Auto-Size Rows Asynchronously (Angular)

Auto-sizing all rows on a FlexGrid control with a lot of data is a time-consuming process. This sample demonstrates how you can auto-size rows asynchronously to improve performance. The code listens to events and auto-sizes only rows that are currently in view and have not been auto-sized yet.

Learn about FlexGrid | FlexGrid API Reference

This example uses Angular.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import './styles.css'; // import * as wjGrid from '@mescius/wijmo.grid'; import '@angular/compiler'; import { Component, Inject, enableProdMode, ViewChild, ɵresolveComponentResources } from '@angular/core'; import { BrowserModule, bootstrapApplication } from '@angular/platform-browser'; import { WjGridModule } from '@mescius/wijmo.angular2.grid'; import { DataService } from './app.data'; // @Component({ standalone: true, providers: [DataService], imports: [WjGridModule, BrowserModule], selector: 'app-component', templateUrl: 'src/app.component.html' }) export class AppComponent { @ViewChild('flexGrid', { static: true }) theGrid: wjGrid.FlexGrid; data: any; // DataSvc will be passed by derived classes constructor(@Inject(DataService) private dataService: DataService) { this.data = dataService.getData(); } // onLoadedRows(grid: wjGrid.FlexGrid) { setTimeout(() => { this.autoSizeRowsAsync(grid); }, 50); } // onCellEditEnded(grid: wjGrid.FlexGrid, e: wjGrid.CellEditEndingEventArgs) { if (grid.columns[e.col].wordWrap) { this.autoSizeRowsAsync(grid, e.row); } } // onScrollPositionChanged(grid: wjGrid.FlexGrid, e: wjGrid.CellRangeEventArgs) { var vr = grid.viewRange; for (var r = vr.topRow; r <= vr.bottomRow; r++) { if (grid.rows[r].height == null) { grid.autoSizeRows(r, r); //console.log('autosized row ' + r) } } } // onResizedColumn(grid: wjGrid.FlexGrid, e: wjGrid.CellRangeEventArgs) { if (grid.columns[e.col].wordWrap) { this.autoSizeRowsAsync(grid); } } // autoSizeRowsAsync(grid: wjGrid.FlexGrid, rowIndex?: number) { if (rowIndex != null) { grid.rows[rowIndex].height = null; } else { grid.rows.forEach((row: any) => row.height = null); } grid.onScrollPositionChanged(); } // onAsSyncClick() { var start = Date.now(); this.theGrid.autoSizeRows(); alert('AutoSized all rows in ' + (Date.now() - start) + 'ms'); } } //\\ // enableProdMode(); // Resolve resources (templateUrl, styleUrls etc), After resolution all URLs have been converted into `template` strings. ɵresolveComponentResources(fetch).then(() => { // Bootstrap application bootstrapApplication(AppComponent).catch(err => console.error(err)); });
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo FlexGrid Auto-Size Rows asynchronously</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- Polyfills --> <script src="node_modules/core-js/client/shim.min.js"></script> <script src="node_modules/zone.js/fesm2015/zone.min.js"></script> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.21.5/system.src.js" integrity="sha512-skZbMyvYdNoZfLmiGn5ii6KmklM82rYX2uWctBhzaXPxJgiv4XBwJnFGr5k8s+6tE1pcR1nuTKghozJHyzMcoA==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> // workaround to load 'rxjs/operators' from the rxjs bundle System.import('rxjs').then(function (m) { System.set(SystemJS.resolveSync('rxjs/operators'), System.newModule(m.operators)); System.import('./src/app.component'); }); </script> </head> <body> <app-component></app-component> </body> </html>
<div class="container-fluid"> <button (click)="onAsSyncClick()" class="btn btn-default">AutoSizeRows (synchronously)</button> <wj-flex-grid #flexGrid [itemsSource]="data" [autoGenerateColumns]=false [quickAutoSize]=true (loadedRows)="onLoadedRows(flexGrid)" (cellEditEnded)="onCellEditEnded(flexGrid, $event)" (scrollPositionChanged)="onScrollPositionChanged(flexGrid ,$event)" (resizedColumn)="onResizedColumn(flexGrid, $event)"> <wj-flex-grid-column binding="id" header="ID" [minWidth]=60 [isReadOnly]=true></wj-flex-grid-column> <wj-flex-grid-column binding="countries" header="Countries" [width]="150" [wordWrap]=true></wj-flex-grid-column> <wj-flex-grid-column binding="sales" header="Sales"></wj-flex-grid-column> <wj-flex-grid-column binding="expenses" header="Expenses"></wj-flex-grid-column> </wj-flex-grid> </div>
import { Injectable } from '@angular/core'; interface DataItem { id: number; countries: string; sales: number; expenses: number; } function getCountries(): string { var countries = 'Austria,Belgium,Canada,Denmark,Estonia,Finland,Germany,Hungary,Ireland,Japan,Korea,Lebanon,Mexico,Norway,Portugal,Qatar,Romania,Spain,Turkey,Ukraine,Venezuela,Zaire'.split(','); var c = []; var cnt = Math.round(Math.random() * 8) + 1; var start = Math.round(Math.random() * countries.length); for (var i = 0; i < cnt; i++) { c.push(countries[(i + start) % countries.length]); } return c.join(', '); } @Injectable() export class DataService { getData(): DataItem[] { var data = []; for (var i = 0; i < 10000; i++) { data.push({ id: i, countries: getCountries(), sales: Math.random() * 10000, expenses: Math.random() * 5000 }); } return data; } }
body { margin-bottom: 36pt; } .wj-flexgrid { max-height: 300px; margin: 6px 0; }
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packages: { "./src": { defaultExtension: 'ts' }, "node_modules": { defaultExtension: 'js' }, wijmo: { defaultExtension: 'js', } } }); })(this);