Introduction to MVC Architecture
The Model-View-Controller (MVC) design pattern is an architectural software pattern widely used to develop user interfaces. It divides a software application into three interconnected components, separating the internal representation of data from the way information is presented to and accepted from the user.
By dividing the application into these components, developers can write clean, modular, and maintainable code. Each component has a distinct responsibility, which helps minimize coupling and facilitates easier testing and development.
The Three Components of MVC
- Model
- Represents the data structure and business logic. It handles data retrieval, storage, and processing, completely independent of the user interface.
- View
- Displays the visual representation of the Model's data to the user. It represents what the user sees on screen, such as pages, tables, forms, and charts.
- Controller
- Acts as the bridge or traffic director. It accepts user input, processes requests, updates the Model based on user commands, and updates the View to reflect the new state.
How MVC Works (Diagram Flow)
Below is a conceptual workflow of the MVC architecture:
- User Interaction: The user interacts with the View (e.g., clicks a button or submits a form).
- Request Handling: The Controller catches the event and processes the input.
- Data Modification: The Controller updates the state in the Model.
- State Notification: The Model updates and notifies the View of changes (or the Controller triggers the View update).
- UI Rendering: The View fetches the updated data from the Model and renders the new user interface.