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Summer Internship 2013
01 - Joomdle Development
Week 02 – Report 01 - <26/05/2013>
ZEEL SHAH
This week I was assigned to understand Joomla platform and also give some demos by developing some
plugins/component and create a prototype of MOOC in Joomla. So to understand joomla plugin I am
sharing this tutorial with you.
How to create a Hello World content plugin for Joomla
3.0
Written by Zeel Shah
This plugin will print "Hello World!" at the beginning of every article. This plugin is of group ‘content’ as we
are dealing with articles.
Step 1: Create the Plugin Files
All Joomla 2.5 plugins contain a xml file. These xml files contain information such as who wrote the plugin
and when, what files should be included with the plugin, and any plugin settings that can be adjusted. The
first thing you should do is copy the following text and save it as helloworld.xml
<?xml version="1.0" encoding="utf-8"?>
<extension version="3.0" type="plugin" group="content">
<name>plg_content_helloworld</name>
<author>Zeel shah</author>
<creationDate>2012-10-21</creationDate>
<copyright>zps</copyright>
<license>GNU General Public License</license>
<authorEmail>[email protected]</authorEmail>
<authorUrl>www.magnificientzps.blogspot.com</authorUrl>
<version>1.0</version>
<description>Simple Hello World Plugin that prints "Hello World" at the beginn
ing of every article.</description>
<files>
<filename plugin="helloworld">helloworld.php</filename>
<filename>index.html</filename>
</files>
</extension>
After creating the XML file, we now need to create our php file, which does all of the work. The following
code should be saved to helloworld.php
<?php
// no direct access
defined('_JEXEC') or die;
class plgContentHelloworld extends JPlugin
{
public function onContentAfterTitle($context, &$article, &$params, $limitstart)
{
return "<p>Hello World!</p>";
}
}
?>
The last file we need to create is one named index.html. You don't need to place any code in the file, you
simply need to create it.
At this stage, you should have the following files:
•
helloworld.xml
•
helloworld.php
•
index.html
Copy all these files into folder named plg_helloworld and Compress the folder into a zip file
named plg_helloworld.zip
Step 2: Install the Plugin
Step 3: Enable and Test your new Plugin
When you initially install the plugin, it will be disabled, so be sure to enable the plugin.
Because we're using theonContentAfterTitle event, we need to set the article's Show Intro Text value
to Hide:
Visit any Joomla 3.0 article, and you should see "Hello World!" printed after the title, as in the following
screenshot to the right.
Because we used the onContentAfterTitle event, our "Hello World" message is being shown on the
content andafter the title has been printed.