2023-03-12 06:25:57 +00:00
|
|
|
---
|
|
|
|
|
title: Canvas Datagrid
|
|
|
|
|
pagination_prev: demos/frontend/index
|
|
|
|
|
pagination_next: demos/net/index
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
<head>
|
|
|
|
|
<script src="https://unpkg.com/canvas-datagrid/dist/canvas-datagrid.js"></script>
|
|
|
|
|
</head>
|
|
|
|
|
|
2023-09-05 18:04:23 +00:00
|
|
|
[Canvas Datagrid](https://canvas-datagrid.js.org/) is a high-performance grid
|
2023-03-12 06:25:57 +00:00
|
|
|
with a straightforward API.
|
|
|
|
|
|
|
|
|
|
[Click here for a live standalone integration demo.](pathname:///cdg/)
|
|
|
|
|
|
2023-09-05 18:04:23 +00:00
|
|
|
:::note
|
|
|
|
|
|
|
|
|
|
This demo was last verified on 2023 September 03.
|
|
|
|
|
|
|
|
|
|
:::
|
|
|
|
|
|
2023-03-12 06:25:57 +00:00
|
|
|
## Live Demo
|
|
|
|
|
|
2023-09-24 03:59:48 +00:00
|
|
|
:::caution pass
|
2023-03-12 06:25:57 +00:00
|
|
|
|
|
|
|
|
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
|
2023-07-21 09:17:32 +00:00
|
|
|
const set_url = (evt) => setUrl(evt.target.value);
|
2023-03-12 06:25:57 +00:00
|
|
|
const [cdg, setCdg] = React.useState(null); // reference to grid object
|
|
|
|
|
|
|
|
|
|
return ( <>
|
|
|
|
|
<div height={300} width={300} ref={ref}/>
|
|
|
|
|
{!done && ( <>
|
|
|
|
|
<b>URL: </b><input type="text" value={url} onChange={set_url} size="50"/>
|
|
|
|
|
<br/><button onClick={async() => {
|
|
|
|
|
/* fetch and parse workbook */
|
|
|
|
|
const wb = XLSX.read(await (await fetch(url)).arrayBuffer());
|
|
|
|
|
const ws = wb.Sheets[wb.SheetNames[0]];
|
|
|
|
|
const data = XLSX.utils.sheet_to_json(ws, { header:1 });
|
|
|
|
|
|
|
|
|
|
/* set up grid and load data */
|
|
|
|
|
if(!cdg) setCdg(canvasDatagrid({ parentNode: ref.current, data }));
|
|
|
|
|
else cdg.data = data;
|
|
|
|
|
setDone(true);
|
|
|
|
|
}}><b>Fetch!</b></button>
|
|
|
|
|
</> )}
|
|
|
|
|
</> );
|
|
|
|
|
}
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
## 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
|
|
|
|
|
<script src="https://unpkg.com/canvas-datagrid/dist/canvas-datagrid.js"></script>
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
#### Previewing Data
|
|
|
|
|
|
|
|
|
|
The HTML document needs a container element:
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
<div id="gridctr"></div>
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
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
|
|
|
|
|
|
2023-09-05 18:04:23 +00:00
|
|
|
:::tip pass
|
|
|
|
|
|
2023-03-12 06:25:57 +00:00
|
|
|
This demo barely scratches the surface. The underlying grid component includes
|
|
|
|
|
many additional features that work with [SheetJS Pro](https://sheetjs.com/pro).
|
2023-09-05 18:04:23 +00:00
|
|
|
|
|
|
|
|
:::
|
