Updating a kivy label on a screen when dynamically generating it through a list?

Firstly, disclaimer: I am terribly new to programming and am trying to build my understanding with this project. Additionally, let me say I have searched the forums and found similar posts to mine, but none have the issue of updating a label that has been dynamically generated through a list.

My question is in my code, commented out, but to summarize: I generate buttons and labels for each item in a list. Then the buttons should add and subtract from the linked value in a dictionary. Currently the code does this, but the labels on screen don't update to reflect the new values. Can someone please assist with updating the value for "ordlayout.add_widget(ordlayout.lbl[str(i)])" when calling to updateup and updatedown?

import kivy

kivy.require('1.10.0')

from kivy.app import App

from kivy.uix.label import Label

from kivy.uix.button import Button

from kivy.uix.widget import Widget

from kivy.properties import ObjectProperty

from kivy.uix.behaviors import ButtonBehavior

from kivy.uix.gridlayout import GridLayout

from kivy.uix.scrollview import ScrollView

from kivy.uix.textinput import TextInput

from kivy.lang import Builder

from kivy.uix.dropdown import DropDown

from kivy.base import runTouchApp

from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition

from functools import partial

#The first screen the app opens to. Contains all other screen branches.

class MainScreen(Screen):

    pass



#NewOrder will be the screen used for choosing which

#items/and how many of each the customer wants added.

class NewOrder(Screen):

    def __init__(self, **kwargs):

        super(NewOrder, self).__init__(**kwargs)

        #This will eventually read/create a list of strings from a user-modified file.

        self.foods = ["Puppy", "Cat", "Fish"]

        #I create a dictionary linking a number to each item.

        self.countfoods = {}

        for i in self.foods:

            self.countfoods[i] = 0

        #Now I create a grid layout to put on the screen.

        ordlayout = GridLayout()

        ordlayout.cols = 8

        ordlayout.row_default_height=20

        ordlayout.buttons={}

        ordlayout.btns1 = {}

        ordlayout.lbl = {}

        #The items I want on the screen are 1.)First item from list. 2.) Minus button.

        #3.) Current number of the item. 4.) Plus button.

        #I want these four buttons for each item.

        for i in self.countfoods:

            #Adds text for first item.

            ordlayout.add_widget(Label(text=i))

            #Adds a button for minus, linked to a unique dict value.

            ordlayout.buttons[str(i)] = Button(text="-")

            ordlayout.lbl[str(i)] = Label(text=str((self.countfoods[i])))

            #The below assigns the specific object location of each label

            #to a variable for passing to ocuntup and countdown.

            tempPlacement = str(ordlayout.lbl[str(i)])

            ordlayout.buttons[str(i)].bind(on_press=partial(self.updatedown, i))

            ordlayout.add_widget(ordlayout.buttons[str(i)])

            #Add the value that I want to update.

            ordlayout.add_widget(ordlayout.lbl[str(i)])

            #Adds a button for addition, but doesn't properly link it to a specific value.

            ordlayout.btns1[str(i)] = Button(text="+")

            ordlayout.btns1[str(i)].bind(on_press=partial(self.updateup, i))

            ordlayout.add_widget(ordlayout.btns1[str(i)])

        #Add that grid wit

            h values to the screen.

        self.add_widget(ordlayout)



    #Function used to change value down by one.

    def updatedown(self, event, i):

        self.countfoods[event] -= 1

        print (self.countfoods)



    #Function used to change value up by one.

    def updateup(self, event, i):

        self.countfoods[event] += 1

        print (self.countfoods)





#AdminOpt will be the screen used for

class AdminOpt(Screen):

    def __init__(self, **kwargs):

        super(AdminOpt, self).__init__(**kwargs)



#Will allow for opening and checking of created orders.

class OrdHist(Screen):

    pass



#This is purely the class used for managing the other screens.

class ScreenManagement(ScreenManager):

    pass





Main = Builder.load_file("Order Handler2.kv")





class Customer:

    def __init__(self, name, pricelist):

        self.name = name

        self.pricelist = pricelist





class SimpleKivy(App):

    def build(self):

        return Main





if __name__== "__main__":

    SimpleKivy().run()

asked Nov 21 '18 at 0:03

Mihslayer

Your updateup and updatedown methods need to explicitly change the text property of the Label in addition to changing the vale.

– John Anderson
Nov 21 '18 at 3:47

I was aware that the label needed updated, but I'm not sure on how to word the code to do so. I had thought something akin to- self.ordlayout.lbl[str(event)] += 1 However, this returns something akin to "self has no attribute ordlayout". I will update with the exact error when possible.

– Mihslayer
Nov 27 '18 at 14:16

add a comment |

import kivy

kivy.require('1.10.0')

from kivy.app import App

from kivy.uix.label import Label

from kivy.uix.button import Button

from kivy.uix.widget import Widget

from kivy.properties import ObjectProperty

from kivy.uix.behaviors import ButtonBehavior

from kivy.uix.gridlayout import GridLayout

from kivy.uix.scrollview import ScrollView

from kivy.uix.textinput import TextInput

from kivy.lang import Builder

from kivy.uix.dropdown import DropDown

from kivy.base import runTouchApp

from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition

from functools import partial

#The first screen the app opens to. Contains all other screen branches.

class MainScreen(Screen):

    pass



#NewOrder will be the screen used for choosing which

#items/and how many of each the customer wants added.

class NewOrder(Screen):

    def __init__(self, **kwargs):

        super(NewOrder, self).__init__(**kwargs)

        #This will eventually read/create a list of strings from a user-modified file.

        self.foods = ["Puppy", "Cat", "Fish"]

        #I create a dictionary linking a number to each item.

        self.countfoods = {}

        for i in self.foods:

            self.countfoods[i] = 0

        #Now I create a grid layout to put on the screen.

        ordlayout = GridLayout()

        ordlayout.cols = 8

        ordlayout.row_default_height=20

        ordlayout.buttons={}

        ordlayout.btns1 = {}

        ordlayout.lbl = {}

        #The items I want on the screen are 1.)First item from list. 2.) Minus button.

        #3.) Current number of the item. 4.) Plus button.

        #I want these four buttons for each item.

        for i in self.countfoods:

            #Adds text for first item.

            ordlayout.add_widget(Label(text=i))

            #Adds a button for minus, linked to a unique dict value.

            ordlayout.buttons[str(i)] = Button(text="-")

            ordlayout.lbl[str(i)] = Label(text=str((self.countfoods[i])))

            #The below assigns the specific object location of each label

            #to a variable for passing to ocuntup and countdown.

            tempPlacement = str(ordlayout.lbl[str(i)])

            ordlayout.buttons[str(i)].bind(on_press=partial(self.updatedown, i))

            ordlayout.add_widget(ordlayout.buttons[str(i)])

            #Add the value that I want to update.

            ordlayout.add_widget(ordlayout.lbl[str(i)])

            #Adds a button for addition, but doesn't properly link it to a specific value.

            ordlayout.btns1[str(i)] = Button(text="+")

            ordlayout.btns1[str(i)].bind(on_press=partial(self.updateup, i))

            ordlayout.add_widget(ordlayout.btns1[str(i)])

        #Add that grid wit

            h values to the screen.

        self.add_widget(ordlayout)



    #Function used to change value down by one.

    def updatedown(self, event, i):

        self.countfoods[event] -= 1

        print (self.countfoods)



    #Function used to change value up by one.

    def updateup(self, event, i):

        self.countfoods[event] += 1

        print (self.countfoods)





#AdminOpt will be the screen used for

class AdminOpt(Screen):

    def __init__(self, **kwargs):

        super(AdminOpt, self).__init__(**kwargs)



#Will allow for opening and checking of created orders.

class OrdHist(Screen):

    pass



#This is purely the class used for managing the other screens.

class ScreenManagement(ScreenManager):

    pass





Main = Builder.load_file("Order Handler2.kv")





class Customer:

    def __init__(self, name, pricelist):

        self.name = name

        self.pricelist = pricelist





class SimpleKivy(App):

    def build(self):

        return Main





if __name__== "__main__":

    SimpleKivy().run()

asked Nov 21 '18 at 0:03

Mihslayer

Your updateup and updatedown methods need to explicitly change the text property of the Label in addition to changing the vale.

– John Anderson
Nov 21 '18 at 3:47

I was aware that the label needed updated, but I'm not sure on how to word the code to do so. I had thought something akin to- self.ordlayout.lbl[str(event)] += 1 However, this returns something akin to "self has no attribute ordlayout". I will update with the exact error when possible.

– Mihslayer
Nov 27 '18 at 14:16

add a comment |

import kivy

kivy.require('1.10.0')

from kivy.app import App

from kivy.uix.label import Label

from kivy.uix.button import Button

from kivy.uix.widget import Widget

from kivy.properties import ObjectProperty

from kivy.uix.behaviors import ButtonBehavior

from kivy.uix.gridlayout import GridLayout

from kivy.uix.scrollview import ScrollView

from kivy.uix.textinput import TextInput

from kivy.lang import Builder

from kivy.uix.dropdown import DropDown

from kivy.base import runTouchApp

from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition

from functools import partial

#The first screen the app opens to. Contains all other screen branches.

class MainScreen(Screen):

    pass



#NewOrder will be the screen used for choosing which

#items/and how many of each the customer wants added.

class NewOrder(Screen):

    def __init__(self, **kwargs):

        super(NewOrder, self).__init__(**kwargs)

        #This will eventually read/create a list of strings from a user-modified file.

        self.foods = ["Puppy", "Cat", "Fish"]

        #I create a dictionary linking a number to each item.

        self.countfoods = {}

        for i in self.foods:

            self.countfoods[i] = 0

        #Now I create a grid layout to put on the screen.

        ordlayout = GridLayout()

        ordlayout.cols = 8

        ordlayout.row_default_height=20

        ordlayout.buttons={}

        ordlayout.btns1 = {}

        ordlayout.lbl = {}

        #The items I want on the screen are 1.)First item from list. 2.) Minus button.

        #3.) Current number of the item. 4.) Plus button.

        #I want these four buttons for each item.

        for i in self.countfoods:

            #Adds text for first item.

            ordlayout.add_widget(Label(text=i))

            #Adds a button for minus, linked to a unique dict value.

            ordlayout.buttons[str(i)] = Button(text="-")

            ordlayout.lbl[str(i)] = Label(text=str((self.countfoods[i])))

            #The below assigns the specific object location of each label

            #to a variable for passing to ocuntup and countdown.

            tempPlacement = str(ordlayout.lbl[str(i)])

            ordlayout.buttons[str(i)].bind(on_press=partial(self.updatedown, i))

            ordlayout.add_widget(ordlayout.buttons[str(i)])

            #Add the value that I want to update.

            ordlayout.add_widget(ordlayout.lbl[str(i)])

            #Adds a button for addition, but doesn't properly link it to a specific value.

            ordlayout.btns1[str(i)] = Button(text="+")

            ordlayout.btns1[str(i)].bind(on_press=partial(self.updateup, i))

            ordlayout.add_widget(ordlayout.btns1[str(i)])

        #Add that grid wit

            h values to the screen.

        self.add_widget(ordlayout)



    #Function used to change value down by one.

    def updatedown(self, event, i):

        self.countfoods[event] -= 1

        print (self.countfoods)



    #Function used to change value up by one.

    def updateup(self, event, i):

        self.countfoods[event] += 1

        print (self.countfoods)





#AdminOpt will be the screen used for

class AdminOpt(Screen):

    def __init__(self, **kwargs):

        super(AdminOpt, self).__init__(**kwargs)



#Will allow for opening and checking of created orders.

class OrdHist(Screen):

    pass



#This is purely the class used for managing the other screens.

class ScreenManagement(ScreenManager):

    pass





Main = Builder.load_file("Order Handler2.kv")





class Customer:

    def __init__(self, name, pricelist):

        self.name = name

        self.pricelist = pricelist





class SimpleKivy(App):

    def build(self):

        return Main





if __name__== "__main__":

    SimpleKivy().run()

asked Nov 21 '18 at 0:03

Mihslayer

import kivy

kivy.require('1.10.0')

from kivy.app import App

from kivy.uix.label import Label

from kivy.uix.button import Button

from kivy.uix.widget import Widget

from kivy.properties import ObjectProperty

from kivy.uix.behaviors import ButtonBehavior

from kivy.uix.gridlayout import GridLayout

from kivy.uix.scrollview import ScrollView

from kivy.uix.textinput import TextInput

from kivy.lang import Builder

from kivy.uix.dropdown import DropDown

from kivy.base import runTouchApp

from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition

from functools import partial

#The first screen the app opens to. Contains all other screen branches.

class MainScreen(Screen):

    pass



#NewOrder will be the screen used for choosing which

#items/and how many of each the customer wants added.

class NewOrder(Screen):

    def __init__(self, **kwargs):

        super(NewOrder, self).__init__(**kwargs)

        #This will eventually read/create a list of strings from a user-modified file.

        self.foods = ["Puppy", "Cat", "Fish"]

        #I create a dictionary linking a number to each item.

        self.countfoods = {}

        for i in self.foods:

            self.countfoods[i] = 0

        #Now I create a grid layout to put on the screen.

        ordlayout = GridLayout()

        ordlayout.cols = 8

        ordlayout.row_default_height=20

        ordlayout.buttons={}

        ordlayout.btns1 = {}

        ordlayout.lbl = {}

        #The items I want on the screen are 1.)First item from list. 2.) Minus button.

        #3.) Current number of the item. 4.) Plus button.

        #I want these four buttons for each item.

        for i in self.countfoods:

            #Adds text for first item.

            ordlayout.add_widget(Label(text=i))

            #Adds a button for minus, linked to a unique dict value.

            ordlayout.buttons[str(i)] = Button(text="-")

            ordlayout.lbl[str(i)] = Label(text=str((self.countfoods[i])))

            #The below assigns the specific object location of each label

            #to a variable for passing to ocuntup and countdown.

            tempPlacement = str(ordlayout.lbl[str(i)])

            ordlayout.buttons[str(i)].bind(on_press=partial(self.updatedown, i))

            ordlayout.add_widget(ordlayout.buttons[str(i)])

            #Add the value that I want to update.

            ordlayout.add_widget(ordlayout.lbl[str(i)])

            #Adds a button for addition, but doesn't properly link it to a specific value.

            ordlayout.btns1[str(i)] = Button(text="+")

            ordlayout.btns1[str(i)].bind(on_press=partial(self.updateup, i))

            ordlayout.add_widget(ordlayout.btns1[str(i)])

        #Add that grid wit

            h values to the screen.

        self.add_widget(ordlayout)



    #Function used to change value down by one.

    def updatedown(self, event, i):

        self.countfoods[event] -= 1

        print (self.countfoods)



    #Function used to change value up by one.

    def updateup(self, event, i):

        self.countfoods[event] += 1

        print (self.countfoods)





#AdminOpt will be the screen used for

class AdminOpt(Screen):

    def __init__(self, **kwargs):

        super(AdminOpt, self).__init__(**kwargs)



#Will allow for opening and checking of created orders.

class OrdHist(Screen):

    pass



#This is purely the class used for managing the other screens.

class ScreenManagement(ScreenManager):

    pass





Main = Builder.load_file("Order Handler2.kv")





class Customer:

    def __init__(self, name, pricelist):

        self.name = name

        self.pricelist = pricelist





class SimpleKivy(App):

    def build(self):

        return Main





if __name__== "__main__":

    SimpleKivy().run()

label kivy

asked Nov 21 '18 at 0:03

Mihslayer

asked Nov 21 '18 at 0:03

Mihslayer

asked Nov 21 '18 at 0:03

Mihslayer

asked Nov 21 '18 at 0:03

Mihslayer

asked Nov 21 '18 at 0:03

Mihslayer

Your updateup and updatedown methods need to explicitly change the text property of the Label in addition to changing the vale.

– John Anderson
Nov 21 '18 at 3:47

I was aware that the label needed updated, but I'm not sure on how to word the code to do so. I had thought something akin to- self.ordlayout.lbl[str(event)] += 1 However, this returns something akin to "self has no attribute ordlayout". I will update with the exact error when possible.

– Mihslayer
Nov 27 '18 at 14:16

add a comment |

Your updateup and updatedown methods need to explicitly change the text property of the Label in addition to changing the vale.

– John Anderson
Nov 21 '18 at 3:47

I was aware that the label needed updated, but I'm not sure on how to word the code to do so. I had thought something akin to- self.ordlayout.lbl[str(event)] += 1 However, this returns something akin to "self has no attribute ordlayout". I will update with the exact error when possible.

– Mihslayer
Nov 27 '18 at 14:16

Your updateup and updatedown methods need to explicitly change the text property of the Label in addition to changing the vale.

– John Anderson
Nov 21 '18 at 3:47

I was aware that the label needed updated, but I'm not sure on how to word the code to do so. I had thought something akin to- self.ordlayout.lbl[str(event)] += 1 However, this returns something akin to "self has no attribute ordlayout". I will update with the exact error when possible.

– Mihslayer
Nov 27 '18 at 14:16

add a comment |

1 Answer
1

active

oldest

votes

Haven't been able to test this (your question is missing your kv file), but something like this might work:

#Function used to change value down by one.

def updatedown(self, i, button):

    self.countfoods[i] -= 1

    self.ordlayout.lbl[str(i)].text = str(self.countfoods[i])

    print (self.countfoods)



#Function used to change value up by one.

def updateup(self, i, button):

    self.countfoods[i] += 1

    self.ordlayout.lbl[str(i)].text = str(self.countfoods[i])

    print (self.countfoods)

You will also need to replace every occurence of ordlayout with self.ordlayout in the __init__() method.

As an aside, you don't need to do str(i) for your dictionary keys. In fact, you can use lists instead of dictionaries, if you prefer.

answered Nov 27 '18 at 19:11

John Anderson

2,9701515

add a comment |

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1 Answer
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1 Answer
1

active

oldest

votes

Haven't been able to test this (your question is missing your kv file), but something like this might work:

#Function used to change value down by one.

def updatedown(self, i, button):

    self.countfoods[i] -= 1

    self.ordlayout.lbl[str(i)].text = str(self.countfoods[i])

    print (self.countfoods)



#Function used to change value up by one.

def updateup(self, i, button):

    self.countfoods[i] += 1

    self.ordlayout.lbl[str(i)].text = str(self.countfoods[i])

    print (self.countfoods)

You will also need to replace every occurence of ordlayout with self.ordlayout in the __init__() method.

As an aside, you don't need to do str(i) for your dictionary keys. In fact, you can use lists instead of dictionaries, if you prefer.

answered Nov 27 '18 at 19:11

John Anderson

2,9701515

add a comment |

Haven't been able to test this (your question is missing your kv file), but something like this might work:

#Function used to change value down by one.

def updatedown(self, i, button):

    self.countfoods[i] -= 1

    self.ordlayout.lbl[str(i)].text = str(self.countfoods[i])

    print (self.countfoods)



#Function used to change value up by one.

def updateup(self, i, button):

    self.countfoods[i] += 1

    self.ordlayout.lbl[str(i)].text = str(self.countfoods[i])

    print (self.countfoods)

You will also need to replace every occurence of ordlayout with self.ordlayout in the __init__() method.

As an aside, you don't need to do str(i) for your dictionary keys. In fact, you can use lists instead of dictionaries, if you prefer.

answered Nov 27 '18 at 19:11

John Anderson

2,9701515

add a comment |

Haven't been able to test this (your question is missing your kv file), but something like this might work:

#Function used to change value down by one.

def updatedown(self, i, button):

    self.countfoods[i] -= 1

    self.ordlayout.lbl[str(i)].text = str(self.countfoods[i])

    print (self.countfoods)



#Function used to change value up by one.

def updateup(self, i, button):

    self.countfoods[i] += 1

    self.ordlayout.lbl[str(i)].text = str(self.countfoods[i])

    print (self.countfoods)

You will also need to replace every occurence of ordlayout with self.ordlayout in the __init__() method.

As an aside, you don't need to do str(i) for your dictionary keys. In fact, you can use lists instead of dictionaries, if you prefer.

answered Nov 27 '18 at 19:11

John Anderson

2,9701515

Haven't been able to test this (your question is missing your kv file), but something like this might work:

#Function used to change value down by one.

def updatedown(self, i, button):

    self.countfoods[i] -= 1

    self.ordlayout.lbl[str(i)].text = str(self.countfoods[i])

    print (self.countfoods)



#Function used to change value up by one.

def updateup(self, i, button):

    self.countfoods[i] += 1

    self.ordlayout.lbl[str(i)].text = str(self.countfoods[i])

    print (self.countfoods)

You will also need to replace every occurence of ordlayout with self.ordlayout in the __init__() method.

As an aside, you don't need to do str(i) for your dictionary keys. In fact, you can use lists instead of dictionaries, if you prefer.

answered Nov 27 '18 at 19:11

John Anderson

2,9701515

answered Nov 27 '18 at 19:11

John Anderson

2,9701515

answered Nov 27 '18 at 19:11

John Anderson

2,9701515

answered Nov 27 '18 at 19:11

John Anderson

2,9701515

add a comment |

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