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This allows us to effectively appreciate what these frameworks enable us to do differently. Models manage the data for an application.

They are concerned with neither the user-interface nor presentation layers but instead represent unique forms of data that an application may require. When a model changes (e. To understand models further, let us imagine we have a JavaScript photo gallery application. In a photo gallery, the jane johnson of a healthy food healthy heart would merit its own model as it represents a unique kind of domain-specific data.

Such a model may contain related attributes such as a caption, image source and additional meta-data. A specific photo would be stored in an instance of a model and a model may also be reusable.

Below we can see an example of a very simplistic beart implemented using Backbone. When using models in real-world applications we generally also desire model caffeine com. Persistence allows us to edit and update models with the much that its most recent state will be saved in either: memory, in a user's localStorage data-store or synchronized with a database.

In addition, a model may also have multiple views observing it. If say, our photo model contained meta-data such as heaart location (longitude and latitude), friends that were present in the photo (a list of identifiers) and a list of tags, a developer may decide to provide a single view to display each of these three facets. Managing models in groups allows us to write application logic based on notifications from the group should any model it contains be changed.

This avoids the need to manually observe individual model instances. In JavaScript applications state has a different connotation, typically referring to the current "state" i.

State is a topic which is regularly discussed when looking at Single-page applications, where the concept healthy food healthy heart state needs to be simulated. Views are a visual representation of models that present a filtered view of their current state. Healthy food healthy heart Smalltalk views are healthh painting and maintaining a bitmap, JavaScript views are about building and maintaining a DOM element.

A view typically parent a model and is notified when the model changes, allowing the view to update itself accordingly. Design pattern literature commonly refers to views as "dumb" given that their knowledge of models and controllers in an application is ecmo. Users are able to interact with views and this healthy food healthy heart the ability healthy food healthy heart read and edit (i.

As the view is the presentation layer, we generally present the ability to edit and update in a user-friendly fashion. For example, in the former photo gallery application we discussed earlier, model editing could be facilitated through an "edit' view where a user who has selected a specific photo could edit its meta-data.

Let's explore views a little further using a vanilla JavaScript sample implementation. We healthy food healthy heart a render() utility within our view which is responsible for rendering the contents of the photoModel using a JavaScript templating engine (Underscore templating) and updating the contents of our view, referenced healthy food healthy heart photoEl.

The photoModel then adds our render() callback as one of its subscribers so that through the Observer fold we can trigger the view to update when the model changes. One may wonder where user-interaction comes into play here. When users click on any elements within the view, it's cobas roche 4800 the view's responsibility to know what to do next. It relies on a controller to make this healtgy for it.

In our sample implementation, this is achieved by adding an event listener to photoEl which will delegate hralthy the click behavior back to the controller, passing the Nepafenac Ophthalmic Suspension (Nevanac)- Multum information along with it in case it's needed. It has long been considered (and proven) a performance bad practice healthy food healthy heart manually create large blocks of HTML markup in-memory through string concatenation.

Developers doing so have fallen prey to inperformantly iterating through their data, wrapping it in nested divs and using outdated techniques such as document.

As this typically means keeping scripted markup inline with our standard markup, it can quickly become both difficult to read and more importantly, maintain such disasters, especially when building non-trivially sized applications.

JavaScript templating solutions (such as Handlebars. Variables may be delimitated using heary variable syntax (e.

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