The only place where I know that the Item Parameters Link and Link Text is the RSGallery2 Single Image Display plugin (
http://joomlacode.org/gf/project/rsgallery2/frs/?action=FrsReleaseBrowse&frs_package_id=2994, latest version for Joomla 1.5 is plg_rsg2_singledisplay_2.1_J15). That plugin has a Parameter in its Plugin Parameters: Popup Style where with the option "Use Link and Link Text" (value: use_link) use the Item Parameters you mention. I don't know of any other templates that use these parameters, but I did not want to remove them in case anyone uses it for custom templates, or the single display plugin.
Check the rsgallery2_singledisplay.php file in that plugin on how the Link and Link Text parameters are implemented (I started from line 229: case "use_link" and went back and forth).
So the question becomes how one can use the parameters in a template. I'm using the rsgallery2_singledisplay.php file as an example how these item parameters are obtainted where $image_object is an rsgItem_image object.
$params_obj = $image_object->parameters(); //line 132
$params_obj->get( 'link', '' ) //line 157
Let's take the file /components/com_rsgallery2/templates/sementic/html/item_image.php where $this is an rsgDisplay_semantic object. This rsgDisplay_semantic object holds an rsgItem_image object (which is the $params_obj in the rsgallery2_singeldisplay.php file), and in line 4 in the file mentioned
$item = $this->currentItem;
$item now holds this rsgItem_image object. Now when you add
$params_obj = $item->parameters();
you get all the parameters and with
$link_text = $params_obj->get( 'link_text','' );
$link = $params_obj->get( 'link', '' );
you get the two parameters you want (parameters link_text and link both have here an empty string as default value when there is no value).
By the way, I use J!Dump, extensions.joomla.org/extensions/miscellaneous/development/1509, to find out what kind of "thing" $this is...
Let's add such a Link with Link Text to the item view like this one:
http://demo.rsgallery2.nl/demo-rsgallery2/3-a-subgallery/23-1545499.html. For that the start of the file /components/com_rsgallery2/templates/sementic/html/item_image.php becomes
<?php
defined('_JEXEC') or die('Restricted access');
$item = $this->currentItem;
$watermark = $rsgConfig->get('watermark');
$imageOriginalUrl = $watermark ? waterMarker::showMarkedImage( $item->name, 'original' ) : imgUtils::getImgOriginal( $item->name );
$imageUrl = $watermark ? waterMarker::showMarkedImage( $item->name ) :
imgUtils::getImgDisplay( $item->name );
//Get parameters of item object (e.g. Link and Link Text)
$params_obj = $item->parameters();
//Get the specific link_text and link parameters
$link_text = $params_obj->get( 'link_text','' );
$link = $params_obj->get( 'link', '' );
//Do something with these parameters
$output = '<a href="' . $link . '">';
$output .= $params_obj->get( 'link_text','' );
$output .= '</a>';
echo $output;
switch ($rsgConfig->get('displayPopup')) {
//No popup
With the added code a link is added next to the image (make sure you have entered Link and Link Text for the image you're viewing!).
I hope this is enough info to get you started to implement a link where you want it... I used RSGallery2 2.2.1 for this (it has several bug fixes over 2.00.0 which is quite old).
Perhaps this link,
http://www.rsgallery2.nl/display_and_templates/how_create_your_own_template_or_modify_semantic_template_16758.0.html, helps you as well to create your own template based on the Semantic template.
