Web Workers (React)

This sample demonstrates how to use Web Workers to export FlexGrid to a PDF or generate a custom PDF in a background thread.

Learn about FlexGrid | FlexGrid API Reference

This example uses React.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React, { useEffect, useRef, useState } from 'react'; import useEvent from 'react-use-event-hook'; import * as chart from '@mescius/wijmo.chart'; import * as pdf from '@mescius/wijmo.pdf'; import * as gridPdf from '@mescius/wijmo.grid.pdf'; import '@mescius/wijmo.chart.render'; import * as wjcGrid from '@mescius/wijmo.react.grid'; import * as WjChartModule from '@mescius/wijmo.react.chart'; import './app.css'; import { expenses, data } from './data'; const docName = 'FlexGrid.pdf'; const totals = ((totals) => [ { name: 'Hotel', value: totals.hotel }, { name: 'Transport', value: totals.transport }, { name: 'Meal', value: totals.meal }, { name: 'Fuel', value: totals.fuel }, { name: 'Misc', value: totals.Misc } ])(expenses.totals); const gridExportSettings = { styles: { cellStyle: { backgroundColor: '#ffffff', borderColor: '#c6c6c6' }, altCellStyle: { backgroundColor: '#f9f9f9' }, groupCellStyle: { backgroundColor: '#dddddd' }, headerCellStyle: { backgroundColor: '#eaeaea' } } }; function App() { const [count, setCount] = useState(0); const ctx1 = useRef({ exporting: false, progress: 0, preparing: false, worker: null }); const ctx2 = useRef({ exporting: false, progress: 0, preparing: false, worker: null }); const ctx3 = useRef({ exporting: false, progress: 0, preparing: false, worker: null }); const grid1Ref = useRef(); const grid2Ref = useRef(); const grid3Ref = useRef(); const pieRef = useRef(); const forceUpdate = () => setCount(Math.random()); const initializeGrid = useEvent((source) => { grid1Ref.current = source; }); const initializeGrid2 = useEvent((source) => { grid2Ref.current = source; }); const initializeGrid3 = useEvent((source) => { grid3Ref.current = source; }); const initializePie = useEvent((source) => { pieRef.current = source; }); const export1 = () => { const ctx = ctx1.current; if (!ctx.exporting) { start(ctx, './export-grid', () => { if (ctx.worker && grid1Ref.current) { gridPdf.PdfWebWorkerClient.exportGrid(ctx.worker, grid1Ref.current, docName, gridExportSettings, undefined, (prog) => { progress(ctx, prog); }); } }); } else { cancel(ctx); } }; const export2 = () => { const ctx = ctx2.current; if (!ctx.exporting) { start(ctx, './export', () => { if (ctx.worker) { gridPdf.PdfWebWorkerClient.addString(ctx.worker, 'Title', 'title'); gridPdf.PdfWebWorkerClient.addImage(ctx.worker, 'resources/canada.png', 'flag'); pieRef.current.saveImageToDataUrl(chart.ImageFormat.Svg, (url) => { if (ctx.worker) { gridPdf.PdfWebWorkerClient.addImage(ctx.worker, url, 'chart'); } }); if (grid2Ref.current) { gridPdf.PdfWebWorkerClient.addGrid(ctx.worker, grid2Ref.current, 'grid', gridExportSettings); } gridPdf.PdfWebWorkerClient.export(ctx.worker, null, (data) => pdf.saveBlob(data.blob, docName), (prog) => progress(ctx, prog)); } }); } else { cancel(ctx); } }; const export3 = () => { const ctx = ctx3.current; if (!ctx.exporting) { start(ctx, './api', () => { if (ctx.worker) { ctx.worker.addEventListener('message', e => { if (e.data.type === 'progress') { progress(ctx, e.data.value); } else { pdf.saveBlob(new Blob([new Uint8Array(e.data.data)], { type: 'application/pdf' }), docName); } }); if (grid3Ref.current) { let gridData = gridPdf.PdfWebWorkerClient.serializeGrid(grid3Ref.current, gridExportSettings); // Send gridData as a tranferable object ctx.worker.postMessage({ grid: gridData, settings: JSON.stringify(gridExportSettings) }, [gridData]); } } }); } else { cancel(ctx); } }; /** * Creates web worker that executes the module from the specified URL. * @param url The module URL, relative to the src/workers directory. * @param ready */ const loadWorker = (url, ready) => { let worker = new Worker('src/workers/worker-loader.js'); worker.addEventListener('message', (e) => { if (e.data === '#ready#') { ready(); } }); worker.postMessage({ url: url }); return worker; }; const start = (ctx, url, ready) => { ctx.preparing = true; ctx.progress = 0; ctx.worker = loadWorker(url, () => ready()); forceUpdate(); }; const progress = (ctx, progress) => { if (progress === 0 || progress === 1) { ctx.preparing = false; ctx.exporting = progress === 0; ctx.progress = progress; } else { ctx.progress = progress; } forceUpdate(); }; const cancel = (ctx) => { if (ctx.worker) { ctx.worker.terminate(); } ctx.exporting = false; ctx.progress = 0; ctx.worker = null; forceUpdate(); }; useEffect(() => { return function cleanup() { if (ctx1.current.worker) { ctx1.current.worker.terminate(); ctx1.current.worker = null; } if (ctx2.current.worker) { ctx2.current.worker.terminate(); ctx2.current.worker = null; } if (ctx3.current.worker) { ctx3.current.worker.terminate(); ctx3.current.worker = null; } }; }, []); return (<div className="container-fluid"> <p> This sample demonstrates the "Simple single grid export" scenario and shows how to export FlexGrid in a background thread. </p> <button className="btn btn-default" disabled={ctx1.current.preparing} onClick={export1}>{ctx1.current.exporting ? 'Cancel' : 'Export'}</button>&nbsp; <span>{(ctx1.current.progress * 100).toFixed(1) + "%"}</span> <wjcGrid.FlexGrid className="grid" autoGenerateColumns={false} headersVisibility="Column" allowMerging="All" itemsSource={data} isDisabled={ctx1.current.preparing} initialized={initializeGrid}> <wjcGrid.FlexGridColumn header="ID" binding="id"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Start Date" binding="start" format="d"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="End Date" binding="end" format="d"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Country" binding="country"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Product" binding="product"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Amount" binding="amount" format="c"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Color" binding="color"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Pending" binding="amount2" format="c2"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Discount" binding="discount" format="p1"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Active" binding="active"></wjcGrid.FlexGridColumn> </wjcGrid.FlexGrid> <hr /> <p> This sample demonstrates the "Custom document generation" scenario and shows how to export FlexPie (as a SVG image), FlexGrid and PNG image to a PDF in a background thread. </p> <p> The <a href="https://www.npmjs.com/package/xmldom">xmldom</a> library is used here to bring DOM support to the server to be able to draw SVG. </p> <button className="btn btn-default" disabled={ctx2.current.preparing} onClick={export2}>{ctx2.current.exporting ? 'Cancel' : 'Export'}</button>&nbsp; <span>{(ctx2.current.progress * 100).toFixed(1) + "%"}</span> <p></p> <div className="row"> <div className="col-md-6"> <WjChartModule.FlexPie itemsSource={totals} binding="value" bindingName="name" innerRadius={0.75} initialized={initializePie}> <WjChartModule.FlexPieDataLabel content="{value:c1}" position="Inside"></WjChartModule.FlexPieDataLabel> </WjChartModule.FlexPie> </div> <div className="col-md-6"> <wjcGrid.FlexGrid className="grid" autoGenerateColumns={false} headersVisibility="Column" allowMerging="All" itemsSource={data} isDisabled={ctx2.current.preparing} initialized={initializeGrid2}> <wjcGrid.FlexGridColumn header="ID" binding="id"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Start Date" binding="start" format="d"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="End Date" binding="end" format="d"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Country" binding="country"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Product" binding="product"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Amount" binding="amount" format="c"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Color" binding="color"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Pending" binding="amount2" format="c2"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Discount" binding="discount" format="p1"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Active" binding="active"></wjcGrid.FlexGridColumn> </wjcGrid.FlexGrid> </div> </div> <hr /> <p> This sample demonstrates the "Low-level usage of Web Workers API" scenario and shows how to export FlexGrid to a PDF in a background thread using Web Workers API. </p> <button className="btn btn-default" disabled={ctx3.current.preparing} onClick={export3}>{ctx3.current.exporting ? 'Cancel' : 'Export'}</button>&nbsp; <span>{(ctx3.current.progress * 100).toFixed(1) + "%"}</span> <p></p> <wjcGrid.FlexGrid className="grid" autoGenerateColumns={false} headersVisibility="Column" allowMerging="All" itemsSource={data} isDisabled={ctx3.current.preparing} initialized={initializeGrid3}> <wjcGrid.FlexGridColumn header="ID" binding="id"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Start Date" binding="start" format="d"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="End Date" binding="end" format="d"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Country" binding="country"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Product" binding="product"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Amount" binding="amount" format="c"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Color" binding="color"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Pending" binding="amount2" format="c2"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Discount" binding="discount" format="p1"></wjcGrid.FlexGridColumn> <wjcGrid.FlexGridColumn header="Active" binding="active"></wjcGrid.FlexGridColumn> </wjcGrid.FlexGrid> </div>); } const container = document.getElementById('app'); if (container) { const root = ReactDOM.createRoot(container); root.render(<App />); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Web Workers</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.40/system.src.js" integrity="sha512-G6mEj6h18+m3MvzdviSDfPle/TfH0//cXcB33AKlNR/Rha0yQsKefDZKRTkIZos97HEGq2JMV1RT5ybMoQ3WsQ==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div id="app"></div> </body> </html>
.grid { margin-top: 20px; height: 300px; }
function getData(count) { // data used to generate random items const countries = ['US', 'Germany', 'UK', 'Japan', 'Italy', 'Greece']; const products = ['Widget', 'Gadget', 'Doohickey']; const colors = ['Orange', 'White', 'Red', 'Green', 'Blue']; // let data = []; let dt = new Date(); // // add count items for (let i = 0; i < count; i++) { // constants used to create data items let date = new Date(dt.getFullYear(), i % 12, 25, i % 24, i % 60, i % 60), countryId = Math.floor(Math.random() * countries.length), productId = Math.floor(Math.random() * products.length), colorId = Math.floor(Math.random() * colors.length); // // create the item let item = { id: i, start: date, end: date, country: countries[countryId], product: products[productId], color: colors[colorId], amount: Math.random() * 10000 - 5000, amount2: Math.random() * 10000 - 5000, discount: Math.random() / 4, active: i % 4 == 0, }; // // add the item to the list data.push(item); } return data; } function getExpenses() { // [5; 10] let count = 5 + Math.round(Math.random() * 5), ret = { items: [], totals: { hotel: 0, transport: 0, fuel: 0, meal: 0, Misc: 0, total: 0 } }, msPerDay = 1000 * 24 * 60 * 60, curDate = Date.now() - 60 * msPerDay; // for (let i = 0; i < count; i++) { let item = { date: new Date(curDate), description: 'Customer visit', hotel: 30 + Math.random() * 200, transport: 10 + Math.random() * 150, fuel: Math.random() * 50, meal: 30 + Math.random() * 170, Misc: Math.random() * 220, total: 0 }; // item.total = item.hotel + item.transport + item.fuel + item.meal + item.Misc; // ret.totals.fuel += item.fuel; ret.totals.hotel += item.hotel; ret.totals.meal += item.meal; ret.totals.Misc += item.Misc; ret.totals.total += item.total; ret.totals.transport += item.transport; // ret.items.push(item); // curDate += msPerDay * Math.round(Math.random() * 4); } // return ret; } export const data = getData(1500); export const expenses = getExpenses();
import { PdfWebWorker } from '@mescius/wijmo.grid.pdf'; PdfWebWorker.initExportGrid();
import xmldom from 'xmldom'; import * as pdf from '@mescius/wijmo.pdf'; import * as gridPdf from '@mescius/wijmo.grid.pdf'; // (<any>self).DOMParser = xmldom.DOMParser; // gridPdf.PdfWebWorker.initExport((doc: pdf.PdfDocument, clientData: gridPdf.IClientData) => { gridPdf.PdfWebWorker.sendExportProgress(0); // doc.drawText(clientData['title'].content); doc.drawImage(clientData['flag'].content); doc.drawSvg(clientData['chart'].content); // // Suppose that text and images rendering takes 5% of the time. gridPdf.PdfWebWorker.sendExportProgress(0.05); // let gridData = clientData['grid']; gridData.settings.progress = (value: number) => { // Change progress from 6% to 90%. Left the final 10% for the document finalization, which will start after the doc.end() method is called. gridPdf.PdfWebWorker.sendExportProgress(map(value, 0, 1, 0.06, 0.9)); }; // doc.ended.addHandler(() => { // Document has been created, set progress to 100%. gridPdf.PdfWebWorker.sendExportProgress(1); }); // gridPdf.FlexGridPdfConverter.draw(gridData.content, doc, undefined, undefined, gridData.settings); // doc.end(); }); // function map(value: number, inMin: number, inMax: number, outMin: number, outMax: number) { let k = (outMax - outMin) / (inMax - inMin); return (value - inMin) * k + outMin; }
declare function postMessage(message: any, transfer?: Transferable[]): void; import * as pdf from '@mescius/wijmo.pdf'; import * as gridPdf from '@mescius/wijmo.grid.pdf'; // addEventListener('message', e => { let json = e.data.grid, settings = JSON.parse(e.data.settings); // settings.documentOptions = settings.documentOptions || {}; // settings.documentOptions.ended = (sender: pdf.PdfDocument, args: pdf.PdfDocumentEndedEventArgs) => { postProgress(1); // 100% // // Convert Blob to a transferable object... let fileReader = new FileReader(); fileReader.onload = (e) => { let buffer = (<any>e.target).result; // ...and send it to client. postMessage({ data: buffer }, [buffer]); }; fileReader.readAsArrayBuffer(args.blob); }; // settings.progress = (value: number) => { postProgress(value * 0.9); // 0% to 90% }; // let doc = new pdf.PdfDocument(settings.documentOptions), grid = gridPdf.PdfWebWorker.deserializeGrid(json, settings); // gridPdf.FlexGridPdfConverter.draw(grid, doc, null, null, settings); // doc.end(); }); // function postProgress(value) { postMessage({ type: 'progress', value: value }); }
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"npm:react-use-event-hook/dist/esm/useEvent.js", }, // packages tells the System loader how to load when no filename and/or no extension packages: { src: { defaultExtension: 'jsx' }, "node_modules": { defaultExtension: 'js' }, } }); })(this);