Joomla! How-To's

Something I have run into frequently during module development is the need to allow multiple instances of that module on a single page. Joomla!, of course, handles 99% of the work involved, but there are a few tricky aspects to making this work. One is the need to eliminate styling conflicts, especially in themed modules. If you only use generic classes and then load multiple theme/color stylesheets, the end result can be unpredictable to say the least.

Long-time users of Joomla are quite familiar with content plugins. When you want to take some user-entered text and reformat it into something else, there’s nothing quite as handy as having a content plugin ready to do your bidding.

However, Joomla 1.5 brought some subtle behavior changes. In Joomla 1.0, content plugins act on both articles entered through the Article Manager, as well as HTML entered in user created modules. When a Joomla 1.0 content plugin is recoded for 1.5, the original effect still takes place on content items, but module output is left unchanged.

What happened? Content plugins in Joomla 1.5 are designed to only act on articles managed through the Article Manager. This will seem inconvenient to people used to the old behavior, but there is a good reason for this change. While many content plugins reformat user-entered HTML, others add markup near the article title or just after an article is output. Also, some content plugins are designed to do additional tasks when articles are saved. These actions do not make sense within the context of a module, so content plugins no longer run on them.

While this good in that it enforces consistency, it also poses a problem. Now that content plugins only work on articles, how do you reformat markup coming from modules? Fortunately, there are a couple of workarounds in Joomla 1.5 achieving similar (if not better) results.

"Congressional Web Site Defacements Follow the State of the Union"
- Praetorian Prefect

An interesting problem that we as the US have is our denial of Cyberwar. While this post isn't exactly about that, it's close. Last Wednesday night during or after the President's State of the Union Address, several congressional websites were hacked by Red Eye Crew. Why is this of interest? According to Praetorian Prefect, they were all running Joomla!

Because of it ubiquitous nature, automatic emailing is something that many clients expect. People want to be notified immediately of changes on their sites -- when a new article has been submitted, or a blog comment has been posted. Joomla! already provides some of this functionality out of the box by notifying administrators when a user has registered on their site. You, however, may find yourself needing to implement emailing in your own components. As you may have already guessed, Joomla! provides a very helpful class for this: JMail.

If you've worked with any kind of database-driven web application, you know that HTML forms are the foundation of the user's interaction with the database. Applications use forms to take input from the user and store it or use it to manipulate existing data. Unfortunately, HTML forms can potentially be quite tedious to write. In this article, we will look at a handful of helpful functions that Joomla! provides to save you time preparing your forms.