nit: s/undefined/null

[dygraphs.git] / tests / zoom.html

diff --git a/tests/zoom.html b/tests/zoom.html
index 353be3b..c3b0e2d 100644 (file)
--- a/tests/zoom.html
+++ b/tests/zoom.html
@@ -84,8 +84,8 @@
 
       function unzoomGraph() {
         g.updateOptions({
-          dateWindow: undefined,
-          valueRange: undefined
+          dateWindow: null,
+          valueRange: null
         });
       }
     </script>