가상화 (React)

FlexGrid는 주로 JavaScript 데이터 객체를 사용자가 조작할 수 있는 DOM 요소로 변환하는 작업을 수행합니다. 대부분의 경우, 데이터는 수천 개의 항목을 포함하는 큰 배열로 구성되어 있습니다. 각 항목의 DOM 요소를 만든다면 크고 느린 페이지가 생성될 것입니다. 가상화는 표시되는 데이터 부분을 추적하고 해당 부분만 렌더링하는 프로세스입니다. 이렇게 하면 문서 트리의 DOM 요소 수가 감소하고 성능이 훨씬 향상됩니다. FlexGrid는 viewRange 속성을 통해 표시되는 데이터 부분을 노출합니다. 사용자가 화면 크기를 조정하거나 그리드를 스크롤할 때마다 viewRange가 업데이트되고, 그리드가 자식 DOM 요소를 업데이트합니다.

이 데모는 React를 기반으로합니다.

import "bootstrap.css"; import "@grapecity/wijmo.styles/wijmo.css"; import "./app.css"; // import * as React from "react"; import * as ReactDOM from "react-dom/client"; import * as wjGrid from "@grapecity/wijmo.react.grid"; import * as wjcCore from "@grapecity/wijmo"; class App extends React.Component { constructor(props) { super(props); this.state = { data: this.getData(100), rowCount: '', cellCount: '' }; } render() { return (<div className="container-fluid"> <wjGrid.FlexGrid initialized={this.flexInitialized.bind(this)} itemsSource={this.state.data}/> <p> The grid now has <span id="rowCount">{this.state.rowCount}</span> {' '}rows and <span id="cellCount">{this.state.cellCount}</span> cell elements. </p> </div>); } flexInitialized(flexgrid) { this.setState({ rowCount: flexgrid.rows.length.toString(), cellCount: flexgrid.hostElement .querySelectorAll(".wj-cell") .length.toString() }); flexgrid.updatedView.addHandler((s, e) => { this.setState({ rowCount: s.rows.length.toString(), cellCount: s.hostElement.querySelectorAll(".wj-cell").length.toString() }); }); flexgrid.scrollPositionChanged.addHandler((s, e) => { // if we're close to the bottom, add 20 items if (s.viewRange.bottomRow >= s.rows.length - 1) { let view = s.collectionView; let index = view.currentPosition; // keep position in case the view is sorted this.addData(this.state.data, 20); view.refresh(); view.currentPosition = index; } }); } updateCurrentInfo() { this.setState({ selectedItem: wjcCore.format("Country: <b>{country}</b>, Sales: <b>{sales:c0}</b> Expenses: <b>{expenses:c0}</b>", this.flex.collectionView.currentItem) }); } addData(data, cnt) { let more = this.getData(cnt, data.length); for (let i = 0; i < more.length; i++) { data.push(more[i]); } } getData(cnt, start) { let data = []; let countries = "USA,Germany,UK,Japan,Italy,Greece".split(","); if (start == null) { start = 0; } for (let i = 0; i < cnt; i++) { data.push({ id: i + start, country: countries[i % countries.length], date: new Date(2014, i % 12, i % 28), amount: Math.random() * 10000, active: i % 4 === 0 }); } return data; } } setTimeout(() => { const container = document.getElementById('app'); if (container) { const root = ReactDOM.createRoot(container); root.render(<App />); } }, 100);
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo FlexGrid Virtualization</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="node_modules/systemjs/dist/system.src.js"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div id="app"></div> </body> </html>
.wj-flexgrid { height: 250px; margin: 6px 0px; } #rowCount, #cellCount { font-weight: bold; } body { margin-bottom: 24pt; }
(function (global) { System.config({ transpiler: 'plugin-babel', babelOptions: { es2015: true, react: true }, meta: { '*.css': { loader: 'css' } }, paths: { // paths serve as alias 'npm:': 'node_modules/' }, // map tells the System loader where to look for things map: { 'jszip': 'npm:jszip/dist/jszip.js', '@grapecity/wijmo': 'npm:@grapecity/wijmo/index.js', '@grapecity/wijmo.input': 'npm:@grapecity/wijmo.input/index.js', '@grapecity/wijmo.styles': 'npm:@grapecity/wijmo.styles', '@grapecity/wijmo.cultures': 'npm:@grapecity/wijmo.cultures', '@grapecity/wijmo.chart': 'npm:@grapecity/wijmo.chart/index.js', '@grapecity/wijmo.chart.analytics': 'npm:@grapecity/wijmo.chart.analytics/index.js', '@grapecity/wijmo.chart.animation': 'npm:@grapecity/wijmo.chart.animation/index.js', '@grapecity/wijmo.chart.annotation': 'npm:@grapecity/wijmo.chart.annotation/index.js', '@grapecity/wijmo.chart.finance': 'npm:@grapecity/wijmo.chart.finance/index.js', '@grapecity/wijmo.chart.finance.analytics': 'npm:@grapecity/wijmo.chart.finance.analytics/index.js', '@grapecity/wijmo.chart.hierarchical': 'npm:@grapecity/wijmo.chart.hierarchical/index.js', '@grapecity/wijmo.chart.interaction': 'npm:@grapecity/wijmo.chart.interaction/index.js', '@grapecity/wijmo.chart.radar': 'npm:@grapecity/wijmo.chart.radar/index.js', '@grapecity/wijmo.chart.render': 'npm:@grapecity/wijmo.chart.render/index.js', '@grapecity/wijmo.chart.webgl': 'npm:@grapecity/wijmo.chart.webgl/index.js', '@grapecity/wijmo.chart.map': 'npm:@grapecity/wijmo.chart.map/index.js', '@grapecity/wijmo.gauge': 'npm:@grapecity/wijmo.gauge/index.js', '@grapecity/wijmo.grid': 'npm:@grapecity/wijmo.grid/index.js', '@grapecity/wijmo.grid.detail': 'npm:@grapecity/wijmo.grid.detail/index.js', '@grapecity/wijmo.grid.filter': 'npm:@grapecity/wijmo.grid.filter/index.js', '@grapecity/wijmo.grid.search': 'npm:@grapecity/wijmo.grid.search/index.js', '@grapecity/wijmo.grid.grouppanel': 'npm:@grapecity/wijmo.grid.grouppanel/index.js', '@grapecity/wijmo.grid.multirow': 'npm:@grapecity/wijmo.grid.multirow/index.js', '@grapecity/wijmo.grid.transposed': 'npm:@grapecity/wijmo.grid.transposed/index.js', '@grapecity/wijmo.grid.transposedmultirow': 'npm:@grapecity/wijmo.grid.transposedmultirow/index.js', '@grapecity/wijmo.grid.pdf': 'npm:@grapecity/wijmo.grid.pdf/index.js', '@grapecity/wijmo.grid.sheet': 'npm:@grapecity/wijmo.grid.sheet/index.js', '@grapecity/wijmo.grid.xlsx': 'npm:@grapecity/wijmo.grid.xlsx/index.js', '@grapecity/wijmo.grid.selector': 'npm:@grapecity/wijmo.grid.selector/index.js', '@grapecity/wijmo.grid.cellmaker': 'npm:@grapecity/wijmo.grid.cellmaker/index.js', '@grapecity/wijmo.grid.immutable': 'npm:@grapecity/wijmo.grid.immutable/index.js', '@grapecity/wijmo.touch': 'npm:@grapecity/wijmo.touch/index.js', '@grapecity/wijmo.cloud': 'npm:@grapecity/wijmo.cloud/index.js', '@grapecity/wijmo.nav': 'npm:@grapecity/wijmo.nav/index.js', '@grapecity/wijmo.odata': 'npm:@grapecity/wijmo.odata/index.js', 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'npm:bootstrap/dist/css/bootstrap.min.css', 'css': 'npm:systemjs-plugin-css/css.js', 'plugin-babel': 'npm:systemjs-plugin-babel/plugin-babel.js', 'systemjs-babel-build':'npm:systemjs-plugin-babel/systemjs-babel-browser.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);