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As more and more of our work is done through a web browser, and more businesses build web rather than desktop applications, users want web applications that look and feel like desktop applications. Ext JS is a JavaScript library that makes it (relatively) easy to create desktop-style user interfaces in a web application, including multiple windows, toolbars, drop-down menus, dialog boxes, and much more. Both Commercial and Open Source licenses are available for Ext JS.
Ext JS has the unique advantage of being the only client-side UI library that also works as an application development library. Learning Ext JS will help you create rich, dynamic, and AJAX-enabled web applications that look good and perform beyond the expectations of your users.
From the building blocks of the application layout, to complex dynamic Grids and Forms, this book will guide you through the basics of using Ext JS, giving you the knowledge required to create rich user experiences beyond typical web interfaces. It will also provide you with the tools you need to use AJAX, by consuming server-side data directly into the many interfaces of the Ext JS component library.
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March 03, 2009: I was waiting for the book release and was eager to see more details on how ExtJS works. However, the book serves more like a tutorial to use different components. It does not explain why things are the way they are in ExtJS. There is not much reasoning behind what all is happening and how to make best use of the underlying architecture.
This book serves only as an introduction to ExtJS, nothing more. Perhaps the tutorials on ExtJS.com are more insightful.Also, if you are not familiar with JS you will not be able to grasp most of the stuff. So make sure you have good understanding of JS before picking up this book otherwise it will not be of much help to you.Bottomline: Serves as an introduction to ExtJS. Recommend for beginners only.