Hmmm, well I am not sure that MetaMod is the right way to achieve this (generally CSS manipulation is done in the template, or via setting a CSS Class Suffix on particular components or modules), but since you asked... it's easy to achieve.

First, create some CSS rules and put them into a string variable:

$css = 'body { font-size:100%; }
a {font-weight:bold;}
div.spacer {margin:1em;}
';

Then, as part of your rule, you can tell Joomla to include this CSS in the header. This places the CSS directly into the page rather than linking to a file. You could do that too, but for a few basic CSS rules it' more efficient to put them straight into the header like this:

$doc = & JFactory::getDocument();
$doc->addStyleDeclaration($css);

So to put all this into a rule, do the following:

if ( $option == 'com_content' and (int)$id == 50 ) { /*arbitrary rule */

  $css = 'body { font-size:100%; }

   a {font-weight:bold;}

   div.spacer {margin:1em;}

  ';

  $doc = & JFactory::getDocument();

  $doc->addStyleDeclaration($css);

}

Hope that helps,
Stephen

Thank You!  Works as a charm! I have a page with three categories and for all articles in each category only the headers have a specific color. I used this code to make it work:

// color for category #1 (lime)



if ($option == 'com_content' 

and $view == 'article'

and JRequest::getVar('catid') == '1' ) {

 

  $css = '.contentheading, h1, h2, h3  { 

  color: #9c0 !important; }';



  $doc = & JFactory::getDocument();

  $doc->addStyleDeclaration($css);



}

Nice way of using MetaMod!