jQuery's Deferred object provides a way to register multiple callbacks into callback queues, check the status of requests, and coordinate multiple AJAX calls concurrently.
jQuery Deferred and Promises
Coordinate multiple simultaneous async requests with $.when and .done().
Key Takeaways: jQuery Deferred and Promises
Mastering jQuery Deferred and Promises helps you write clean and reliable jQuery code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
jQuery Deferred and Promises Code Example
jQuery$.when(
$.get("/api/user/profile"),
$.get("/api/notifications")
).done(function(userRes, notifRes) {
console.log("Both asynchronous requests completed successfully.");
});Output
Triggers callback once both API requests complete
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