handle radial axis

Author: archmoj

src/plots/cartesian/axes.js

@@ -1447,9 +1447,10 @@ function formatDate(ax, out, hover, extraPrecision) {
             else dateStr = headStr + (dateStr ? ', ' + dateStr : '');
         } else if(!ax._inCalcTicks || (headStr !== ax._prevDateHead)) {
             var isInside = (ax.ticklabelposition || '').indexOf('inside') !== -1;
+            var side = ax._realSide || ax.side; // polar mocks the side of the radial axis
             if(
-                (!isInside && ax.side === 'top') ||
-                (isInside && ax.side === 'bottom')
+                (!isInside && side === 'top') ||
+                (isInside && side === 'bottom')
             ) {
                 dateStr = headStr + '<br>' + dateStr;
             } else {

src/plots/polar/polar.js

@@ -255,6 +255,8 @@ proto.updateLayout = function(fullLayout, polarLayout) {
             counterclockwise: 'top',
             clockwise: 'bottom'
         }[radialLayout.side],
+        // keep track of real side
+        _realSide: radialLayout.side,
         // spans length 1 radius
         domain: [innerRadius / gs.w, radius / gs.w]
     });