(bug 7169) Use Ajax to watch/unwatch articles. Patch by Dan Li with some modificatio...

[lhc/web/wiklou.git] / includes / AjaxFunctions.php

diff --git a/includes/AjaxFunctions.php b/includes/AjaxFunctions.php
index 9f7a332..3e74a19 100644 (file)
--- a/includes/AjaxFunctions.php
+++ b/includes/AjaxFunctions.php
@@ -129,4 +129,43 @@ function wfSajaxSearch( $term ) {
        return $response;
 }
 
+/**
+ * Called for AJAX watch/unwatch requests.
+ * @param $pageID Integer ID of the page to be watched/unwatched
+ * @param $watch String 'w' to watch, 'u' to unwatch
+ * @return String '<w#>' or '<u#>' on successful watch or unwatch, respectively, or '<err#>' on error (invalid XML in case we want to add HTML sometime)
+ */
+function wfAjaxWatch($pageID, $watch) {
+       if(wfReadOnly())
+               return '<err#>'; // redirect to action=(un)watch, which will display the database lock message
+
+       if(('w' !== $watch && 'u' !== $watch) || !is_numeric($pageID))
+               return '<err#>';
+       $watch = 'w' === $watch;
+       $pageID = intval($pageID);
+
+       $title = Title::newFromID($pageID);
+       if(!$title)
+               return '<err#>';
+       $article = new Article($title);
+       $watching = $title->userIsWatching();
+
+       if($watch) {
+               if(!$watching) {
+                       $dbw =& wfGetDB(DB_MASTER);
+                       $dbw->begin();
+                       $article->doWatch();
+                       $dbw->commit();
+               }
+       } else {
+               if($watching) {
+                       $dbw =& wfGetDB(DB_MASTER);
+                       $dbw->begin();
+                       $article->doUnwatch();
+                       $dbw->commit();
+               }
+       }
+
+       return $watch ? '<w#>' : '<u#>';
+}
 ?>