docs.sheetjs.com/docz/static/rdg/App.tsx

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import React, { useEffect, useState, ChangeEvent } from "react";
import DataGrid, { textEditor, Column } from "react-data-grid";
import { read, utils, WorkSheet, writeFile } from "xlsx";
import 'react-data-grid/lib/styles.css';
import './App.css';
type DataSet = { [index: string]: WorkSheet; };
type Row = any[];
type AOAColumn = Column<Row>;
type RowCol = { rows: Row[]; columns: AOAColumn[]; };
function arrayify(rows: any[]): Row[] {
return rows.map(row => {
if(Array.isArray(row)) return row;
var length = Object.keys(row).length;
for(; length > 0; --length) if(row[length-1] != null) break;
return Array.from({length, ...row});
});
}
/* this method returns `rows` and `columns` data for sheet change */
const getRowsCols = ( data: DataSet, sheetName: string ): RowCol => ({
rows: utils.sheet_to_json<Row>(data[sheetName], {header:1}),
columns: Array.from({
length: utils.decode_range(data[sheetName]["!ref"]||"A1").e.c + 1
}, (_, i) => ({ key: String(i), name: utils.encode_col(i), editor: textEditor }))
});
export default function App() {
const [rows, setRows] = useState<Row[]>([]); // data rows
const [columns, setColumns] = useState<AOAColumn[]>([]); // columns
const [workBook, setWorkBook] = useState<DataSet>({} as DataSet); // workbook
const [sheets, setSheets] = useState<string[]>([]); // list of sheet names
const [current, setCurrent] = useState<string>(""); // selected sheet
/* called when sheet dropdown is changed */
function selectSheet(name: string) {
/* update workbook cache in case the current worksheet was changed */
workBook[current] = utils.aoa_to_sheet(arrayify(rows));
/* get data for desired sheet and update state */
const { rows: new_rows, columns: new_columns } = getRowsCols(workBook, name);
setRows(new_rows);
setColumns(new_columns);
setCurrent(name);
}
/* this method handles refreshing the state with new workbook data */
async function handleAB(file: ArrayBuffer): Promise<void> {
/* read file data */
const data = read(file);
/* update workbook state */
setWorkBook(data.Sheets);
setSheets(data.SheetNames);
/* select the first worksheet */
const name = data.SheetNames[0];
const { rows: new_rows, columns: new_columns } = getRowsCols(data.Sheets, name);
setRows(new_rows);
setColumns(new_columns);
setCurrent(name);
}
/* called when file input element is used to select a new file */
async function handleFile(ev: ChangeEvent<HTMLInputElement>): Promise<void> {
const file = await ev.target.files?.[0]?.arrayBuffer();
if(file) await handleAB(file);
}
/* when page is loaded, fetch and processs worksheet */
useEffect(() => { (async () => {
const f = await fetch("https://docs.sheetjs.com/pres.numbers");
await handleAB(await f.arrayBuffer());
})(); }, []);
/* method is called when one of the save buttons is clicked */
function saveFile(ext: string): void {
console.log(rows);
/* update current worksheet in case changes were made */
workBook[current] = utils.aoa_to_sheet(arrayify(rows));
/* construct workbook and loop through worksheets */
const wb = utils.book_new();
sheets.forEach((n) => { utils.book_append_sheet(wb, workBook[n], n); });
/* generate a file and download it */
writeFile(wb, "SheetJSRDG." + ext);
}
return (
<>
<h3>SheetJS × React-Data-Grid Demo</h3>
<input type="file" onChange={handleFile} />
{sheets.length > 0 && ( <>
<p>Use the dropdown to switch to a worksheet:&nbsp;
<select onChange={async (e) => selectSheet(sheets[+(e.target.value)])}>
{sheets.map((sheet, idx) => (<option key={sheet} value={idx}>{sheet}</option>))}
</select>
</p>
<div className="flex-cont"><b>Current Sheet: {current}</b></div>
<DataGrid columns={columns} rows={rows} onRowsChange={setRows} />
<p>Click one of the buttons to create a new file with the modified data</p>
<div className="flex-cont">{["xlsx", "xlsb", "xls"].map((ext) => (
<button key={ext} onClick={() => saveFile(ext)}>export [.{ext}]</button>
))}</div>
</> )}
</>
);
}