reactive.effect

from shiny import App, Inputs, Outputs, Session, reactive, ui

app_ui = ui.page_fluid(
    ui.input_action_button("btn", "Press me!")
)

def server(input: Inputs, output: Outputs, session: Session):
    @reactive.effect
    def _():
        ui.insert_ui(
            ui.p("Number of clicks: ", input.btn()),
            selector="#btn",
            where="afterEnd",
        )

app = App(app_ui, server)

Restrict execution

무조건실행되지 않게, @reactive.event(input.btn) 추가

def server(input: Inputs, output: Outputs, session: Session):
    @reactive.effect
    @reactive.event(input.btn)
    def _():
        ui.insert_ui(
            ui.p("Number of clicks: ", input.btn()),
            selector="#btn",
            where="afterEnd",
        )

app = App(app_ui, server)