Context Links

/**
 * ContextLinks 
 * Written By Jesse Rochman
 * January 30, 2008
 *
 * Version 1.0
 *
 * Events: OnWebPagePrerender
 *
 * Paste the following into the Configuration:
 * 		&parents=Comma delimited list of parents for which children need context links;string;110,111 &replace_with=Document field to use for the link;string;pagetitle
 * 		
 * Usage:
 *		Parents should be a comma delimited list of IDs for which children you want context links.
 *		Document field to use for the link would likely be pagetitle, alias, longtitle, description, or menutitle.
 *
 *
 */

$e= & $modx->Event;
switch ($e->name) {
    case "OnWebPagePrerender" : //mo register only for backend
        $parents = explode(',',$parents);
		foreach ($parents as $parent) {
			$children = $modx->getActiveChildren($parent,'menuindex','ASC', $fields= 'id, ' . $replace_with);
			foreach ($children as $child) {
				$context_link = '<a href="' . $modx->makeUrl($child['id']) . '">' . $child[$replace_with] . '</a>';
				$modx->documentOutput = str_replace($child[$replace_with], $context_link, $modx->documentOutput);
			}
		}
		
        break;

    default :
       return; // stop here - this is very important. 
}