rangemode only applies to linear axes

src/plots/cartesian/axes.js

@@ -20,6 +20,8 @@ var Titles = require('../../components/titles');
 var Color = require('../../components/color');
 var Drawing = require('../../components/drawing');
 
+var axAttrs = require('./layout_attributes');
+
 var constants = require('../../constants/numerical');
 var ONEAVGYEAR = constants.ONEAVGYEAR;
 var ONEAVGMONTH = constants.ONEAVGMONTH;
@@ -2411,11 +2413,12 @@ function swapAxisGroup(gd, xIds, yIds) {
     for(i = 0; i < xIds.length; i++) xFullAxes.push(axes.getFromId(gd, xIds[i]));
     for(i = 0; i < yIds.length; i++) yFullAxes.push(axes.getFromId(gd, yIds[i]));
 
-    var allAxKeys = Object.keys(xFullAxes[0]),
-        noSwapAttrs = [
-            'anchor', 'domain', 'overlaying', 'position', 'side', 'tickangle'
-        ],
-        numericTypes = ['linear', 'log'];
+    var allAxKeys = Object.keys(axAttrs);
+
+    var noSwapAttrs = [
+        'anchor', 'domain', 'overlaying', 'position', 'side', 'tickangle', 'editType'
+    ];
+    var numericTypes = ['linear', 'log'];
 
     for(i = 0; i < allAxKeys.length; i++) {
         var keyi = allAxKeys[i],

src/plots/cartesian/axis_defaults.js

@@ -48,7 +48,7 @@ module.exports = function handleAxisDefaults(containerIn, containerOut, coerce,
     setConvert(containerOut, layoutOut);
 
     var autoRange = coerce('autorange', !containerOut.isValidRange(containerIn.range));
-    if(autoRange) coerce('rangemode');
+    if(autoRange && (axType === 'linear' || axType === '-')) coerce('rangemode');
 
     coerce('range');
     containerOut.cleanRange();

src/plots/cartesian/layout_attributes.js

@@ -99,7 +99,8 @@ module.exports = {
             'If *tozero*`, the range extends to 0,',
             'regardless of the input data',
             'If *nonnegative*, the range is non-negative,',
-            'regardless of the input data.'
+            'regardless of the input data.',
+            'Applies only to linear axes.'
         ].join(' ')
     },
     range: {

test/jasmine/tests/axes_test.js

@@ -403,6 +403,24 @@ describe('Test axes', function() {
             });
         });
 
+        it('only allows rangemode with linear axes', function() {
+            layoutIn = {
+                xaxis: {type: 'log', rangemode: 'tozero'},
+                yaxis: {type: 'date', rangemode: 'tozero'},
+                xaxis2: {type: 'category', rangemode: 'tozero'},
+                yaxis2: {type: 'linear', rangemode: 'tozero'}
+            };
+            layoutOut._subplots.cartesian.push('x2y2');
+            layoutOut._subplots.yaxis.push('x2', 'y2');
+
+            supplyLayoutDefaults(layoutIn, layoutOut, fullData);
+
+            expect(layoutOut.xaxis.rangemode).toBeUndefined();
+            expect(layoutOut.yaxis.rangemode).toBeUndefined();
+            expect(layoutOut.xaxis2.rangemode).toBeUndefined();
+            expect(layoutOut.yaxis2.rangemode).toBe('tozero');
+        });
+
         it('finds scaling groups and calculates relative scales', function() {
             layoutIn = {
                 // first group: linked in series, scales compound