javascript - Customising Joomla category blog -

i change link of article within category blog. articles within sub category have links href="#" , apply class them. whilst parent category, or sub category link article normal. php , javascript beginner, have tried:

<?php $catid = jrequest::getint('catid'); if ($catid == 11) : ?><?php echo jlayouthelper::render('joomla.content.readmore', array('item' => $this->item, 'params' => $params, 'link' => $link)); ?><?php endif; ?> 

around readmore call in blog_item.php file. result none of items displayed readmore button, ones within relevant category.