Synchronous and Asynchronous Calls with the AJAX Toolkit

The AJAX Toolkit allows you to issue synchronous or asynchronous calls. Asynchronous calls allow the client side process to continue while waiting for a call back from the server. To issue an asynchronous call, you must include an additional parameter with the API call, referred to as a callback function. Once the result is ready, the server invokes the callback method with the result.