React Example: Basic External Atoms

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import React from 'react'
import ReactDOM from 'react-dom/client'
import './index.css'
import { useCreateAtom, useSelector } from '@tanstack/react-store'
import {
  createColumnHelper,
  createPaginatedRowModel,
  createSortedRowModel,
  rowPaginationFeature,
  rowSortingFeature,
  sortFns,
  tableFeatures,
  useTable,
} from '@tanstack/react-table'
import { makeData } from './makeData'
import type { PaginationState, SortingState } from '@tanstack/react-table'

type Person = {
  firstName: string
  lastName: string
  age: number
  visits: number
  status: string
  progress: number
}

const _features = tableFeatures({
  rowPaginationFeature,
  rowSortingFeature,
})

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

const columns = columnHelper.columns([
  columnHelper.accessor('firstName', {
    header: 'First Name',
    cell: (info) => info.getValue(),
  }),
  columnHelper.accessor('lastName', {
    header: 'Last Name',
    cell: (info) => info.getValue(),
  }),
  columnHelper.accessor('age', {
    header: 'Age',
  }),
  columnHelper.accessor('visits', {
    header: 'Visits',
  }),
  columnHelper.accessor('status', {
    header: 'Status',
  }),
  columnHelper.accessor('progress', {
    header: 'Profile Progress',
  }),
])

function App() {
  const [data, setData] = React.useState(() => makeData(1_000))
  const refreshData = () => setData(makeData(1_000))
  const stressTest = () => setData(makeData(100_000))

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

  // Create stable external atoms for the individual state slices you want to
  // own. The table still creates internal base atoms for everything else.
  const sortingAtom = useCreateAtom<SortingState>([])
  const paginationAtom = useCreateAtom<PaginationState>({
    pageIndex: 0,
    pageSize: 10,
  })

  // Subscribe to each atom independently — fine-grained reactivity.
  const sorting = useSelector(sortingAtom)
  const pagination = useSelector(paginationAtom)

  console.log('sorting', sorting)
  console.log('pagination', pagination)

  // Create the table and pass your per-slice external atoms.
  const table = useTable(
    {
      _features,
      _rowModels: {
        sortedRowModel: createSortedRowModel(sortFns),
        paginatedRowModel: createPaginatedRowModel(),
      },
      columns,
      data,
      atoms: {
        sorting: sortingAtom,
        pagination: paginationAtom,
      },
      debugTable: true,
    },
    (state) => state, // subscribe to all state changes for re-rendering
  )

  return (
    <div className="demo-root">
      <div>
        <button onClick={() => refreshData()} className="demo-button">
          Regenerate Data
        </button>
        <button onClick={() => stressTest()} className="demo-button">
          Stress Test (100k rows)
        </button>
      </div>
      <div className="spacer-md" />
      <table>
        <thead>
          {table.getHeaderGroups().map((headerGroup) => (
            <tr key={headerGroup.id}>
              {headerGroup.headers.map((header) => (
                <th key={header.id} colSpan={header.colSpan}>
                  {header.isPlaceholder ? null : (
                    <div
                      className={
                        header.column.getCanSort() ? 'sortable-header' : ''
                      }
                      onClick={header.column.getToggleSortingHandler()}
                    >
                      <table.FlexRender header={header} />
                      {{
                        asc: ' 🔼',
                        desc: ' 🔽',
                      }[header.column.getIsSorted() as string] ?? null}
                    </div>
                  )}
                </th>
              ))}
            </tr>
          ))}
        </thead>
        <tbody>
          {table.getRowModel().rows.map((row) => (
            <tr key={row.id}>
              {row.getAllCells().map((cell) => (
                <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.atoms.pagination.get().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.atoms.pagination.get().pageIndex + 1}
            onChange={(e) => {
              const page = e.target.value ? Number(e.target.value) - 1 : 0
              table.setPageIndex(page)
            }}
            className="page-size-input"
          />
        </span>
        <select
          value={table.atoms.pagination.get().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 className="spacer-md" />
      <button onClick={() => rerender()} className="demo-button">
        Rerender
      </button>
      <pre>
        {JSON.stringify(
          {
            sorting: table.atoms.sorting.get(),
            pagination: table.atoms.pagination.get(),
          },
          null,
          2,
        )}
      </pre>
    </div>
  )
}

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>,
)

import React from 'react'
import ReactDOM from 'react-dom/client'
import './index.css'
import { useCreateAtom, useSelector } from '@tanstack/react-store'
import {
  createColumnHelper,
  createPaginatedRowModel,
  createSortedRowModel,
  rowPaginationFeature,
  rowSortingFeature,
  sortFns,
  tableFeatures,
  useTable,
} from '@tanstack/react-table'
import { makeData } from './makeData'
import type { PaginationState, SortingState } from '@tanstack/react-table'

type Person = {
  firstName: string
  lastName: string
  age: number
  visits: number
  status: string
  progress: number
}

const _features = tableFeatures({
  rowPaginationFeature,
  rowSortingFeature,
})

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

const columns = columnHelper.columns([
  columnHelper.accessor('firstName', {
    header: 'First Name',
    cell: (info) => info.getValue(),
  }),
  columnHelper.accessor('lastName', {
    header: 'Last Name',
    cell: (info) => info.getValue(),
  }),
  columnHelper.accessor('age', {
    header: 'Age',
  }),
  columnHelper.accessor('visits', {
    header: 'Visits',
  }),
  columnHelper.accessor('status', {
    header: 'Status',
  }),
  columnHelper.accessor('progress', {
    header: 'Profile Progress',
  }),
])

function App() {
  const [data, setData] = React.useState(() => makeData(1_000))
  const refreshData = () => setData(makeData(1_000))
  const stressTest = () => setData(makeData(100_000))

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

  // Create stable external atoms for the individual state slices you want to
  // own. The table still creates internal base atoms for everything else.
  const sortingAtom = useCreateAtom<SortingState>([])
  const paginationAtom = useCreateAtom<PaginationState>({
    pageIndex: 0,
    pageSize: 10,
  })

  // Subscribe to each atom independently — fine-grained reactivity.
  const sorting = useSelector(sortingAtom)
  const pagination = useSelector(paginationAtom)

  console.log('sorting', sorting)
  console.log('pagination', pagination)

  // Create the table and pass your per-slice external atoms.
  const table = useTable(
    {
      _features,
      _rowModels: {
        sortedRowModel: createSortedRowModel(sortFns),
        paginatedRowModel: createPaginatedRowModel(),
      },
      columns,
      data,
      atoms: {
        sorting: sortingAtom,
        pagination: paginationAtom,
      },
      debugTable: true,
    },
    (state) => state, // subscribe to all state changes for re-rendering
  )

  return (
    <div className="demo-root">
      <div>
        <button onClick={() => refreshData()} className="demo-button">
          Regenerate Data
        </button>
        <button onClick={() => stressTest()} className="demo-button">
          Stress Test (100k rows)
        </button>
      </div>
      <div className="spacer-md" />
      <table>
        <thead>
          {table.getHeaderGroups().map((headerGroup) => (
            <tr key={headerGroup.id}>
              {headerGroup.headers.map((header) => (
                <th key={header.id} colSpan={header.colSpan}>
                  {header.isPlaceholder ? null : (
                    <div
                      className={
                        header.column.getCanSort() ? 'sortable-header' : ''
                      }
                      onClick={header.column.getToggleSortingHandler()}
                    >
                      <table.FlexRender header={header} />
                      {{
                        asc: ' 🔼',
                        desc: ' 🔽',
                      }[header.column.getIsSorted() as string] ?? null}
                    </div>
                  )}
                </th>
              ))}
            </tr>
          ))}
        </thead>
        <tbody>
          {table.getRowModel().rows.map((row) => (
            <tr key={row.id}>
              {row.getAllCells().map((cell) => (
                <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.atoms.pagination.get().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.atoms.pagination.get().pageIndex + 1}
            onChange={(e) => {
              const page = e.target.value ? Number(e.target.value) - 1 : 0
              table.setPageIndex(page)
            }}
            className="page-size-input"
          />
        </span>
        <select
          value={table.atoms.pagination.get().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 className="spacer-md" />
      <button onClick={() => rerender()} className="demo-button">
        Rerender
      </button>
      <pre>
        {JSON.stringify(
          {
            sorting: table.atoms.sorting.get(),
            pagination: table.atoms.pagination.get(),
          },
          null,
          2,
        )}
      </pre>
    </div>
  )
}

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>,
)