Format scientific float (#1007)

* modidy printFloat to check for having a certain amount of digits to force showing scientific notation
* add test cases for floats displaying properly

js/utils/helpers.js

@@ -1817,7 +1817,21 @@
             if (options.numFracDigits) {
                 value = value.toFixed(options.numFracDigits); // toFixed() rounds the value, is ok?
             } else {
-                value = value.toFixed(4);
+                // if the float has 13 digits or more (1 trillion or greater)
+                // or the float has 7 decimals or more, use scientific notation
+                //    NOTE: javascript in browser uses 22 as the threshold for large numbers
+                //          If there are 22 digits or more, then scientific notation is used
+                //          ecmascript language spec: https://262.ecma-international.org/5.1/#sec-9.8.1
+                if (Math.abs(value) >= 1000000000000 || Math.abs(value) < 0.000001) {
+                    // this also ensures there are more digits than the precision used 
+                    // so the number will be converted to scientific notation instead of
+                    // being padded with zeroes with no conversion
+                    // for example: 0.000001.toPrecision(4) ==> '0.000001000'
+                    value = value.toPrecision(5)
+                } else {
+                    value = value.toFixed(4);
+                }
+
             }
 
             // Remove leading zeroes

test/specs/print_utils/tests/01.print_utils.js

@@ -12,6 +12,17 @@ exports.execute = function (options) {
             expect(printFloat(1234.0, options)).toBe('1,234.0000');
             expect(printFloat(23.0)).toBe('23.0000');
             expect(printFloat(.000)).toBe('0.0000');
+
+            // scientific notation tests
+            expect(printFloat(100000000000)).toBe('100,000,000,000.0000');
+            expect(printFloat(1000000000000)).toBe('1.0000e+12');
+            expect(printFloat(.000001)).toBe('0.0000');
+            expect(printFloat(.0000001)).toBe('1.0000e-7');
+
+            expect(printFloat(1e11)).toBe('100,000,000,000.0000');
+            expect(printFloat(1e12)).toBe('1.0000e+12');
+            expect(printFloat(1e-6)).toBe('0.0000');
+            expect(printFloat(1e-7)).toBe('1.0000e-7');
         });
 
         it('printBoolean() should format booleans correctly.', function () {