JavaScript for Web Developers: Understanding the Basics

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2023

M. SimonJavaScript for Web Developershttps://doi.org/10.1007/978-1-4842-9774-2_10

10. Project: An Introduction to Ajax

Mark Simon¹  

(1)

Ivanhoe, VIC, Australia

 

If you’re trying to run this project without a web server, you’re probably out of luck. JavaScript cannot make Ajax requests to different domains unless the other domain specifically allows this. This is called the Same-Origin Policy.

Modern browsers tend to regard different documents opened locally (via File: Open ...) as coming from different domains, even if they’re in the same folder. As a result the Ajax requests will be denied. Files fetched from the same location using the http:// protocol are ...