Question

这是我在Tkinter的ComboBox。当我想从此组合框中选择某项时，什么也没有发生。我看到了光标从数据库中选择的所有选项，但我会说它是“只读的”。为了进行测试，我写了一个if语句来确保这一点，但是不幸的是，消息框没有出现。我想我需要更多操作此组合框的信息，请帮助我。

var1 = StringVar()
lblChooseaModel = Label(bottomLeftTopR, font = ('arial', 12, 'bold'), text = 
"Choose a model", fg = "black", width = 13, bd = 14, anchor = 'w')

lblChooseaModel.grid(row = 0, column = 0)

cboChooseaModel = ttk.Combobox(bottomLeftTopR, textvariable = var1, font = 
('arial', 20, 'bold'), width = 12)

models_query = cur.execute('SELECT name_of_model FROM models')
data_models = ['']
for row in models_query:
    data_models.append(row)

cboChooseaModel['value'] = data_models
cboChooseaModel.current(0)
cboChooseaModel.grid(row = 1, column = 0)

if cboChooseaModel.get() == (data_models[1]):
    messagebox.showinfo("You chose Mazda 2")

当我打印“ data_models”时，我可以看到：

[''，（'马自达2'），（'马自达3'），（'马自达6'），（'马自达CX 3'），（'马自达CX 5'）]

Answer 1

将跟踪添加到组合框的StringVar：

#tkinter setup
from tkinter import *
import tkinter.ttk as ttk
from tkinter import messagebox
bottomLeftTopR = Tk()

def combo_choose(value):
    messagebox.showinfo("Choice", "You Chose " + value)

var1 = StringVar()
lblChooseaModel = Label(bottomLeftTopR, font = ('arial', 12, 'bold'),text = "Choose a model",
                        fg = "black", width = 13, bd = 14, anchor = 'w')

lblChooseaModel.grid(row = 0, column = 0)

cboChooseaModel = ttk.Combobox(bottomLeftTopR, textvariable = var1,
                               font = ('arial', 20, 'bold'), width = 12)

#models_query = cur.execute('SELECT name_of_model FROM models')
#data_models = ['']
#for row in models_query:
#    data_models.append(row)

# Replaced query with data
data_models = [ ' ', ('Mazda 2'), ('Mazda 3'), ('Mazda 6'), ('Mazda CX 3'), ('Mazda CX 5') ]

cboChooseaModel['value'] = data_models
cboChooseaModel.current(0)
cboChooseaModel.grid(row = 1, column = 0)

var1.trace('w', lambda name, index, mode: combo_choose(var1.get()))

您可以在combo_choose函数中使用选定的值执行任何操作。在此代码中，列表chosen被传递给函数，并将值附加到列表中，然后打印该列表。

#tkinter setup
from tkinter import *
import tkinter.ttk as ttk
from tkinter import messagebox
bottomLeftTopR = Tk()

def combo_choose(chosen, value):
    chosen.append(value)
    print("You've chosen ", *chosen)
    print(chosen)

var1 = StringVar()
lblChooseaModel = Label(bottomLeftTopR, font = ('arial', 12, 'bold'),text = "Choose a model",
                        fg = "black", width = 13, bd = 14, anchor = 'w')

lblChooseaModel.grid(row = 0, column = 0)

cboChooseaModel = ttk.Combobox(bottomLeftTopR, textvariable = var1,
                               font = ('arial', 20, 'bold'), width = 12)

#models_query = cur.execute('SELECT name_of_model FROM models')
#data_models = ['']
#for row in models_query:
#    data_models.append(row)

# Replaced query with data
data_models = [ ' ', ('Mazda 2'), ('Mazda 3'), ('Mazda 6'), ('Mazda CX 3'), ('Mazda CX 5') ]

cboChooseaModel['value'] = data_models
cboChooseaModel.current(0)
cboChooseaModel.grid(row = 1, column = 0)

chosen = []
var1.trace('w', lambda name, index, mode: combo_choose(chosen, var1.get()))

从Tkinter中的组合框返回值

1 个答案: