You're reading from Professional JavaScript for Web Developers Discover an easy-to-learn guide to upgrade your JavaScript skills

Product type Paperback

Published in Nov 2019

Publisher Wiley

ISBN-13 9781119366447

Length 1144 pages

Edition 4th Edition

Languages

JavaScript

Tools

Combine

Concepts

Web Programming

Author (1):

Matt Frisbie

View More author details

Table of Contents (37) Chapters

COVER FREE CHAPTER

FOREWORD

INTRODUCTION

1 What Is JavaScript?

2 JavaScript in HTML

3 Language Basics

4 Variables, Scope, and Memory

5 Basic Reference Types

6 Collection Reference Types

7 Iterators and Generators

8 Objects, Classes, and Object-Oriented Programming

9 Proxies and Reflect

10 Functions

11 Promises and Async Functions

12 The Browser Object Model

13 Client Detection

14 The Document Object Model

15 DOM Extensions

16 DOM Levels 2 and 3

17 Events

18 Animation and Graphics with Canvas

19 Scripting Forms

20 JavaScript APIs

21 Error Handling and Debugging

22 XML in JavaScript

23 JSON

24 Network Requests and Remote Resources

25 Client-Side Storage

26 Modules

27 Workers

28 Best Practices

A ES2018 and ES2019

B Strict Mode

C JavaScript Libraries and Frameworks

D JavaScript Tools

INDEX

END USER LICENSE AGREEMENT

SUMMARY

Ajax is a method for retrieving data from the server without refreshing the current page. Ajax has the following characteristics:

The central object responsible for the growth of Ajax is the XMLHttpRequest (XHR) object.
This object was created by Microsoft and first introduced in Internet Explorer 5 as a way to retrieve XML data from the server in JavaScript.
Since that time, Firefox, Safari, Chrome, and Opera have all duplicated the implementation, and the W3C has written a specification defining the XHR behavior, making XHR a Web standard.
Though there are some differences in implementations, the basic usage of the XHR object is relatively normalized across all browsers and can therefore safely be used in web applications.

One of the major constraints on XHR is the same-origin policy that limits communication to the same domain, using the same port, and with the same protocol. Any attempts to access resources outside of these restrictions cause a security error, unless an approved...