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Why do we need to use a JS MVC framework(backbone) if we are already using a backend MVC framework(e.g Django or ROR). I can’t understand the concept of two MVC frameworks and how they fit together. I thought all front-end related files or logic(html, css, js) come under the views component of the back-end framework. Can someone explain this in simpler terms?
Backbone lies in the client [browser], in order to have fast interaction and experience.
This way you can take advantage of real-time communication via websockets, or LocalStorage for example.
Using a client MVC [MVVM better, in Backbone’s case] implies that you just supply a RESTful set of resource from the server [which you can reuse in many other context], and not a full HTML generation stack.
Said that, client side MVC is closer to desktop/mobile UI-oriented MVC implementations [see Cocoa / iOS] than to web-oriented MVC [Symfony, Django, RoR…].