Python KivyMD: how to call a function using a button?

Question

im new to kivy and kivyMD, and i was trying to call a function that would print the email and password of a user. how would can i bind the function or use on_press in this code? i tried using on_pressed:root.function() method, but it doesnt work since my function is not written in the pr-emade ScreenManager

.PY

import... Builder.load_string(""" #:include kv/login.kv #:import utils kivy.utils #:import images_path kivymd.images_path """) class MyApp(MDApp): def __init__(self, **kwargs): self.title = "iKarate" self.theme_cls.theme_style = "Light" self.theme_cls.primary_palette = "Blue" self.sm = ScreenManager() super().__init__(**kwargs) def build(self): self.sm.add_widget(Factory.LoginScreen()) return self.sm def doThis(self): email = self.email password = self.password print(email, password) if __name__ == "__main__": MyApp().run()

.KV

#:kivy 1.11.1 <LoginScreen@Screen>: name: "login" BackgroundLayer: #MDCard: MDCard: orientation: "vertical" size_hint: [0.8, 0.6] pos_hint: {"center_x": 0.5, "center_y": 0.6} BoxLayout: orientation: "vertical" MDLabel: text: "Welcome to the log in page" text_size: self.size font_size: 25 bold: True halign: "center" valign: "middle" Image: size_hint_y: 10 source: "kv/image.png" MDTextField: id: email hint_text: "E-mail" MDTextField: id: password hint_text: "Password" password: True MDFillRoundFlatButton: id: btn text: "Sign In" width: dp(200) pos_hint: {"center_x": .5} on_press:print("pressed") <BackgroundLayer@BoxLayout>: orientation: "vertical" BoxLayout: orientation: "vertical" canvas.before: Color: rgba: utils.get_color_from_hex("#00146e") Rectangle: pos: 0, self.center_y + self.height/3 - 50 size: (self.width,70) BoxLayout: orientation: "horizontal"

on_press:print("pressed") successfully prints "pressed"

Fyzzy good · Accepted Answer · 2020-05-09 10:02:54Z

3

Use this if you call a function from App class:

on_press: app.doThis()

And use this if you call a function from Screen class:

on_press: root.doThis()

answered May 9, 2020 at 10:02

Fyzzy good

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3 Comments

Zenast Over a year ago

thanks! now the function is called, but the text field data was not passed. how do i pass it now?

Fyzzy good Over a year ago

It's better to try looking for examples first. Personally, I created a method in the screen class to pick up text and do something with it. Code: self.ids.<your_obj_id>.text. Don't forget to set the answer as correct)

Zenast Over a year ago

i figured it out. i just called doThis(email,password) in the KV file, and edited the parameters in the python file. now the KV file passes the data using the function call itself

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