Preact Example: Expanding

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import { useEffect, useMemo, useReducer, useRef, useState } from 'preact/hooks'
import { render } from 'preact'
import {
  columnFilteringFeature,
  createColumnHelper,
  createExpandedRowModel,
  createFilteredRowModel,
  createPaginatedRowModel,
  createSortedRowModel,
  filterFns,
  rowExpandingFeature,
  rowPaginationFeature,
  rowSelectionFeature,
  rowSortingFeature,
  sortFns,
  tableFeatures,
  useTable,
} from '@tanstack/preact-table'
import { makeData } from './makeData'
import type { JSX } from 'preact'
import type { Person } from './makeData'
import type { Column, Table } from '@tanstack/preact-table'
import './index.css'

const features = tableFeatures({
  columnFilteringFeature,
  rowExpandingFeature,
  rowPaginationFeature,
  rowSortingFeature,
  rowSelectionFeature,
  expandedRowModel: createExpandedRowModel(),
  filteredRowModel: createFilteredRowModel(),
  paginatedRowModel: createPaginatedRowModel(),
  sortedRowModel: createSortedRowModel(),
  filterFns,
  sortFns,
})

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

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

  const columns = 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] = useState(() => makeData(100, 5, 3))
  const refreshData = () => setData(() => makeData(100, 5, 3))
  const stressTest = () => setData(() => makeData(10_000, 5, 3))

  const table = useTable(
    {
      features,
      columns,
      data,
      getSubRows: (row) => row.subRows,
      // filterFromLeafRows: true,
      // maxLeafRowFilterDepth: 0,
      debugTable: true,
    },
    (state) => state, // default selector
  )

  return (
    <div className="demo-root">
      <div>
        <button onClick={() => refreshData()}>Regenerate Data</button>
        <button onClick={() => stressTest()}>Stress Test (10k rows)</button>
      </div>
      <div className="spacer-sm" />
      <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="spacer-sm" />
      <div className="controls">
        <button
          className="demo-button demo-button-sm"
          onClick={() => table.setPageIndex(0)}
          disabled={!table.getCanPreviousPage()}
        >
          {'<<'}
        </button>
        <button
          className="demo-button demo-button-sm"
          onClick={() => table.previousPage()}
          disabled={!table.getCanPreviousPage()}
        >
          {'<'}
        </button>
        <button
          className="demo-button demo-button-sm"
          onClick={() => table.nextPage()}
          disabled={!table.getCanNextPage()}
        >
          {'>'}
        </button>
        <button
          className="demo-button demo-button-sm"
          onClick={() => table.setPageIndex(table.getPageCount() - 1)}
          disabled={!table.getCanNextPage()}
        >
          {'>>'}
        </button>
        <span className="inline-controls">
          <div>Page</div>
          <strong>
            {(table.state.pagination.pageIndex + 1).toLocaleString()} of{' '}
            {table.getPageCount().toLocaleString()}
          </strong>
        </span>
        <span className="inline-controls">
          | Go to page:
          <input
            type="number"
            min="1"
            max={table.getPageCount()}
            defaultValue={table.state.pagination.pageIndex + 1}
            onChange={(e) => {
              const page = (e.target as HTMLInputElement).value
                ? Number((e.target as HTMLInputElement).value) - 1
                : 0
              table.setPageIndex(page)
            }}
            className="page-size-input"
          />
        </span>
        <select
          value={table.state.pagination.pageSize}
          onChange={(e) => {
            table.setPageSize(Number((e.target as HTMLSelectElement).value))
          }}
        >
          {[10, 20, 30, 40, 50].map((pageSize) => (
            <option key={pageSize} value={pageSize}>
              Show {pageSize}
            </option>
          ))}
        </select>
      </div>
      <div>{table.getRowModel().rows.length.toLocaleString()} Rows</div>
      <div>
        <button onClick={() => rerender(0)}>Force Rerender</button>
      </div>
      <pre>{JSON.stringify(table.state, null, 2)}</pre>
    </div>
  )
}

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="filter-row">
      <input
        type="number"
        value={(columnFilterValue as [number, number] | undefined)?.[0]}
        onInput={(e) =>
          column.setFilterValue((old: [number, number] | undefined) => [
            (e.target as HTMLInputElement).value,
            old?.[1],
          ])
        }
        placeholder={`Min`}
        className="filter-input"
      />
      <input
        type="number"
        value={(columnFilterValue as [number, number] | undefined)?.[1]}
        onInput={(e) =>
          column.setFilterValue((old: [number, number] | undefined) => [
            old?.[0],
            (e.target as HTMLInputElement).value,
          ])
        }
        placeholder={`Max`}
        className="filter-input"
      />
    </div>
  ) : (
    <input
      type="text"
      value={(columnFilterValue ?? '') as string}
      onInput={(e) =>
        column.setFilterValue((e.target as HTMLInputElement).value)
      }
      placeholder={`Search...`}
      className="filter-select"
    />
  )
}

function IndeterminateCheckbox({
  indeterminate,
  className = '',
  checked,
  onChange,
  ...rest
}: {
  indeterminate?: boolean
  checked?: boolean
  onChange?: (event: Event) => void
} & Omit<JSX.HTMLAttributes<HTMLInputElement>, 'checked' | 'onChange'>) {
  const ref = useRef<HTMLInputElement | null>(null)

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

  return (
    <input
      type="checkbox"
      ref={ref}
      className={className + ' sortable-header'}
      checked={checked}
      onChange={onChange}
      {...rest}
    />
  )
}

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

render(<App />, rootElement)