To open a modal box in Joomla using Javascript, first make sure the modal behavior is loaded:

JHTML::_('behavior.modal');

Then, open an external resource with an iframe handler:

SqueezeBox.setContent( 'iframe', 'http://google.com' );

The Joomla frameworks offers an easy solution to insert a date field with a pop-up calender select box, to easily select a date. The pop-up is Mootools operated.

In Joomla 1.7 (and I assume Joomla 1.6) you can very easily execute content plugins on a string.

$text = JHTML::_('content.prepare', $text );

This is much simpler than the previous method in Joomla 1.5:

$Item = JTable::getInstance('content');
$dispatcher = JDispatcher::getInstance();
$params = new JParameter('');
JPluginHelper::importPlugin('content');
$Item->parameters = new JParameter('');
$Item->id = "";
$Item->state = "";
$Item->catid = "";
$Item->sectionid "";
$Item->title "";
$Item->text = "Your text with {content plugin code}";

// Apply content plugins to custom text
$results = $dispatcher->trigger('onPrepareContent', array (&$Item, &$params, 0));

Flash does not load browser cookies when sending HTTP requests (except in Internet Explorer where persistent cookies are loaded). Any requests from Flash will be processed as a new user agent.

This raised a problem for me when trying to perform an AJAX request from a Flash object which required session data from Joomla. The session data of the user performing the request was not passed.

Obviously, I'm not the first to experience this issue and it is widely discussed elsewhere, but not so much when it comes to Joomla.

The "send to friend" feature in Joomla allows you to recommend pages to your friends by emailing them directly from Joomla. One common cause of the E-mail could not be sent error message is the anti-spam measure enforced by Joomla. If you try to send an email within 20 seconds of opening the page, Joomla will produce this error message.

Joomla! 1.6.0 was vulnerable to SQL Injection. Parameters (filter_order, filer_order_Dir) were not properly sanitized in Joomla!, which lead to the SQL Injection vulnerability. This could allow an attacker to inject or manipulate SQL queries in the back-end database, allowing for the manipulation or disclosure of arbitrary data.

The vulnerability was fixed in Joomla! 1.6.1.