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Ext JS is a cross-browser JavaScript library for building rich internet applications. It includes
  • High performance, customizable UI widgets
  • Well designed and extensible Component model
  • An intuitive, easy to use API
Ext JS supports all major web browsers including
  • Internet Explorer 6+
  • FireFox 1.5+ (PC, Mac)
  • Safari 3+
  • Opera 9+ (PC, Mac)
It has strong support for database connections, Web Service, AJAX integration plus support for Adobe. EXT.js also covers the full range of Web widgets. Even better, EXT.js has several integration features. First, the various EXT.js widgets work well among themselves and rarely have namespace conflicts or clash. This is very important and the same cannot be said for some versions of other frameworks. The second integration feature is that - EXT.js provides adapters for working with such popular JavaScript frameworks as jQuery, prototype, Scriptaculous and YUI.
Third integration feature is on the backend where EXT.js extensions and/or tools are provided for working with such Web resources as
  • Adobe AIR - built in adapters for AIR in EXT.js core library
  • Cold Fusion - has ColdFire, CFJSON and other links
  • Delphi/Pascal - has EXTPascal wrapper
  • Java - there is EXT.GWT and other resources
  • Lotus Notes - EXT.nd and other interfaces
  • .NET - 3 libraries for interfacing
  • PHP, Perl, and Python - JSON and other interfaces to Django(Python)
  • Ruby on Rails - JSON + XML support plus plugin
In sum the direct integration to other backend web resources goes well beyond EXT.js's built in support for JSON and other data connections. And in general, for a new framework, EXT.js sports top notch integration capabilities.
EXT.js is a relatively new AJAX JavaScript framework that appears to be gaining favor based on
  • Completeness of its GUI and backend features
  • The range of integrations with other frameworks and backend server tools
  • The robustness of its routines for reliability and speed of operation.