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Asynchronous JavaScript Requests

Free Course

Fetch Data Asynchronously

Related Nanodegree Program

Introduction to Programming

About this course

This course covers everything a developer needs to know to asynchronously send and receive data in their web applications. You'll dive into how asynchronous requests work by using the XHR object to create and send asynchronous requests for image and news article data. Then, you'll see how you can perform async requests more easily using third-party libraries and APIs like jQuery's Ajax and the Fetch API.

What you will learn

  1. Lesson 1: Ajax with XHR
    • Learn why you should use asynchronous data requests
    • Use the XHR (XMLHTTPRequest) object to send and receive data asynchronously
  2. Lesson 2: Ajax with jQuery
    • Compare using XHR with using a third-party library like jQuery's Ajax
    • Send and receive data using jQuery's Ajax methods
    • Learn how jQuery's Ajax works under the hood
  3. Lesson 3: Ajax with Fetch
    • Use JavaScript promises to create a fetch request and handle the data asynchronously
    • Learn how to handle errors for failed requests

Prerequisites and requirements

This course is ideal for students with intermediate level knowledge of JavaScript. You should have experience working with JavaScript's Object Oriented (prototypal inheritance) capabilities and using native JavaScript Promises. To brush up on these skills, check out Object Oriented JavaScript and JavaScript Promises.

See the Technology Requirements for using Udacity.

Why take this course?

Retrieving data asynchronously is now the norm with apps like Twitter, Facebook, and Google sending and retrieving mountains of data without having to stop and wait for processes to finish or to reload the page. Create smooth, modern web applications by using Ajax techniques to retrieve data asynchronously.

Learn with the best.

  • Richard Kalehoff
    Richard Kalehoff