[DataGrid] Add getFilterState method

docs/data/data-grid/filtering-recipes/FilteredRowCount.js

@@ -0,0 +1,88 @@
+import * as React from 'react';
+import Box from '@mui/material/Box';
+import { DataGridPro, useGridApiRef } from '@mui/x-data-grid-pro';
+import { useDemoData } from '@mui/x-data-grid-generator';
+import Button from '@mui/material/Button';
+import Stack from '@mui/material/Stack';
+
+const predefinedFilters = [
+  {
+    label: 'All',
+    filterModel: { items: [] },
+  },
+  {
+    label: 'Filled',
+    filterModel: { items: [{ field: 'status', operator: 'is', value: 'Filled' }] },
+  },
+  {
+    label: 'Open',
+    filterModel: { items: [{ field: 'status', operator: 'is', value: 'Open' }] },
+  },
+  {
+    label: 'Rejected',
+    filterModel: { items: [{ field: 'status', operator: 'is', value: 'Rejected' }] },
+  },
+  {
+    label: 'Partially Filled',
+    filterModel: {
+      items: [{ field: 'status', operator: 'is', value: 'PartiallyFilled' }],
+    },
+  },
+];
+
+export default function FilteredRowCount() {
+  const { data } = useDemoData({
+    dataSet: 'Commodity',
+    rowLength: 1000,
+    maxColumns: 10,
+  });
+
+  const apiRef = useGridApiRef();
+
+  const [predefinedFiltersRowCount, setPredefinedFiltersRowCount] = React.useState(
+    [],
+  );
+
+  const getFilteredRowsCount = React.useCallback(
+    (filterModel) => {
+      const { filteredRowsLookup } = apiRef.current.getFilterState(filterModel);
+      return Object.keys(filteredRowsLookup).filter(
+        (rowId) => filteredRowsLookup[rowId] === true,
+      ).length;
+    },
+    [apiRef],
+  );
+
+  React.useEffect(() => {
+    // Calculate the row count for predefined filters
+    if (data.rows.length === 0) {
+      return;
+    }
+
+    setPredefinedFiltersRowCount(
+      predefinedFilters.map(({ filterModel }) => getFilteredRowsCount(filterModel)),
+    );
+  }, [apiRef, data.rows, getFilteredRowsCount]);
+
+  return (
+    <div style={{ overflow: 'hidden' }}>
+      <Stack direction="row" gap={1} mb={1} flexWrap="wrap">
+        {predefinedFilters.map(({ label, filterModel }, index) => {
+          const count = predefinedFiltersRowCount[index];
+          return (
+            <Button
+              key={label}
+              onClick={() => apiRef.current.setFilterModel(filterModel)}
+              variant="outlined"
+            >
+              {label} {count !== undefined ? `(${count})` : ''}
+            </Button>
+          );
+        })}
+      </Stack>
+      <Box sx={{ height: 520, width: '100%' }}>
+        <DataGridPro {...data} loading={data.rows.length === 0} apiRef={apiRef} />
+      </Box>
+    </div>
+  );
+}

docs/data/data-grid/filtering-recipes/FilteredRowCount.tsx

@@ -0,0 +1,88 @@
+import * as React from 'react';
+import Box from '@mui/material/Box';
+import { DataGridPro, useGridApiRef, GridFilterModel } from '@mui/x-data-grid-pro';
+import { useDemoData } from '@mui/x-data-grid-generator';
+import Button from '@mui/material/Button';
+import Stack from '@mui/material/Stack';
+
+const predefinedFilters: { label: string; filterModel: GridFilterModel }[] = [
+  {
+    label: 'All',
+    filterModel: { items: [] },
+  },
+  {
+    label: 'Filled',
+    filterModel: { items: [{ field: 'status', operator: 'is', value: 'Filled' }] },
+  },
+  {
+    label: 'Open',
+    filterModel: { items: [{ field: 'status', operator: 'is', value: 'Open' }] },
+  },
+  {
+    label: 'Rejected',
+    filterModel: { items: [{ field: 'status', operator: 'is', value: 'Rejected' }] },
+  },
+  {
+    label: 'Partially Filled',
+    filterModel: {
+      items: [{ field: 'status', operator: 'is', value: 'PartiallyFilled' }],
+    },
+  },
+];
+
+export default function FilteredRowCount() {
+  const { data } = useDemoData({
+    dataSet: 'Commodity',
+    rowLength: 1000,
+    maxColumns: 10,
+  });
+
+  const apiRef = useGridApiRef();
+
+  const [predefinedFiltersRowCount, setPredefinedFiltersRowCount] = React.useState<
+    number[]
+  >([]);
+
+  const getFilteredRowsCount = React.useCallback(
+    (filterModel: GridFilterModel) => {
+      const { filteredRowsLookup } = apiRef.current.getFilterState(filterModel);
+      return Object.keys(filteredRowsLookup).filter(
+        (rowId) => filteredRowsLookup[rowId] === true,
+      ).length;
+    },
+    [apiRef],
+  );
+
+  React.useEffect(() => {
+    // Calculate the row count for predefined filters
+    if (data.rows.length === 0) {
+      return;
+    }
+
+    setPredefinedFiltersRowCount(
+      predefinedFilters.map(({ filterModel }) => getFilteredRowsCount(filterModel)),
+    );
+  }, [apiRef, data.rows, getFilteredRowsCount]);
+
+  return (
+    <div style={{ overflow: 'hidden' }}>
+      <Stack direction="row" gap={1} mb={1} flexWrap="wrap">
+        {predefinedFilters.map(({ label, filterModel }, index) => {
+          const count = predefinedFiltersRowCount[index];
+          return (
+            <Button
+              key={label}
+              onClick={() => apiRef.current.setFilterModel(filterModel)}
+              variant="outlined"
+            >
+              {label} {count !== undefined ? `(${count})` : ''}
+            </Button>
+          );
+        })}
+      </Stack>
+      <Box sx={{ height: 520, width: '100%' }}>
+        <DataGridPro {...data} loading={data.rows.length === 0} apiRef={apiRef} />
+      </Box>
+    </div>
+  );
+}

docs/data/data-grid/filtering-recipes/filtering-recipes.md

@@ -13,3 +13,9 @@ Currently if you want to use the [Quick filter](/x/react-data-grid/filtering/qui
 A common use case is to have certain components positioned outside of the grid. Because of the way the grid context works this might not be a straightforward thing to do. The example below illustrates how this use case can be achieved.
 
 {{"demo": "QuickFilterOutsideOfGrid.js", "bg": "inline", "defaultCodeOpen": false}}
+
+## Calculating row count in advance  
+
+The [Grid API](/x/react-data-grid/api-object/#how-to-use-the-api-object) provides the [`getFilterState`](/x/api/data-grid/grid-api/#grid-api-prop-getFilterState) method, which allows you to display the row count for predefined filters upfront without applying filters to the Data Grid:
+
+{{"demo": "FilteredRowCount.js", "bg": "inline", "defaultCodeOpen": false}}

docs/pages/x/api/data-grid/grid-api.json

@@ -116,6 +116,12 @@
       "required": true,
       "isProPlan": true
     },
+    "getFilterState": {
+      "type": {
+        "description": "(filterModel: GridFilterModel) => GridStateCommunity['filter']"
+      },
+      "required": true
+    },
     "getLocaleText": {
       "type": {
         "description": "<T extends GridTranslationKeys>(key: T) => GridLocaleText[T]"

docs/pages/x/api/data-grid/grid-filter-api.json

@@ -7,6 +7,11 @@
       "description": "Deletes a <a href=\"/x/api/data-grid/grid-filter-item/\">GridFilterItem</a>.",
       "type": "(item: GridFilterItem) => void"
     },
+    {
+      "name": "getFilterState",
+      "description": "Returns the filter state for the given filter model without applying it to the data grid.",
+      "type": "(filterModel: GridFilterModel) => GridStateCommunity['filter']"
+    },
     { "name": "hideFilterPanel", "description": "Hides the filter panel.", "type": "() => void" },
     {
       "name": "ignoreDiacritics",

docs/translations/api-docs/data-grid/grid-api.json

@@ -66,6 +66,9 @@
       "description": "Returns the grid data as an exceljs workbook.<br />This method is used internally by <code>exportDataAsExcel</code>."
     },
     "getExpandedDetailPanels": { "description": "Returns the rows whose detail panel is open." },
+    "getFilterState": {
+      "description": "Returns the filter state for the given filter model without applying it to the data grid."
+    },
     "getLocaleText": { "description": "Returns the translation for the <code>key</code>." },
     "getPinnedColumns": { "description": "Returns which columns are pinned." },
     "getRootDimensions": { "description": "Returns the dimensions of the grid" },

packages/x-data-grid/src/hooks/features/filter/useGridFilter.tsx

@@ -107,21 +107,13 @@ export const useGridFilter = (
   const updateFilteredRows = React.useCallback(() => {
     apiRef.current.setState((state) => {
       const filterModel = gridFilterModelSelector(state, apiRef.current.instanceId);
-      const isRowMatchingFilters =
-        props.filterMode === 'client'
-          ? buildAggregatedFilterApplier(filterModel, apiRef, props.disableEval)
-          : null;
-
-      const filteringResult = apiRef.current.applyStrategyProcessor('filtering', {
-        isRowMatchingFilters,
-        filterModel: filterModel ?? getDefaultGridFilterModel(),
-      });
+      const filterState = apiRef.current.getFilterState(filterModel);
 
       const newState = {
         ...state,
         filter: {
           ...state.filter,
-          ...filteringResult,
+          ...filterState,
         },
       };
 
@@ -133,7 +125,7 @@ export const useGridFilter = (
       };
     });
     apiRef.current.publishEvent('filteredRowsSet');
-  }, [apiRef, props.filterMode, props.disableEval]);
+  }, [apiRef]);
 
   const addColumnMenuItem = React.useCallback<GridPipeProcessor<'columnMenu'>>(
     (columnMenuItems, colDef) => {
@@ -321,6 +313,25 @@ export const useGridFilter = (
     [apiRef, logger, props.disableMultipleColumnsFiltering],
   );
 
+  const getFilterState = React.useCallback<GridFilterApi['getFilterState']>(
+    (filterModel) => {
+      const isRowMatchingFilters =
+        props.filterMode === 'client'
+          ? buildAggregatedFilterApplier(filterModel, apiRef, props.disableEval)
+          : null;
+
+      const filterResult = apiRef.current.applyStrategyProcessor('filtering', {
+        isRowMatchingFilters,
+        filterModel: filterModel ?? getDefaultGridFilterModel(),
+      });
+      return {
+        ...filterResult,
+        filterModel,
+      };
+    },
+    [apiRef, props.filterMode, props.disableEval],
+  );
+
   const filterApi: GridFilterApi = {
     setFilterLogicOperator,
     unstable_applyFilters: applyFilters,
@@ -332,6 +343,7 @@ export const useGridFilter = (
     hideFilterPanel,
     setQuickFilterValues,
     ignoreDiacritics: props.ignoreDiacritics,
+    getFilterState,
   };
 
   useGridApiMethod(apiRef, filterApi, 'public');

packages/x-data-grid/src/models/api/gridFilterApi.ts

@@ -2,6 +2,7 @@ import { GridFilterModel } from '../gridFilterModel';
 import { GridFilterItem, GridLogicOperator } from '../gridFilterItem';
 import { GridControlledStateReasonLookup } from '../events';
 import type { DataGridProcessedProps } from '../props/DataGridProps';
+import { GridStateCommunity } from '../gridStateCommunity';
 
 /**
  * The filter API interface that is available in the grid [[apiRef]].
@@ -61,4 +62,10 @@ export interface GridFilterApi {
    * Returns the value of the `ignoreDiacritics` prop.
    */
   ignoreDiacritics: DataGridProcessedProps['ignoreDiacritics'];
+  /**
+   * Returns the filter state for the given filter model without applying it to the data grid.
+   * @param {GridFilterModel} filterModel The filter model to get the state for.
+   * @returns {GridStateCommunity['filter']} The filter state.
+   */
+  getFilterState: (filterModel: GridFilterModel) => GridStateCommunity['filter'];
 }