How to Access Variable Data from an Entry Widget in a Multi-Page Tkinter Application?

Extracting Variable Data from a Class in a Multi-Page Application

Question:

In a multi-page Tkinter application, how do you access variable data from an Entry widget in one page within another page? Every attempt raises an exception.

How to Leverage the Controller:

Given the app's existing controller concept, use it to facilitate communication between pages.

1. Save a controller reference in each page:

   class PageOne(ttk.Frame):
       def __init__(self, parent, controller):
           self.controller = controller

2. Create a controller method to return a page given its class name:

   class MyApp(Tk):
       def get_page(self, classname):
           for page in self.frames.values():
               if str(page.__class__.__name__) == classname:
                   return page

3. Access public members of other pages:

   class PageTwo(ttk.Frame):
       def print_it(self):
           page_one = self.controller.get_page("PageOne")
           value = page_one.some_entry.get()

Storing Data in the Controller:

To avoid tight coupling, consider storing data in the controller:

1. Create a data structure in the controller (e.g., dictionary):

   class MyApp(Tk):
       def __init__(self):
           self.app_data = {"name": StringVar()}

2. Modify pages to reference the controller when creating widgets:

   class PageOne(ttk.Frame):
       def __init__(self, parent, controller):
           self.controller=controller
           self.some_entry = ttk.Entry(self, textvariable=self.controller.app_data["name"])

3. Access data from the controller:

   class PageTwo(ttk.Frame):
       def print_it(self):
           value = self.controller.app_data["name"].get()

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