Book Image

Learning jQuery 3 - Fifth Edition

By : Jonathan Chaffer, Karl Swedberg
Book Image

Learning jQuery 3 - Fifth Edition

By: Jonathan Chaffer, Karl Swedberg

Overview of this book

If you are a web developer and want to create web applications that look good, are efficient, have rich user interfaces, and integrate seamlessly with any backend using AJAX, then this book is the ideal match for you. We’ll show you how you can integrate jQuery 3.0 into your web pages, avoid complex JavaScript code, create brilliant animation effects for your web applications, and create a flawless app. We start by configuring and customising the jQuery environment, and getting hands-on with DOM manipulation. Next, we’ll explore event handling advanced animations, creating optimised user interfaces, and building useful third-party plugins. Also, we'll learn how to integrate jQuery with your favourite back-end framework. Moving on, we’ll learn how the ECMAScript 6 features affect your web development process with jQuery. we’ll discover how to use the newly introduced JavaScript promises and the new animation API in jQuery 3.0 in great detail, along with sample code and examples. By the end of the book, you will be able to successfully create a fully featured and efficient single page web application and leverage all the new features of jQuery 3.0 effectively.
Table of Contents (23 chapters)
Title Page
About the Authors
About the Reviewer
Customer Feedback

Using the jqXHR object

When an Ajax request is made, jQuery determines the best mechanism available for retrieving the data. This transport could be the standard XMLHttpRequest object, the Microsoft ActiveX XMLHTTP object, or a <script> tag.

Because the transport used can vary from request to request, we need a common interface in order to interact with the communication. The jqXHR object provides this interface for us. It is a wrapper for the XMLHttpRequest object when that transport is used, and in other cases, it simulates XMLHttpRequest as best it can. Among the properties and methods it exposes are:

  • .responseText or .responseXML, containing the returned data
  • .status and .statusText, containing a status code and description
  • .setRequestHeader() to manipulate the HTTP headers sent with the request
  • .abort() to prematurely halt the transaction

This jqXHR object is returned from all of jQuery's Ajax methods, so we can store the result if we need access to any of these properties or methods...