Difference between revisions of "Creating a basic Joomla! template"
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== Introduction ==
== Introduction ==
Revision as of 21:42, 17 September 2012
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- 1 Introduction
- 2 Setting up a directory structure
- 3 Creating a basic templateDetails.xml file
- 4 Creating a basic index.php file
- 5 Testing the template
- 6 Packaging the template for installation
- 7 Conclusion
The purpose of this tutorial is to serve as an introduction to creating Joomla! templates. It will cover the essential files and code needed to create a basic template. The code is presented so it can be cut and pasted with very little modification needed.
Setting up a directory structure
To make the most basic template, create a new folder in the templates folder. Name this folder after your template i.e. mynewtemplate.
Using a text editor create the files index.php and templateDetails.xml.
To keep things organized, make 2 new folders called images and css. Inside the css folder create a file called template.css.
Although it is fine to place all your CSS code directly in your index.php file to start, many web developers prefer to place their CSS code in a separate file that can be linked from multiple pages using the
link tag. This may also shorten the loading time of your pages, since the separate file can be cached.
This is the most basic practical setup.
Outline of folder and file structure:
Creating a basic templateDetails.xml file
The templateDetails.xml file is essential. Without it, your template won't be seen by Joomla!. The file holds key metadata about the template.
The syntax of the file is different for each Joomla version.
<?xml version="1.0" encoding="utf-8"?> <extension version="2.5" type="template"> <name>mynewtemplate</name> <creationDate>2008-05-01</creationDate> <author>John Doe</author> <authorEmail>firstname.lastname@example.org</authorEmail> <authorUrl>http://www.example.com</authorUrl> <copyright>John Doe 2008</copyright> <license>GNU/GPL</license> <version>1.0.2</version> <description>My New Template</description> <files> <filename>index.php</filename> <filename>templateDetails.xml</filename> <folder>images</folder> <folder>css</folder> </files> <positions> <position>breadcrumb</position> <position>left</position> <position>right</position> <position>top</position> <position>user1</position> <position>user2</position> <position>user3</position> <position>user4</position> <position>footer</position> </positions> </extension>
<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE install PUBLIC "-//Joomla! 1.5//DTD template 1.0//EN" "http://www.joomla.org/xml/dtd/1.5/template-install.dtd"> <install version="1.5" type="template"> <name>mynewtemplate</name> <creationDate>2008-05-01</creationDate> <author>John Doe</author> <authorEmail>email@example.com</authorEmail> <authorUrl>http://www.example.com</authorUrl> <copyright>John Doe 2008</copyright> <license>GNU/GPL</license> <version>1.0.2</version> <description>My New Template</description> <files> <filename>index.php</filename> <filename>templateDetails.xml</filename> <folder>images</folder> <folder>css</folder> </files> <positions> <position>breadcrumb</position> <position>left</position> <position>right</position> <position>top</position> <position>user1</position> <position>user2</position> <position>user3</position> <position>user4</position> <position>footer</position> </positions> </install>
So, as you can see, we have a set of information between markup tags (the
<element>s). Your best approach is to cut and paste this into your templateDetails.xml file and change the relevant bits (such as
<files> part should contain all the files that you use - you possibly don't know what they are called yet - don't worry, update it later. The
<folder> element can be used to define an entire folder at once.
Leave the positions as they are - these are a common set so you will be able to switch easily from the standard templates.
Creating a basic index.php file
index.php file becomes the core of every page that Joomla! delivers. Essentially, you make a page (like any HTML page) but place PHP code where the content of your site should go. The template works by adding Joomla code into module positions and the component section in your template. Anything added to the template will appear on all pages unless it is added to one of these sections via the Joomla CMS (or customised code).
This page will show the bare-bones code ready for you to cut and paste into your own design.
A Joomla template begins with the following lines:
<?php defined( '_JEXEC' ) or die( 'Restricted access' );?> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="<?php echo $this->language; ?>" lang="<?php echo $this->language; ?>" >
The first line stops naughty people looking at your coding and getting up to bad things.
The second line is the Document Type Declaration (DOCTYPE), which tells the browser (and web crawlers) which flavor of HTML the page is using. The doctype used above is HTML5, a newer version of HTML that is largely backwards compatible, but contains many new features. You should be aware that this will not work well in Internet Explorer 8 or earlier without a hack. You might want to investigate this situation and your clients' wishes before deciding on which doctype you want to use. However this is used in Joomla and higher.
The third line begins our HTML document and describes what language the website is in. A html document is divided into two parts, head and body. The head will contain the information about the document and the body will contain the website code which controls the layout.
<head> <jdoc:include type="head" /> <link rel="stylesheet" href="<?php echo $this->baseurl ?>/templates/system/css/system.css" type="text/css" /> <link rel="stylesheet" href="<?php echo $this->baseurl ?>/templates/system/css/general.css" type="text/css" /> <link rel="stylesheet" href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template; ?>/css/template.css" type="text/css" /> </head>
template.css and is located in the
css folder of your template directory. So if your template is in http://www.mysite.com/templates/my_template/ then the css files will go in http://www.mysite.com/templates/my_template/css/).
<body> <jdoc:include type="modules" name="top" /> <jdoc:include type="component" /> <jdoc:include type="modules" name="bottom" /> </body>
Amazingly, this will suffice! Yes, it's a very basic layout, but it will do the job. Everything else will be done by Joomla!. These lines, usually called jdoc statements, tell Joomla to include output from certain parts of the Joomla system. Note: you will need to ensure your menu is set to go into the "top" module position.
Above, the line which says
name="top" adds a module position called top and allows Joomla to place modules into this section of the template. The
type="component" line contains all articles and main content (actually, the component) and is very important. It goes in the centre of the template.
Note: You can add your own module lines anywhere you want in the body, but you have to add a corresponding line to the templateDetails.xml file which sits alongside the index.php of your template.
Finish it off - one last bit:
If you want to add any images to the template you can do so like this:
<img src="<?php echo $this->baseurl; ?>/templates/<?php echo $this->template; ?>/images/myimage.png" alt="Custom image" class="customImage" />
Here the template variable will fill in the name of your template.
You can add custom css like this:
<link rel="stylesheet" href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template;?>/css/styles.css" type="text/css" />
Every file which is added must have a line in the templateDetails.xml file for the template, unless it resides in a sub-folder (which can be included in a <folder> element).Basic template index file
Testing the template
HINT: there are a couple of ways you can preview your index page as you put it together, either insert the styles into the head of the index page or directly link it to the style sheet you will be using temporarily. You can remove these links before packaging the file.
Packaging the template for installation
A directory with several loose files is not a convenient package for distribution. So the final step is to make a package. This is a compressed archive containing the directory structure and all the files. The package can be in ZIP format (with a .zip extension), in TAR-gzip format (with a .tar.gz extension), or in TAR-bz2 format (with a .tar.bz2 extension).
If your template is in a directory mytemplate/ then to make the package you can connect to that directory and use commands like:
- tar cvvzf ../mytemplate.tar.gz *
- zip -r ..\mytemplate.zip *.*
Note to Mac OS X users
Note to template developers using Mac OS X systems: the Finder's "compress" menu item produces a usable ZIP format package, but with one catch. It stores the files in AppleDouble format, adding extra files with names beginning with "._". Thus it adds a file named "._templateDetails.xml, which Joomla 1.5.x can sometimes misinterpret. The symptom is an error message, "XML Parsing Error at 1:1. Error 4: Empty document". The workaround is to compress from the command line, and set a shell environment variable "COPYFILE_DISABLE" to "true" before using "compress" or "tar". See the AppleDouble article for more information.
To set an environment variable on a Mac, open a terminal window and type:
Then in the same terminal window, change directories into where your template files reside and issue the zip command. For instance, if your template files have been built in a folder in your personal directory called myTemplate, then you would do the following:
cd myTemplate zip -r myTemplate.zip *
You should now have created a template that works. It won't look like much yet. The best thing to do now is start experimenting with the layout.