feat(groupby): adding grouping strategy option #10223

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 All notable changes for each version of this project will be documented in this file.
 
+## 12.2.4
+
+### General
+- `igxGrid`
+    - Exposed a `groupStrategy` input that functions similarly to `sortStrategy`, allowing customization of the grouping behavior of the grid. Please, refer to the [Group By ](https://www.infragistics.com/products/ignite-ui-angular/angular/components/grid/groupby) topic for more information.
+
 ## 12.2.1
 
 ### New Features

projects/igniteui-angular/src/lib/data-operations/data-util.spec.ts

@@ -263,7 +263,7 @@ const testGroupBy = () => {
             // sort
             const res = DataUtil.sort(data, [expr]);
             // group by
-            DataUtil.group(res, state, null, groupRecords);
+            DataUtil.group(res, state, null, null, groupRecords);
             expect(groupRecords.length).toEqual(2);
             expect(groupRecords[0].records.length).toEqual(3);
             expect(groupRecords[1].records.length).toEqual(2);
@@ -279,7 +279,7 @@ const testGroupBy = () => {
             // sort
             const sorted = DataUtil.sort(data, [expr, expr2]);
              // group by
-            DataUtil.group(sorted, state, null, groupRecords);
+            DataUtil.group(sorted, state, null, null, groupRecords);
             expect(groupRecords.length).toEqual(2);
             expect(groupRecords[0].records.length).toEqual(3);
             expect(groupRecords[1].records.length).toEqual(2);

projects/igniteui-angular/src/lib/data-operations/data-util.ts

@@ -11,6 +11,7 @@ import { IGroupByRecord } from './groupby-record.interface';
 import { IGroupingState } from './groupby-state.interface';
 import { ISortingExpression } from './sorting-expression.interface';
 import { FilteringStrategy } from './filtering-strategy';
+import { IGridGroupingStrategy } from './grouping-strategy';
 import { ITreeGridRecord } from '../grids/tree-grid/public_api';
 import { cloneValue, mergeObjects, mkenum } from '../core/utils';
 import { Transaction, TransactionType, HierarchicalTransaction } from '../services/transaction/transaction';
@@ -73,9 +74,8 @@ export class DataUtil {
         return rec;
     }
 
-    public static group<T>(data: T[], state: IGroupingState, grid: GridType = null,
+    public static group<T>(data: T[], state: IGroupingState, grouping: IGridGroupingStrategy = new IgxGrouping(), grid: GridType = null,
         groupsRecords: any[] = [], fullResult: IGroupByResult = { data: [], metadata: [] }): IGroupByResult {
-        const grouping = new IgxGrouping();
         groupsRecords.splice(0, groupsRecords.length);
         return grouping.groupBy(data, state, grid, groupsRecords, fullResult);
     }

projects/igniteui-angular/src/lib/data-operations/grouping-strategy.ts

@@ -1,9 +1,14 @@
 import { IGroupByRecord } from './groupby-record.interface';
-import { IgxSorting } from './sorting-strategy';
+import { IgxSorting, IGridSortingStrategy } from './sorting-strategy';
 import { IGroupingState } from './groupby-state.interface';
 import { IGroupByResult } from './grouping-result.interface';
 
-export class IgxGrouping extends IgxSorting {
+
+export interface IGridGroupingStrategy extends IGridSortingStrategy {
+    groupBy(data: any[], state: IGroupingState, grid?: any, groupsRecords?: any[], fullResult?: IGroupByResult): IGroupByResult;
+}
+
+export class IgxGrouping extends IgxSorting implements IGridGroupingStrategy {
     public groupBy(data: any[], state: IGroupingState, grid?: any,
         groupsRecords?: any[], fullResult: IGroupByResult = { data: [], metadata: [] }): IGroupByResult {
         const metadata: IGroupByRecord[] = [];

projects/igniteui-angular/src/lib/grids/grid/grid.component.html

@@ -71,7 +71,7 @@
         | visibleColumns:hasVisibleColumns
         | gridFiltering:filteringExpressionsTree:filterStrategy:advancedFilteringExpressionsTree:id:pipeTrigger:filteringPipeTrigger
         | gridSort:sortingExpressions:sortStrategy:id:pipeTrigger
-        | gridGroupBy:groupingExpressions:groupingExpansionState:groupsExpanded:id:groupsRecords:pipeTrigger
+        | gridGroupBy:groupingExpressions:groupingExpansionState:groupStrategy:groupsExpanded:id:groupsRecords:pipeTrigger
         | gridPaging:paginator?.page:paginator?.perPage:id:pipeTrigger
         | gridSummary:hasSummarizedColumns:summaryCalculationMode:summaryPosition:id:showSummaryOnCollapse:pipeTrigger:summaryPipeTrigger
         | gridDetails:hasDetails:expansionStates:pipeTrigger

projects/igniteui-angular/src/lib/grids/grid/grid.component.ts

@@ -33,6 +33,7 @@ import { IgxGridGroupByAreaComponent } from '../grouping/grid-group-by-area.comp
 import { IgxGridCell } from '../grid-public-cell';
 import { CellType } from '../common/cell.interface';
 import { DeprecateMethod } from '../../core/deprecateDecorators';
+import { IGridGroupingStrategy } from '../../data-operations/grouping-strategy';
 
 let NEXT_ID = 0;
 
@@ -263,6 +264,10 @@ export class IgxGridComponent extends IgxGridBaseDirective implements GridType,
      * @hidden
      */
     protected _groupAreaTemplate: TemplateRef<any>;
+    /**
+     * @hidden
+     */
+    protected _groupStrategy: IGridGroupingStrategy;
     /**
      * @hidden
      */
@@ -455,6 +460,25 @@ export class IgxGridComponent extends IgxGridBaseDirective implements GridType,
         this._hideGroupedColumns = value;
     }
 
+    /**
+     * Gets/Sets the grouping strategy of the grid.
+     *
+     * @remarks The default IgxGrouping extends from IgxSorting and a custom one can be used as a `sortStrategy` as well.
+     *
+     * @example
+     * ```html
+     *  <igx-grid #grid [data]="localData" [groupStrategy]="groupStrategy"></igx-grid>
+     * ```
+     */
+    @Input()
+    public get groupStrategy(): IGridGroupingStrategy {
+        return this._groupStrategy;
+    }
+
+    public set groupStrategy(value: IGridGroupingStrategy) {
+        this._groupStrategy = value;
+    }
+
     /**
      * Gets/Sets the message displayed inside the GroupBy drop area where columns can be dragged on.
      *

projects/igniteui-angular/src/lib/grids/grid/grid.groupby.spec.ts

@@ -20,6 +20,7 @@ import { GridSelectionFunctions, GridFunctions } from '../../test-utils/grid-fun
 import { GridSelectionMode } from '../common/enums';
 import { ControlsFunction } from '../../test-utils/controls-functions.spec';
 import { IGroupingExpression } from '../../data-operations/grouping-expression.interface';
+import { IgxGrouping } from '../../data-operations/grouping-strategy';
 
 describe('IgxGrid - GroupBy #grid', () => {
 
@@ -602,6 +603,21 @@ describe('IgxGrid - GroupBy #grid', () => {
         expect(grid.groupingExpressionsChange.emit).toHaveBeenCalledTimes(0);
     }));
 
+    it('should group unbound column with custom grouping strategy', fakeAsync(() => {
+        const fix = TestBed.createComponent(GroupableGridComponent);
+        fix.componentInstance.data.forEach((r, i) => {
+            r['fieldValue1'] = Math.floor(i / 3);
+            r['fieldValue2'] = Math.floor(i / 4);
+        });
+        fix.detectChanges();
+        fix.componentInstance.instance.groupBy({
+            fieldName: 'UnboundField', dir: SortingDirection.Desc, ignoreCase: false
+        });
+        fix.detectChanges();
+        const groupRows = fix.componentInstance.instance.groupsRowList.toArray();
+        expect(groupRows.length).toEqual(4);
+    }));
+
     // GroupBy + Sorting integration
     it('should apply sorting on each group\'s records when non-grouped column is sorted.', fakeAsync(() => {
         const fix = TestBed.createComponent(DefaultGridComponent);
@@ -1848,36 +1864,36 @@ describe('IgxGrid - GroupBy #grid', () => {
         }));
 
     it('Should have the correct properties in the custom row selector template', fakeAsync(() => {
-            const fix = TestBed.createComponent(GridGroupByRowCustomSelectorsComponent);
-            const grid = fix.componentInstance.instance;
-            fix.componentInstance.width = '1200px';
-            tick();
-            grid.columnWidth = '200px';
-            tick();
-            grid.rowSelection = GridSelectionMode.multiple;
-            tick();
-            fix.detectChanges();
+        const fix = TestBed.createComponent(GridGroupByRowCustomSelectorsComponent);
+        const grid = fix.componentInstance.instance;
+        fix.componentInstance.width = '1200px';
+        tick();
+        grid.columnWidth = '200px';
+        tick();
+        grid.rowSelection = GridSelectionMode.multiple;
+        tick();
+        fix.detectChanges();
 
-            grid.groupBy({
-                fieldName: 'ProductName', dir: SortingDirection.Desc, ignoreCase: false
-            });
-            tick();
-            fix.detectChanges();
+        grid.groupBy({
+            fieldName: 'ProductName', dir: SortingDirection.Desc, ignoreCase: false
+        });
+        tick();
+        fix.detectChanges();
 
-            const grRow = grid.groupsRowList.toArray()[0];
-            const contextSelect = { selectedCount: 0, totalCount: 2, groupRow: grid.groupsRowList.toArray()[0].groupRow };
-            const contextUnselect = { selectedCount: 2, totalCount: 2, groupRow: grid.groupsRowList.toArray()[0].groupRow };
+        const grRow = grid.groupsRowList.toArray()[0];
+        const contextSelect = { selectedCount: 0, totalCount: 2, groupRow: grid.groupsRowList.toArray()[0].groupRow };
+        const contextUnselect = { selectedCount: 2, totalCount: 2, groupRow: grid.groupsRowList.toArray()[0].groupRow };
 
-            spyOn(fix.componentInstance, 'onGroupByRowClick').and.callThrough();
+        spyOn(fix.componentInstance, 'onGroupByRowClick').and.callThrough();
 
-            grRow.nativeElement.querySelector('.igx-checkbox__composite').click();
-            fix.detectChanges();
-            expect(fix.componentInstance.onGroupByRowClick).toHaveBeenCalledWith(fix.componentInstance.groupByRowClick, contextSelect);
+        grRow.nativeElement.querySelector('.igx-checkbox__composite').click();
+        fix.detectChanges();
+        expect(fix.componentInstance.onGroupByRowClick).toHaveBeenCalledWith(fix.componentInstance.groupByRowClick, contextSelect);
 
-            grRow.nativeElement.querySelector('.igx-checkbox__composite').click();
-            fix.detectChanges();
-            expect(fix.componentInstance.onGroupByRowClick).toHaveBeenCalledWith(fix.componentInstance.groupByRowClick, contextUnselect);
-        }));
+        grRow.nativeElement.querySelector('.igx-checkbox__composite').click();
+        fix.detectChanges();
+        expect(fix.componentInstance.onGroupByRowClick).toHaveBeenCalledWith(fix.componentInstance.groupByRowClick, contextUnselect);
+    }));
 
     // GroupBy + Resizing
     it('should retain same size for group row after a column is resized.', fakeAsync(() => {
@@ -3488,19 +3504,42 @@ export class DefaultGridComponent extends DataParent {
     }
 }
 
+const formatUnboundValueFunction = (rowData: any | undefined): string | undefined => rowData.fieldValue1 + ' ' + rowData.fieldValue2;
+
+
+class MySortingStrategy extends IgxGrouping {
+    protected getFieldValue(
+        obj: any,
+        key: string,
+        isDate = false,
+        isTime = false
+    ): unknown {
+        if (key !== 'UnboundField') {
+            return super.getFieldValue(obj, key, isDate, isTime);
+        }
+
+        return formatUnboundValueFunction(obj);
+    }
+}
+
 @Component({
     template: `
         <igx-grid
             [width]='width'
             [height]='height'
-            [data]="data">
+            [data]="data"
+            [sortStrategy]="sortStrategy"
+            [groupStrategy]="groupStrategy">
             <igx-column [field]="'ID'" [header]="'ID'" [width]="200" [groupable]="true" [hasSummary]="false"></igx-column>
             <igx-column [field]="'ReleaseDate'" [header]="'ReleaseDate'" [width]="200" [groupable]="true" [hasSummary]="false"
                 dataType="date"></igx-column>
             <igx-column [field]="'Downloads'" [header]="'Downloads'" [width]="200" [groupable]="true" [hasSummary]="false"
                 dataType="number"></igx-column>
             <igx-column [field]="'ProductName'" [header]="'ProductName'" [width]="200" [groupable]="true" [hasSummary]="false"></igx-column>
             <igx-column [field]="'Released'" [header]="'Released'" [width]="200" [groupable]="true" [hasSummary]="false"></igx-column>
+            <igx-column [field]="'UnboundField'" [header]="'Unbound Value'" [width]="200" [dataType]="'string'"
+                [sortable]="true" [groupable]="true" [formatter]="formatUnboundValue">
+            </igx-column>
             <igx-paginator></igx-paginator>
         </igx-grid>
     `
@@ -3511,6 +3550,13 @@ export class GroupableGridComponent extends DataParent {
 
     public width = '800px';
     public height = '700px';
+
+    public sortStrategy = new MySortingStrategy();
+    public groupStrategy = this.sortStrategy;
+
+    public formatUnboundValue(value: string, rowData: any | undefined): string | undefined {
+        return formatUnboundValueFunction(rowData);
+    }
 }
 
 @Component({

projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts

@@ -13,6 +13,7 @@ import { IgxGridBaseDirective } from '../grid-base.directive';
 import { GridType } from '../common/grid.interface';
 import { IFilteringStrategy } from '../../data-operations/filtering-strategy';
 import { IGridSortingStrategy } from '../../data-operations/sorting-strategy';
+import { IGridGroupingStrategy } from '../../data-operations/grouping-strategy';
 import { GridPagingMode } from '../common/enums';
 
 /**
@@ -60,7 +61,8 @@ export class IgxGridGroupingPipe implements PipeTransform {
     }
 
     public transform(collection: any[], expression: IGroupingExpression | IGroupingExpression[],
-        expansion: IGroupByExpandState | IGroupByExpandState[], defaultExpanded: boolean,
+        expansion: IGroupByExpandState | IGroupByExpandState[],
+        groupingStrategy: IGridGroupingStrategy, defaultExpanded: boolean,
         id: string, groupsRecords: any[], _pipeTrigger: number): IGroupByResult {
 
         const state = { expressions: [], expansion: [], defaultExpanded };
@@ -79,7 +81,7 @@ export class IgxGridGroupingPipe implements PipeTransform {
         } else {
             state.expansion = grid.groupingExpansionState;
             state.defaultExpanded = grid.groupsExpanded;
-            result = DataUtil.group(cloneArray(collection), state, grid, groupsRecords, fullResult);
+            result = DataUtil.group(cloneArray(collection), state, groupingStrategy, grid, groupsRecords, fullResult);
         }
         grid.groupingFlatResult = result.data;
         grid.groupingResult = fullResult.data;

projects/igniteui-angular/src/lib/services/exporter-common/base-export-service.ts

@@ -694,7 +694,7 @@ export abstract class IgxBaseExporter {
 
             if (hasGrouping && !this.options.ignoreGrouping) {
                 const groupsRecords = [];
-                DataUtil.group(cloneArray(gridData), groupedGridGroupingState, grid, groupsRecords);
+                DataUtil.group(cloneArray(gridData), groupedGridGroupingState, grid.groupStrategy, grid, groupsRecords);
                 gridData = groupsRecords;
             }