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Scheduler - Web APIs | MDN

Limited availability

Note: This feature is available in Web Workers.

The Scheduler interface of the Prioritized Task Scheduling API provides methods for scheduling prioritized tasks.

A Scheduler can be accessed from the global object using Window.scheduler or WorkerGlobalScope.scheduler within a worker.

None.

Scheduler.postTask()

Adds a task to the scheduler as a callback, optionally specifying a priority, delay, and/or a signal for aborting the task.

Scheduler.yield() Experimental

Yields control of the main thread back to the browser, returning a promise that resolves to continue execution where it left off.

If the feature is defined, an instance of this object is returned by the globalThis property in both workers and the main thread.

The code below shows a simple task that resolves with the text 'Task executing'. This text is logged on success. The code also shows a catch block, which would be required in more complex code to handle when a task is aborted or throws an error.

if ("scheduler" in this) {
  // Post task with default priority: 'user-visible' (no other options)
  // When the task resolves, Promise.then() logs the result.
  scheduler
    .postTask(() => "Task executing")
    .then((taskResult) => console.log(`${taskResult}`)) // Log result
    .catch((error) => console.error(`Error: ${error}`)); // Log errors
}

For more comprehensive example code see Prioritized Task Scheduling API > Examples.

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