---
title: Canvas Datagrid
pagination_prev: demos/frontend/index
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---
[Canvas Datagrid](https://canvas-datagrid.js.org/) is a high-performance grid
with a straightforward API.
[Click here for a live standalone integration demo.](pathname:///cdg/)
:::note
This demo was last verified on 2023 September 03.
:::
## Live Demo
:::note
Due to CSS conflicts between the data grid and the documentation generator,
features like scrolling may not work as expected.
[The linked demo uses a simple HTML page.](pathname:///cdg/)
:::
```jsx live
function SheetJSCDG() {
const [url, setUrl] = React.useState("https://sheetjs.com/pres.numbers");
const [done, setDone] = React.useState(false);
const ref = React.useRef(); // ref to DIV container
const set_url = (evt) => setUrl(evt.target.value);
const [cdg, setCdg] = React.useState(null); // reference to grid object
return ( <>
{!done && ( <>
URL:
)}
);
}
```
## Integration Details
#### Obtaining the Library
The `canvas-datagrid` NodeJS packages include a minified script that can be
directly inserted as a script tag. The unpkg CDN also serves this script:
```html
```
#### Previewing Data
The HTML document needs a container element:
```html
```
Grid initialization is a one-liner:
```js
var grid = canvasDatagrid({
parentNode: document.getElementById('gridctr'),
data: []
});
```
For large data sets, it's necessary to constrain the size of the grid.
```js
grid.style.height = '100%';
grid.style.width = '100%';
```
Once the workbook is read and the worksheet is selected, assigning the data
variable automatically updates the view:
```js
grid.data = XLSX.utils.sheet_to_json(ws, {header:1});
```
This demo previews the first worksheet.
#### Editing
`canvas-datagrid` handles the entire edit cycle. No intervention is necessary.
#### Saving Data
`grid.data` is immediately readable and can be converted back to a worksheet.
Some versions return an array-like object without the length, so a little bit of
preparation may be needed:
```js
/* converts an array of array-like objects into an array of arrays */
function prep(arr) {
var out = [];
for(var i = 0; i < arr.length; ++i) {
if(!arr[i]) continue;
if(Array.isArray(arr[i])) { out[i] = arr[i]; continue };
var o = new Array();
Object.keys(arr[i]).forEach(function(k) { o[+k] = arr[i][k] });
out[i] = o;
}
return out;
}
/* build worksheet from the grid data */
var ws = XLSX.utils.aoa_to_sheet(prep(grid.data));
/* build up workbook */
var wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, 'SheetJS');
/* generate download */
XLSX.writeFile(wb, "SheetJS.xlsx");
```
#### Additional Features
:::tip pass
This demo barely scratches the surface. The underlying grid component includes
many additional features that work with [SheetJS Pro](https://sheetjs.com/pro).
:::