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Learning jQuery, Third Edition

You're reading from   Learning jQuery, Third Edition Create better interaction, design, and web development with simple JavaScript techniques

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Product type Paperback
Published in Sep 2011
Publisher Packt
ISBN-13 9781849516549
Length 428 pages
Edition 1st Edition
Tools
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Toc

Table of Contents (24) Chapters Close

Learning jQuery Third Edition
Credits
Foreword
About the Authors
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started FREE CHAPTER 2. Selecting Elements 3. Handling Events 4. Styling and Animating 5. Manipulating the DOM 6. Sending Data with Ajax 7. Using Plugins 8. Developing Plugins 9. Advanced Selectors and Traversing 10. Advanced Events 11. Advanced Effects 12. Advanced DOM Manipulation 13. Advanced Ajax JavaScript Closures Testing JavaScript with QUnit Quick Reference Index

Deferred objects


In jQuery 1.5, a concept known as a deferred object was introduced to the library. A deferred object encapsulates an operation that takes some time to complete. These objects allow us to easily handle situations in which we want to act when a process completes, but we don't necessarily know how long the process will take or even if it will be successful.

A new deferred object can be created at any time by calling the $.Deferred() constructor. Once we have such an object, we can perform long-lasting operations and then call the .resolve() or .reject() methods on the object to indicate the operation was successful or unsuccessful. It is somewhat unusual to do this manually, however. Typically, rather than creating our own deferred objects by hand, jQuery or its plugins will create the object and take care of resolving or rejecting it. We just need to learn how to use the object that is created.

Note

Creating deferred objects is a very advanced topic—more advanced than is appropriate...

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