View source

== Introduction ==

In the first tutorial of this series, creating a simple view-controller component using the Joomla! 1.5 CMS framework was demonstrated.

In the first tutorial, the greeting was hardcoded into the view. This doesn't follow the MVC pattern exactly because the view is intended to only display the data, and not contain it.

In this second part of the tutorial we will demonstrate how to move this out of the view and into a model. In future tutorials we will demonstrate the power and flexibility that this design pattern provides.

== Creating the Model ==

The concept of model gets its name because this class is intended to represent (or 'model') some entity. In our case, our first model will represent a 'hello', or a greeting. This is in line with our design thus far, because we have one view ('hello'), which is a view of our greeting.

The naming convention for models in the Joomla! framework is that the class name starts with the name of the component (in our case 'hello', followed by 'model', followed by the model name. Therefore, our model class is called HelloModelHello.

At this point, we will only model one behaviour of our hello, and that is retrieving the greeting. We will thus have one method, called getGreeting(). It will simply return the string 'Hello, World!'.

The code for the view at site/models/hello.php:
 
<source lang="php"><?php
/**
 * Hello Model for Hello World Component
 * 
 * @package    Joomla.Tutorials
 * @subpackage Components
 * @link http://docs.joomla.org/Developing_a_Model-View-Controller_Component_-_Part_2
 * @license    GNU/GPL
 */

// No direct access

defined( '_JEXEC' ) or die( 'Restricted access' );

jimport( 'joomla.application.component.model' );

/**
 * Hello Model
 *
 * @package    Joomla.Tutorials
 * @subpackage Components
 */
class HelloModelHello extends JModel
{
    /**
    * Gets the greeting
    * @return string The greeting to be displayed to the user
    */
    function getGreeting()
    {
        return 'Hello, World!';
    }
}</source>

You will notice a line that starts with jimport. The jimport function is used to load files from the Joomla! framework that are required for our component. This particular statement will load the file /libraries/joomla/application/component/model.php. The '.'s are used as directory separators and the last part is the name of the file to load. All files are loaded relative to the libraries directory. This particular file contains the class definition for the JModel class, which is necessary because our model extends this class.

Now that we have created our model, we must modify our view so that it uses it to obtain the greeting.

== Using the Model ==

The Joomla! framework is setup in such a way that the controller will automatically load the model that has the same name as the view and will push it into the view. Since our view is called 'Hello', our 'Hello' model will automatically be loaded and pushed into the view. Therefore, we can easily retrieve a reference to our model using the JView::getModel() method. (If the model had not followed this convention, we could have passed the model name to [http://api.joomla.org/Joomla-Framework/Application/JView.html#getModel JView::getModel()])

Our previous view code contained the lines:
 
<source lang="php">$greeting = "Hello World!";</source>

To take advantage of our model, we change this line to:
 
<source lang="php">$model =& $this->getModel();
$greeting = $model->getGreeting();</source>

The complete view now looks like:
 
<source lang="php"><?php
/**
 * @package    Joomla.Tutorials
 * @subpackage Components
 * @link http://docs.joomla.org/Developing_a_Model-View-Controller_Component_-_Part_2
 * @license    GNU/GPL
*/

// No direct access

defined( '_JEXEC' ) or die( 'Restricted access' );

jimport( 'joomla.application.component.view');

/**
 * HTML View class for the HelloWorld Component
 *
 * @package    HelloWorld
 */

class HelloViewHello extends JView
{
    function display($tpl = null)
    {
        $model =& $this->getModel();
        $greeting = $model->getGreeting();
        $this->assignRef( 'greeting',	$greeting );

        parent::display($tpl);
    }
}</source>

=== Adding the File to the Package ===

All that remains is to add an entry to the XML file so that our new model will be copied. The Joomla! framework will look for our model in the models directory, so the entry for this file will look like (it should be added to the site section):

<source lang="php"><filename>models/hello.php</filename></source>

Our new hello.xml file will look like:
 
<source lang="xml"><?xml version="1.0" encoding="utf-8"?>
<install type="component" version="1.5.0">
 <name>Hello</name>
 <!-- The following elements are optional and free of formatting conttraints -->
 <creationDate>2007-02-22</creationDate>
 <author>John Doe</author>
 <authorEmail>john.doe@example.org</authorEmail>
 <authorUrl>http://www.example.org</authorUrl>
 <copyright>Copyright Info</copyright>
 <license>License Info</license>
 <!--  The version string is recorded in the components table -->
 <version>1.01</version>
 <!-- The description is optional and defaults to the name -->
 <description>Description of the component ...</description>

 <!-- Site Main File Copy Section -->
 <!-- Note the folder attribute: This attribute describes the folder
      to copy FROM in the package to install therefore files copied
      in this section are copied from /site/ in the package -->
 <files folder="site">
  <filename>controller.php</filename>
  <filename>hello.php</filename>
  <filename>index.html</filename>
  <filename>models/hello.php</filename>
  <filename>models/index.html</filename>
  <filename>views/index.html</filename>
  <filename>views/hello/index.html</filename>
  <filename>views/hello/view.html.php</filename>
  <filename>views/hello/tmpl/default.php</filename>
  <filename>views/hello/tmpl/index.html</filename>
 </files>

 <administration>
  <!-- Administration Menu Section -->
  <menu>Hello World!</menu>

  <!-- Administration Main File Copy Section -->
  <files folder="admin">
   <filename>hello.php</filename>
   <filename>index.html</filename>
  </files>  

 </administration>
</install></source>

== Conclusion ==

We now have a simple MVC component. Each element is very simple at this point, but provides a great deal of flexibility and power.

== Articles in this Series ==
[[Developing a Model-View-Controller Component - Part 1]]

[[Developing a Model-View-Controller Component - Part 2 - Adding a Model]]

[[Developing a Model-View-Controller Component - Part 3 - Using the Database]]

[[Developing a Model-View-Controller Component - Part 4 - Creating an Administrator Interface]]

[[Developing a Model-View-Controller Component - Part 5 - Basic Backend Framework]]

[[Developing a Model-View-Controller Component - Part 6 - Adding Backend Actions]]

== Contributors ==
* staalanden

== Download ==

The component can be downloaded at: [http://joomlacode.org/gf/download/frsrelease/8109/29434/com_hello2_01.zip com_hello2_01]

[[Category:Development]]