Claiming that more than a million developers use its framework and tools for both desktop and mobile application development, Sencha says Ext JS has comprehensive cross-browser support and an improved data package — all based on a modern architecture.
"Ext JS 4 is the most advanced framework we've ever shipped, it gives enterprises and development shops tremendous firepower to build the next generation of cross-platform web apps," said Abe Elias, Sencha's CTO. "Whether you're using our new UI components, the new charting package, or theming your application, Ext JS 4 makes it easy to build an advanced, highly functional app that harnesses the power and ubiquity of the web, regardless of which browser you're using."
Sencha says that Ext JS 4 is leading the industry trend away from relying on plug-ins, which includes Apple's decision to ship the latest Macs without browser plug-ins.
Ext JS 4 supports Chrome 5+, Firefox 3+, Internet Explorer 6+, Safari 3.2+, and Opera 10+. On modern browsers, Ext JS 4 harnesses the power of HTML5 with capabilities such as CSS3 styling and falls back to alternative solutions on legacy browsers.
Ext JS 4 adds more than 270 new APIs, 35 new classes, as well as what the company calls 'extensive' new documentation. Ext JS 4 also includes enhancements to the data package that enable developers to use a model-view-controller (MVC) application architecture. The new MVC enables apps to leverage features like Infinite Scrolling and the new, smarter Grid Components to add what is being described as an entirely new level of interactivity to web apps.