[Question] Is there a way to update the pages externally?

[lkaijie]

Question

Is there anyway I can add rows or call functions externally? I tried finding something similar in the docs but no luck so far.

Code sample

import flet as ft

def main(page: ft.Page):
    t = ft.Text(value="Hello, world!", color="green")
    page.controls.append(t)
    
    
    def add_row(text):
        row = ft.Text(value=text)
        page.add(row)
        
    
    add_row("Hello, world!")
    
    page.update()

ft.app(target=main)
# Is there anyway to add info or call functions such as the add_row in this case externally?

Error message

No response

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• I have searched for answers to my question both in the issues and in previous discussions.

[ndonkoHenri]

What is meant by 'externally'?

[lkaijie]

from outside of the main function in this case, if the flet app is part of bigger application

[DavMelchi]

Maybe this could help ?

import flet as ft

def main(page: ft.Page):
    t = ft.Text(value="Hello, world!", color="green")
    page.controls.append(t)
    
    
    def add_row(text):
        row = ft.Text(value=text)
        return row
    
    row1 = add_row("Hello, world with function add_row 1!")
    row2 = add_row("Hello, world with function add_row 2!")
    

    page.add(row1,row2)

ft.app(target=main)

[heximing]

I have the same question. What I do is to put that "bigger application" inside Flet Page (inside def main(page: ft.Page)). For example:

import flet as ft

class GreeterControl(ft.UserControl):
    def __init__(self):
        super().__init__()
        self.button1 = ft.ElevatedButton(text="Start Test", on_click=self.start_clicked, disabled=False)
        self.button2 = ft.OutlinedButton(text="Stop Test", on_click=self.stop_clicked, disabled=True)

    def build(self):
        a_column = ft.Column(controls=[ft.Text(value="(Title) Test (Title)", italic=False, selectable=False,
                                               style=ft.TextThemeStyle.DISPLAY_MEDIUM), ])
        a_column.controls.append(ft.Text(value="Some text here..."))
        a_column.controls.append(ft.Text(value="More text here..."))
        a_column.controls.append(ft.Row(controls=[self.button1, self.button2]), )
        return a_column

    def start_clicked(self, e):
        dummy_def("Start")
        print("Running a test...")
        self.button1.disabled = True
        self.button2.disabled = False
        self.update()

    def stop_clicked(self, e):
        dummy_def("Stop")
        print("Running a test...")
        self.button1.disabled = False
        self.button2.disabled = True
        self.update()

def main(page: ft.page):
    page.title = "Flet example"
    page.scroll = "always"
    page.window_width = 999
    page.window_height = 666
    page.bgcolor = "#FFFFF8E1"
    page.add(
        ft.Column(
            [
                GreeterControl(),
                ft.Text(value="Whatever you want to put here"),
                ft.Text(value="Even more things here")
            ],
            alignment=ft.alignment.center
        )
    )

def dummy_def(in_msg: str = ""):
    print("this is \"dummy_def(\"{0}\")\" outside the Class, meaning \"{0}\" button is clicked.".format(in_msg))

if __name__ == '__main__':
    ft.app(target=main)

[TingTingin]

you would either have to start a loop before than listens for some message or bind the add row function to a button or other action that is triggered in the ui

[TingTingin]

it would be easier to help if you gave an example of where and why your trying to call a function that isn't working with the current setup