.reader(file,delimiter='\t')    


cb.grid(row=0,column=1)
labName.grid(row=0,column=0)
labTel.grid(row=1,column=0)
entTel.grid(row=1,column=1)
labCity.grid(row=2,column=0)
entCity.grid(row=2,column=1)

回答1:

You can use bind() to execute function on_select when you select element on list.

cb.bind('<<ComboboxSelected>>', on_select)

and in this function you can fill Entry.

---

Old example from GitHub: combobox-get-selection

#!/usr/bin/env python3

import tkinter as tk
import tkinter.ttk as ttk

# --- functions ---

def on_select(event=None):
    print('----------------------------')

    if event: # <-- this works only with bind because `command=` doesn't send event
        print("event.widget:", event.widget.get())

    for i, x in enumerate(all_comboboxes):
        print("all_comboboxes[%d]: %s" % (i, x.get()))

# --- main ---

root = tk.Tk()

all_comboboxes = []

cb = ttk.Combobox(root, values=("1", "2", "3", "4", "5"))
cb.set("1")
cb.pack()
cb.bind('<<ComboboxSelected>>', on_select)

all_comboboxes.append(cb)

cb = ttk.Combobox(root, values=("A", "B", "C", "D", "E"))
cb.set("A")
cb.pack()
cb.bind('<<ComboboxSelected>>', on_select)

all_comboboxes.append(cb)

b = tk.Button(root, text="Show all selections", command=on_select)
b.pack()

root.mainloop()

---

EDIT:

Line if event: in on_select works only when you use bind() because it executes function with information about event. command= executes function without arguments and then it sets even=None and then if event: is always False.

来源：https://stackoverflow.com/questions/47500266/python-tkinter-combobox