2. Presentation name change me in master Introduction Toby
Patterson Executive Director of GMITC http://www.gmitc.biz
3. Presentation name change me in master Purpose Explain how to
implement your business logic using a custom Joomla! component;
Introduce to the Joomla MVC and other system resources; Demonstrate
some code. The purpose of this presentation is to:
4. Presentation name change me in master Do you need an
extension? How many people ... ? Already have Joomla Websites? Use
Joomla 3PD extensions? Want an extension that doesn't ( yet )
exist? Are developers, have developers, or will hire developers to
create an extension?
5. Presentation name change me in master What is an extension?
A Joomla! Extension ... Implements your business logic, Does not
alter the Joomla core, so that you can easily perform upgrades,
Should ( but does not have to ) use the Joomla Framework.
6. Presentation name change me in master Why Write an Extension
You may wish to write an extension if you have specific business
logic that an existing extension does not perform or does not
perform the task as you need.
7. Presentation name change me in master Examples of Extension
Tasks Displaying customer information. Placing an order Entering
information about a person Checking the status of an application
Changing a client's request Sending a notification many more ... (
this is where I ask for suggestions )
8. Presentation name change me in master Extensions in the
Joomla Framework Components - Interactive screens representing
business logic. Modules - Displayed in specific areas of a
template. Plugins - Extend the Joomla Framework. It is easy to
implement business logic using custom extensions.
9. Presentation name change me in master Joomla 1.5's MVC
Model-View-Controller Software Design Pattern Business,
presentation, and control logic are separate You can change one
part without affecting another ( yay ! ) Joomla 1.5 is the first
version of Joomla that uses a MVC design pattern ( double yay !
)
10. Presentation name change me in master What is an MVC Model
- The model is the part of the component that encapsulates the
applications data and business logic it does the work. View - The
view is the part of the component that is used to render the data
from the model using a layout file it creates the interface.
Controller - The controller will determine what request has been
made by the user and respond appropriately using the model and view
it controls who does what and when.
11. Presentation name change me in master Just Remember Just
remember: Components implement custom business logic rules. You may
need to write your own component to express business logic specific
to you. Joomla 1.5 provides an MVC to help you write a
component.
12. Presentation name change me in master Implementing the
Simplest Component 1. Create the directory
JOOMLA/components/com_hello/ 2. Create the file
JOOMLA/components/com_hello/hello.php 3. Add the following code to
the file 4. Execute the following SQL query insert into
jos_components values ( NULL, 'Hello', '', 0, 0, '', '',
'com_hello', 0, '', 0, '', 1 ); 5. Access the page using the
following URL index.php?option=com_hello
13. Presentation name change me in master New to the MVC? The
Joomla Dev Website offers a sample hello component that you can
experiment with.
14. Presentation name change me in master File System Layout
hello.php base controller.php Controller models/hello.php Model
view.html.php View default.php Layout File Files that you will see
in the hello tutorial once installed.
http://dev.joomla.org/component/option,com_jd-wiki/Itemid,/id,tutorials:components/
15. Presentation name change me in master Typical Flow of
Execution Controller View Model Layout Determine what the user
wants to do. Prepare the response. Perform the business logic.
Display the results.
16. Presentation name change me in master What Does a Model
Look Like Class that extends Joomla's JModel Your method
representing business logic model.php
17. Presentation name change me in master View from the
Frontend index.php?option=com_hello
18. Presentation name change me in master Modification to the
View Add code to fetch a specific greeting. hello.php
19. Presentation name change me in master View from the
Frontend 2 index.php?option=com_hello&id=2 Our presentation
logic has not changed.
20. Presentation name change me in master Quick Review So far
we've learned that: A component typically consists of a model,
view, and controller; A component should, but does not have to, use
the MVC; and Joomla offers an API for many common resources, such
as the database and request variables.
21. Presentation name change me in master Displaying Data We
still need to display the data. That is where the views and the
layout files come in. Generally speaking, models are accessed from
the view class, not the layout files, but either style works.
22. Presentation name change me in master Accessing the
Business Logic The method getGreeting() is called from the view
class. view.html.php
23. Presentation name change me in master Modifying the
Presentation Logic The view contains the logic for displaying the
data.
24. Presentation name change me in master Layout Files Layout
files are used to display the data. Your template files should be
the few that contain HTML. nogreeting.php default.php
25. Presentation name change me in master Quick Review Now we
know that: Models represent business logic; Views represent
presentation logic; Layouts are for markup language.
26. Presentation name change me in master Controller tasks You
may not need to customize your controller because Joomla provides
most of the control logic for you. However you can define your own
methods if you want. You may want to throw an error if the use is
not logged in.
27. Presentation name change me in master Customizing the
Controller controller.php
28. Presentation name change me in master Using Controller
Methods index.php?option=com_hello&task=showGreeting
29. Presentation name change me in master Abstract Programming
Interface Important APIs that we've seen. MVC - JController,
JModel, JView Language - JText Input - JRequest User - JUser
30. Presentation name change me in master Other Factory
Resources JFactory - Source for global objects JApplication - The
current application JMail - Mailer object JSession - Information
about the current session
31. Presentation name change me in master Conclusion The
important concepts to take away are: Controllers represent control
logic; Models represent business logic; Views represent
presentation logic; Layouts are for markup language. Joomla 1.5
provides new facilities for you to easily represent your business
logic using a custom component.
