index-ajax.php usage

i was wondering how to make an ajax call, I’ve made a snippet with this code

jsInclude = "<script>
var pars = 'q=assets/snippets/MaxiGallerySlideShow/MaxiGallerySlideShow.php';
	new Ajax.PeriodicalUpdater('something', 'index-ajax.php', {asynchronous:true, frequency:5, postBody: pars});
</script>";
$modx->regClientScript($jsInclude);

My question is, can I use $modx-> functions in my php page, I want to use a few DB connections...

Thanks in advance

You need to have your code include() the manager/includes/config.inc.php file, at the least. You can include the manager/includes/document_parser.class.inc.php file too, if you want to use the modx class functions.

include ('manager/includes/config.inc.php');
include ('manager/includes/document_parser.class.inc.php');

$table = $modx->getFullTableName("maxigallery");

echo $table; //THIS ECHO DOESNT DISPLAY ANYTHING

$pictures = $modx->db->select("title, filename, gal_id, id", $table);

for($i=0;$i<@$modx->recordCount($pictures) ;$i++)
{
	   array_push($picturesArray,@$modx->fetchRow($picture));
}

echo sizeof($picturesArray); //ALSO THIS ECHO

The only way to get the $modx object is to include the parser and instantiate a new $modx object, just like the main index.php file does.