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Angular Data Grid - Local Virtual Scrolling

To optimize data load times and improve user navigation when binding DataGrid to a large dataset, you can enable virtual scrolling. In this demo, we bind the component to a dataset of 100,000 records.

To enable virtual scrolling, set scrolling.mode to "virtual".

Backend API
<dx-data-grid id="gridContainer" [dataSource]="dataSource" keyExpr="id" [customizeColumns]="customizeColumns" [showBorders]="true" (onContentReady)="onContentReady($event)" > <dxo-load-panel [enabled]="true"></dxo-load-panel> <dxo-scrolling mode="virtual"></dxo-scrolling> <dxo-sorting mode="none"></dxo-sorting> </dx-data-grid>
import { NgModule, Component, enableProdMode } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import {DataSourceOptions as DataSourceConfig} from 'devextreme-angular/common/data'; import { DxDataGridModule, DxDataGridTypes } from 'devextreme-angular/ui/data-grid'; import { Service } from './app.service'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } let modulePrefix = ''; // @ts-ignore if (window && window.config?.packageConfigPaths) { modulePrefix = '/app'; } @Component({ selector: 'demo-app', templateUrl: `app/app.component.html`, styleUrls: [`app/app.component.css`], providers: [Service], }) export class AppComponent { dataSource: DataSourceConfig; constructor(service: Service) { this.dataSource = service.generateData(100000); } customizeColumns(columns: DxDataGridTypes.Column[]) { columns[0].width = 70; } onContentReady(e: DxDataGridTypes.ContentReadyEvent) { e.component.option('loadPanel.enabled', false); } } @NgModule({ imports: [ BrowserModule, DxDataGridModule, ], declarations: [AppComponent], bootstrap: [AppComponent], }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #gridContainer { height: 440px; }
import { Injectable } from '@angular/core'; export class Employee { id: number; firstName: string; lastName: string; gender: string; birthDate: Date; } const employees: Employee[] = []; const surnames: string[] = [ 'Smith', 'Johnson', 'Brown', 'Taylor', 'Anderson', 'Harris', 'Clark', 'Allen', 'Scott', 'Carter']; const names: string[] = [ 'James', 'John', 'Robert', 'Christopher', 'George', 'Mary', 'Nancy', 'Sandra', 'Michelle', 'Betty']; const gender: string[] = ['Male', 'Female']; let s = 123456789; @Injectable() export class Service { random() { s = (1103515245 * s + 12345) % 2147483647; return s % (10 - 1); } generateData(count: number) { let i: number; const startBirthDate = Date.parse('1/1/1975'); const endBirthDate = Date.parse('1/1/1992'); for (i = 0; i < count; i++) { const birthDate = new Date(startBirthDate + Math.floor( this.random() * (endBirthDate - startBirthDate) / 10, )); birthDate.setHours(12); const nameIndex = this.random(); const item = { id: i + 1, firstName: names[nameIndex], lastName: surnames[this.random()], gender: gender[Math.floor(nameIndex / 5)], birthDate, }; employees.push(item); } return employees; } }
// In real applications, you should not transpile code in the browser. // You can see how to create your own application with Angular and DevExtreme here: // https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/ const componentNames = [ 'accordion', 'action-sheet', 'autocomplete', 'bar-gauge', 'box', 'bullet', 'button-group', 'button', 'calendar', 'card-view', 'chart', 'chat', 'check-box', 'circular-gauge', 'color-box', 'context-menu', 'data-grid', 'date-box', 'date-range-box', 'defer-rendering', 'diagram', 'draggable', 'drawer', 'drop-down-box', 'drop-down-button', 'file-manager', 'file-uploader', 'filter-builder', 'form', 'funnel', 'gallery', 'gantt', 'html-editor', 'linear-gauge', 'list', 'load-indicator', 'load-panel', 'lookup', 'map', 'menu', 'multi-view', 'nested', 'number-box', 'pagination', 'pie-chart', 'pivot-grid-field-chooser', 'pivot-grid', 'polar-chart', 'popover', 'popup', 'progress-bar', 'radio-group', 'range-selector', 'range-slider', 'recurrence-editor', 'resizable', 'responsive-box', 'sankey', 'scheduler', 'scroll-view', 'select-box', 'slider', 'sortable', 'sparkline', 'speed-dial-action', 'splitter', 'stepper', 'switch', 'tab-panel', 'tabs', 'tag-box', 'text-area', 'text-box', 'tile-view', 'toast', 'toolbar', 'tooltip', 'tree-list', 'tree-map', 'tree-view', 'validation-group', 'validation-summary', 'validator', 'vector-map', ]; window.exports = window.exports || {}; window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, }, meta: { 'typescript': { 'exports': 'ts', }, 'devextreme/time_zone_utils.js': { 'esModule': true, }, 'devextreme/localization.js': { 'esModule': true, }, 'devextreme/viz/palette.js': { 'esModule': true, }, '@angular/platform-browser-dynamic': { 'esModule': true, }, '@angular/platform-browser': { 'esModule': true, }, '@angular/core': { 'esModule': true, }, '@angular/common': { 'esModule': true, }, '@angular/common/http': { 'esModule': true, }, '@angular/animations': { 'esModule': true, }, '@angular/forms': { 'esModule': true, }, 'openai': { 'esModule': true, }, }, paths: { 'npm:': 'https://cdn.jsdelivr.net/npm/', 'bundles:': '../../../../bundles/', 'externals:': '../../../../bundles/externals/', }, map: { 'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js', 'typescript': 'npm:typescript@4.2.4/lib/typescript.js', 'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js', /* @angular */ '@angular/compiler': 'bundles:@angular/compiler.umd.js', '@angular/platform-browser-dynamic': 'bundles:@angular/platform-browser-dynamic.umd.js', '@angular/core': 'bundles:@angular/core.umd.js', '@angular/core/primitives/signals': 'bundles:@angular/core.primitives.signals.umd.js', '@angular/common': 'bundles:@angular/common.umd.js', '@angular/common/http': 'bundles:@angular/common-http.umd.js', '@angular/platform-browser': 'bundles:@angular/platform-browser.umd.js', '@angular/platform-browser/animations': 'bundles:@angular/platform-browser.umd.js', '@angular/forms': 'bundles:@angular/forms.umd.js', /* devextreme */ 'devextreme': 'npm:devextreme@25.1.3/cjs', 'devextreme-quill': 'npm:devextreme-quill@1.7.3/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.19', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.62', /* devextreme-angular umd maps */ 'devextreme-angular': 'bundles:devextreme-angular/devextreme-angular.umd.js', 'devextreme-angular/common/ai-integration': 'bundles:devextreme-angular/devextreme-angular-common-ai-integration.umd.js', 'devextreme-angular/core': 'bundles:devextreme-angular/devextreme-angular-core.umd.js', 'devextreme-angular/common/charts': 'bundles:devextreme-angular/devextreme-angular-common-charts.umd.js', 'devextreme-angular/common/core/animation': 'bundles:devextreme-angular/devextreme-angular-common-core-animation.umd.js', 'devextreme-angular/common/core/environment': 'bundles:devextreme-angular/devextreme-angular-common-core-environment.umd.js', 'devextreme-angular/common/core/events': 'bundles:devextreme-angular/devextreme-angular-common-core-events.umd.js', 'devextreme-angular/common/core/localization': 'bundles:devextreme-angular/devextreme-angular-common-core-localization.umd.js', 'devextreme-angular/common/core': 'bundles:devextreme-angular/devextreme-angular-common-core.umd.js', 'devextreme-angular/common/data/custom-store': 'bundles:devextreme-angular/devextreme-angular-common-data-custom-store.umd.js', 'devextreme-angular/common/data': 'bundles:devextreme-angular/devextreme-angular-common-data.umd.js', 'devextreme-angular/common/export/excel': 'bundles:devextreme-angular/devextreme-angular-common-export-excel.umd.js', 'devextreme-angular/common/export/pdf': 'bundles:devextreme-angular/devextreme-angular-common-export-pdf.umd.js', 'devextreme-angular/common/export': 'bundles:devextreme-angular/devextreme-angular-common-export.umd.js', 'devextreme-angular/common/grids': 'bundles:devextreme-angular/devextreme-angular-common-grids.umd.js', 'devextreme-angular/common': 'bundles:devextreme-angular/devextreme-angular-common.umd.js', 'devextreme-angular/http': 'bundles:devextreme-angular/devextreme-angular-http.umd.js', ...componentNames.reduce((acc, name) => { acc[`devextreme-angular/ui/${name}`] = `bundles:devextreme-angular/devextreme-angular-ui-${name}.umd.js`; acc[`devextreme-angular/ui/${name}/nested`] = `bundles:devextreme-angular/devextreme-angular-ui-${name}-nested.umd.js`; return acc; }, {}), 'tslib': 'npm:tslib/tslib.js', 'rxjs': 'npm:rxjs@7.5.3/dist/bundles/rxjs.umd.js', 'rxjs/operators': 'npm:rxjs@7.5.3/dist/cjs/operators/index.js', 'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js', 'luxon': 'npm:luxon@3.4.4/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign', 'inferno': 'npm:inferno@8.2.3/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@8.2.3/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js', '@preact/signals-core': 'npm:@preact/signals-core@1.8.0/dist/signals-core.min.js', // Prettier 'prettier/standalone': 'npm:prettier@2.8.8/standalone.js', 'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js', }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts', }, 'devextreme': { defaultExtension: 'js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/common/core/events/utils': { main: 'index', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, 'rxjs': { defaultExtension: 'js', }, 'rxjs/operators': { defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:rxjs@7.5.3/package.json', 'npm:rxjs@7.5.3/operators/package.json', 'npm:devexpress-diagram@2.2.19/package.json', 'npm:devexpress-gantt@4.1.62/package.json', ], }; System.config(window.config); // System.import('@angular/compiler').catch(console.error.bind(console));
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" lang="en"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/25.1.3/css/dx.light.css" /> <script src="https://cdn.jsdelivr.net/npm/core-js@2.6.12/client/shim.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/zone.js@0.14.10/bundles/zone.umd.js"></script> <script src="https://cdn.jsdelivr.net/npm/reflect-metadata@0.1.13/Reflect.js"></script> <script src="https://cdn.jsdelivr.net/npm/systemjs@0.21.3/dist/system.js"></script> <script src="config.js"></script> <script> System.import("app").catch(console.error.bind(console)); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <demo-app>Loading...</demo-app> </div> </body> </html>

Unlike infinite scrolling, virtual scrolling allows users to navigate to any section of rows immediately. DataGrid only loads displayed rows into memory and unloads rows as they are hidden by user scrolling. When virtual scrolling is enabled, Ctrl+Home and Ctrl+End focus the first cell in the first row/last cell in the last row of the component data set.