Developing a MVC Component/Adding an install-uninstall-update script file
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Articles in this series[edit]
Articles in this Series
- Introduction
- Developing a Basic Component
- Adding a view to the site part
- Adding a menu type to the site part
- Adding a model to the site part
- Adding a variable request in the menu type
- Using the database
- Basic backend
- Adding language management
- Adding backend actions
- Adding decorations to the backend
- Adding verifications
- Adding categories
- Adding configuration
- Adding ACL
- Adding an install/uninstall/update script file
- Using the language filter facility
- Adding an update server
- Example of a Frontend Update Function
- Example of Menu Parameters & Stylesheets
Introduction[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.
Creating the extension script file[edit]
Installing, updating and uninstalling a component may require additional operations that cannot be achieved by the basic operations described in the main xml file. Joomla 1.6 offers a new approach to solve this problem. It consists in using a php script file containing a class using five methods:
- preflight which is executed before install and update
- install
- update
- uninstall
- postflight which is executed after install and update
Writing an extension script consists in declaring an class whose name is com_ComponentNameInstallerScript with these 5 methods.
script.php
<?php
// No direct access to this file
defined('_JEXEC') or die('Restricted access');
/**
* Script file of HelloWorld component
*/
class com_helloWorldInstallerScript
{
/**
* method to install the component
*
* @return void
*/
function install($parent)
{
// $parent is the class calling this method
$parent->getParent()->setRedirectURL('index.php?option=com_helloworld');
}
/**
* method to uninstall the component
*
* @return void
*/
function uninstall($parent)
{
// $parent is the class calling this method
echo '<p>' . JText::_('COM_HELLOWORLD_UNINSTALL_TEXT') . '</p>';
}
/**
* method to update the component
*
* @return void
*/
function update($parent)
{
// $parent is the class calling this method
echo '<p>' . JText::_('COM_HELLOWORLD_UPDATE_TEXT') . '</p>';
}
/**
* method to run before an install/update/uninstall method
*
* @return void
*/
function preflight($type, $parent)
{
// $parent is the class calling this method
// $type is the type of change (install, update or discover_install)
echo '<p>' . JText::_('COM_HELLOWORLD_PREFLIGHT_' . $type . '_TEXT') . '</p>';
}
/**
* method to run after an install/update/uninstall method
*
* @return void
*/
function postflight($type, $parent)
{
// $parent is the class calling this method
// $type is the type of change (install, update or discover_install)
echo '<p>' . JText::_('COM_HELLOWORLD_POSTFLIGHT_' . $type . '_TEXT') . '</p>';
}
}
This script file will redirect the user to the com_helloworld component when it is installed and will display messages when it is updated or uninstalled.
Adding some language keys[edit]
admin/language/en-GB/en-GB.com_helloworld.sys.ini""
COM_HELLOWORLD="Hello World!"
COM_HELLOWORLD_DESCRIPTION="This is the Hello World description"
COM_HELLOWORLD_HELLOWORLD_VIEW_DEFAULT_DESC="This view displays a selected message"
COM_HELLOWORLD_HELLOWORLD_VIEW_DEFAULT_TITLE="Hello World"
COM_HELLOWORLD_INSTALL_TEXT="HelloWorld Install script"
COM_HELLOWORLD_MENU="Hello World!"
COM_HELLOWORLD_POSTFLIGHT_DISCOVER_INSTALL_TEXT="HelloWorld postlight discover install script"
COM_HELLOWORLD_POSTFLIGHT_INSTALL_TEXT="HelloWorld postflight install script"
COM_HELLOWORLD_POSTFLIGHT_UNINSTALL_TEXT="HelloWorld postflight uninstall script"
COM_HELLOWORLD_POSTFLIGHT_UPDATE_TEXT="HelloWorld postflight update script"
COM_HELLOWORLD_PREFLIGHT_DISCOVER_INSTALL_TEXT="HelloWorld preflight discover install script"
COM_HELLOWORLD_PREFLIGHT_INSTALL_TEXT="HelloWorld preflight install script"
COM_HELLOWORLD_PREFLIGHT_UNINSTALL_TEXT="HelloWorld preflight uninstall script"
COM_HELLOWORLD_PREFLIGHT_UPDATE_TEXT="HelloWorld preflight update script"
COM_HELLOWORLD_UNINSTALL_TEXT="HelloWorld Uninstall script"
COM_HELLOWORLD_UPDATE_TEXT="HelloWorld Update script"
Packaging the component[edit]
Content of your code directory
- helloworld.xml
- script.php
- site/index.html
- site/helloworld.php
- site/controller.php
- site/views/index.html
- site/views/helloworld/index.html
- site/views/helloworld/view.html.php
- site/views/helloworld/tmpl/index.html
- site/views/helloworld/tmpl/default.xml
- site/views/helloworld/tmpl/default.php
- site/models/index.html
- site/models/helloworld.php
- site/language/index.html
- site/language/en-GB/index.html
- site/language/en-GB/en-GB.com_helloworld.ini
- admin/index.html
- admin/access.xml
- admin/config.xml
- admin/helloworld.php
- admin/controller.php
- admin/sql/index.html
- admin/sql/install.mysql.utf8.sql
- admin/sql/uninstall.mysql.utf8.sql
- admin/sql/updates/index.html
- admin/sql/updates/mysql/index.html
- admin/sql/updates/mysql/0.0.1.sql
- admin/sql/updates/mysql/0.0.6.sql
- admin/sql/updates/mysql/0.0.12.sql
- admin/sql/updates/mysql/0.0.13.sql
- admin/models/index.html
- admin/models/fields/index.html
- admin/models/fields/helloworld.php
- admin/models/forms/index.html
- admin/models/forms/helloworld.xml
- admin/models/forms/helloworld.js
- admin/models/rules/index.html
- admin/models/rules/greeting.php
- admin/models/helloworld.php
- admin/models/helloworlds.php
- admin/views/index.html
- admin/views/helloworlds/index.html
- admin/views/helloworlds/view.html.php
- admin/views/helloworlds/tmpl/index.html
- admin/views/helloworlds/tmpl/default.php
- admin/views/helloworlds/tmpl/default_head.php
- admin/views/helloworlds/tmpl/default_body.php
- admin/views/helloworlds/tmpl/default_foot.php
- admin/views/helloworld/index.html
- admin/views/helloworld/view.html.php
- admin/views/helloworld/submitbutton.js
- admin/views/helloworld/tmpl/index.html
- admin/views/helloworld/tmpl/edit.php
- admin/helpers/index.html
- admin/helpers/helloworld.php
- admin/tables/index.html
- admin/tables/helloworld.php
- admin/language/en-GB/en-GB.com_helloworld.ini
- admin/language/en-GB/en-GB.com_helloworld.sys.ini
- admin/controllers/index.html
- admin/controllers/helloworld.php
- admin/controllers/helloworlds.php
- language/en-GB/en-GB.ini
- media/index.html
- media/images/index.html
- media/images/tux-16x16.png
- media/images/tux-48x48.png
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.
helloworld.xml
<?xml version="1.0" encoding="utf-8"?>
<extension type="component" version="1.6.0" method="upgrade">
<name>COM_HELLOWORLD</name>
<!-- The following elements are optional and free of formatting conttraints -->
<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>
<!-- The version string is recorded in the components table -->
<version>0.0.15</version>
<!-- The description is optional and defaults to the name -->
<description>COM_HELLOWORLD_DESCRIPTION</description>
<!-- Runs on install/uninstall/update; New in 1.6 -->
<scriptfile>script.php</scriptfile>
<install> <!-- Runs on install -->
<sql>
<file driver="mysql" charset="utf8">sql/install.mysql.utf8.sql</file>
</sql>
</install>
<uninstall> <!-- Runs on uninstall -->
<sql>
<file driver="mysql" charset="utf8">sql/uninstall.mysql.utf8.sql</file>
</sql>
</uninstall>
<update> <!-- Runs on update; New in 1.6 -->
<schemas>
<schemapath type="mysql">sql/updates/mysql</schemapath>
</schemas>
</update>
<!-- 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>index.html</filename>
<filename>helloworld.php</filename>
<filename>controller.php</filename>
<folder>views</folder>
<folder>models</folder>
<folder>language</folder>
</files>
<media destination="com_helloworld" folder="media">
<filename>index.html</filename>
<folder>images</folder>
</media>
<administration>
<!-- Administration Menu Section -->
<menu img="../media/com_helloworld/images/tux-16x16.png">COM_HELLOWORLD_MENU</menu>
<!-- Administration 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 /admin/ in the package -->
<files folder="admin">
<!-- Admin Main File Copy Section -->
<filename>index.html</filename>
<filename>config.xml</filename>
<filename>access.xml</filename>
<filename>script.php</filename>
<filename>helloworld.php</filename>
<filename>controller.php</filename>
<!-- SQL files section -->
<folder>sql</folder>
<!-- tables files section -->
<folder>tables</folder>
<!-- models files section -->
<folder>models</folder>
<!-- views files section -->
<folder>views</folder>
<!-- controllers files section -->
<folder>controllers</folder>
<!-- helpers files section -->
<folder>helpers</folder>
</files>
<languages folder="admin">
<language tag="en-GB">language/en-GB/en-GB.com_helloworld.ini</language>
<language tag="en-GB">language/en-GB/en-GB.com_helloworld.sys.ini</language>
</languages>
</administration>
</extension>
[edit]
Prev: Adding ACL Next: Adding an update server
Contributors[edit]
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