MVC (Model View Controller)

MVC (Model View Controller)

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Definition

MVC separates application into three components: Model, View, and Controller. The Controller handles user input and coordinates Model-View updates.

flowchart LR
    subgraph View
        V[View]
    end
    subgraph Controller
        C[Controller]
    end
    subgraph Model
        M[Model]
    end
    
    V -->|user input| C
    C -->|updates| M
    M -->|data| C
    M -.->|notifies| V
    C -->|formats data| V

Flow

  1. View receives user input, notifies Controller
  2. Controller updates Model based on user input
  3. Model sends updated data back through the chain (active view)

View Types

There are two types of View depending on how it interacts with Model:

Passive View

  • View gets data only through the Controller
  • View is not aware of Model
  • Controller acts as the sole mediator

Active View

  • Model notifies View of changes
  • View queries Model for updated data
  • Controller only handles input events

Disadvantages

  • Controller becomes bloated as complexity grows
  • Tight coupling between Controller and View in some implementations

Components

Variants

Recent Notes

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