Number formatting: only 0-trim decimals in y axis ticks. omit currency, locale units. (#57386)

packages/grafana-data/src/field/displayProcessor.test.ts

@@ -305,7 +305,7 @@ describe('Format value', () => {
     const value = 1200;
     const instance = getDisplayProcessorFromConfig({ decimals: null, unit: 'short' });
     const disp = instance(value);
-    expect(disp.text).toEqual('1.2');
+    expect(disp.text).toEqual('1.20');
     expect(disp.suffix).toEqual(' K');
   });
 
@@ -329,7 +329,7 @@ describe('Format value', () => {
     const value = 1500000;
     const instance = getDisplayProcessorFromConfig({ decimals: null, unit: 'short' });
     const disp = instance(value);
-    expect(disp.text).toEqual('1.5');
+    expect(disp.text).toEqual('1.50');
     expect(disp.suffix).toEqual(' Mil');
   });
 
@@ -376,6 +376,53 @@ describe('Format value', () => {
       expect(disp.text).toEqual(value);
     });
   });
+
+  describe('number formatting for y axis ticks (dynamic decimals with trailing 0s trimming)', () => {
+    // all these tests have non-null adjacentDecimals != null, which we only do durink axis tick formatting
+
+    it('should trim trailing zeros after decimal from fractional seconds when formatted as millis with adjacentDecimals=2', () => {
+      const processor = getDisplayProcessorFromConfig({ unit: 's' }, FieldType.number);
+      expect(processor(0.06, 2).text).toEqual('60');
+    });
+
+    it('should trim trailing zeros after decimal from number', () => {
+      const processor = getDisplayProcessorFromConfig({}, FieldType.number);
+      expect(processor(1.2, 2).text).toEqual('1.2');
+
+      // dynamic!
+      expect(processor(13.50008, 3).text).toEqual('13.5');
+    });
+
+    it('should not attempt to trim zeros from currency*', () => {
+      const processor = getDisplayProcessorFromConfig({ unit: 'currencyUSD' }, FieldType.number);
+      expect(processor(1.2, 2).text).toEqual('1.20');
+    });
+
+    it('should not attempt to trim zeros from bool', () => {
+      const processor = getDisplayProcessorFromConfig({ unit: 'bool' }, FieldType.number);
+      expect(processor(1, 2).text).toEqual('True');
+    });
+
+    it('should not attempt to trim zeros from time', () => {
+      const processor = getDisplayProcessorFromConfig({}, FieldType.time);
+      expect(processor(1666402869517, 2).text).toEqual('2022-10-21 20:41:09');
+    });
+
+    it('should not attempt to trim zeros from dateTimeAsUS', () => {
+      const processor = getDisplayProcessorFromConfig({ unit: 'dateTimeAsUS' }, FieldType.number);
+      expect(processor(1666402869517, 2).text).toEqual('10/21/2022 8:41:09 pm');
+    });
+
+    it('should not attempt to trim zeros from locale', () => {
+      const processor = getDisplayProcessorFromConfig({ unit: 'locale' }, FieldType.number);
+      expect(processor(3500000, 2).text).toEqual('3,500,000');
+    });
+
+    it('should not attempt to trim zeros when explicit decimals: 5', () => {
+      const processor = getDisplayProcessorFromConfig({ decimals: 5 }, FieldType.number);
+      expect(processor(35, 2).text).toEqual('35.00000');
+    });
+  });
 });
 
 describe('Date display options', () => {

packages/grafana-data/src/field/displayProcessor.ts

@@ -10,7 +10,7 @@ import { Field, FieldType } from '../types/dataFrame';
 import { DecimalCount, DisplayProcessor, DisplayValue } from '../types/displayValue';
 import { anyToNumber } from '../utils/anyToNumber';
 import { getValueMappingResult } from '../utils/valueMappings';
-import { getValueFormat, isBooleanUnit } from '../valueFormats/valueFormats';
+import { FormattedValue, getValueFormat, isBooleanUnit } from '../valueFormats/valueFormats';
 
 import { getScaleCalculator } from './scale';
 
@@ -72,16 +72,17 @@ export function getDisplayProcessor(options?: DisplayProcessorOptions): DisplayP
     unit = 'string';
   }
 
+  const hasCurrencyUnit = unit?.startsWith('currency');
   const hasBoolUnit = unit === 'bool';
   const isNumType = field.type === FieldType.number;
   const isLocaleFormat = unit === 'locale';
-  const shouldTrimTrailingDecimalZeros =
+  const canTrimTrailingDecimalZeros =
-    !hasDateUnit && !hasBoolUnit && !isLocaleFormat && isNumType && config.decimals == null;
+    !hasDateUnit && !hasCurrencyUnit && !hasBoolUnit && !isLocaleFormat && isNumType && config.decimals == null;
 
   const formatFunc = getValueFormat(unit || 'none');
   const scaleFunc = getScaleCalculator(field, options.theme);
 
-  return (value: any, decimals?: DecimalCount) => {
+  return (value: any, adjacentDecimals?: DecimalCount) => {
     const { mappings } = config;
     const isStringUnit = unit === 'string';
 
@@ -117,14 +118,18 @@ export function getDisplayProcessor(options?: DisplayProcessorOptions): DisplayP
 
     if (!Number.isNaN(numeric)) {
       if (text == null && !isBoolean(value)) {
-        const v = formatFunc(numeric, decimals ?? config.decimals, null, options.timeZone, showMs);
+        let v: FormattedValue;
+
+        if (canTrimTrailingDecimalZeros && adjacentDecimals != null) {
+          v = formatFunc(numeric, adjacentDecimals, null, options.timeZone, showMs);
 
           // if no explicit decimals config, we strip trailing zeros e.g. 60.00 -> 60
-        // this is needed because we may have determined the minimum required `decimals` for y tick increments based on
+          // this is needed because we may have determined the minimum determined `adjacentDecimals` for y tick increments based on
           // e.g. 'seconds' field unit (0.15s, 0.20s, 0.25s), but then formatFunc decided to return milli or nanos (150, 200, 250)
           // so we end up with excess precision: 150.00, 200.00, 250.00
-        if (shouldTrimTrailingDecimalZeros) {
           v.text = +v.text + '';
+        } else {
+          v = formatFunc(numeric, config.decimals, null, options.timeZone, showMs);
         }
 
         text = v.text;

packages/grafana-ui/src/components/TimeSeries/utils.ts

@@ -279,7 +279,7 @@ export const preparePlotConfigBuilder: UPlotConfigPrepFn<{
             label: customConfig.axisLabel,
             size: customConfig.axisWidth,
             placement: customConfig.axisPlacement ?? AxisPlacement.Auto,
-            formatValue: (v, decimals) => formattedValueToString(fmt(v, config.decimals ?? decimals)),
+            formatValue: (v, decimals) => formattedValueToString(fmt(v, decimals)),
             theme,
             grid: { show: customConfig.axisGridShow },
             decimals: field.config.decimals,

public/app/plugins/panel/barchart/utils.ts

@@ -253,7 +253,7 @@ export const preparePlotConfigBuilder: UPlotConfigPrepFn<BarChartOptionsEX> = ({
         label: customConfig.axisLabel,
         size: customConfig.axisWidth,
         placement,
-        formatValue: (v, decimals) => formattedValueToString(field.display!(v, field.config.decimals ?? decimals)),
+        formatValue: (v, decimals) => formattedValueToString(field.display!(v, decimals)),
         theme,
         grid: { show: customConfig.axisGridShow },
       });

public/app/plugins/panel/heatmap/utils.ts

@@ -408,7 +408,7 @@ export function prepConfig(opts: PrepConfigOpts) {
     size: yAxisConfig.axisWidth || null,
     label: yAxisConfig.axisLabel,
     theme: theme,
-    formatValue: (v, decimals) => formattedValueToString(dispY(v, yField.config.decimals ?? decimals)),
+    formatValue: (v, decimals) => formattedValueToString(dispY(v, decimals)),
     splits: isOrdianalY
       ? (self: uPlot) => {
           const meta = readHeatmapRowsCustomMeta(dataRef.current?.heatmap);

public/app/plugins/panel/histogram/Histogram.tsx

@@ -153,7 +153,7 @@ const prepConfig = (frame: DataFrame, theme: GrafanaTheme2) => {
     scaleKey: 'y',
     isTime: false,
     placement: AxisPlacement.Left,
-    formatValue: (v, decimals) => formattedValueToString(dispY!(v, countField.config.decimals ?? decimals)),
+    formatValue: (v, decimals) => formattedValueToString(dispY!(v, decimals)),
     //splits: config.xSplits,
     //values: config.xValues,
     //grid: false,