Toolbars, data grids, combination boxes, and message boxes are among the controls offered by Ext JS. The ways in which elements are displayed on a webpage can be controlled by the layout managers. In addition, there are many features related to windows and forms.
Ext JS has an extendible, object-oriented framework and exceptional performance, and great presentation.
The user interface library within Ext JS can be complement Ruby on Rail, PHP, Java, .NET/ASP.NET, and almost all other server-side technologies.