Ticket #19189: 19189.addEventListener.2.diff

wp-includes/js/autosave.dev.js

@@ -48 +48 @@
                 }
         };
 
-        $(window).unload( function() {
+        var unloadHandler = function() {
                 if ( ! autosaveLockRelease )
                         return;
                 $.ajax({
@@ -62 +62 @@
                                 active_post_lock: $('#active_post_lock').val()
                         }
                 });
-        } );
+        };
 
+        if ( window.addEventListener ) {
+                window.addEventListener( 'unload', unloadHandler, false );
+        } else if ( window.attachEvent ) {
+                window.attachEvent( 'onunload', unloadHandler );
+        }
+
         // preview
         $('#post-preview').click(function(){
                 if ( $('#auto_draft').val() == '1' && notSaved ) {