Develop Basic joomla! MVC component for version 3

Develop Basic Joomla! MVC Component for
version 3.x
Gunjan Patel
Sr. PHP Developer
Joomla! Bug Squad Member
Joomla! SQL Optimisation team coordinator
Google Summer Of Code 2014 Mentor
Joomla! User Network Ahmedabad

My Joomla! Family
gunjan.ce2009@gmail.com @ergunjanpatel

Joomla! User Network Ahmedabad Gunjan Patel @ergunjanpatel
Important Tools
• WebServer, PHP, MySQL - XAMP or WAMP server
• Text Editor or IDE - PhpStorm or SublimeText3
• Web Browser - Firebug and WebDeveloper addons
• Joomla! Coding Standard
• Php Code Sniffer - PHPCS

• jQuery
• BootStrap
• Xdebug
All above are good to know and it
will be a plus point.
Required Skills
Must Know Good to know
• PHP – Minimum 5.3.10 +
• Object Oriented Concepts
• MVC Structure
• HTML
• CSS – Basic
• JavaScript – Entry Level

Joomla! License
• The Joomla software and
default templates are
copyright 2005-2013 Open
Source Matters, Inc.
• You can use, copy, modify
or distribute Joomla!
Under GNU General Public
License.

Security
• Never Trust your User
• Always, sanitize user input
• Use native joomla!
functions to get user
inputs.

Go to Global Configuration
• Set error reporting to
“Development”
• Enable System Debug Mode
• Disable Search Engine Friendly
URLs
Error Reporting Only do this on
development sites

What is Joomla! Component?
• Components are the main functional units of Joomla!
• Let’s say for example: Joomla! is the operating
system and the components are desktop
applications.
• They are usually displayed in the center of the main
content area of a template (depending on the
template).
• Most components have two part:
• Administrator
• Provide configuration of component
• And Backend Activity
• Site
• Used to render pages when being called during normal
site operation.
• com_content and com_contact as an examples.

What is Joomla! Module?
• We can say that modules are “boxes” arranged
around component.
• Usually light weight, flexible
• Modules can be assigned to menu items. So, it
can be our choice on which page we want to
show it.
• Some modules are linked to components: the
“latest news” module, for example, links to the
content component (com_content) and displays
links to the newest content items.
• However, modules do not need to be linked to
components;

What is Joomla! Plugin?
• It provide functions which are associated with
trigger events.
• Joomla provides a set of core plugin events, but
any extension can fire (custom) events.
• When a particular event occurs, all plugin
functions of the type associated with the event
are executed in sequence.
• This is a powerful way of extending the
functionality of the Joomla! Platform.

Joomla! Installation

• Search in Google “developing MVC component in joomla
3” go with the first link.
• In http://docs.joomla.org it is explained really good.
• I will use the same document and will explain you in deep.
• Joomla! Component starts with “com_” prefix in name.
• In URL you can access it using,
http://gunjanpat.el/workshop/administrator/index.php?option=com_helloworld
Let’s start with com_helloworld

Folder Structure
Administrator files
Media files
Frontend Files
Important Files
• admin/helloworld.php
• admin/controller.php
• admin/views/view.html.php
• admin/views/tmpl/default.php
• admin/models/helloworld.php
• admin/controllers/helloworld.php
• site/helloworld.php
• site/controller.php
• site/views/view.html.php
• site/views/tmpl/default.php
• site/models/helloworld.php
Media files are optional, ideally
depends on requirement

Folder Structure after installation
Joomla! User Network Ahmedabad Gunjan Patel 14
Changed to administrator/components/com_helloworld/* From admin/*
Changed to components/com_helloworld/* From site/*`
Changed to media/com_helloworld/* From media/*

Let’s create files step by step… helloworld.xml
File Type: XML Declare Joomla! Extension type

Adding site and admin files
Create site/helloworld.php file and add
Create admin/helloworld.php file and add
Create index.html common to all folders
ZIP it

Adding a view to the site part

Entry point of controller : site/helloworld.php
Stop direct access of file
Static Function
Execute Controller task
Class

Setting the controller: site/controller.php
Component name as a prefix
Extending from parent class

Setting the view
1. Create folder at <yoursite-url>/components/com_[component_name]/views/[name of view]/
2. For helloworld it will look like, yoursite/components/com_helloworld/views/helloworld/
3. Create file at view.[view_mode].php
• view_mode = HTML, XML, CSV, PDF etc…
4. Create folder named tmpl and add default.php file. So, path will be look like,
yoursite/components/com_helloworld/views/helloworld/tmpl/default.php

components/com_helloworld/views/helloworld/view.html.php
default.php
1 2
1. Component Name
2. View Name
Access using Url:
index.php?option=com_helloworld
&view=helloworld
View Name

Update in helloworld.xml
Add new lines
ZIP it

Adding a menu type to the site part

site/views/helloworld/tmpl/default.xml

Adding a model to the site part

Create file site/models/helloworld.php
Model name – same as your view name
Set Display message from model now.

Update site/views/helloworld/view.html.php accordingly…
Get data from Model function now.

Update in helloworld.xml
ZIP it
Add models folder

Adding a variable request in the menu type

Let’s improve XML - site/views/helloworld/tmpl/default.xml
HTML Select List

Let’s improve model - site/models/helloworld.php
Current function

No need to update helloworld.xml
JUST ZIP it

Any Questions so far?

Develop Basic joomla! MVC component for version 3

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