jQuery Deferred
jQuery's Deferred object is a chainable utility for managing asynchronous operations. It is jQuery's predecessor to native Promises, with a similar API.
jQuery
Intermediate
4 min read
Introduction to jQuery Deferred
Example
const deferred = $.Deferred();
deferred.done(function(value) {
console.log("Resolved:", value);
}).fail(function(reason) {
console.log("Rejected:", reason);
});
// Resolve it later
setTimeout(() => deferred.resolve("success!"), 1000); Pro Tip
jQuery Deferred objects are compatible with native Promise in jQuery 3.x.