以编程方式更改 OptionMenu 的选定项目

问题描述

我定义了一个简单的 OptionMenu 就像

I have defined a simple OptionMenu like

import Tkinter as tk

optionList = ('a', 'b', 'c')
v = tk.StringVar()
v.set(optionList[0])
om = tk.OptionMenu(self, v, *optionList)

这个列表将以 a 作为默认值出现，这很好.但是也定义了命令按钮，最终需要对其进行更改以显示另一个可用选项(例如 b).如何实现?

This list will appear with a as default which is fine. But there are also command buttons defined which eventually need to alter this to show another of the available options (say b). How can this be achieved?

推荐答案

您已经找到了一种设置和更改默认值的方法.您拥有与该 OptionMenu 小部件相关联的 v 变量.如果您在任何时候再次更改该变量的值，它将更新您的小部件:

You already found a way to set a default value and change it. You have the v variable associated to that OptionMenu widget. If at any time you change the value of that variable again, it will update your widget:

import tkinter as tk

root = tk.Tk()
optionList = ('a', 'b', 'c')
v = tk.StringVar()
v.set(optionList[0])  # Here is the initially selected value
om = tk.OptionMenu(root, v, *optionList)
om.pack()

v.set(optionList[2]) # This one will be the final selected value
root.mainloop()

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