Ext JS, a cross-browser JavaScript library for building Rich Internet Applications (RIA), has emerged from the mix of JavaScript frameworks, libraries and object-oriented development techniques as a one of the clear leaders. Ext JS combines an extensive library of super-high-quality widgets, an intuitive, extensible component model, and an easy-to-use API to create a full, rock-solid platform for JavaScript-based web apps. Ext JS has been adopted by such household names as Adobe, Aetna, Amazon.com, Best Buy Hallmark, Panasonic, Pixar Animation Studios, Siemens, Sony, and Visa.Ext JS in Action teaches the reader about Ext from the ground up. By following the common design patterns demonstrated in the Ext source and in many commercial applications, the...