Changing screens from a Spinner on_text problem - python-3.x

Question

I'm wanting to create a type of workflow using ScreenManager that progresses as options are selected. I have several screens defined within ScreenManager and within one screen I have created a Spinner with several options. I'm wanting to call a Function from the on_text and pass the selected Spinner value, perform a task based on the passed value and then move to the next screen in the workflow.
I've created a Function inside a class (Screen) with only a print() for testing purposes. When I select an option from the Spinner nothing happens.
I've only provided what I think is the relevant code...
kv file:
<HomeScreen>:
name: 'homeScreen'
BoxLayout:
orientation: 'horizontal'
Label:
id: 'home'
text: 'Home Screen'
<NewSession>:
name: 'newSession'
BoxLayout:
orientation: 'vertical'
Label:
id: new
text: 'Create New Session'
Spinner:
size_hint: None, None
size: 100, 25
id: category
font_size: 12
text: "Food Category" #default value showed
values: ["Beef","Pork","Poultry", "Fish"] #list of values to show
on_text: root.SelectCut(category.text)
Widget:
<CurrentSession>:
id: cs
name: 'currentSession'
BoxLayout:
orientation: 'vertical'
Label:
id: cSession
text: root.cSession
<History>:
name: 'history'
BoxLayout:
orientation: 'vertical'
Label:
id: 'history'
text: 'History Data Screen'
<ScreenManagement>:
HomeScreen:
NewSession:
CurrentSession:
History:
<AllScreen>:
orientation: 'vertical'
ScreenManagement:
id: sm
BoxLayout:
size_hint_y: None
height: 60
spacing: 5
padding: 5, 5, 0, 5
Button:
text: 'Home'
on_press: root.ids.sm.current = 'homeScreen'
Button:
text: 'New Session'
on_press: root.ids.sm.current = 'newSession'
Button:
text: 'Current Session'
on_press:
root.ids.sm.current = 'currentSession'
Button:
text: 'History'
on_press: root.ids.sm.current = 'history'
py file:
Builder.load_file("screenLayout.kv")
class ScreenManagement(ScreenManager):
pass
class HomeScreen(Screen):
pass
class NewSession(Screen):
def SelectCut(self, text):
print("In Select Cut")
print("Food Category: " + text)
self.sm.current = 'homeScreen'
class CurrentSession(Screen):
pass
class History(Screen):
pass
class AllScreen(BoxLayout):
pass
class WorkingTestApp(App):
def build(self):
self.root = AllScreen()
return self.root
if __name__ == '__main__':
WorkingTestApp().run()
I'm not able to figure out why nothing is happening when a selection is made from the Spinner and I'm not sure what the syntax will be from within the Function to move to the next screen.
Update:
Current code (minus imports)
kv:
<HomeScreen>:
name: 'homeScreen'
BoxLayout:
orientation: 'horizontal'
Label:
id: 'home'
text: 'Home Screen'
<NewSession>:
name: 'newSession'
BoxLayout:
orientation: 'vertical'
Label:
id: new
text: 'Create New Session'
Spinner:
size_hint: None, None
size: 100, 25
id: category
font_size: 12
text: "Food Category" #default value showed
values: ["Beef","Pork","Poultry", "Fish"] #list of values to show
on_text: root.SelectCategory()
Widget:
<SelectCut>:
name: 'selectCut'
BoxLayout:
orientation: 'vertical'
Label:
id: 'cut'
text: 'Select Cut Screen'
Widget:
<CurrentSession>:
name: 'currentSession'
BoxLayout:
orientation: 'vertical'
Label:
id: cSession
text: 'Current Session Screen'
<History>:
name: 'history'
BoxLayout:
orientation: 'vertical'
Label:
id: 'history'
text: 'History Data Screen'
<ScreenManagement>:
HomeScreen:
NewSession:
SelectCut:
CurrentSession:
History:
<AllScreen>:
orientation: 'vertical'
ScreenManagement:
id: sm
BoxLayout:
size_hint_y: None
height: 60
spacing: 5
padding: 5, 5, 0, 5
Button:
text: 'Home'
on_press: root.ids.sm.current = 'homeScreen'
Button:
text: 'New Session'
on_press: root.ids.sm.current = 'newSession'
Button:
text: 'Current Session'
on_press:
root.ids.sm.current = 'currentSession'
Button:
text: 'History'
on_press: root.ids.sm.current = 'history'
py:
Builder.load_file("screenLayout.kv")
class ScreenManagement(ScreenManager):
pass
class HomeScreen(Screen):
pass
class NewSession(Screen):
# This Function isn't executing consistently.
def SelectCategory(self):
print("Food Category: " + self.ids.category.text)
self.manager.current = 'selectCut'
class SelectCut(Screen):
pass
class CurrentSession(Screen):
pass
class History(Screen):
pass
class AllScreen(BoxLayout):
pass
class WorkingTestApp(App):
def build(self):
self.root = AllScreen()
return self.root
if __name__ == '__main__':
WorkingTestApp().run()

Answer 1

change your spinner's on_text: root.SelectCut(self, text) to on_text: root.SelectCut() the in your .py change def SelectCut(self, text): to def SelectCut(self): then to change the text you can use self.ids.category.text to read or alter the spinner's text and add root.ids.sm.current = 'your screen' to this function as well