Auto refresh content in Mediawiki - ajax

Question

I added a new tag (<news />) to my mediawiki to list the last modified pages.
Unfortunately the list is not updated unless I modify the page where the tag is.
I'm looking for a way to do it, and I think of AJAX. But I didn't manage to make AJAX refreshing my list.
Does anyone know a simple way to add an auto refresh feature on my Mediawiki ?
Here is my extension code :
$wgHooks['ParserFirstCallInit'][] = 'replaceTags';
function replaceTags( Parser $parser ) {
$parser->setHook( 'news', 'newsRender' );
return true;
}
function newsRender( $input, array $args, Parser $parser, PPFrame $frame ) {
// Titre =News=
$output = $parser->parse( "=News=", $parser->mTitle, $parser->mOptions, false, false )->getText();
$nb = 5;
$querySQL = "SELECT page_namespace, page_title, page_id, page_latest, rev_timestamp
FROM page, revision
WHERE page.page_latest = revision.rev_id
AND page_namespace = 0
ORDER BY rev_timestamp
DESC LIMIT 0,$nb";
$dbr = wfGetDB( DB_SLAVE );
$res = $dbr->query( $querySQL );
$count = $dbr->numRows( $res );
if( $count > 0 ) {
$output .= "<ul>";
while( $row = $dbr->fetchObject( $res ) )
{
$pageTitle = $row->page_title;
$nicerPageTitle = str_replace("_", " ", $pageTitle);
$pageNamespace = $row->page_namespace;
$title = Title::makeTitleSafe( $pageNamespace, $pageTitle );
$url = $title->getFullURL();
$date = $row->rev_timestamp;
$date = wfTimestamp( TS_RFC2822, $date );
$output .= "<li>$nicerPageTitle $date</li>";
}
$output .= "</ul>";
} else {
$output .= "A l'ouest rien de nouveau !!!";
}
return $output;
}

Answer 1

Thanks to nischayn22, I go into the cache problem in depth.
And I found that it's possible to deactivate it :
$parser->disableCache();
I tried it, and it works !!!
http://www.mediawiki.org/wiki/Extensions_FAQ#How_do_I_disable_caching_for_pages_using_my_extension.3F

Answer 2

This probably happens because MediaWiki uses Cache for pages. What you could rather do is make a SpecialPage for the feature needed. AFAIK Special Pages are not cached (confirm this on irc #mediawiki).
Also you might already find a similar implementation done by someone if you search the extensions that exist on Mediawiki.org .(Otherwise I would be happy to build one for you :)
Update: Extensions you could use Dynamic List(used in wikinews) and news . There could be more if you search mediawiki.org.