Graph: Fix for axis format none broken for numbers in exponential notation, Closes #696

CHANGELOG.md

@@ -5,6 +5,9 @@
 - [Issue #578](https://github.com/grafana/grafana/issues/578). Dashboard: Row option to display row title even when the row is visible
 - [Issue #672](https://github.com/grafana/grafana/issues/672). Dashboard: panel fullscreen & edit state is present in url, can now link to graph in edit & fullscreen mode.
 
+**Fixes**
+- [Issue #696](https://github.com/grafana/grafana/issues/696). Graph: fix for y-axis format 'none' when values are in scientific notation (ex 2.3e-13)
+
 **Tech**
 - Upgraded from angularjs 1.1.5 to 1.3 beta 17;
 - Switch from underscore to lodash

src/app/components/kbn.js

@@ -525,10 +525,33 @@ function($, _, moment) {
         return kbn.nanosFormat(val, decimals);
       };
     default:
-      return function(val) {
-        return val % 1 === 0 ? val : val.toFixed(decimals);
+      return function(val, axis) {
+        return kbn.noneFormat(val, axis ? axis.tickDecimals : decimals);
+      };
+    }
   };
+
+  kbn.noneFormat = function(value, decimals) {
+    var factor = decimals ? Math.pow(10, decimals) : 1;
+    var formatted = String(Math.round(value * factor) / factor);
+
+    // if exponent return directly
+    if (formatted.indexOf('e') !== -1) {
+      return formatted;
     }
+
+    // If tickDecimals was specified, ensure that we have exactly that
+    // much precision; otherwise default to the value's own precision.
+
+    if (decimals != null) {
+      var decimalPos = formatted.indexOf(".");
+      var precision = decimalPos === -1 ? 0 : formatted.length - decimalPos - 1;
+      if (precision < decimals) {
+        return (precision ? formatted : formatted + ".") + (String(factor)).substr(1, decimals - precision);
+      }
+    }
+
+    return formatted;
   };
 
   kbn.msFormat = function(size, decimals) {

src/app/controllers/dashLoader.js

@@ -23,16 +23,6 @@ function (angular, _, moment, config) {
         $scope.zoom(2);
       });
 
-      var count = 0;
-      $scope.$watch(function() {
-        console.log(1);
-        count++;
-      }, function(n, o) {
-      });
-
-      setTimeout(function() {
-       console.log("Total count:" + count);
-      }, 4000);
     };
 
     $scope.set_default = function() {

src/app/directives/grafanaGraph.js

@@ -303,10 +303,8 @@ function (angular, $, kbn, moment, _) {
         }
 
         function configureAxisMode(axis, format) {
-          if (format !== 'none') {
           axis.tickFormatter = kbn.getFormatFunction(format, 1);
         }
-        }
 
         function time_format(interval, ticks, min, max) {
           if (min && max && ticks) {

src/app/directives/grafanaSimplePanel.js

 define([
   'angular',
-  'lodash'
 ],
-function (angular, _) {
+function (angular) {
   'use strict';
 
   angular

src/test/specs/kbn-format-specs.js

@@ -22,6 +22,20 @@ define([
 
   });
 
+  describe('high negative exponent, issue #696', function() {
+    it('should ignore decimal correction if exponent', function() {
+      var str = kbn.getFormatFunction('')(2.75e-10, { tickDecimals: 12 });
+      expect(str).to.be('2.75e-10');
+    });
+  });
+
+  describe('none format tests', function() {
+    it('should translate 2 as 2.0000 if axis decimals is 4', function() {
+      var str = kbn.getFormatFunction('')(2, { tickDecimals: 4 });
+      expect(str).to.be('2.0000');
+    });
+  });
+
   describe('nanosecond formatting', function () {
 
     it('should translate 25 to 25 ns', function () {