Ext JS is a mature JavaScript web application framework that provides modern UI widgets and an advanced MVC architecture. It helps you manage tedious boilerplate and minimize hand-coded HTML and browser incompatibilities.

Practical Ext JS 4 will get you up and running, using Ext JS 4.2 for your projects, as quickly as possible. After a quick refresher on some JavaScript basics, you will get to grips with Ext JS 4’s OO concepts (such as mixins) and familiarize yourself with its UI components and layout. You’ll learn all the core features of the Ext JS framework, such as its MVC architecture, theming and styling your applications, and displaying data through components such as grids, trees, and charts. You’ll use the Ext JS components and create an entire application from scratch by following the many practical examples. Finally, you’ll learn about unit testing and packaging to build and deploy better applications.

Using Ext JS you can easily build desktop-style interfaces in your web applications. Over 400,000 developers are working smarter with Ext JS and yet most of them fail to exercise all of the features that this powerful JavaScript library has to offer.

The new Sencha Ext JS 5 library offers hundreds of components and APIs to build robust applications and fulfills the critical needs of customers all around the world. The new version 5 is packed with new themes and the MVVM architecture that allows you to connect the model layer to the view and automatically update the model when the view is modified and vice versa.

Using JavaScript framework is the new way of creating rich, cross-browser, intuitive UI interfaces, in a fraction of the time that it would otherwise normally take. A cross-browser web application with header, footer, left column section with links, a content with a CSS grid/table, and a form with few text fields and a submit button can be done with ease using the JavaScript framework.

Ext JS is one of the most famous JavaScript frameworks used to create rich interactive web applications using techniques such as Ajax, DHTML, JSON, and DOM scripting.