feat: add filterTooltipValueFn option to transform the value of the filter tooltip

apps/mantine-react-table-docs/components/prop-tables/columnOptions.ts

@@ -307,6 +307,17 @@ export const columnOptions: ColumnOption[] = [
     required: false,
     type: 'MRT_FilterFn',
   },
+  {
+    columnOption: 'filterTooltipValueFn',
+    defaultValue: '',
+    description:
+      'Specify to transform tooltip values to a readable format.',
+    link: '',
+    linkText: '',
+    source: 'MRT',
+    required: false,
+    type: "(value: any) => string",    
+  },
   {
     columnOption: 'filterVariant',
     defaultValue: "'text'",

packages/mantine-react-table/src/components/head/MRT_TableHeadCellFilterLabel.tsx

@@ -53,6 +53,8 @@ export const MRT_TableHeadCellFilterLabel = <TData extends MRT_RowData>({
       columnDef._filterFn,
     );
   const currentFilterOption = columnDef._filterFn;
+  const filterValueFn =
+    columnDef.filterTooltipValueFn || ((value: any) => value as string);
   const filterTooltip =
     columnFilterDisplayMode === 'popover' && !isFilterActive
       ? localization.filterByColumn?.replace(
@@ -69,10 +71,12 @@ export const MRT_TableHeadCellFilterLabel = <TData extends MRT_RowData>({
             '{filterValue}',
             `"${
               Array.isArray(column.getFilterValue())
-                ? (column.getFilterValue() as [string, string]).join(
+                ? (column.getFilterValue() as [])
+                  .map((v) => filterValueFn(v))
+                  .join(
                     `" ${isRangeFilter ? localization.and : localization.or} "`,
                   )
-                : (column.getFilterValue() as string)
+              : filterValueFn(column.getFilterValue())
             }"`,
           )
           .replace('" "', '');

packages/mantine-react-table/src/types.ts

@@ -500,6 +500,7 @@ export type MRT_ColumnDef<TData extends MRT_RowData, TValue = unknown> = Omit<
   enableEditing?: ((row: MRT_Row<TData>) => boolean) | boolean;
   enableFilterMatchHighlighting?: boolean;
   filterFn?: MRT_FilterFn<TData>;
+  filterTooltipValueFn?: (value: any) => string,
   filterVariant?:
     | 'autocomplete'
     | 'checkbox'

packages/mantine-react-table/stories/features/Filtering.stories.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useState } from 'react';
-import { Button, Flex } from '@mantine/core';
+import { Button, Checkbox, Flex, Group, SegmentedControl } from '@mantine/core';
 import {
   type MRT_ColumnDef,
   type MRT_ColumnFiltersState,
@@ -8,6 +8,17 @@ import {
 import { faker } from '@faker-js/faker';
 import { type Meta } from '@storybook/react';
 
+import { MRT_Localization_EN } from '../../src/locales/en';
+import { MRT_Localization_JA } from '../../src/locales/ja';
+
+import dayjs from 'dayjs';
+import isBetween from 'dayjs/plugin/isBetween';
+import localizedFormat from 'dayjs/plugin/localizedFormat';
+dayjs.extend(isBetween);
+dayjs.extend(localizedFormat);
+import Dayjs_EN from 'dayjs/locale/en';
+import Dayjs_JA from 'dayjs/locale/ja';
+
 const meta: Meta = {
   title: 'Features/Filtering Examples',
 };
@@ -730,3 +741,120 @@ export const ExternalSetFilterValue = () => (
     )}
   />
 );
+
+export const CustomTooltipValueFn = () => {
+  const [localization, setLocalization] = useState(MRT_Localization_EN);
+  const [locale, setLocale] = useState<string | undefined>('en');
+  const [columnFilters, setColumnFilters] = useState<MRT_ColumnFiltersState>(
+    [],
+  );
+  const [isActiveValueFn, setIsActiveValueFn] = useState<any>(undefined);
+  const [dateValueFn, setDateValueFn] = useState<any>(undefined);
+  const [enableValueFns, setEnableValueFns] = useState(true);
+
+  const formatDate = (date: any, format: string) => {
+    const d = dayjs(date || '');
+    return d.isValid() ? d.format(format) : '';
+  };
+  const formatIsActiveValue = () => (value: any) =>
+    value === 'true' ? 'Yes' : 'No';
+  const formatDateValue = () => (value: any) => formatDate(value, 'L');
+
+  useEffect(() => {
+    switch (locale) {
+      case 'en':
+        setLocalization(MRT_Localization_EN);
+        dayjs.locale(Dayjs_EN);
+        break;
+      case 'ja':
+        setLocalization(MRT_Localization_JA);
+        dayjs.locale(Dayjs_JA);
+        break;
+    }
+  }, [locale]);
+
+  useEffect(() => {
+    if (enableValueFns) {
+      setIsActiveValueFn(formatIsActiveValue);
+      setDateValueFn(formatDateValue);
+    } else {
+      setIsActiveValueFn(undefined);
+      setDateValueFn(undefined);
+    }
+  }, [enableValueFns]);
+
+  return (
+    <>
+      <MantineReactTable
+        renderTopToolbarCustomActions={() => (
+          <Group>
+            <Checkbox
+              label="Enable Custom Tooltip Value Fn"
+              checked={enableValueFns}
+              onChange={(event) =>
+                setEnableValueFns(event.currentTarget.checked)
+              }
+            />
+            <SegmentedControl
+              data={['en', 'ja']}
+              value={locale}
+              onChange={setLocale}
+            />
+          </Group>
+        )}
+        localization={localization}
+        columns={[
+          {
+            Cell: ({ cell }) => (cell.getValue() === 'true' ? 'Yes' : 'No'),
+            accessorFn: (originalRow) =>
+              originalRow.isActive ? 'true' : 'false',
+            filterVariant: 'checkbox',
+            filterTooltipValueFn: isActiveValueFn, //transform data to readable format for tooltip
+            header: 'Is Active',
+            id: 'isActive',
+            size: 200,
+          },
+          {
+            accessorKey: 'firstName',
+            header: 'First Name',
+          },
+          {
+            accessorKey: 'lastName',
+            header: 'Last Name',
+          },
+          {
+            Cell: ({ cell }) => formatDate(cell.getValue<Date>(), 'L'), //transform data to readable format for cell render
+            mantineFilterDateInputProps: {
+              locale: locale,
+              valueFormat: 'L',
+            },
+            accessorFn: (row) => new Date(row.birthDate), //transform data before processing so sorting works
+            accessorKey: 'birthDate',
+            filterVariant: 'date',
+            filterTooltipValueFn: dateValueFn, //transform data to readable format for tooltip
+            header: 'Birth Date (date)',
+            sortingFn: 'datetime',
+          },
+          {
+            Cell: ({ cell }) => formatDate(cell.getValue<Date>(), 'L'), //transform data to readable format for cell render
+            mantineFilterDateInputProps: {
+              locale: locale,
+              valueFormat: 'L',
+            },
+            accessorFn: (row) => new Date(row.birthDate), //transform data before processing so sorting works
+            accessorKey: 'birthDateRange',
+            filterVariant: 'date-range',
+            filterTooltipValueFn: dateValueFn, //transform data to readable format for tooltip
+            header: 'Birth Date (date-range)',
+            sortingFn: 'datetime',
+          },
+        ]}
+        data={data}
+        onColumnFiltersChange={setColumnFilters}
+        state={{
+          columnFilters,
+        }}
+      />
+    </>
+  );
+};