Material React Table

Material React Table has built-in grouping and aggregation features. There are options for both automatic client-side grouping and aggregation, as well as manual server-side grouping and aggregation. This guide will walk you through the different options and how to use and customize them.

Record<string, AggregationFn>

boolean

true

boolean

boolean

(({ cell, column, row, table }) => ReactNode)

ReactNode | (({ column, footer, table }) => ReactNode)

(({ cell, column, row, table }) => ReactNode)

boolean

Record<string, boolean> | boolean

{}

Array<string>

[]

To enable grouping, set the enableGrouping prop to true. This will both add a drag handle button so columns can be dragged to the dropzone to be grouped, and will add an entry column actions menu to group or ungroup a column.

<MaterialReactTable columns={columns} data={data} enableGrouping />

const columns = [
  {
    accessorKey: 'name',
    header: 'Name',
    enableGrouping: false, // disable grouping for this column
  },
  {
    accessorKey: 'age',
    header: 'Age',
  },
];

return <MaterialReactTable columns={columns} data={data} enableGrouping />;

If you don't want the drag buttons that come with the grouping feature, you can independently disable them without disabling the grouping feature entirely by setting the enableColumnDragging prop to false.

<MaterialReactTable
  columns={columns}
  data={data}
  enableGrouping
  enableColumnDragging={false} //don't show drag handle buttons, but still show grouping options in column actions menu
/>

If you want columns to be grouped by default, you can set the grouping state in either the initialState or state prop.

<MaterialReactTable
  columns={columns}
  data={data}
  enableGrouping
  initialState={{ grouping: ['location', 'department'] }} //group by location and department by default
/>

In addition to grouping columns by default, you may also want those grouped rows to be expanded and visible by default too. You can do this by setting the expanded state to true in either the initialState or state prop.

<MaterialReactTable
  columns={columns}
  data={data}
  enableGrouping
  initialState={{
    grouping: ['location', 'department'], //group by location and department by default and expand grouped rows
    expanded: true, //show grouped rows by default
  }}
/>

One of the cool features of Material React Table is that it can automatically aggregate the data in grouped rows. To enable this, you must specify both an aggregationFn and an AggregatedCell render option on a column definition.

There are several built-in aggregation functions available that you can use. They are:

• count - Finds the number of rows in a group

• extent - Finds the minimum and maximum values of a group of rows

• max - Finds the maximum value of a group of rows

• mean - Finds the average value of a group of rows

• median - Finds the median value of a group of rows

• min - Finds the minimum value of a group of rows

• sum - sums the values of a group of rows

• uniqueCount - Finds the number of unique values of a group of rows

• unique - Finds the unique values of a group of rows

All of these built-in aggregation functions are from TanStack Table

const columns = [
  {
    accessorKey: 'team', //grouped by team in initial state below
    header: 'Team',
  },
  {
    accessorKey: 'player',
    header: 'Player',
  },
  {
    accessorKey: 'points',
    header: 'Points',
    aggregationFn: 'sum', //calc total points for each team by adding up all the points for each player on the team
    AggregatedCell: ({ cell }) => <div>Team Score: {cell.getValue()}</div>,
  },
];

return (
  <MaterialReactTable
    columns={columns}
    data={data}
    enableGrouping
    initialState={{ grouping: ['team'], expanded: true }}
  />
);

If none of those pre-built aggregation functions work for you, you can also pass in a custom aggregation function. The aggregation function will be passed an array of values from the column that you are aggregating. It should return a single value that will be displayed in the aggregated cell.

If you are specifying a custom aggregation function, it must implement the following type:

export type AggregationFn<TData extends AnyData> = (
  getLeafRows: () => Row<TData>[],
  getChildRows: () => Row<TData>[]
) => any

Material React Table does not automatically aggregate all rows for you to calculate totals for the entire table. However, it is still easy enough to do this manually and add in your custom calculations into the footer or Footer of a column definition. It is recommended that you do any necessary aggregation calculations on your data in a useMemo hook before passing it to the columns footer in your columns definition.

//calculate the total points for all players in the table in a useMemo hook
const averageScore = useMemo(() => {
  const totalPoints = data.reduce((acc, row) => acc + row.points, 0);
  const totalPlayers = data.length;
  return totalPoints / totalPlayers;
}, [data]);

const columns = [
  {
    accessorKey: 'name',
    header: 'Name',
  },
  {
    accessorKey: 'score',
    header: 'Score',
    Footer: () => <div>Average Score: {averageScore}</div>, //don't do calculations in render, do them in useMemo hook and pass them in here
  },
];

Please remember to perform heavy aggregation calculations in a useMemo hook to avoid unnecessary re-renders!

There are a few custom cell render overrides that you should be aware of when using grouping and aggregation features.

"Aggregation Cells" are cells in an aggregated row (not a normal data row) that can display aggregates (avg, sum, etc) of the data in a group. The cell that the table is grouped on, however, is not an Aggregate Cell, but rather a GroupedCell.

You can specify the custom render for these cells with the AggregatedCell render option on a column definition.

const columns = [
  {
    accessorKey: 'points',
    header: 'Points',
    aggregationFn: 'sum',
    AggregatedCell: ({ cell }) => <div>Total Score: {cell.getValue()}</div>,
  },
];

"Grouped Cells" are cells in a grouped row (not a normal data row) that by default display the value that the rows are grouped on, and the number of rows in the group. You can override the default render for these cells with the GroupedCell render option on a column definition.

const columns = [
  {
    accessorKey: 'team',
    header: 'Team',
    GroupedCell: ({ cell }) => <div>Team: {cell.getValue()}</div>,
  },
];

1import React, { FC, useMemo } from 'react';
2import { Box, Stack } from '@mui/material';
3import MaterialReactTable, { MRT_ColumnDef } from 'material-react-table';
4import { data, Person } from './makeData';
5
6const Example: FC = () => {
7  const averageSalary = useMemo(
8    () => data.reduce((acc, curr) => acc + curr.salary, 0) / data.length,
9    [],
10  );
11
12  const maxAge = useMemo(
13    () => data.reduce((acc, curr) => Math.max(acc, curr.age), 0),
14    [],
15  );
16
17  const columns = useMemo<MRT_ColumnDef<Person>[]>(
18    () => [
19      {
20        header: 'First Name',
21        accessorKey: 'firstName',
22        enableGrouping: false, //don't let this column be grouped
23      },
24      {
25        header: 'Last Name',
26        accessorKey: 'lastName',
27      },
28      {
29        header: 'Age',
30        accessorKey: 'age',
31        aggregationFn: 'max', //show the max age in the group (lots of pre-built aggregationFns to choose from)
32        //required to render an aggregated cell
33        AggregatedCell: ({ cell, table }) => (
34          <>
35            Oldest by{' '}
36            {table.getColumn(cell.row.groupingColumnId ?? '').columnDef.header}:{' '}
37            <Box
38              sx={{ color: 'info.main', display: 'inline', fontWeight: 'bold' }}
39            >
40              {cell.getValue<number>()}
41            </Box>
42          </>
43        ),
44        Footer: () => (
45          <Stack>
46            Max Age:
47            <Box color="warning.main">{Math.round(maxAge)}</Box>
48          </Stack>
49        ),
50      },
51      {
52        header: 'Gender',
53        accessorKey: 'gender',
54        //optionally, customize the cell render when this column is grouped. Make the text blue and pluralize the word
55        GroupedCell: ({ cell, row }) => (
56          <Box sx={{ color: 'primary.main' }}>
57            <strong>{cell.getValue<string>()}s </strong> ({row.subRows?.length})
58          </Box>
59        ),
60      },
61      {
62        header: 'State',
63        accessorKey: 'state',
64      },
65      {
66        header: 'Salary',
67        accessorKey: 'salary',
68        aggregationFn: 'mean',
69        //required to render an aggregated cell, show the average salary in the group
70        AggregatedCell: ({ cell, table }) => (
71          <>
72            Average by{' '}
73            {table.getColumn(cell.row.groupingColumnId ?? '').columnDef.header}:{' '}
74            <Box sx={{ color: 'success.main', fontWeight: 'bold' }}>
75              {cell.getValue<number>()?.toLocaleString?.('en-US', {
76                style: 'currency',
77                currency: 'USD',
78                minimumFractionDigits: 0,
79                maximumFractionDigits: 0,
80              })}
81            </Box>
82          </>
83        ),
84        //customize normal cell render on normal non-aggregated rows
85        Cell: ({ cell }) => (
86          <>
87            {cell.getValue<number>()?.toLocaleString?.('en-US', {
88              style: 'currency',
89              currency: 'USD',
90              minimumFractionDigits: 0,
91              maximumFractionDigits: 0,
92            })}
93          </>
94        ),
95        Footer: () => (
96          <Stack>
97            Average Salary:
98            <Box color="warning.main">
99              {averageSalary?.toLocaleString?.('en-US', {
100                style: 'currency',
101                currency: 'USD',
102                minimumFractionDigits: 0,
103                maximumFractionDigits: 0,
104              })}
105            </Box>
106          </Stack>
107        ),
108      },
109    ],
110    [averageSalary, maxAge],
111  );
112
113  return (
114    <MaterialReactTable
115      columns={columns}
116      data={data}
117      enableGrouping
118      enableStickyHeader
119      enableStickyFooter
120      initialState={{
121        density: 'compact',
122        expanded: true, //expand all groups by default
123        grouping: ['state'], //an array of columns to group by by default (can be multiple)
124        pagination: { pageIndex: 0, pageSize: 20 },
125        sorting: [{ id: 'state', desc: false }], //sort by state by default
126      }}
127      muiToolbarAlertBannerChipProps={{ color: 'primary' }}
128      muiTableContainerProps={{ sx: { maxHeight: 700 } }}
129    />
130  );
131};
132
133export default Example;
134

TODO