Calling A Widget From Another Class To Change Its Properties In Tkinter

I have made a function in the main constructor of my tKinter app which updates certain properties of widgets e.g. their text across multiple frames. What I'm trying to do is change

Solution 1:

The problem in your code is that you're trying to get an attribute of a class rather than an instance of a class. You need to convert i to the actual instance of that class. You have the additional problem that you're passing 'self.wordLabel' rather than just 'wordLabel'.

A simple fix is to look up the instance in self.frames

def update_widgets(self, frame_list, widget_name, criteria, output):
    for i in frame_list:
        frame = self.frames[i]
        label = getattr(frame, widget_name)
        label[criteria] = output

You also need to change the button command to look like this:

self.changeTextEntryButton = tk.Button(... command=lambda: self.controller.update_widgets([A,B], 'wordLabel', 'text', self.changeTextEntry.get()))

If you intend for update_widgets to always update all of the page classes, there's no reason to pass the list of frame classes in. Instead, you can just iterate over the known classes:

def update_widgets(self, widget_name, criteria, output):
    for frame inself.frames.values():
        label = getattr(frame, 'classLabel')
        label[criteria] = output

You would then need to modify your buttons to remove the list of frame classes:

self.changeTextEntryButton = tk.Button(..., command=lambda: self.controller.update_widgets('wordLabel', 'text', self.changeTextEntry.get()))