Which javascript mvc

With so many devices and operating systems now on the market, developers are clamouring for simple ways to create apps using HTML5 technology. Thankfully, a number of platforms make cross-platform development eminently approachable.

Any developer worth their salt will know the value of frameworks in JavaScript programming. Countless hours can be lost re-writing code that is functional rather than creative or aimed at realising the business logic of an app. Such code is vital, but MVC frameworks make the laborious job of implementing it effortless. Want To Learn More? First Name. HMVC allows for modularity and reusability of codes.

Contents are displayed using a hierarchical Model. For instance, the developer can add other controllers for deleting cart items and updating cart items, etc. However, the MVA model makes the Controller a mediator. Hence, Model and View must flow through the Controller. The Controllers are called Adapters. Although this method may look strict as View and Model must flow through the Controller, this allows for easy debugging.

A simple illustration of the MVA architecture is shown in the example below. From the example above, we have two Adapters. One Adapter is responsible for converting user text to uppercase, while the second Adapter is responsible for converting user text to lowercasing.

In this Model, the Controller is replaced by a middle man called the Presenter. The Presenter handles all of the logic in the application.

The View and Model must flow through the Presenter. With MVP, you can create various Views which behave differently but share the same presenter. This allows you to create different UI User Interface with the same functionality. This is why user interface designers love to incorporate this model into their designs.

The example below shows a simple illustration of MVP architecture. From the example above, the class model contains our data which is the text to be displayed. While the Presenter which connects the Model to the View initializes the Model and returns the value in the View. So, if a user tries to change the initial text in the View , the Presenter updates the Model which returns the updated data to be displayed by the View.

In this architecture, the Model stores data and information required by the application. The ViewModel is similar to the Controller, as it acts as a connection between the Model and the View. It is in charge of updating the Model when a user sends input and it can convert data from the Model before sending it to the View. This architecture allows for developers to build simultaneously. The example below illustrates how the MVVM architecture converts input from a user to upper casing and displays content entered by a user from one input field to another.

From the example above, our Model is the class Model that consists of a text Input Something. The Model also has an observer which observes all the changes that occur in the Model. JavaScript frameworks are a major part of modern front-end web development. The key is the field name and the value is what the user entered into the field.

In this case, we need to display an error message on the page. This display will be a View, and will expect data to be passed to it from the Controller. The View will use that data to construct the error message that is shown to the user. Then, the function loops through the message data and inserts it into the page. Our Model stores our data and can tell us whether the data validates. We have a View, the error message, that we use to display success or failure and pass in any text to be shown to the user.

The last step is to validate the form when the user tries to submit it. With our event bound to our controller action, we capture the data, validate it, and present any errors. The data array contains the field values. The Model validates the data, and returns a list of invalid fields.

If any fields are invalid, the form submission is cancelled and the message data is passed to the View. After that, the View displays the message on the page. In our validation example, the MVC structure works well with progressive enhancement. The JavaScript simply augments the page to help it do its thing.

By separating our code, fewer components will need to understand what is happening on the page. This separation can actually make progressive enhancement easier, since there are fewer interventions in the HTML document. With an MVC structure like this, we might want to load the page and then to do an Ajax request to pull in the initial data from the server to populate the initial view. However, this can create the illusion of a slow interface, since two requests need to be made before the user can interact with the page: the first request to load the page and the second request to load the data into the page.

Instead, render the page normally—with static data. This is your initial state. The data contained within the initial state is also stored as JavaScript at the bottom of the page. Once the page loads, the JavaScript layer of your application is already set to go. Additional data can even be preloaded, if not initially seen. The additional load time is minimal but the user can then move forward and back without having to request new data from the server.

Having a deeper understanding of how this pattern can be applied to your work should help, whether you roll your own or use an existing framework. Whether you need a formal framework in place or not depends on how complex the application is. It can be as flexible as you want it to be. For small applications where you only have a few functions, this type of separation is surely overkill. The larger your application gets, though, the more it benefits from the separating code into Model, View, and Controller.

In my experience MVC is a synonym for overflowing complexity. While with a direct hacker approach you need usually one piece of code, with the MVC pattern you need at least three. Leading to more code, more complexity, more download-time, more interfacing, harder debugging….

I like the agile programming of small collaborating components some of them actually meet the MVC concept…. You always need server-side validation and trying to do this in Javascript is an invitation to disaster. Future extensions to HTML might allow browsers to implement some of this directly based on the metadata. More time is spent reading code than writing it. Adding new models to edit is a matter of editing one component, not three.

Instead, there was too much dependence between components, making it harder to work on as the application got more complex. I have yet to find an answer. One idea behind MVC is that a system should be designed to be able to accommodate a large variety of recurring patterns when in fact, they rarely recur. The time it takes to develop a robust MVC far outweighs the benefits, as the time required to maintain and debug it will trump any times it saves in writing code that uses the MVC.

I agree with virtually all of what proxiss wrote earlier. In other words, why should we have to develop such complex structures to account for patterns that have become so commonplace?

Validating email? Any language by now that is used on the web should have this built-in. Using JavaScript as an example, why after nearly 15 years of existence does it not inherently do something as simple as email validation?

The problem exists in the language itself not keeping pace with demand; therefore we have to come up with workarounds until it does so. I consider objects, functions, methods, etc. I say the problem is that the tools we are using are not updated as often as they should be which forces us to come up with these workarounds. Elegance lies in simplicity. JavaScript is popular because it is dead simple to use, not because it can be bent into a framework.

A programming language itself has no place in dealing with ever-changing specifications for things like input validation. Imagine having to update your JavaScript engine every time one of the many RFC specifications change, when you could simply link to an updated library. Also, how often do RFC specs change? Not often. I hardly think that something as essential as email validation is too much to ask to have in a language like JavaScript. I agree with catchmyfame. Why bother with generalization on every single subject.

Seems they are not afraid of RFC changes…. I think, the idea is very good, but in most cases the usage of a MVC principle is just an overdose of script except in large scaled projects.

I really like the way, code is seperated in its logic functions, but in the case of JavaScript, there are better ways. I mean writing some pieces of generalized code, that give me the amount of flexibility can have nearly the same result, without making the issue that complex. We're going to make this really nice and simple to understand what class pertains to what part of MVC.

I'll make a Model class, View class, and Controller class, which takes in the model and view. The app will be an instance of the controller. If you're not familiar with how classes work, read Understanding Classes in JavaScript. Let's focus on the model first, as it's the simplest of the three parts. It doesn't involve any events or DOM manipulation. It's just storing and modifying data.

We have an addTodo , editTodo , deleteTodo , and toggleTodo. These should all be very self explanatory - add appends a new todo to the array, edit finds the id of the todo to edit and replaces it, delete filters a todo out of the array, and toggle switches the complete boolean property.

Since we're doing this all in the browser, and app is accessible from the window global , you can test these out easily, typing something like:. That's good enough for the model right now. In the end, we'll store the todos in local storage to make it semi-permanent, but for now the todos will just refresh any time you refresh the page.

As we can see, the model only deals with the actual data, and modifying that data. It doesn't understand or have any knowledge the input - what's modifying it, or the output - what will end up displaying.

At this point you have everything you need for a fully functioning CRUD app, if you manually type all your actions through the console, and view the output in the console. We're going to create the view by manipulating the DOM - the document object model. Since we're doing this in plain JavaScript without the aid of React's JSX or a templating language, it will be kind of verbose and ugly, but such is the nature of manipulating the DOM directly.

Anything relating to it should be in the view. The first thing I'll do is just make helper methods to retrieve an element and create an element. So far so good. Now in the constructor, I'm going to set up all the things I need for my view. That'll be:. I'm using underscores in the method names to signify that they're private local methods that won't be used outside of the class.

All the setup's done now. The most complex part is displaying the todo list, which is the part that will change every time a change is made to the todos.