如何在Tkinter中单击校验按钮后显示消息？

Question

我想知道如何才能在单击校验按钮后得到显示的消息。说些你选择了1-3的话。有什么想法吗？

     msg1 = f"How many pairs of shoes do you have?\n"
        self.text_widget.configure(state=NORMAL)
        self.text_widget.insert(END, msg1, 'person_text')
        self.text_widget.configure(state=DISABLED)
       
        var1 = tk.StringVar()
        box1 = tk.Checkbutton(self.window, variable = var1, offvalue="", onvalue="1-3", text = '1-3')
        
        var2 = tk.StringVar()
        box2 = tk.Checkbutton(self.window, variable = var2, offvalue="", onvalue="4-7", text = '4-7')
        
        var3 = tk.StringVar()
        box3 = tk.Checkbutton(self.window, variable = var3, offvalue="", onvalue="10+", text = '10+')
        
        self.text_widget.window_create("5.0", window = box1)
        self.text_widget.window_create("5.0", window = box2)
        self.text_widget.window_create("5.0", window = box3)

Answer 1

我可能建议使用ttk.Radiobutton小部件而不是tk.Checkbutton，因为这些选项似乎相互排斥。另外，您只需要一个tk.StringVar()就可以以这种方式存储选择值。

import tkinter as tk
import tkinter.messagebox as tkm
from tkinter import ttk


def on_btn_change() -> None:
    """This function is called when a selection is made"""
    selection=btn_var.get()  # fetch the selected value
    tkm.showinfo(  # show the dialog message
        title='Selection Made',
        message=f'You selected {selection}'
    )


btn_var = tk.StringVar()  # variable to store the button selection
buttons = ['1-3', '4-6', '7-9', '10+']  # button names / values

for name in buttons:  # create buttons
    ttk.Radiobutton(
        root,  # or whatever your tk.Tk() instance is called
        text=name,
        value=name,
        variable=btn_var,  # store the selection in 'btn_var'
        command=on_btn_change,  # this function is called each time the button changes
        state=tk.NORMAL  # not required, but it doesn't hurt anything
    ).pack()  # remember to 'pack()' or nothing will show up!

编辑--只是想说这只是一个例子，显然不会按原样运行。另外，如果您正在使用类构建您的Tk应用程序(您似乎--这一点对您很好)，那么您需要将self作为参数添加到on_btn_change()中，例如：def on_btn_change(self) -> None: . . .，您可能希望分别将btn_var和buttons更改为self.btn_var和self.buttons。