shiny (version 1.0.0)

onFlush: Add callbacks for Shiny session events

Description

These functions are for registering callbacks on Shiny session events. onFlush registers a function that will be called before Shiny flushes the reactive system. onFlushed registers a function that will be called after Shiny flushes the reactive system. onSessionEnded registers a function to be called after the client has disconnected.

Usage

onFlush(fun, once = TRUE, session = getDefaultReactiveDomain())
onFlushed(fun, once = TRUE, session = getDefaultReactiveDomain())
onSessionEnded(fun, session = getDefaultReactiveDomain())

Arguments

fun

A callback function.

once

Should the function be run once, and then cleared, or should it re-run each time the event occurs. (Only for onFlush and onFlushed.)

session

A shiny session object.

Details

These functions should be called within the application's server function.

All of these functions return a function which can be called with no arguments to cancel the registration.