only add ':' to legend if x value formatter returns a value

[dygraphs.git] / plugins / legend.js

diff --git a/plugins/legend.js b/plugins/legend.js
index f5f4711..9a7caf9 100644 (file)
--- a/plugins/legend.js
+++ b/plugins/legend.js
@@ -209,7 +209,10 @@ var generateLegendHTML = function(g, x, sel_points, oneEmWidth) {
   // TODO(danvk): remove this use of a private API
   var xOptView = g.optionsViewForAxis_('x');
   var xvf = xOptView('valueFormatter');
-  html = xvf(x, xOptView, labels[0], g) + ":";
+  html = xvf(x, xOptView, labels[0], g);
+  if(html) {
+       html += ':';
+  }
 
   var yOptViews = [];
   var num_axes = g.numAxes();