Joomla 3 Component programmeren met RAD

Joomla 3 Component
programmeren
met RAD
Peter Martin, www.db8.nl. twitter: @pe7er
Joomladagen.nl/2014 – 22+23 maart 2014

Joomladagen 2014Joomladagen 2014
Peter Martin
● Joomla website specialist
Marketing + Communicatie
achtergrond & technische
affiniteit
● Vrijwilliger Joomla:
● Global Moderator
● Community Leadership
Team
● Open Coffee Nijmegen
● Linux User Group Nijmegen
Interesses:
● Open Source Software
● Linux sinds 2007
(Ubuntu → Debian → Arch
Linux → Debian)
● Raspberry Pi
● Muziek (Vinyl)
● Filmhuisfilms
Website: www.db8.nl – e-mail: peter@db8.nl
LinkedIn: http://www.linkedin.com/in/pe7er – Twitter: @pe7er

Overzicht Presentatie
>>> Sheets via: www.db8.nl <<<
a)Introductie
b)Rapid Application Development (RAD)
c)Joomla Component: db8locate
d)Fouten repareren
e)Vragen?
>>> Component via: https://github.com/pe7er/db8locate <<<

a) Introductie
● Eigen webapplicatie: alles zelf programmeren
● PHP/MySQL/HTML/CSS/JavaScript
● Joomla component: Joomla = Framework
● Gegevens in/uit database – Database object
● Layout – Template
● Rechtenbeheer – Access Control List (ACL)
● MVC → template overrides mogelijk
● Plugins laten ingrijpen op eigen component

a) Functionaliteit component back-end
● Lijst van categorieën
● Toon lijst van categorieën
● New / Edit één categorie
● Delete categorie(ën)
● Publish/unpublish
categorie(ën)
● Formulier van één categorie
● Toon formulier van één
categorie
● Save één categorie
● Lijst van items
● Toon lijst van items
● New / Edit één item
● Delete item(s)
● Publish/unpublish item(s)
● Formulier van één item
● Toon formulier van één item
● Save één item

a) Functionaliteit component front-end
● Toon lijst van categorieën
● Toon details één categorie
● Toon lijst van items
● Toom één item

b) Rapid Application Development (RAD)

● Veel voorkomende functionaliteit code abstraheren
● Conventies
● Don’t Repeat Yourself (DRY)
● Nooku Framework ('Koowa') – Johan Janssens
● Joomlatools extensies (DOCman), Anahita
● Framework on Framework – Nicholas Dionysopoulos
● Basis van Akeeba Backup, Admin Tools etc
b) Software Development Framework

Rapid Application Development (RAD)
● RAD = Framework on Framework (sinds Joomla 3.2)
● Niet stand-alone maar uitbreiding van Joomla! Platform
Gebruikt Joomla's MVC classes (uitbreidingen) & lijkt op
Joomla's MVC API
● Backwards compatibile
● Minder code → sneller ontwikkelen & minder bugs
● Convention over configuration -> FOF conventies mbt
naamgeving van functies / veldnamen in tabellen ->
automatisch functionaliteit
● Bootstrap, jQuery, JSON
● Hierarchical MVC (HMCV) - toon component views op
andere plaatsen (andere views, componenten, modules)

1. basis component (back-end)
1.Entry point
/administrator/components/com_db8locate/db8locate.php
2.Dispatcher
/administrator/components/com_db8locate/fof.xml
3.SQL definitie van database tabel(len)
/administrator/components/com_db8locate/sql/install/mysql/install.sql
4.XML installatie manifest
/administrator/components/com_db8locate/db8locate.xml
5.View: lijst
/administrator/components/com_db8locate/views/items/tmpl/form.default.xml
6.View: formulier
/administrator/components/com_db8locate/views/item/tmpl/form.form.xml
7.Taalbestanden
/administrator/components/com_db8locate/language/en-GB/
en-GB.com_db8locate.sys.ini + en-GB.com_db8locate.ini

c) Joomla Component met RAD

c) Joomla Component met RAD
● Werkomgeving
● Lokale webomgeving (LAMP/XAMP/MAMP) +
phpMyAdmin
● Joomla 3.2.x installatie
● Git (software versie beheer) + github.com
● IDE voor PHP (Netbeans/Eclipse/”weapon of choice”)

“db8 locate” component
Doel: Locaties beheren en op Google Map tonen
● Naam: “db8 Locate”
● Componentnaam: com_db8locate
● Database tabelnaam: #__db8locate_items

1.Entry point
2.Dispatcher
/administrator/components/com_db8locate/fof.xml
3.SQL definitie van database tabel(len)
4.XML installatie manifest
5.View: lijst
6.View: formulier

1.1 basis component – entry point
<?php
defined('_JEXEC') or die();
// Load FOF
include_once JPATH_LIBRARIES.'/fof/include.php';
// Quit if FOF is not installed
if(!defined('FOF_INCLUDED')) {
JError::raiseError ('500', 'FOF is not installed');
}
FOFDispatcher::getTmpInstance('com_db8locate')->dispatch();

1.2 basis component – fof
dispatcher/administrator/components/com_db8locate/fof.xml
●<?xml version="1.0" encoding="UTF-8"?>
●<fof>
● <backend>
● <dispatcher>
● <option name="default_view">items</option>
</dispatcher>
● </backend>
●</fof>

1.3 basis component – SQL definitie
● Maak SQL installatie bestand:
/administrator/components/com_db8locate/
sql/install/mysql/install.sql
install.sql bevat:
● CREATE TABLE, tabelnaam in meervoud:
#__db8locate_items
● ID field, veldnaam in enkelvoud:
componentnaam_enkelvoud-view_id:
db8locate_item_id (in Joomla: “id”)
● title
● PRIMARY KEY (`db8locate_item_id`) = ID field

1.3 basis component – SQL definitie
/
administrator/components/com_db8locate/sql/install/mysql/install.sql
CREATE TABLE IF NOT EXISTS `#__db8locate_items` (
● `db8locate_item_id` bigint(20) UNSIGNED NOT NULL AUTO_INCREMENT,
● `title` varchar(255) NOT NULL,
● PRIMARY KEY (`db8locate_item_id`)
●) DEFAULT CHARSET=utf8;

1.4 basis component – XML manifest
1/2
<?xml version="1.0" encoding="utf-8"?>
<extension version="3.2" type="component" method="upgrade">
<name>db8 locate</name>
<author>Peter Martin</author>
<creationDate>23 March 2014</creationDate>
<copyright>Copyright (C) 2014 Peter Martin / db8.nl</copyright>
<license>GNU General Public License version 2</license>
<authorEmail>joomla@db8.nl</authorEmail>
<version>1.0.1</version>
<description>Component to manage and display locations on a Google Map</description>

<install>
● <sql>
● <file driver="mysql" charset="utf8">sql/install/mysql/install.sql</file>
● <file driver="mysql">sql/install/mysql/install.sql</file>
●
● <file driver="mysqli" charset="utf8">sql/install/mysql/install.sql</file>
● <file driver="mysqli">sql/install/mysql/install.sql</file>
● </sql>
● </install>

1.4 basis component – XML manifest
2/2

<administration>

<menu view="cpanel">COM_DB8LOCATE</menu>

<files folder="backend">
<folder>sql</folder>
<filename>db8locate.php</filename>
<filename>fof.xml</filename>
</files>
</administration>
</extension>

1.5 basis component – view lijst
<?xml version="1.0" encoding="UTF-8"?>
●
●<form type="browse"
● show_header="1"
● show_filters="1"
● show_pagination="1"
● norows_placeholder="COM_DB8LOCATE_COMMON_NORECORDS">
●
● <headerset>
● <header name="db8locate_item_id" type="rowselect" tdwidth="20" />
● <header name="title" type="fieldsearchable" sortable="true"
buttons="yes" buttonclass="btn" />
● </headerset>
●
● <fieldset name="items">
● <field name="db8locate_item_id" show_id="true" type="selectrow"/>
● <field name="title" type="text" show_link="true" url="index.php?option=com_db8locate
&view=item&id=[ITEM:ID]" empty_replacement="(no title)" />
● </fieldset>
●
●</form>

1.6 basis component – view formulier
●
●<form validate="true" serverside_validate="true">
●
● <fieldset name="basic_configuration"
● label="COM_DB8LOCATE_LOCATION_ITEM_EDIT"
●
description="COM_DB8LOCATE_LOCATION_ITEM_EDIT_BASIC_DESC"
● class="span4">
●
● <field name="title" type="text"
● class="inputbox"
● label="JGLOBAL_TITLE"
● required="true"
● Size="50" />
● </fieldset>
●</form>

1. basis component – installatie
Via Extensions > Extension Manager > Discover

● Lijst weergave

● Formulier weergave

● Lijstweergave na paar keer new & save

2. taalbestand

2. taalbestand
sys.ini → kort systeem taalbestand voor gebruik door Joomla
Plaats in /language/ map van db8locate component!
language/en-GB/en-GB.com_db8locate.sys.ini
●
COM_DB8LOCATE="db8 Locate"
COM_DB8LOCATE_XML_DESCRIPTION="Component to
manage and display locations on a Google Map"

2. taalbestand
.ini → taalbestand voor gebruik in com_db8locate
Plaats in /language/ map in component!
language/en-GB/en-GB.com_db8locate.ini
TIP: “Debug Language” & verzamel “vertaal labels”
COM_DB8LOCATE="db8 Locate"
COM_DB8LOCATE_TITLE_ITEMS="Location Items"
COM_DB8LOCATE_COMMON_NORECORDS="No Location Items"
COM_DB8LOCATE_TITLE_ITEMS_EDIT="Edit Location Items"
COM_DB8LOCATE_LOCATION_ITEM_EDIT="Location Items"
COM_DB8LOCATE_LBL_ITEM_SAVED="Location Item saved"
COM_DB8LOCATE_CONFIRM_DELETE="Delete Location Item?"

3. aan/uitzetten

3. aan/uitzetten – database veld
Veld “enabled” aan databasetabel toevoegen om
publicatiestatus op te slaan.
ALTER TABLE `#__db8locate_items` ADD `enabled`
TINYINT( 3 ) NOT NULL DEFAULT '1';

3. aan/uitzetten – lijst
Aan <headerset> toevoegen:
●
<header name="enabled" type="published" sortable="true"
tdwidth="8%" />
●
●Aan <fieldset name="items"> toevoegen:
● <field name="enabled" type="published"/>
●

3. aan/uitzetten – formulier
Aan <fieldset> toevoegen:
●
<field name="enabled" type="list" label="JSTATUS"
● labelclass="todo-label"
● filter="intval" size="1" default="1" >
● <option value="1">JPUBLISHED</option>
● <option value="0">JUNPUBLISHED</option>
●</field>
●

3. aan/uitzetten – formulier

4. volgorde

4. volgorde – database veld
Veld “ordering” aan databasetabel toevoegen om volgorde op te
slaan.
ALTER TABLE `#__db8locate_items` ADD `ordering`
INT( 11 ) NOT NULL DEFAULT '0';

4. volgorde – lijst
●
<header name="ordering" type="ordering"
sortable="true" tdwidth="10%" />
●
●
<field name="ordering" type="ordering" labelclass="order"/>
●
●

5. categorieën

5. categorieën – database veld
Veld “catid” aan databasetabel toevoegen om category_id op te
slaan.
ALTER TABLE `#__db8locate_items` ADD `catid` INT( 10 )
UNSIGNED NOT NULL DEFAULT '0';

5. categorieën – lijst
NB: xml bestand bevat hardcoded SQL voor MySQL → moet eigenlijk
model
●
<header name="category" type="category"
●
<field name="catid" type="sql" translate="false"
query="SELECT * FROM #__categories"
key_field="id" value_field="title" />
●

5. categorieën – lijst

5. categorieën – formulier
●
<field name="catid" type="category"
● extension="com_db8locate"
● label="JCATEGORY"
● required="true"
● size="1" />
●

5. categorieën – formulier

5. categorieën – toolbar
/administrator/components/com_db8locate/toolbar.php
●<?php
defined('_JEXEC') or die();
class Db8locateToolbar extends FOFToolbar {
public function Db8locateHelperRenderSubmenu($vName) {
return $this->renderSubmenu($vName);
}
public function renderSubmenu($vName = null) {
if (is_null($vName)) {
$vName = $this->input->getCmd('view', 'cpanel');
}
$this->input->set('view', $vName);
parent::renderSubmenu();
$toolbar = FOFToolbar::getAnInstance($this->input->getCmd('option',
'com_db8locate'), $this->config);
$toolbar->appendLink(Jtext::_('COM_DB8LOCATE_SUBMENU_CATEGORIES'),
'index.php?option=com_categories&extension=com_db8locate', $vName == 'categories');
}
}

5. categorieën – toolbar

5. categorieën – toolbar in Category
ManagerIn Category Manager voor jouw component, knoppen om terug naar
Items van component te gaan:
/administrator/components/com_db8locate/helpers/db8locate.php
●<?php
●defined('_JEXEC') or die();
●
●/**
● * Helper to display db8 locate component submenus in com_categories
● */
●abstract class Db8locateHelper {
●
● public static function addSubmenu($submenu) {
JsubMenuHelper::addEntry(JText::_(
'COM_DB8LOCATE_TITLE_ITEMS'),
'index.php?option=com_db8locate', $submenu == 'locations');
JsubMenuHelper::addEntry(JText::_(
'COM_DB8LOCATE_SUBMENU_CATEGORIES'),
'index.php?option=com_categories&view=categories
&extension=com_db8locate', $submenu == 'categories');
● }
●}

5. categorieën – Category Manager
Klik op “Location Categories”, Resultaat:
Warning: Invalid argument supplied for foreach() in
/var/www/rad/libraries/cms/helper/content.php on line
121

6. toegangsniveaus
1. Toegang tot applicatie

6. toegangsniveaus applicatie 1/2
/administrator/components/com_db8locate/access.xml
●<?xml version="1.0" encoding="utf-8"?>
●<access component="com_db8locate">
●
●<section name="component">
● <action name="core.admin" title="JACTION_ADMIN"
description="JACTION_ADMIN_COMPONENT_DESC" />
<action name="core.manage" title="JACTION_MANAGE"
description="JACTION_MANAGE_COMPONENT_DESC" />
● <action name="core.create" title="JACTION_CREATE"
description="JACTION_CREATE_COMPONENT_DESC" />
● <action name="core.delete" title="JACTION_DELETE"
description="JACTION_DELETE_COMPONENT_DESC" />
● <action name="core.edit" title="JACTION_EDIT"
description="JACTION_EDIT_COMPONENT_DESC" />
● <action name="core.edit.state" title="JACTION_EDITSTATE"
description="JACTION_EDITSTATE_COMPONENT_DESC" />
● </section>

6. toegangsniveaus applicatie 2/2
/administrator/components/com_db8locate/access.xml
● <section name="category">
● <action name="core.manage" title="JACTION_MANAGE"
description="JACTION_MANAGE_COMPONENT_DESC" />
● <action name="core.create" title="JACTION_CREATE"
description="COM_CATEGORIES_ACCESS_CREATE_DESC" />
● <action name="core.delete" title="JACTION_DELETE"
description="COM_CATEGORIES_ACCESS_DELETE_DESC" />
● <action name="core.edit" title="JACTION_EDIT"
description="COM_CATEGORIES_ACCESS_EDIT_DESC" />
● <action name="core.edit.state" title="JACTION_EDITSTATE"
description="COM_CATEGORIES_
ACCESS_EDITSTATE_DESC" />
● </section>
●
●</access>

6. toegangsniveaus
2. (Front-end) toegang tot
database items

6. toegangsniveaus – lijst

7. parameters

7. parameters
/administrator/components/com_db8locate/config.xml
via Components > db8 locate > categories > [options]
●<?xml version="1.0" encoding="UTF-8"?>
●<config>
●
● <fieldset name="permissions"
● label="JCONFIG_PERMISSIONS_LABEL"
● description="JCONFIG_PERMISSIONS_DESC" >
●
● <field name="rules"
● type="rules"
● label="JCONFIG_PERMISSIONS_LABEL"
● filter="rules"
● component="com_db8locate"
● section="component" />
●
● </fieldset>
●
●</config>

8. meertaligheid

8. meertaligheid – database veld
Veld “language” aan databasetabel toevoegen om taalcode op
te slaan.
ALTER TABLE `#__db8locate_items` ADD `language`
CHAR( 7 ) NOT NULL DEFAULT '*';

8. meertaligheid – lijst
●
<header name="language" type="language"
●
●
<field name="language" type="text" tdwidth="10%" />
●

8. meertaligheid – formulier
●
<field name="language" type="contentlanguage"
label="JFIELD_LANGUAGE_LABEL" >
● <option value="*">JALL</option>
● </field>
●
●

8. meertaligheid – lijst

9. “magic fields”

9. “magic fields”
● Nu in component:
enabled (“state”), ordering,
● Ook nog toevoegen aan database:
created_by, created_on(“created”),
modified_by, modified_on(“modified”),
locked_by(“checked_out”),
locked_on(“checked_out_time”),
hits
● In lijstweergave: created_by & created_on
● In formulierweergave: alle velden

10. tags

10. tags
#__tags tabel:
opslag van tags, bijv:
id title
4 Joomla
5 Linux
#__contentitem_tag_map tabel:
koppeling van content items aan tags
type_alias core_content_id content_item_id tag_id type_id
com_content.article 1 1 2 1
com_weblinks.weblink 2 1 4 2
com_weblinks.weblink 2 1 5 2

10. tags – formulier
●
<field name="tags"
type="tag"
label="JTAG"
description="JTAG_DESC"
class="inputbox span12"
multiple="true" >
</field>

10. tags
Helaas... werkt niet... bug in Joomla t/m versie 3.2.3:
Gebruik van com_tags alleen mogelijk
indien het component JTable gebruikt.

11. eigen velden voor db8locate

11. db8locate – database veld
Eigen voor deze applicatie specifieke velden aan databasetabel
toevoegen om op te slaan.
ALTER TABLE `jos_db8locate_items`
●ADD `location` VARCHAR( 60 ) NOT NULL ,
●ADD `address` VARCHAR( 50 ) NOT NULL ,
●ADD `postcode` VARCHAR( 12 ) NOT NULL ,
●ADD `city` VARCHAR( 50 ) NOT NULL ,
●ADD `region` VARCHAR( 50 ) NOT NULL ,
●ADD `country` VARCHAR( 50 ) NOT NULL ,
●ADD `latitude` VARCHAR( 10 ) NOT NULL ,
●ADD `longitude` VARCHAR( 10 ) NOT NULL ,
●ADD `website` VARCHAR( 100 ) NOT NULL

11. db8locate – lijst

11. db8locate – verdere verbeteringen
● Nieuw SQL installatie script:
● Indien “verplichte velden” niet ingevuld zijn, resulteert “save” in
wissen van nog niet opgeslagen velden...
● Edit formulier wordt te lang → in kolommen indelen

12. front-end

12. front-end – basis component
1.Entry point
/components/com_db8locate/db8locate.php
2.View: lijst
/components/com_db8locate/views/items/tmpl/form.default.xml
/components/com_db8locate/views/items/metadata.xml –> voor menu items
3.View: detailpagina
/components/com_db8locate/views/item/tmpl/form.item.xml
/components/com_db8locate/views/item/metadata.xml –> voor menu items
4.Language files
/components/com_db8locate/language/en-GB/en-GB.com_db8locate.ini

12. front-end – view lijst
/components/com_db8locate/views/items/tmpl/form.default.xml
<form
type="browse"
show_header="1"
show_filters="0"
show_pagination="1"
show_enabled="1"
norows_placeholder="COM_DB8LOCATE_COMMON_NORECORDS" >
<headerset>
<header name="title" type="fieldsearchable" sortable="true"buttons="true" />
<header name="city" type="fieldsearchable" sortable="true"buttons="false" />
<header name="region" sortable="true"buttons="false" />
<header name="country" sortable="true"buttons="false" tdwidth="20%" />
<header name="category" sortable="false"buttons="false" />
</headerset>
<fieldset name="items">
<field name="title" type="text" show_link="true"
url="index.php?option=com_db8locate&view=item&id=[ITEM:ID]"
class="todoitem" empty_replacement="(no title)" />
<field name="city" type="text" />
<field name="region" type="text" />
<field name="country" type="text" />
<field name="catid" type="sql" translate="false" query="SELECT * FROM #__categories"
key_field="id" value_field="title"/>
</fieldset>
</form>

12. front-end – view lijst

12. front-end – view details
/components/com_db8locate/views/item/tmpl/form.item.xml
<?xml version="1.0" encoding="utf-8"?>
●<form
● type="read">
●
● <fieldset name="a_single_item" class="item-container form-horizontal">
● <field name="title" type="text"
● label="COM_DB8LOCATE_TITLE"
● class="db8locate-title-field"
● size="50"/>
●
● <field name="city" type="text"
● label="COM_DB8LOCATE_CITY"
● labelclass="db8locate-field"
● size="20" />
●
● <field name="website" type="text"
● label="COM_DB8LOCATE_WEBSITE"
● labelclass="db8locate-field"
● size="40" />
●
● </fieldset>
●</form>

12. front-end – view details

13. meer views

13. meer views
Combineren van XML & PHP
/components/com_db8locate/views/items/tmpl/default.php
en dan form.default.xml ophalen
Bijv om te mixen met Google Maps
<?php
$viewTemplate = $this->getRenderedForm();
echo $viewTemplate;
?>

13. meer views – mixed php & xml

13. meer views
● Extra (ingebouwde) uitvoermogelijkheden:
&format=csv
administrator/index.php?option=com_db8locate&format=csv
&format=json
administrator/index.php?option=com_db8locate&format=json
● Media files overrides
<form
lessfiles="media://com_db8locate/css/frontend.less||media://com_db8locate/
css/frontend.css

d) hulpmiddelen

Fouten
● Lastiger op te sporen dan bij “gewoon” component!
● Cache!!
● Debuggen
● Bijv back-end error:
“An error has occurred. 1064 You have an error in your SQL syntax; check the manual that corresponds to
your MySQL server version for the right syntax to use near 'ORDER BY node.lft' at line 4 SQL=SELECT
node.id FROM jos_categories AS node, jos_categories AS parent WHERE node.lft BETWEEN parent.lft
AND parent.rgt AND parent.id = ORDER BY node.lft”
kan worden veroorzaakt door fout in front-end!
Test: Front-end com_db8locate tijdelijk even hernoemen
● Front-end error:
Notice: Undefined variable: form_class in /var/www/rad/libraries/fof/render/strapper.php on line 676
Test: .xml files stapsgewijs geheel opnieuw opbouwen
● print_r($object) / echo $query / die(“stop hier”)
● XDebug?

Bronnen
● Documentatie
https://www.akeebabackup.com/documentation/fof.html
● FOF Mailinglist:
https://groups.google.com/forum/#!
forum/frameworkonframework
● Source code Github:
https://github.com/akeeba/fof
● Voorbeelden:
https://github.com/akeeba/todo-fof-example/
https://github.com/akeeba/contactus
Akeeba Backup
Akeeba Ticket System

i e

Vragen?
Presentatie beschikbaar via:
http://www.db8.nl
Component db8locate beschikbaar via:
https://github.com/pe7er/db8locate
Peter Martin
e-mail: info at db8.nl
website: www.db8.nl
twitter: @pe7er

Gebruikte foto's
● Speed Typing - Matthew Bowden http://www.sxc.hu/photo/275499
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● madera en pila 1 - jean froidevaux http://www.sxc.hu/photo/313864
● Books books books... - Brandon Blinkenberg http://www.sxc.hu/photo/424027
● Sign 3: forbidden access - Davide Guglielmo http://www.sxc.hu/photo/200982
● Communications Receiver - John Munsch http://www.sxc.hu/photo/260775
● Flags of the Baltic Sea countries - Johannes Raitio http://www.sxc.hu/photo/471547
● Lock - Robert Linder http://www.sxc.hu/photo/1395379
● Basho Collage 5 - Billy Alexander http://www.sxc.hu/photo/1330749
● Retro/Vintage TV set - "meltingdog" http://www.sxc.hu/photo/1440150
● san sebastian views 1 - ibon san martin http://www.sxc.hu/photo/94018
● Fragile Parcel - Richard Dudley http://www.sxc.hu/photo/1279274
● Sparks - Hector Landaeta http://www.sxc.hu/photo/1184243
● Tools - J Boontje http://www.sxc.hu/photo/805571
● signs signs - Jason Antony http://www.sxc.hu/photo/751034

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