jsrrdgraph: RrdGraph.js: make HRULE support reference to variable

The value of HRULE could be a reference to for example a VDEF variable.

Closes #85

1 files changed, 3 insertions, 1 deletions

diff --git a/js/RrdGraph.js b/js/RrdGraph.js
index 9d35581..dfbbc07 100644
--- a/js/RrdGraph.js
+++ b/js/RrdGraph.js
@@ -379,7 +379,9 @@ RrdGraphDesc.prototype.vrule = function (graph, time, color, legend)
 RrdGraphDesc.prototype.hrule = function (graph, value, color, legend)
 {
         this.gf = RrdGraphDesc.GF_HRULE;
-        this.yrule = value;
+        this.vidx = graph.find_var(value);
+        if (this.vidx == -1)
+                this.yrule = value;
         this.col = color;
         if (legend === undefined) this.legend = '';
         else this.legend = '  '+legend;