ExtJS : JavaScript application framework

Ext JS is a pure JavaScript application framework for building interactive cross platform web applications using techniques such as Ajax, DHTML and DOM scripting. Ext JS helps you build data-intensive, cross-platform web apps for desktops, tablets, and smartphones. Originally built as an add-on library extension of Yahoo! User Interface Library (YUI). Ext JS includes interoperability with jQuery and Prototype. Beginning with version 1.1, Ext JS retains no dependencies on external libraries, instead making their use optional.

Sencha Ext JS provides everything a developer needs to build data-intensive, cross-platform web applications. Ext JS leverages HTML5 features on modern browsers while maintaining compatibility and functionality for legacy browsers.

Ext JS features hundreds of high-performance, pre-tested and integrated UI components including calendar, grids, charts and more. The Ext JS Grid and Advanced Charting package can handle millions of records with ease. The framework includes a robust data package that can consume data from any back-end data source. With Sencha Pivot Grid and D3 adapter, organizations can add leading-edge visualization and analytics capabilities to their web applications.

The rich set of Ext JS tools and themes help improve development productivity and accelerate the delivery of great looking web applications. Tools are available to help with application design, development, theming, and debugging as well as build optimization and deployment.

Ext JS includes a set of GUI-based form controls (or "widgets") for use within web applications:

• text field and textarea input controls
• date fields with a pop-up date-picker
• numeric fields
• list box and combo boxes
• radio and checkbox controls
• html editor control
• grid contro
• tree control
• tab panels
• toolbars
• desktop application-style menus
• region panels to allow a form to be divided into multiple sub-sections
• sliders
• vector graphics charts

Ext.NET is an ASP.NET component framework integrating the Ext library, current version (as of September 2015) is 3.2.1 which integrates ExtJS version 5.1.1

Ext JS version 6.0 of the Ext JS framework was released on March 29, 2016. It merges the Sencha Touch (mobile) framework into Ext JS.