Merge pull request #1990 from COzero/feature/add-max-min-tick-format

feat($axis): Add ability to set different tick format for max/min

Author: liquidpele

src/models/axis.js

@@ -22,6 +22,7 @@ nv.models.axis = function() {
         , fontSize = undefined
         , duration = 250
         , dispatch = d3.dispatch('renderEnd')
+        , tickFormatMaxMin
         ;
     axis
         .scale(scale)
@@ -106,7 +107,8 @@ nv.models.axis = function() {
                             .attr('y', -axis.tickPadding())
                             .attr('text-anchor', 'middle')
                             .text(function(d,i) {
-                                var v = fmt(d);
+                                var formatter = tickFormatMaxMin || fmt;
+                                var v = formatter(d);
                                 return ('' + v).match('NaN') ? '' : v;
                             });
                         axisMaxMin.watchTransition(renderWatch, 'min-max top')
@@ -123,7 +125,7 @@ nv.models.axis = function() {
                     var rotateLabelsRule = '';
                     if (rotateLabels%360) {
                         //Reset transform on ticks so textHeight can be calculated correctly
-                        xTicks.attr('transform', ''); 
+                        xTicks.attr('transform', '');
                         //Calculate the longest xTick width
                         xTicks.each(function(d,i){
                             var box = this.getBoundingClientRect();
@@ -181,7 +183,8 @@ nv.models.axis = function() {
                             .attr('transform', rotateLabelsRule)
                             .style('text-anchor', rotateLabels ? (rotateLabels%360 > 0 ? 'start' : 'end') : 'middle')
                             .text(function(d,i) {
-                                var v = fmt(d);
+                                var formatter = tickFormatMaxMin || fmt;
+                                var v = formatter(d);
                                 return ('' + v).match('NaN') ? '' : v;
                             });
                         axisMaxMin.watchTransition(renderWatch, 'min-max bottom')
@@ -216,7 +219,8 @@ nv.models.axis = function() {
                             .attr('x', axis.tickPadding())
                             .style('text-anchor', 'start')
                             .text(function(d, i) {
-                                var v = fmt(d);
+                                var formatter = tickFormatMaxMin || fmt;
+                                var v = formatter(d);
                                 return ('' + v).match('NaN') ? '' : v;
                             });
                         axisMaxMin.watchTransition(renderWatch, 'min-max right')
@@ -260,7 +264,8 @@ nv.models.axis = function() {
                             .attr('x', -axis.tickPadding())
                             .attr('text-anchor', 'end')
                             .text(function(d,i) {
-                                var v = fmt(d);
+                                var formatter = tickFormatMaxMin || fmt;
+                                var v = formatter(d);
                                 return ('' + v).match('NaN') ? '' : v;
                             });
                         axisMaxMin.watchTransition(renderWatch, 'min-max right')
@@ -331,9 +336,9 @@ nv.models.axis = function() {
                     and the arithmetic trick below solves that.
                     */
                     return !parseFloat(Math.round(d * 100000) / 1000000) && (d !== undefined)
-                }) 
+                })
                 .classed('zero', true);
-            
+
             //store old scales for use in transitions on update
             scale0 = scale.copy();
 
@@ -364,6 +369,7 @@ nv.models.axis = function() {
         ticks:             {get: function(){return ticks;}, set: function(_){ticks=_;}},
         width:             {get: function(){return width;}, set: function(_){width=_;}},
         fontSize:          {get: function(){return fontSize;}, set: function(_){fontSize=_;}},
+        tickFormatMaxMin:  {get: function(){return tickFormatMaxMin;}, set: function(_){tickFormatMaxMin=_;}},
 
         // options that require extra logic in the setter
         margin: {get: function(){return margin;}, set: function(_){

test/mocha/axis.coffee

@@ -153,3 +153,18 @@ describe 'NVD3', ->
 
             tick = builder.$ '.nv-y.nv-axis .tick.zero'
             tick.length.should.equal 1, 'y axis zero'
+
+        it 'default tick format for max/min should be integer based', ->
+            axis = builder.model.xAxis
+            builder.model.update()
+            minAxisText = builder.$('.nv-axisMaxMin.nv-axisMaxMin-x.nv-axisMin-x text')[0].textContent
+
+            minAxisText.should.equal('-1')
+
+        it 'tickFormatMaxMin should change tick format of max/min', ->
+            axis = builder.model.xAxis
+            axis.tickFormatMaxMin(d3.format(',.2f'))
+            builder.model.update()
+            minAxisText = builder.$('.nv-axisMaxMin.nv-axisMaxMin-x.nv-axisMin-x text')[0].textContent
+
+            minAxisText.should.equal('-1.00')