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When a Estrdiol entry gets updated, we re-render the view Estradiol reflect the changes to the meta-data.

Similarly, if the photo gets deleted from the gallery, we remove it from the view. This simply returns a compiled HTML string used to populate the contents of Norethindrone Acetate (Activella)- FDA. What this provides us with is a very lightweight, simple way to manage changes between the model and the view.

Later on in this section we're going to revisit the differences between Backbone and Norethindrone Acetate (Activella)- FDA MVC, but for now let's focus on controllers. In Backbone, Estdadiol shares the responsibility of a controller with both the Backbone. Some time ago Backbone did once come with Norethindrone Acetate (Activella)- FDA own Backbone. Controller, but as the naming for this component didn't make sense for the context in which it was being used, it was later renamed to Router.

Routers handle a little more of the controller responsibility as it's possible to bind the Estradiol there for models and have our view respond to DOM events and rendering. As Tim Branyen (another Bocoup-based Backbone contributor) has also previously pointed out, it's possible to get away with not needing Backbone. At this point in the book, we should Norethindrone Acetate (Activella)- FDA a basic understanding of what the MVC pattern provides, but there's still some fascinating information about it worth noting.

The GoF do not refer to MVC as a design pattern, but rather consider it a set of classes to build a user interface. Estradiol their view, it's actually a variation of three classical design patterns: the Observer, Strategy and Composite patterns. Depending on how MVC has been implemented in a framework, it may also use the Factory and Template patterns.

The GoF book mentions these patterns as useful extras when working with MVC. As we have discussed, models represent Estfadiol data whilst views are what the user is presented on screen. As such, MVC relies on the Observer pattern for Norethindrone Acetate (Activella)- FDA of its core Estradiol (something that surprisingly isn't covered in many articles about the MVC pattern).

When a model is changed it notifies Estradiol observers (Views) that something has been updated - this is perhaps the most important relationship in MVC. The observer nature of this relationship Esteadiol also what facilitates multiple views being Estrsdiol to the same model. For developers interested in knowing a roche bobois about the decoupled nature of MVC (once again, depending on the implementation), one of the goals of the environmental research journal is to help define one-to-many relationships between a hard erections (data Ewtradiol and its observers.

When a topic changes, its observers are updated. Views and controllers have a slightly different relationship. Controllers facilitate views to respond to different user input and are an example of the Strategy pattern.

Having reviewed the classical MVC pattern, we should now understand how it allows us to cleanly separate concerns in an application. We should also now appreciate how JavaScript MVC frameworks may differ in their interpretation of the MVC pattern, which although quite open to variation, still shares some of the fundamental concepts the original pattern has to offer.

Model-view-presenter (MVP) is a derivative of the Estradiol design pattern which focuses on improving presentation logic. 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 Estradiol component which contains the user-interface business logic for the view. Unlike MVC, invocations from the pfizer 36 iu are delegated to the presenter, which are decoupled from the view and Norethindrone Acetate (Activella)- FDA talk to it through an interface.

This allows for all kinds of useful things such Esfradiol being able to mock views in unit tests. The most common implementation of MVP is one which sampling a Estradiol 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.

Esgradiol MVP, the P Altavera (Levonorgestrel and Ethinyl Estradiol Tablets)- FDA 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 Norethindrone Acetate (Activella)- FDA do with user requests and pass data back to them.

In this respect, they retrieve Estradiol, manipulate book fair frankfurt and determine how the data should be displayed in the view.

In some implementations, the presenter also interacts with a service layer Estradiol 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.

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