Creating a Joomla Plugin for Specific Modules

gistfile1.txt

class PlgContentContentSpan extends JPlugin
{
	/**
	 * Plugin that converts:
	 * <p>
	 * <img src="/images/EDPS-ABOVE-CONTENT-optimized.jpg" alt="" width="689" height="327">
	 * <img src="/images/JW-ABOVE-CONTENT-optimized.jpg" alt="" width="315" height="327">
	 * </p>
	 *
	 * To:
	 * <span id="contentspan" style="background-image: url(/images/EDPS-ABOVE-CONTENT-optimized.jpg), url(/images/JW-ABOVE-CONTENT-optimized.jpg);"></span>
	 */
	public function onContentPrepare($context, &$row, &$params, $page = 0)
	{
		// if the module is custom HTML
		if ($context == 'mod_custom.content') {

			// make sure the custom HTML is the _contentimages module
			$module = JModuleHelper::getModule('mod_custom');
			$modparams = new JRegistry($module->params);
			if ($modparams['moduleclass_sfx'] == '_contentimages') {
				
				// get the HTML
				$html = $row->text;
				
				// get the image sources
				$dom = new DOMDocument();
				$dom->loadHTML($html);
				$xpath = new DOMXPath($dom);
				$imgs = $xpath->query('//img');
				
				// make the image paths absolute for the background-image url
				$img1 = '/' . $imgs->item(0)->getAttribute('src');
				$img2 = '/' . $imgs->item(1)->getAttribute('src');
				
				// format the HTML
				$stdStyle = 'url(' . $img1 . '), url(' . $img2 . ');';
				$pieStyle = 'url(' . $img1 . ') top left no-repeat, url(' . $img2 . ') top right no-repeat;';
				$contentspan = '<span id="contentspan" style="background-image: ' . $stdStyle . ' -pie-background: ' . $pieStyle . '"></span>';
				
				// return the new HTML
				$row->text = $contentspan;
				return true;
			}
		}
	}
}