rx_runloop: Run reactive event loop

In jcheng5/rxtools: Tools and helpers for reactive programming with Shiny

Description

Setting up reactive graphs does nothing until something actually causes reactive events to be processed. This is handled for you when writing Shiny apps, but it might also be useful to run reactives outside of Shiny, for testing and experimentation if nothing else. This function runs an event loop for reactivity and timer actions. From an interactive console, interrupt it using Escape or Ctrl+C (or whatever the usual interrupt gesture is in your R environment). You can also stop the loop programmatically by calling rx_stoploop.

Usage

rx_runloop(..., before_tick = NULL, after_tick = NULL)

rx_stoploop()

Arguments

...	Currently ignored. (Used to force other arguments to be passed by name, not by position.)
before_tick	A no-argument callback function that will be called before work is done for each iteration.
after_tick	A no-argument callback function that will be called after work is done for each iteration.

Examples

counter <- rx_value(0)

rx_exec({
  print(counter())
  if (counter() == 10)
    rx_stoploop()
})

rx_exec({
  invalidateLater(100)
  isolate({
    counter(counter() + 1)
  })
})

rx_runloop()

jcheng5/rxtools documentation built on May 18, 2019, 10:22 p.m.