We've designed the data layer and the UI layer, the glue that dictates how the two interact, and tackled the remaining bits of the client requirements that look like they may cause trouble. We're in good shape to start putting our fingers on the keyboard in our favorite text editor and show how the design can be implemented in Ext JS.
With the introduction of view models in Ext JS, the concept of data binding has also been brought to prominence. In short, data binding binds one value to another value. When the first changes, the second updates automatically. Two-way data binding means that when either value changes, the other updates accordingly.
On the whole, Ext JS has implemented this idea via view models. A UI component may have its title bound to a value and when this value is updated by another part of the application, the title automatically changes. This removes the need for the developer to wire up change events and ensures that data...