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