Joomla Display Controller

The display controller is the main controller file for the component. As the component grows in complexity, a page's controller handles model fetching, form submissions, and so on.

The MVC concept is similar for back-end admin part and front-end site part.

Admin

Here, it simply sets its default view and leaves the rest to its parent controller (BaseController)

File Location: admin/src/Controller/DisplayController.php

namespace JohnSmith\Component\HelloWorld\Administrator\Controller;
defined('_JEXEC') or die;
use Joomla\CMS\MVC\Controller\BaseController;

class DisplayController extends BaseController 
{
 protected $default_view = 'hello';
 
 public function display($cachable = false, $urlparams = array()) 
 {
  return parent::display($cachable, $urlparams);
 }
}

Site

It contains some basic code to fetch and render a view. However, most of the work is delegated to the parent Joomla! class.

File Location: site/src/Controller/DisplayController.php

namespace JohnSmith\Component\HelloWorld\Site\Controller;
defined('_JEXEC') or die;

use Joomla\CMS\MVC\Controller\BaseController;
use Joomla\CMS\Factory;

class DisplayController extends BaseController 
{ 
 public function display($cachable = false, $urlparams = array()) 
 { 
  $document = Factory::getDocument();
  $viewName = $this->input->getCmd('view', 'login');
  $viewFormat = $document->getType();
 
  $view = $this->getView($viewName, $viewFormat);
 
  $view->document = $document;
  $view->display();
 }
}