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Whilst both MVC and MVP target the separation of concerns across multiple components, there are some fundamental differences between them.

For the purposes of this summary we will focus on the version of MVP most suitable for web-based architectures. The P in MVP stands for presenter. It's a component which contains the user-interface business logic for the view.

Unlike MVC, invocations from the view are delegated to the presenter, which are decoupled from the view and instead talk to it through an interface. This allows for all kinds of useful things such as being able to mock views in unit tests. The most common implementation of MVP is one which uses a Passive View (a view which is for all intents and purposes "dumb"), containing little to no logic.

If MVC and MVP are different it is because the C and P do different things. In MVP, the P observes models and updates views when models change. The P effectively binds models to views, a responsibility which was previously held by controllers in MVC. Solicited by a view, presenters perform any work to do with user requests and pass data back to them. In this respect, they retrieve data, manipulate it and determine how the data should be displayed in the view. In some implementations, the Clobazam Tablets and Oral Suspension (Onfi)- Multum also interacts with a service layer to persist data (models).

Models may trigger events but it's the presenters role to subscribe to them so that it can update the view. In this passive architecture, we have no concept of direct data binding. Views expose setters which presenters can use to set data. The benefit of this change from MVC is that it increases the testability of our application and provides a more clean separation between the view and Clobazam Tablets and Oral Suspension (Onfi)- Multum model.

This isn't however without its costs as the lack of data binding support in the pattern can often mean having to take care of this task separately. Although a common implementation of a Passive View is for the view to implement an interface, there are variations on it, including the use of events which can decouple the View from the Presenter a little Clobazam Tablets and Oral Suspension (Onfi)- Multum. As we don't have the interface construct in JavaScript, we're using more a protocol than an explicit interface here.

It's technically still an API and it's probably fair for us to refer to it as an interface from that perspective. There is also a Supervising Controller variation of MVP, which is closer to the MVC and MVVM patterns as it provides data-binding from the Model directly from the View. Key-value observing (KVO) plugins (such as Derick Bailey's Backbone.

ModelBinding plugin) tend to bring Backbone out of the Passive View and more into the Supervising Controller or MVVM variations. MVP Clobazam Tablets and Oral Suspension (Onfi)- Multum generally used most often in enterprise-level applications where it's necessary to reuse as much presentation logic as possible. Applications with very complex views and a great deal of user interaction may find that MVC doesn't quite fit the bill here as solving this problem may mean heavily relying on multiple controllers.

In MVP, all of this complex logic can be encapsulated in a presenter, which can simplify maintenance greatly. As MVP views are defined through an interface and the interface is technically the only point of contact between the system and the view (other than a presenter), this pattern also allows developers to write presentation logic without needing to wait for designers to produce layouts and graphics for the application.

Depending on the implementation, MVP may be easier to automatically unit test than MVC. Manic depressive psychosis reason often cited for this is that the presenter can be used as a complete mock of the user-interface and so it can be unit tested independent of other components.

In my experience Clobazam Tablets and Oral Suspension (Onfi)- Multum really depends on the languages we are implementing MVP in (there's quite a difference between opting for Clobazam Tablets and Oral Suspension (Onfi)- Multum for a JavaScript project over one for say, ASP. Johnson cleaning the end of the day, the underlying concerns we may have with MVC will likely hold true for MVP given that the differences Clobazam Tablets and Oral Suspension (Onfi)- Multum them are mainly semantic.

As long as we are cleanly separating concerns into models, views and controllers (or presenters) we should be achieving most of the same benefits regardless of the variation we opt for. There are very few, if any architectural JavaScript frameworks that claim to implement the MVC or MVP patterns in their classical form as many JavaScript developers don't view MVC and MVP as being mutually exclusive (we are actually more likely to see MVP strictly implemented when looking at web frameworks such as ASP.

Backbone contributor Irene Ros (of Boston-based Bocoup) subscribes to this way of thinking as when she separates views out into their own distinct components, she needs something to actually assemble them for her. This could either be a controller route (such as a Backbone. Router, covered later in the book) or a callback in response to data being fetched.

That said, some developers do however feel that Backbone. Their view is that:A response to this could be that the view can also just be a View (as per MVC) because Backbone is flexible enough to let it be used for multiple purposes.

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Comments:

08.06.2019 in 16:37 Kajigor:
Yes, really. And I have faced it. We can communicate on this theme. Here or in PM.