Fix timeseries data loading

c3.js

@@ -1253,7 +1253,7 @@
         function generateTargetX(rawX, id, index) {
             var x;
             if (isTimeSeries) {
-                x = rawX ? rawX instanceof Date ? rawX : parseDate(rawX) : null;
+                x = rawX ? rawX instanceof Date ? rawX : parseDate(rawX) : parseDate(getXValue(id, index));
             }
             else if (isCustomX && !isCategorized) {
                 x = rawX ? +rawX : getXValue(id, index);
@@ -1290,15 +1290,10 @@
         function convertDataToTargets(data) {
             var ids = d3.keys(data[0]).filter(isNotX), xs = d3.keys(data[0]).filter(isX), targets;
 
-            // check "x" is defined if timeseries
-            if (isTimeSeries && xs.length === 0) {
-                throw new Error('data.x or data.xs must be specified when axis.x.type == "timeseries"');
-            }
-
             // save x for update data by load when custom x and c3.x API
             ids.forEach(function (id) {
                 var xKey = getXKey(id);
-                if (isCustomX) {
+                if (isCustomX || isTimeSeries) {
                     if (xs.indexOf(xKey) >= 0) {
                         c3.data.x[id] = data.map(function (d) { return d[xKey]; });
                     }

htdocs/samples/timeseries.html

@@ -30,6 +30,25 @@
           }
         }
       });
+
+      setTimeout(function () {
+        chart.load({
+          columns: [
+            ['sample', 200, 130, 90, 240, 130, 100],
+            ['sample2', 300, 200, 160, 400, 250, 250]
+          ]
+        });
+      }, 1000);
+
+      setTimeout(function () {
+        chart.load({
+          columns: [
+            ['date', '20140101', '20140201', '20140301', '20140401', '20140501', '20140601'],
+            ['sample', 500, 630, 690, 440, 630, 900],
+            ['sample2', 400, 600, 460, 200, 350, 450]
+          ]
+        });
+      }, 2000);
     </script>
   </body>
 </html>