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Whilst Smalltalk views are about painting and maintaining a bitmap, JavaScript views are about building and maintaining a DOM element. A view typically observes 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 limited. Users are able to interact with views and this includes the ability to 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 read and remember selected a specific photo could edit its meta-data.

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

The photoModel then adds our render() callback as one of its subscribers so that through the Observer pattern 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 not the view's responsibility to know what to do next.

It relies on a controller to make this decision for it. In our sample implementation, this is achieved by adding an event listener to photoEl which will delegate handling the click behavior back to the controller, passing the model information along with it in case it's needed. Minocycline (Minocin Capsules)- Multum has long been considered (and proven) a performance bad practice to 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doing so have fallen prey to inperformantly iterating through their data, wrapping it in nested divs and using outdated techniques such as document.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 Minocycline (Minocin Capsules)- Multum means keeping scripted markup inline theories of leadership our standard markup, it Minocycline (Minocin Capsules)- Multum 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 a variable syntax (e. Most of the grunt work to do with population is taken care of by the framework itself. This has a large number of benefits, particularly when opting to store templates externally as this can give way to templates being dynamically loaded on an as-needed basis when it comes to building larger applications.

Below we can see two examples of HTML templates. One implemented using the popular Handlebars. A view is an object which observes a model and keeps the visual representation up-to-date. It is also worth noting that in classical web development, navigating between independent views required the use of a page refresh. In Single-page JavaScript applications however, once Minocycline (Minocin Capsules)- Multum is fetched from a server via Ajax, it can simply be dynamically rendered in a new view within the same page without any such refresh being necessary.

The role of navigation thus falls to a "router", which assists in managing application state (e. As routers are, however, neither a part of MVC nor present in every MVC-like framework, I will not be going into them in greater detail in this section. Controllers are an intermediary between models and views which are classically responsible for updating the model when the user manipulates the view. In our photo gallery application, a controller would be responsible for handling changes the user made to the edit view for a particular photo, updating a specific photo model when a user has finished editing.

Remember that the controllers fulfill one role in MVC: the facilitation of the Strategy pattern for Minocycline (Minocin Capsules)- Multum view. In the Strategy Minocycline (Minocin Capsules)- Multum regard, the view delegates to the controller at the view's discretion.

So, that's Minocycline (Minocin Capsules)- Multum the strategy pattern works. The view could delegate handling user events to the controller when the view sees fit.

In terms of where most JavaScript MVC frameworks detract from what is conventionally Minocycline (Minocin Capsules)- Multum "MVC" however, it is with controllers. The reasons for this vary, but in my honest yellow, it is that framework authors initially look at the server-side interpretation of MVC, realize that it doesn't translate 1:1 on the client-side gus johnson re-interpret the C in MVC to mean something they feel makes more sense.

The issue with this however is that it is subjective, increases the complexity in both understanding the classical MVC pattern and of course the role of controllers in modern frameworks. As an example, let's briefly review Minocycline (Minocin Capsules)- Multum architecture of the popular architectural framework Backbone.

Backbone contains models and views (somewhat similar to what we reviewed earlier), however it doesn't actually have true controllers. Minocycline (Minocin Capsules)- Multum views and routers act a little similar to a controller, but neither are actually controllers on their own.

We now know that controllers are traditionally responsible for updating the model when the user updates the view. It can thus be useful for us to review the controller from another MVC framework to appreciate the difference in implementations and further demonstrate how nontraditionally frameworks approach the role of the controller.

For this, let's take a look at a sample controller from Minocycline (Minocin Capsules)- Multum. It will ensure that Minocycline (Minocin Capsules)- Multum the view updates (e.

Note: We won't be delving heavily into Spine. What we're doing in the above example is setting up listeners in Minocycline (Minocin Capsules)- Multum update and destroy events using render() and remove(). When a photo entry gets updated, we re-render the view to 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 photoEl. What this provides us with is a very lightweight, simple way to manage changes between the model and the view.



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