how to plus integer value in loop
To access the elements in a simple way you must set id, in this case I will set one to the TextInput
associated with the numeric input, also you must place a filter to accept only numerical values:
TextInput:
id: number_input
text: root.col_data4
width: 300
input_filter: 'int'
Then the method test()
is reduced to the following:
class User(Screen):
total_value = ObjectProperty(None)
def add_more(self):
self.ids.rows.add_row()
def test(self):
rows = self.ids.rows
total = 0
for row in rows.children:
text = row.ids.number_input.text
total += int(text) if text != "" else 0 # validate if the entry is not empty
self.total_value.text = str(total)
To be able to update the values automatically we will link the text change to a function, and in it we will call test()
, in order to access the test we must place an id to Screen:
User:
id: user
total_value: total_value
[...]
to be able to access screen from App.get_running_app()
:
class Row(BoxLayout):
button_text = StringProperty("")
col_data3 = StringProperty("")
col_data4 = StringProperty("")
def __init__(self, *args, **kwargs):
super(Row, self).__init__(*args, **kwargs)
self.ids.number_input.bind(text=self.on_text)
def on_text(self, text_input, value):
App.get_running_app().root.test()
Complete Code:
demo.py
from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import BooleanProperty, ListProperty, StringProperty, ObjectProperty, NumericProperty
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
Window.clearcolor = (0.5, 0.5, 0.5, 1)
Window.size = (500, 400)
class User(Screen):
total_value = ObjectProperty(None)
def add_more(self):
self.ids.rows.add_row()
def test(self):
rows = self.ids.rows
total = 0
for row in rows.children:
text = row.ids.number_input.text
total += int(text) if text != "" else 0
self.total_value.text = str(total)
class Row(BoxLayout):
button_text = StringProperty("")
col_data3 = StringProperty("")
col_data4 = StringProperty("")
def __init__(self, *args, **kwargs):
super(Row, self).__init__(*args, **kwargs)
self.ids.number_input.bind(text=self.on_text)
def on_text(self, text_input, value):
App.get_running_app().root.test()
class Rows(BoxLayout):
row_count = 0
def __init__(self, **kwargs):
super(Rows, self).__init__(**kwargs)
self.add_row()
def add_row(self):
self.row_count += 1
self.add_widget(Row(button_text=str(self.row_count)))
class Test(App):
def build(self):
self.root = Builder.load_file('demo.kv')
return self.root
if __name__ == '__main__':
Test().run()
demo.kv
<Row>:
size_hint_y: None
height: self.minimum_height
height: 40
Button:
text: root.button_text
size_hint_x: None
top: 200
TextInput:
text: root.col_data3
width: 300
TextInput:
id: number_input
text: root.col_data4
width: 300
input_filter: 'int'
<Rows>:
size_hint_y: None
height: self.minimum_height
orientation: "vertical"
User:
id: user
total_value: total_value
BoxLayout:
orientation: "vertical"
padding : 20, 5
BoxLayout:
orientation: "horizontal"
#padding : 10, 10
spacing: 10, 10
size: 450, 40
size_hint: None, None
Label:
size_hint_x: .2
text: "Number"
text_size: self.size
valign: 'bottom'
halign: 'center'
Label:
size_hint_x: .4
text: "name"
text_size: self.size
valign: 'bottom'
halign: 'center'
Label:
size_hint_x: .4
text: "Value"
text_size: self.size
valign: 'bottom'
halign: 'center'
ScrollView:
Rows:
id: rows
BoxLayout:
orientation: "horizontal"
padding : 10, 5
spacing: 10, 10
size: 200, 40
size_hint: None, None
Label:
size_hint_x: .7
text: "Total value"
TextInput:
id: total_value
on_focus:root.test()
BoxLayout:
orientation: "horizontal"
size_hint_x: .2
size_hint_y: .2
Button:
text: "+Add More"
on_press: root.add_more()