单击按钮时更改 OptionMenu 的选项 [英] Changing the options of a OptionMenu when clicking a Button

问题描述

假设我有一个选项菜单 network_select，其中包含要连接的网络列表.

Say I have an option menu network_select that has a list of networks to connect to.

import Tkinter as tk

choices = ('network one', 'network two', 'network three')
var = tk.StringVar(root)
network_select = tk.OptionMenu(root, var, *choices)

现在，当用户按下刷新按钮时，我想更新用户可以连接到的网络列表.

Now, when the user presses the refresh button, I want to update the list of networks that the user can connect to.

• 我不能使用 .config，因为我查看了 network_select.config() 并没有看到一个看起来像我给它的选择的条目.
• 我不认为这是可以使用 tk 变量来改变的东西，因为没有 ListVar 这样的东西.

• I don't I can use .config because I looked through network_select.config() and didn't see an entry that looked like the choices I gave it.
• I don't think this is something one can change using a tk variable, because there is no such thing as a ListVar.

推荐答案

我修改了您的脚本以演示如何执行此操作:

I modified your script to demonstrate how to do this:

import Tkinter as tk

root = tk.Tk()
choices = ('network one', 'network two', 'network three')
var = tk.StringVar(root)

def refresh():
    # Reset var and delete all old options
    var.set('')
    network_select['menu'].delete(0, 'end')

    # Insert list of new options (tk._setit hooks them up to var)
    new_choices = ('one', 'two', 'three')
    for choice in new_choices:
        network_select['menu'].add_command(label=choice, command=tk._setit(var, choice))

network_select = tk.OptionMenu(root, var, *choices)
network_select.grid()

# I made this quick refresh button to demonstrate
tk.Button(root, text='Refresh', command=refresh).grid()

root.mainloop()

点击刷新"按钮后，network_select 中的选项将被清除，而 new_choices 中的选项将被插入.

As soon as you click the "Refresh" button, the options in network_select are cleared and the ones in new_choices are inserted.

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