React Example: Expanding

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import React from 'react'
import ReactDOM from 'react-dom/client'
import {
  columnFilteringFeature,
  createColumnHelper,
  createExpandedRowModel,
  createFilteredRowModel,
  createPaginatedRowModel,
  createSortedRowModel,
  filterFns,
  rowExpandingFeature,
  rowPaginationFeature,
  rowSelectionFeature,
  rowSortingFeature,
  sortFns,
  tableFeatures,
  useTable,
} from '@tanstack/react-table'
import { makeData } from './makeData'
import type { HTMLProps } from 'react'
import type { Person } from './makeData'
import type { Column, Table } from '@tanstack/react-table'
import './index.css'

const _features = tableFeatures({
  columnFilteringFeature,
  rowExpandingFeature,
  rowPaginationFeature,
  rowSortingFeature,
  rowSelectionFeature,
})

const columnHelper = createColumnHelper<typeof _features, Person>()

function App() {
  const rerender = React.useReducer(() => ({}), {})[1]

  const columns = React.useMemo(
    () =>
      columnHelper.columns([
        columnHelper.accessor('firstName', {
          header: ({ table }) => (
            <>
              <IndeterminateCheckbox
                checked={table.getIsAllRowsSelected()}
                indeterminate={table.getIsSomeRowsSelected()}
                onChange={table.getToggleAllRowsSelectedHandler()}
              />{' '}
              <button onClick={table.getToggleAllRowsExpandedHandler()}>
                {table.getIsAllRowsExpanded() ? '👇' : '👉'}
              </button>{' '}
              First Name
            </>
          ),
          cell: ({ row, getValue }) => (
            <div
              style={{
                // Since rows are flattened by default,
                // we can use the row.depth property
                // and paddingLeft to visually indicate the depth
                // of the row
                paddingLeft: `${row.depth * 2}rem`,
              }}
            >
              <div>
                <IndeterminateCheckbox
                  checked={row.getIsSelected()}
                  indeterminate={row.getIsSomeSelected()}
                  onChange={row.getToggleSelectedHandler()}
                />{' '}
                {row.getCanExpand() ? (
                  <button
                    onClick={row.getToggleExpandedHandler()}
                    style={{ cursor: 'pointer' }}
                  >
                    {row.getIsExpanded() ? '👇' : '👉'}
                  </button>
                ) : (
                  '🔵'
                )}{' '}
                {getValue<boolean>()}
              </div>
            </div>
          ),
          footer: (props) => props.column.id,
        }),
        columnHelper.accessor((row) => row.lastName, {
          id: 'lastName',
          cell: (info) => info.getValue(),
          header: () => <span>Last Name</span>,
          footer: (props) => props.column.id,
        }),
        columnHelper.accessor('age', {
          header: () => 'Age',
          footer: (props) => props.column.id,
          filterFn: 'between',
        }),
        columnHelper.accessor('visits', {
          header: () => <span>Visits</span>,
          footer: (props) => props.column.id,
        }),
        columnHelper.accessor('status', {
          header: 'Status',
          footer: (props) => props.column.id,
        }),
        columnHelper.accessor('progress', {
          header: 'Profile Progress',
          footer: (props) => props.column.id,
        }),
      ]),
    [],
  )

  const [data, setData] = React.useState(() => makeData(100, 5, 3))
  const refreshData = () => setData(() => makeData(100, 5, 3))

  const table = useTable({
    _features,
    _rowModels: {
      expandedRowModel: createExpandedRowModel(),
      filteredRowModel: createFilteredRowModel(filterFns),
      paginatedRowModel: createPaginatedRowModel(),
      sortedRowModel: createSortedRowModel(sortFns),
    },
    columns,
    data,
    getSubRows: (row) => row.subRows,
    // filterFromLeafRows: true,
    // maxLeafRowFilterDepth: 0,
    debugTable: true,
  })

  return (
    <table.Subscribe
      selector={(state) => ({
        expanded: state.expanded,
        pagination: state.pagination,
      })}
    >
      {(state) => (
        <div className="p-2">
          <div className="h-2" />
          <table>
            <thead>
              {table.getHeaderGroups().map((headerGroup) => (
                <tr key={headerGroup.id}>
                  {headerGroup.headers.map((header) => {
                    return (
                      <th key={header.id} colSpan={header.colSpan}>
                        {header.isPlaceholder ? null : (
                          <div>
                            <table.FlexRender header={header} />
                            {header.column.getCanFilter() ? (
                              <div>
                                <Filter column={header.column} table={table} />
                              </div>
                            ) : null}
                          </div>
                        )}
                      </th>
                    )
                  })}
                </tr>
              ))}
            </thead>
            <tbody>
              {table.getRowModel().rows.map((row) => {
                return (
                  <tr key={row.id}>
                    {row.getAllCells().map((cell) => {
                      return (
                        <td key={cell.id}>
                          <table.FlexRender cell={cell} />
                        </td>
                      )
                    })}
                  </tr>
                )
              })}
            </tbody>
          </table>
          <div className="h-2" />
          <div className="flex items-center gap-2">
            <button
              className="border rounded p-1"
              onClick={() => table.setPageIndex(0)}
              disabled={!table.getCanPreviousPage()}
            >
              {'<<'}
            </button>
            <button
              className="border rounded p-1"
              onClick={() => table.previousPage()}
              disabled={!table.getCanPreviousPage()}
            >
              {'<'}
            </button>
            <button
              className="border rounded p-1"
              onClick={() => table.nextPage()}
              disabled={!table.getCanNextPage()}
            >
              {'>'}
            </button>
            <button
              className="border rounded p-1"
              onClick={() => table.setPageIndex(table.getPageCount() - 1)}
              disabled={!table.getCanNextPage()}
            >
              {'>>'}
            </button>
            <span className="flex items-center gap-1">
              <div>Page</div>
              <strong>
                {state.pagination.pageIndex + 1} of {table.getPageCount()}
              </strong>
            </span>
            <span className="flex items-center gap-1">
              | Go to page:
              <input
                type="number"
                min="1"
                max={table.getPageCount()}
                defaultValue={state.pagination.pageIndex + 1}
                onChange={(e) => {
                  const page = e.target.value ? Number(e.target.value) - 1 : 0
                  table.setPageIndex(page)
                }}
                className="border p-1 rounded w-16"
              />
            </span>
            <select
              value={state.pagination.pageSize}
              onChange={(e) => {
                table.setPageSize(Number(e.target.value))
              }}
            >
              {[10, 20, 30, 40, 50].map((pageSize) => (
                <option key={pageSize} value={pageSize}>
                  Show {pageSize}
                </option>
              ))}
            </select>
          </div>
          <div>{table.getRowModel().rows.length} Rows</div>
          <div>
            <button onClick={() => rerender()}>Force Rerender</button>
          </div>
          <div>
            <button onClick={() => refreshData()}>Refresh Data</button>
          </div>
          <table.Subscribe selector={(state) => state}>
            {(state) => <pre>{JSON.stringify(state, null, 2)}</pre>}
          </table.Subscribe>
        </div>
      )}
    </table.Subscribe>
  )
}

function Filter({
  column,
  table,
}: {
  column: Column<typeof _features, Person>
  table: Table<typeof _features, Person>
}) {
  const firstValue = table
    .getPreFilteredRowModel()
    .flatRows[0]?.getValue(column.id)

  const columnFilterValue = column.getFilterValue()

  return typeof firstValue === 'number' ? (
    <div className="flex space-x-2">
      <input
        type="number"
        value={(columnFilterValue as [number, number] | undefined)?.[0]}
        onChange={(e) =>
          column.setFilterValue((old: [number, number] | undefined) => [
            e.target.value,
            old?.[1],
          ])
        }
        placeholder={`Min`}
        className="w-24 border shadow rounded"
      />
      <input
        type="number"
        value={(columnFilterValue as [number, number] | undefined)?.[1]}
        onChange={(e) =>
          column.setFilterValue((old: [number, number] | undefined) => [
            old?.[0],
            e.target.value,
          ])
        }
        placeholder={`Max`}
        className="w-24 border shadow rounded"
      />
    </div>
  ) : (
    <input
      type="text"
      value={(columnFilterValue ?? '') as string}
      onChange={(e) => column.setFilterValue(e.target.value)}
      placeholder={`Search...`}
      className="w-36 border shadow rounded"
    />
  )
}

function IndeterminateCheckbox({
  indeterminate,
  className = '',
  ...rest
}: { indeterminate?: boolean } & HTMLProps<HTMLInputElement>) {
  const ref = React.useRef<HTMLInputElement>(null!)

  React.useEffect(() => {
    if (typeof indeterminate === 'boolean') {
      ref.current.indeterminate = !rest.checked && indeterminate
    }
  }, [ref, indeterminate])

  return (
    <input
      type="checkbox"
      ref={ref}
      className={className + ' cursor-pointer'}
      {...rest}
    />
  )
}

const rootElement = document.getElementById('root')
if (!rootElement) throw new Error('Failed to find the root element')

ReactDOM.createRoot(rootElement).render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
)