This returns a list, which we assign to the variable entries, that is accessible within the index.html template. This blog post defines the concept of a Model-View-Controller (MVC) software design pattern and does a basic example Model-View-Controller in JavaScript/HTML/CSS. It responds to the request from the views and also responds to instructions from the controller to update itself. It is also the lowest level of the pattern which is responsible for maintaining data. The Controller is that part of the application that handles the user interaction.

It goes to the models (Legos) to retrieve the necessary items. The pictures above show what happens in a MVC web app when a user clicks a button, from the perspective of the user. MVC design allows for Separation of Concerns – dividing the logic up between the 3 buckets, so that each bucket can act independently. The frameworks that use MVC are Angular, Express, Django, Flask, Laravel, Ruby on rails, and others. Examples of programming languages that use MVC are C, C++, C#, Java, Ruby, Smalltalk, and many more.

What is the View in MVC?

For example, a Controller object will retrieve the customer info from the database. It manipulates data and sends back to the database or uses it to render the same data. The MVC design pattern aims to divide the application code into units of their own, so maintenance and optimization won’t be a hassle. MVC is a framework for thinking about programming, and for organizing your program’s files.

mvc programmer

Separation of concerns means each team member can work on their piece at the same time, because logic has been separated into buckets. Separation of concerns is also great for maitenance – developers can fix a bug in one piece of code, without having to check out the other pieces of code. The Model component corresponds to all the data-related logic that the user works with. This can represent either the data that is being transferred between the View and Controller components or any other business logic-related data.

The View code will define what the todos and lists looks like, visually. The Model in a todo app might define what a “task” is and that a “list” is a collection of tasks. Any representation of information such as a chart, diagram or table. Multiple views of the same information are possible, such as a bar chart for management and a tabular view for accountants. You’re ten years old, sitting on your family room floor, and in front of you is a big bucket of Legos. And some are yellow – big wide planes, like sheets of glass.

Making independent models and views makes code organization simple and easy to understand and keeps maintenance easier. Programmers can fix a bug in the view without changing the model code. The model-view-controller pattern has become a widely used architecture pattern for making web applications and other software products. In a full stack Express app, for example, developers would often divide the code into a model, controller, and client (view) folder. Later, the MVC pattern became popular with Java developers when WebObjects was ported to Java.

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