HMVC: an Introduction

MadhukarAnand.com

This tutorial is an introduction to the Hierarchical Model View Controller(HMVC) pattern, and how it applies to web application development. For this tutorial, I will use examples provided from the CodeIgniter from Scratch series and demonstrate how HMVC can be a valuable modification to your development process. This introduction assumes you have an understanding of the Model View Controller (MVC) pattern.

What is HMVC?

HMVC is an evolution of the MVC pattern used for most web applications today. It came about as an answer to the salability problems apparent within applications which used MVC. The solution presented in the JavaWorld web site, July 2000, proposed that the standard Model, View, and Controller triad become layered into a “hierarchy of parent-child MCV layers“. The image below illustrates how this works:

HMVC-structure

Each triad functions independently from one another. A triad can request access to another triad via their controllers. Both…

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