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You're reading from  Professional JavaScript for Web Developers - Fourth Edition

Product typeBook
Published inNov 2019
Reading LevelBeginner
PublisherWiley
ISBN-139781119366447
Edition4th Edition
Languages
JavaScript
Concepts
Web Programming
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Author (1)
Matt Frisbie
Matt Frisbie
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Matt Frisbie

Matt Frisbie has worked in web development for over a decade. During that time, he's been a startup co-founder, an engineer at a Big Four tech company, and the first engineer at a Y Combinator startup that would eventually become a billion-dollar company. As a Google software engineer, Matt worked on both the AdSense and Accelerated Mobile Pages (AMP) platforms; his code contributions run on most of the planet's web browsing devices. Prior to this, Matt was the first engineer at DoorDash, where he helped lay the foundation for a company that has become the leader in online food delivery. Matt has written two books and recorded two video series for O'Reilly and Packt, speaks at frontend meetups and web casts, and is a level 1 sommelier. He majored in Computer Engineering at the University of Illinois Urbana-Champaign. Matt's Twitter handle is @mattfriz.
Read more about Matt Frisbie

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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...

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Professional JavaScript for Web Developers - Fourth Edition
Published in: Nov 2019Publisher: WileyISBN-13: 9781119366447
© 2019 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Matt Frisbie

Matt Frisbie has worked in web development for over a decade. During that time, he's been a startup co-founder, an engineer at a Big Four tech company, and the first engineer at a Y Combinator startup that would eventually become a billion-dollar company. As a Google software engineer, Matt worked on both the AdSense and Accelerated Mobile Pages (AMP) platforms; his code contributions run on most of the planet's web browsing devices. Prior to this, Matt was the first engineer at DoorDash, where he helped lay the foundation for a company that has become the leader in online food delivery. Matt has written two books and recorded two video series for O'Reilly and Packt, speaks at frontend meetups and web casts, and is a level 1 sommelier. He majored in Computer Engineering at the University of Illinois Urbana-Champaign. Matt's Twitter handle is @mattfriz.
Read more about Matt Frisbie

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