Table: Adds new footer feature that can show Totals or other column calculations (#38653)

* table footer for showing calculations

Co-authored-by: Ryan McKinley <ryantxu@gmail.com>

devenv/dev-dashboards/panel-table/table_tests_new.json

@@ -132,7 +132,7 @@
           }
         ]
       },
-      "pluginVersion": "7.5.0-pre",
+      "pluginVersion": "",
       "targets": [
         {
           "refId": "A",
@@ -263,7 +263,7 @@
           }
         ]
       },
-      "pluginVersion": "7.5.0-pre",
+      "pluginVersion": "",
       "targets": [
         {
           "refId": "A",
@@ -351,7 +351,7 @@
         "showHeader": true,
         "sortBy": []
       },
-      "pluginVersion": "7.5.0-pre",
+      "pluginVersion": "",
       "targets": [
         {
           "refId": "A",
@@ -387,7 +387,7 @@
     },
     {
       "collapsed": false,
-      "datasource": null,
+      "datasource": "gdev-testdata",
       "gridPos": {
         "h": 1,
         "w": 24,
@@ -460,7 +460,7 @@
                 "value": [
                   {
                     "title": "Details",
-                    "url": "http://detail?serverLabel=${__field.labels.server}&valueNumeric=${__value.numeric}"
+                    "url": "http://detail?serverLabel=${__field.labels.server}&valueNumeric=${__value.numeric}"
                   }
                 ]
               }
@@ -479,7 +479,7 @@
       "options": {
         "showHeader": true
       },
-      "pluginVersion": "7.5.0-pre",
+      "pluginVersion": "",
       "targets": [
         {
           "alias": "S1",
@@ -571,7 +571,7 @@
           }
         ]
       },
-      "pluginVersion": "7.5.0-pre",
+      "pluginVersion": "",
       "targets": [
         {
           "refId": "A",
@@ -604,6 +604,55 @@
         }
       ],
       "type": "table"
+    },
+    {
+      "datasource": "gdev-testdata",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "custom": {
+            "align": "auto",
+            "displayMode": "auto"
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": 0
+              },
+              {
+                "color": "red",
+                "value": 80
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 26
+      },
+      "id": 12,
+      "options": {
+        "footer": {
+          "show": true,
+          "fields": "",
+          "reducer": [
+            "sum"
+          ]
+        },
+        "showHeader": true
+      },
+      "pluginVersion": "",
+      "title": "Footer",
+      "type": "table"
     }
   ],
   "schemaVersion": 27,
@@ -635,5 +684,5 @@
   "timezone": "",
   "title": "Panel Tests - React Table",
   "uid": "U_bZIMRMk",
-  "version": 1
+  "version": 6
 }

public/app/plugins/panel/table/TablePanel.tsx

@@ -1,5 +1,4 @@
 import React, { Component } from 'react';
-
 import { Select, Table } from '@grafana/ui';
 import { DataFrame, FieldMatcherID, getFrameDisplayName, PanelProps, SelectableValue } from '@grafana/data';
 import { PanelOptions } from './models.gen';
@@ -9,6 +8,7 @@ import { FilterItem, TableSortByFieldState } from '@grafana/ui/src/components/Ta
 import { dispatch } from '../../../store/store';
 import { applyFilterFromTable } from '../../../features/variables/adhoc/actions';
 import { getDashboardSrv } from '../../../features/dashboard/services/DashboardSrv';
+import { getFooterCells } from './footer';
 
 interface Props extends PanelProps<PanelOptions> {}
 
@@ -79,6 +79,7 @@ export class TablePanel extends Component<Props> {
 
   renderTable(frame: DataFrame, width: number, height: number) {
     const { options } = this.props;
+    const footerValues = options.footer?.show ? getFooterCells(frame, options.footer) : undefined;
 
     return (
       <Table
@@ -92,21 +93,21 @@ export class TablePanel extends Component<Props> {
         onSortByChange={this.onSortByChange}
         onColumnResize={this.onColumnResize}
         onCellFilterAdded={this.onCellFilterAdded}
+        footerValues={footerValues}
       />
     );
   }
 
-  getCurrentFrameIndex() {
-    const { data, options } = this.props;
-    const count = data.series?.length;
-    return options.frameIndex > 0 && options.frameIndex < count ? options.frameIndex : 0;
+  getCurrentFrameIndex(frames: DataFrame[], options: PanelOptions) {
+    return options.frameIndex > 0 && options.frameIndex < frames.length ? options.frameIndex : 0;
   }
 
   render() {
-    const { data, height, width } = this.props;
+    const { data, height, width, options } = this.props;
 
-    const count = data.series?.length;
-    const hasFields = data.series[0]?.fields.length;
+    const frames = data.series;
+    const count = frames?.length;
+    const hasFields = frames[0]?.fields.length;
 
     if (!count || !hasFields) {
       return <div className={tableStyles.noData}>No data</div>;
@@ -115,8 +116,8 @@ export class TablePanel extends Component<Props> {
     if (count > 1) {
       const inputHeight = config.theme.spacing.formInputHeight;
       const padding = 8 * 2;
-      const currentIndex = this.getCurrentFrameIndex();
-      const names = data.series.map((frame, index) => {
+      const currentIndex = this.getCurrentFrameIndex(frames, options);
+      const names = frames.map((frame, index) => {
         return {
           label: getFrameDisplayName(frame),
           value: index,

public/app/plugins/panel/table/footer.ts

@@ -0,0 +1,40 @@
+import {
+  DataFrame,
+  Field,
+  FieldType,
+  formattedValueToString,
+  getDisplayProcessor,
+  reduceField,
+  fieldReducers,
+} from '@grafana/data';
+import { FooterItem } from '@grafana/ui/src/components/Table/types';
+import { TableFooterCalc } from './models.gen';
+import { config } from 'app/core/config';
+
+export function getFooterCells(frame: DataFrame, options?: TableFooterCalc): FooterItem[] {
+  return frame.fields.map((field, i) => {
+    if (field.type !== FieldType.number) {
+      // show the reducer in the first column
+      if (i === 0 && options && options.reducer.length > 0) {
+        const reducer = fieldReducers.get(options.reducer[0]);
+        return reducer.name;
+      }
+      return undefined;
+    }
+    if (options?.fields && options.fields.length > 0) {
+      const f = options.fields.find((f) => f === field.name);
+      if (f) {
+        return getFormattedValue(field, options.reducer);
+      }
+      return undefined;
+    }
+    return getFormattedValue(field, options?.reducer || []);
+  });
+}
+
+function getFormattedValue(field: Field, reducer: string[]) {
+  const fmt = field.display ?? getDisplayProcessor({ field, theme: config.theme2 });
+  const calc = reducer[0];
+  const v = reduceField({ field, reducers: reducer })[calc];
+  return formattedValueToString(fmt(v));
+}

public/app/plugins/panel/table/models.gen.ts

@@ -16,12 +16,23 @@ export interface PanelOptions {
   showHeader: boolean;
   showTypeIcons?: boolean;
   sortBy?: TableSortByFieldState[];
+  footer?: TableFooterCalc; // TODO: should be array (options builder is limited)
+}
+
+export interface TableFooterCalc {
+  show: boolean;
+  reducer: string[]; // actually 1 value
+  fields?: string[];
 }
 
 export const defaultPanelOptions: PanelOptions = {
   frameIndex: 0,
   showHeader: true,
   showTypeIcons: false,
+  footer: {
+    show: false,
+    reducer: [],
+  },
 };
 
 export interface PanelFieldConfig {

public/app/plugins/panel/table/module.tsx

@@ -1,4 +1,11 @@
-import { PanelPlugin } from '@grafana/data';
+import {
+  FieldOverrideContext,
+  FieldType,
+  getFieldDisplayName,
+  PanelPlugin,
+  ReducerID,
+  standardEditorsRegistry,
+} from '@grafana/data';
 import { TablePanel } from './TablePanel';
 import { PanelOptions, PanelFieldConfig, defaultPanelOptions, defaultPanelFieldConfig } from './models.gen';
 import { tableMigrationHandler, tablePanelChangedHandler } from './migrations';
@@ -75,10 +82,52 @@ export const plugin = new PanelPlugin<PanelOptions, PanelFieldConfig>(TablePanel
     },
   })
   .setPanelOptions((builder) => {
-    builder.addBooleanSwitch({
-      path: 'showHeader',
-      name: 'Show header',
-      description: "To display table's header or not to display",
-      defaultValue: defaultPanelOptions.showHeader,
-    });
+    builder
+      .addBooleanSwitch({
+        path: 'showHeader',
+        name: 'Show header',
+        description: "To display table's header or not to display",
+        defaultValue: defaultPanelOptions.showHeader,
+      })
+      .addBooleanSwitch({
+        path: 'footer.show',
+        name: 'Show Footer',
+        description: "To display table's footer or not to display",
+        defaultValue: defaultPanelOptions.footer?.show,
+      })
+      .addCustomEditor({
+        id: 'footer.reducer',
+        path: 'footer.reducer',
+        name: 'Calculation',
+        description: 'Choose a reducer function / calculation',
+        editor: standardEditorsRegistry.get('stats-picker').editor as any,
+        defaultValue: [ReducerID.sum],
+        showIf: (cfg) => cfg.footer?.show,
+      })
+      .addMultiSelect({
+        path: 'footer.fields',
+        name: 'Fields',
+        description: 'Select the fields that should be calculated',
+        settings: {
+          allowCustomValue: false,
+          options: [],
+          placeholder: 'All Numeric Fields',
+          getOptions: async (context: FieldOverrideContext) => {
+            const options = [];
+            if (context && context.data && context.data.length > 0) {
+              const frame = context.data[0];
+              for (const field of frame.fields) {
+                if (field.type === FieldType.number) {
+                  const name = getFieldDisplayName(field, frame, context.data);
+                  const value = field.name;
+                  options.push({ value, label: name } as any);
+                }
+              }
+            }
+            return options;
+          },
+        },
+        defaultValue: '',
+        showIf: (cfg) => cfg.footer?.show,
+      });
   });