Learning jQuery - Fourth Edition

Deferred objects

Deferred objects and their promises allow us to react to the completion of long-running tasks with a convenient syntax. They are discussed in detail in Chapter 11, Advanced Effects.

Object creation

Function	Description
$.Deferred([setupFunction])	Returns a new deferred object.
$.when(deferreds)	Returns a promise object to be resolved when the given deferred objects are resolved.

Methods of deferred objects

Method	Description
.resolve([args])	Sets the state of the object to resolved.
.resolveWith(context, [args])	Sets the state of the object to resolved while making the keyword this refer to context within callbacks.
.reject([args])	Sets the state of the object to rejected.
.rejectWith(context, [args])