docs.sheetjs.com/docz/docs/03-demos/02-grid/17-gdg.md

---
title: Glide Datagrid
pagination_prev: demos/frontend/index
pagination_next: demos/net/index
---

:::note

This demo was last tested on 2023 February 07 with the ViteJS+React+TypeScript
starter (Vite `4.1.1`, React `18.2.0`) and `@glideapps/glide-data-grid@5.2.1`.

:::

## Integration Details

#### Backing Store

Under the hood, the `DataEditor` component is designed to call methods and
request data to display in the grid. It is typical to store data *outside* of
component state.  A `getCellContent` callback will pull data from the external
backing store, while SheetJS operations will directly act on the store:

```js
// !! THESE OBJECTS ARE DEFINED OUTSIDE OF THE COMPONENT FUNCTION !!

// this will store the raw data objects
let data: any[] = [];
// this will store the header names
let header: string[] = [];
```

#### Props

:::note

This is a high-level overview. The official documentation should be consulted.

:::

_Columns_

`DataEditor` expects column metadata to be passed through a `columns` prop. This
should be managed in the component state:

```js
import { useState } from 'react';
import { DataEditor, GridColumn } from '@glideapps/glide-data-grid';

function App() {
  // highlight-next-line
  const [cols, setCols] = useState<GridColumn[]>([]); // gdg column objects
  // ...
  return ( <>
    // ...
    <DataEditor
      // ... props
      // highlight-next-line
      columns={cols}
    />
    // ...
  </> );
}
export default App;
```

Each `GridColumn` object expects a `title` representing the display name and an
`id` representing the key to index within the data object.

_Data_

The `DataEditor` component expects a `getCellContent` callback for supplying
data. The callback accepts column and row indices.  The column index should be
used to find the header key:

```js
import { useCallback } from 'react';
import { DataEditor, GridCellKind, GridCell, Item } from '@glideapps/glide-data-grid';

// ...

function App() {
  // ...
  // backing data store -> gdg
  // highlight-start
  const getContent = useCallback((cell: Item): GridCell => {
    const [col, row] = cell;
    return {
      kind: GridCellKind.Text,
      // header[col] is the name of the field
      displayData: String(data[row]?.[header[col]]??""),
      data: data[row]?.[header[col]],
    };
  }, []);
  // highlight-end
  // ...
  return ( <>
    // ...
    <DataEditor
      // ... props
      // highlight-next-line
      getCellContent={getContent}
    />
    // ...
  </> );
}
```

_Row Count_

`DataEditor` also accepts a `rows` property indicating the number of rows. This
is best managed in state:

```js
import { useState } from 'react';
import { DataEditor } from '@glideapps/glide-data-grid';

function App() {
  // highlight-next-line
  const [rows, setRows] = useState<number>(0); // number of rows
  // ...
  return ( <>
    // ...
    <DataEditor
      // ... props
      // highlight-next-line
      rows={rows}
    />
    // ...
  </> );
}
export default App;
```

_Editing Data_

The demo uses the `onCellEdited` callback to write back to the data store.

### Parsing Data

_SheetJS to Data Store_

The raw data objects are readily generated with `sheet_to_json`. The headers
can be pulled by extracting the first row of the worksheet:

```js
import { utils, WorkBook } from 'xlsx';

// ...

const update_backing_store = (wb: WorkBook) => {
  // get first worksheet
  const sheet = wb.Sheets[wb.SheetNames[0]];

  // set data
  // highlight-next-line
  data = utils.sheet_to_json<any>(sheet);

  // create a range consisting of the first row
  const range = utils.decode_range(sheet["!ref"]??"A1"); // original range
  range.e.r = range.s.r; // set ending row to starting row (select first row)

  // pull headers
  // highlight-next-line
  header = utils.sheet_to_json<string[]>(sheet, {header: 1, range})[0];
};

// ...
```

_Data Store to GDG_

Scheduling a refresh for the `DataEditor` involves updating the grid column
metadata and row count through the standard state.  It also requires a special
`updateCells` call to instruct the grid to mark the cached data as stale:

```js
import { useRef } from 'react'
import { WorkBook } from 'xlsx'
import { DataEditor, GridColumn, Item, DataEditorRef } from '@glideapps/glide-data-grid'

function App() {
  const ref = useRef<DataEditorRef>(null); // gdg ref
  // ...
  const parse_wb = (wb: WorkBook) => {
    update_backing_store(wb);

    // highlight-start
    // update column metadata by pulling from external header keys
    setCols(header.map(h => ({title: h, id: h} as GridColumn)));

    // update number of rows
    setRows(data.length);

    if(data.length > 0) {
      // create an array of the cells that must be updated
      let cells = data.map(
        (_,R) => Array.from({length:header.length}, (_,C) => ({cell: ([C,R] as Item)}))
      ).flat();
      // initiate update using the `ref` attached to the DataEditor
      ref.current?.updateCells(cells)
    }
    // highlight-end
  };
  // ...
  return ( <>
    // ...
    <DataEditor
      // ... props
      // highlight-next-line
      ref={ref}
    />
    // ...
  </> );
}
export default App;
```

### Writing Data

`json_to_sheet` works directly on the `data` array:

```js
const ws = utils.json_to_sheet(data); // easy :)
```

Since the editor can change the header titles, it is strongly recommended to
pull column data from the state and rewrite the header row:

```js
import { utils, writeFileXLSX } from 'xlsx';

function App() {
  // ...
  const exportXLSX = useCallback(() => {
    // highlight-start
    // generate worksheet using data with the order specified in the columns array
    const ws = utils.json_to_sheet(data, {header: cols.map(c => c.id ?? c.title)});

    // rewrite header row with titles
    utils.sheet_add_aoa(ws, [cols.map(c => c.title ?? c.id)], {origin: "A1"});
    // highlight-end

    // create workbook
    const wb = utils.book_new();
    utils.book_append_sheet(wb, ws, "Export"); // replace with sheet name
    // download file
    writeFileXLSX(wb, "sheetjs-gdg.xlsx");
  }, []);
  // ...
  return ( <>
    // ...
    // highlight-next-line
    <button onClick={exportXLSX}><b>Export XLSX!</b></button>
    // ...
  </> );
}
export default App;
```

## Demo

1) Create a new project:

```bash
npm create vite@latest -- sheetjs-gdg --template react-ts
cd sheetjs-gdg
npm i
```

Install SheetJS and Glide Data Grid required dependencies:

```bash
npm i --save https://cdn.sheetjs.com/xlsx-latest/xlsx-latest.tgz
npm i --save @glideapps/glide-data-grid lodash marked
```

Start dev server:

```bash
npm run dev
```

The terminal window will display a URL (typically `http://localhost:5173`).
Open the URL with a web browser.

2) Download [`App.tsx`](pathname:///gdg/App.tsx) and replace `src/App.tsx`:

```bash
curl -L -o src/App.tsx https://docs.sheetjs.com/gdg/App.tsx
```

Refresh the browser window and a grid should be displayed:

![glide-data-grid initial view](pathname:///gdg/pre.png)

3) To test the export functionality, make some changes to the grid data.

Suppose you believe that President Grover Cleveland should be counted once.
That would imply President Clinton should be index 41 and the indices of the
other presidents should be decremented. By double-clicking on each cell in the
Index column, a cell editor should appear. Decrement each index:

![glide-data-grid after edits](pathname:///gdg/post.png)

Click on the "Export" button to create a file!  Open the file and verify.