Developing a MVC Component/Adding a variable request in the menu type

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Articles in this serie[edit]


This tutorial is part of the Developing a Model-View-Controller (MVC) Component for Joomla!1.6 tutorial. You are encouraged to read the previous parts of the tutorial before reading this.

Adding a variable request in the menu type[edit]

For the moment, the displayed message is always Hello World!. Joomla!1.6 gives the possibility to add parameters to menu types. In our case, this is done in the site/views/helloworld/tmpl/default.xml file:


<?xml version="1.0" encoding="utf-8"?>





			<option value="1">Hello World!</option>
			<option value="2">Good bye World!</option>


Note two important information:

  • the request group that indicates mandatory fields
  • the array parameter that indicates

The model has to be modified in order to choose between the two different messages:


// No direct access to this file
defined('_JEXEC') or die('Restricted access');
// import Joomla modelitem library
// inherit the JModelItem class
class HelloWorldModelHelloWorld extends JModelItem
	 * @var string msg
	protected $msg;
	 * Get the message
	 * @return string The message to be displayed to the user
	public function getMsg() 
		if (!isset($this->msg)) 
			$id = JRequest::getInt('id');
			switch ($id) 
			case 2:
				$this->msg = 'Good bye World!';
			case 1:
				$this->msg = 'Hello World!';
		return $this->msg;

Also modify your helloworld.xml file to indicate the new version:


<?xml version="1.0" encoding="utf-8"?>
<extension type="component" version="1.6.0" method="upgrade">
	<name>Hello World!</name>
	<creationDate>November 2009</creationDate>
	<author>John Doe</author>
	<copyright>Copyright Info</copyright>
	<license>License Info</license>
	<description>Description of the Hello World component ...</description>

	<files folder="site">

		<menu>Hello World!</menu>
		<files folder="admin">

Packaging the component[edit]

Content of your code directory

Create a compressed file of this directory or directly download the archive and install it using the extension manager of Joomla!1.6. You can add a menu item of this component using the menu manager in the backend.