Ext JS 4 is the most comprehensive upgrade to the framework we've ever released. From completely overhauled packages like Data and Charting, to widgets like the Tree and Grid that were rewritten from the ground up, Ext JS 4 represents…

Although most modern mobile devices have good hardware specs, almost all of them are still lacking in areas like memory — especially compared to their desktop counterparts. Others either have week graphics processing units (GPUs), or the browser doesn’t properly…

The grid components have been rewritten from the ground up for Ext JS 4 and will provide numerous benefits over the 3.x versions. The 4.0 grid includes greatly improved performance and flexibility, so extending it and adding new functionality will…