requestIdleCallback method

int requestIdleCallback(
  1. IdleRequestCallback callback, [
  2. IdleRequestOptions options
])

The window.requestIdleCallback() method queues a function to be called during a browser's idle periods. This enables developers to perform background and low priority work on the main event loop, without impacting latency-critical events such as animation and input response. Functions are generally called in first-in-first-out order; however, callbacks which have a timeout specified may be called out-of-order if necessary in order to run them before the timeout elapses.

You can call requestIdleCallback() within an idle callback function to schedule another callback to take place no sooner than the next pass through the event loop.

Note: A timeout option is strongly recommended for required work, as otherwise it's possible multiple seconds will elapse before the callback is fired.

Implementation

external int requestIdleCallback(
  IdleRequestCallback callback, [
  IdleRequestOptions options,
]);