<p>Ext JS 4 is a JavaScript framework that provides resources to build Rich Internet Applications with great performance. Ext JS 4 has been packed with many new features and it is difficult to master, even for seasoned experts in Ext JS 3.<br /><br />Ext JS 4 First Look teaches you the main functional areas of Ext JS 4 that have significant new features, explains the new features and how to use them, while highlighting the differences between Ext JS 4 and the previous versions.<br /><br />This book will give you the knowledge to make the required changes to Ext JS 3 application to build a complete Ext JS 4 application.<br /><br />This book provides examples of how to load Ext JS components by demand, charts, grid, tree, forms and panels, new data model, themes and mvc architecture.<br /><br />Ext JS 4 First Look provides full examples and illustrations to help you easily learn the new features of Ext JS 4.</p>