How do I get the input from MDTextField?

Question

Testing an app out and I can't find a way to get the input from the text field. I want to be able to get the input of the username and password and use it plug in SQL to get data from a certain account. From what I understand, I can press the submit button and the function i called s1 should be called and print my input but im getting this error:

 File "C:/Users/63917/PycharmProjects/kivymd/mobile.py", line 121, in s1
     print(self.root.ids.userdata.text)
   File "kivy\properties.pyx", line 863, in kivy.properties.ObservableDict.__getattr__
 AttributeError: 'super' object has no attribute '__getattr__'

screen_helper = """
ScreenManager:
    MenuScreen:
    SubmitScreen:
    UploadScreen:

<MenuScreen>:
    name: 'menu'
    
    MDTextField:
        id: userdata
        hint_text: "Enter Username"
        helper_text: "or click on forgot username"
        #helper_text_mode: "persistent"
        helper_text_mode: "on_focus"
        icon_right: "account"
        icon_right_color: app.theme_cls.primary_color
        pos_hint : {'center_x': 0.5, 'center_y': 0.8}
        size_hint_x:None 
        width:250
        mode : "rectangle"    
    MDTextField:
      
        hint_text: "Enter Password"
        helper_text: "or click on forgot Password"
        #helper_text_mode: "persistent"
        password : True
        # password_mask : "*"
        helper_text_mode: "on_focus"
        icon_right: "eye-off"
        icon_right_color: app.theme_cls.primary_color
        pos_hint : {'center_x': 0.5, 'center_y': 0.7}
        size_hint_x:None 
        width:250        
        mode : "rectangle"      
    MDLabel:
        text: "Lil's Lending Shop"
        pos_hint: {'center_x':0.8, 'center_y':0.9}
  
       
    MDRectangleFlatButton:
        text: 'Submit'
        pos_hint: {'center_x':0.5, 'center_y':0.4}
        font_size : 20
        #on_press: root.manager.current = 'submit'
  
           
    MDRectangleFlatButton:
        text: 'Upload'
        pos_hint: {'center_x':0.5, 'center_y':0.5}
        on_press: root.manager.current = 'upload' 
           
<SubmitScreen>:
    name: 'submit'
    MDLabel:
        text: 'Welcome Oliver'
        halign: 'center'

    MDRectangleFlatButton:
        text: 'Menu'
        pos_hint: {'center_x':0.5, 'center_y':0.2}
        on_press: root.manager.current = 'menu'    
       
<UploadScreen>:
    name: 'upload'
    MDLabel:
        text: 'upload daw ek ek'
        halign: 'center'

    MDRectangleFlatButton:
        text: 'Menu'
        pos_hint: {'center_x':0.5, 'center_y':0.2}
        on_press: root.manager.current = 'menu'    

"""


class MenuScreen(Screen):
    pass


class SubmitScreen(Screen):

    pass

class UploadScreen(Screen):
    pass


sm = ScreenManager()
sm.add_widget(MenuScreen(name='menu'))
sm.add_widget(SubmitScreen(name='submit'))
sm.add_widget(UploadScreen(name='upload'))


class DemoApp(MDApp):

    def build(self):
        screen = Builder.load_string(screen_helper)
        return screen
    def s1(self):
        print(self.root.ids.userdata.text)
   



DemoApp().run()

score 0 · Accepted Answer · answered Jan 04 '21 at 13:42

This is because you are using self.root.ids.userdata.text. self.root is your ScreenManager which doesn't contain your text field but MainScreen does. So you have to get your MainScreen first and then get userdata from that. To get MainScreen, you have to use get_screen() function. So, in the end it will be self.root.get_screen("menu").ids.userdata.text

How do I get the input from MDTextField?

1 Answers1