mdDataTable | Angular data table complete implementation of google | Grid library

I have tried many posts here in relation to my problem but nothing works for me. I am sure that i am not good enough to understand them.

I want to basically send a datatable to the popup window. I made the same program with ttk.treeview. this ttk.treeview showed me a good table. but now i want to upgrade it with kivy. hence i chose datatable. i could not find any other option to show a nice looking data table like ttk.treeview. Do you have any suggestion besides datatable?

When you run this python file, you will see popup screen. you click "Dex", then it opens a popup window. You put any data there then Click "Calculate", then i want to show the result of the calculation of those inputs into the bottom button space of this window.

I put a dummy datatable in the calculate(self) function.

Would you help me with this? My problem line is python file line 77.

Tons of thanks in advance.

Python File:

'''

I am making a simpel todo app which takes input from user through MDDialog and add to MDDataTable tempraly i want to know how to use user input in MDDialog to insert in MDDataTable ‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ ‫ 

Basically, I am writing code in builder format but I need to use python code for my table screen. I don't know how to call the table screen to open when a button is executed in kivy string file. Here's the minimal working code for the same:

kivy 2.0.0, kivymd 0.104.2dev0, python3.7

I am having error intermittently when I add MDdatatable to new screen's MDBoxLayout with button press.

sometime get error immediately, sometime get error once out of 30 times of try.

My class OrderManagementScreen is firstly instantiated by Builder.load_file and then by sm.add_widget(OrderManagementScreen(name='order_management')).

I would like to be able to access the instance created by Builder.load_file - how can I do this?

This post is the closest I could find, but when I do MDApp.get_running_app().root it returns None.

app.py: (mixture of attempts in my update_database function)

I'm trying to create an app where after you log in you're shown a table of users. If the login is successful I want the user to be sent to another screen that has an MDDataTable in it.

All of the examples I've found online only show how to display the table using the build method in the main app.

Code example:

I am trying to use the MDDataTable in my App like I use my ModalViews. That is I declare the layout in my separate indexui kivy file like

I would like to show the textfield input from screen Eingabe in the label from the second screen Ausgabe. I do not understand the reference from the kivy language. Thanks! I always get an error: