From: Dan Vanderkam <dan@dygraphs.com>
Date: Mon, 21 Feb 2011 15:31:23 +0000 (-0500)
Subject: fix issue 124
X-Git-Tag: v1.0.0~584^2
X-Git-Url: https://adrianiainlam.tk/git/?a=commitdiff_plain;h=3aa79d94fcdc80ed513c730c9c1a0bb4bb292d61;p=dygraphs.git

fix issue 124
---

diff --git a/dygraph.js b/dygraph.js
index 4a1cef2..657a405 100644
--- a/dygraph.js
+++ b/dygraph.js
@@ -1401,6 +1401,9 @@ Dygraph.prototype.mouseMove_ = function(event) {
   var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(this.mouseEventElement_);
   var points = this.layout_.points;
 
+  // This prevents JS errors when mousing over the canvas before data loads.
+  if (typeof(points) == 'undefined') return;
+
   var lastx = -1;
   var lasty = -1;