3.6 KiB
| title | pagination_prev | pagination_next |
|---|---|---|
| Canvas Datagrid | demos/frontend/index | demos/net/index |
After extensive testing, canvas-datagrid stood out as a high-performance grid
with a straightforward API.
Click here for a live standalone integration demo.
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.
:::
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 = React.useCallback((evt) => setUrl(evt.target.value));
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:
<script src="https://unpkg.com/canvas-datagrid/dist/canvas-datagrid.js"></script>
Previewing Data
The HTML document needs a container element:
<div id="gridctr"></div>
Grid initialization is a one-liner:
var grid = canvasDatagrid({
parentNode: document.getElementById('gridctr'),
data: []
});
For large data sets, it's necessary to constrain the size of the grid.
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:
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:
/* 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
This demo barely scratches the surface. The underlying grid component includes many additional features that work with SheetJS Pro.