don't ignore zero values in the first column of DataTables

[dygraphs.git] / dygraph.js

diff --git a/dygraph.js b/dygraph.js
index 23b68e4..1383bcb 100644 (file)
--- a/dygraph.js
+++ b/dygraph.js
@@ -1645,7 +1645,13 @@ Dygraph.prototype.parseDataTable_ = function(data) {
   var ret = [];
   for (var i = 0; i < rows; i++) {
     var row = [];
-    if (!data.getValue(i, 0)) continue;
+    if (typeof(data.getValue(i, 0)) === 'undefined' ||
+        data.getValue(i, 0) === null) {
+      this.warning("Ignoring row " + i +
+                   " of DataTable because of undefined or null first column.");
+      continue;
+    }
+
     if (indepType == 'date') {
       row.push(data.getValue(i, 0).getTime());
     } else {