X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=dygraph-utils.js;h=f53c81ea16360486f42429546bfb90955b91b0eb;hb=db775859ec7ae823b731bfb04cb544ef3ae7ad3a;hp=11a2fba2f76861806fde946af6be631083e9d8ca;hpb=745e9e52bf0c9fe1eec18ad64d76787419b033f4;p=dygraphs.git

diff --git a/dygraph-utils.js b/dygraph-utils.js
index 11a2fba..f53c81e 100644
--- a/dygraph-utils.js
+++ b/dygraph-utils.js
@@ -1246,10 +1246,11 @@ Dygraph.isElementContainedBy = function(containee, container) {
   if (container === null || containee === null) {
     return false;
   }
-  while (containee && containee !== container) {
-    containee = containee.parentNode;
+  var containeeNode = /** @type {Node} */ (containee);
+  while (containeeNode && containeeNode !== container) {
+    containeeNode = containeeNode.parentNode;
   }
-  return (containee === container);
+  return (containeeNode === container);
 };