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Difference between revisions of "Developing a MVC Component/Adding a variable request in the menu type"

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< Archived:Developing a MVC Component
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<layout
 
<layout
 
 
title="com_helloworld_helloworld_view_default_title">
 
title="com_helloworld_helloworld_view_default_title">
 
 
<message>com_helloworld_helloworld_view_default_desc</message>
 
<message>com_helloworld_helloworld_view_default_desc</message>
 +
</layout>
  
</layout>
 
 
<fields
 
<fields
 
group="request"
 
group="request"

Revision as of 10:03, 9 November 2009

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Articles in this serie[edit]

Indroduction[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:

site/views/helloworld/tmpl/default.xml

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

<metadata>

	<layout
		title="com_helloworld_helloworld_view_default_title">
		<message>com_helloworld_helloworld_view_default_desc</message>
	</layout>

	<fields
		group="request"
		array="true"
	>
		<field
			id="id"
			name="id"
			type="list"
			label="HelloWorld_HelloWorld_Msg_Label"
			description="HelloWorld_HelloWorld_Msg_Desc"
			default="1"
		>
			<option value="1">Hello World!</option>
			<option value="2">Good bye World!</option>
		</field>
	</fields>

</metadata>

Note two important information:

  • the request group that indicates mandatory fields
  • the array parameter that indicates that these parameters will be added in the request URL

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

site/models/helloworld.php

<?php
// No direct access to this file
defined('_JEXEC') or die('Restricted access');
// import Joomla modelitem library
jimport('joomla.application.component.modelitem');
// 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!';
			break;
			default:
			case 1:
				$this->msg = 'Hello World!';
			break;
			}
		}
		return $this->msg;
	}
}

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

helloworld.xml

<?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>
	<authorEmail>john.doe@example.org</authorEmail>
	<authorUrl>http://www.example.org</authorUrl>
	<copyright>Copyright Info</copyright>
	<license>License Info</license>
	<version>0.0.5</version>
	<description>Description of the Hello World component ...</description>

	<files folder="site">
		<filename>index.html</filename>
		<filename>helloworld.php</filename>
		<filename>controller.php</filename>
		<folder>views</folder>
		<folder>models</folder>
	</files>

	<administration>
		<menu>Hello World!</menu>
		<files folder="admin">
			<filename>index.html</filename>
			<filename>helloworld.php</filename>
		</files>		
	</administration>
</extension>

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.

Contributors[edit]