run async function in an endless loop

[v479038280]

Question

how to make async handler run in an endless loop,

import asyncio
from nicegui import ui

async def async_task():
    ui.notify('Asynchronous task started')
    await asyncio.sleep(5)
    ui.notify('Asynchronous task finished')

ui.button('start async task', on_click=async_task)

ui.run()

[falkoschindler]

Hi @v479038280,

You can start any async function using app.on_startup:

async def loop():
    while True:
        await async_task()

app.on_startup(loop)

You could also use a ui.timer. Note that this acts like a UI element: When used in global scope (i.e. on the auto-index page), it runs immediately. But when used in a @page function, it only runs when somebody visits that page:

ui.timer(1.0, async_task)  # runs immediately as part of the auto-index page

@ui.page('/timer')
async def timer_page():
    ui.timer(1.0, async_task)  # runs per client connection on /timer