How to set cookie in event callback?

[EntangledLabs]

Question

How would one set a cookie in an event callback? I understand that app.storage exists but I'm playing around with some cookies directly. I cannot seem to be able to set any cookies without a Response (FastAPI/Starlette), and I cannot send responses without failing to render a page.

Here's minimum code to demonstrate:

from nicegui import ui
from fastapi.requests import Request

@ui.page('/example')
def example(request: Request):
    def callback():
        """set cookie here"""
    with ui.card().classes('absolute-center'):
        ui.button('example button', on_click=callback)

Any help would be greatly appreciated.

[rodja]

There are two kinds of cookies. In a callback you can only set client-side cookies (via ui.run_javascript). HTTP-only cookies require a Response, so they must be set server-side during page load and can not be modified later.