From: André Wallat <awallat@users.noreply.github.com>
Date: Thu, 16 Jun 2016 11:20:54 +0000 (+0200)
Subject: Fix tooltip not shown for missing dataset
X-Git-Tag: v2.2.0-rc.1~27^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F2789%2Fhead;p=thirdparty%2FChart.js.git

Fix tooltip not shown for missing dataset

When two datasets are shown and they don't have the same x-coordinates, then the position of the tooltip is not calculated correctly, when using mode 'label' or 'dataset'. This fix checks if the position of every dataset exists, before it is used.
---

diff --git a/src/core/core.tooltip.js b/src/core/core.tooltip.js
index 6eb6b3a55..589d4292b 100755
--- a/src/core/core.tooltip.js
+++ b/src/core/core.tooltip.js
@@ -117,8 +117,10 @@ module.exports = function(Chart) {
 		var x = 0,
 			y = 0;
 		for (i = 0; i < xPositions.length; ++i) {
-			x += xPositions[i];
-			y += yPositions[i];
+			if (xPositions[ i ]) {
+				x += xPositions[i];
+				y += yPositions[i];
+			}
 		}
 
 		return {