Angular

Implementing Virtual Scrolling in Angular for Large Data Sets

Introduction

Using Angular applications with extensive datasets requires proper implementation of virtual scrolling because full item rendering usually impacts performance negatively. Virtual scrolling method efficiently displays only the visible items which enhances system performance as well as user experience.

Install Angular CDK

The @angular/cdk package from Angular offers virtual scrolling functionalities to users.

You need to execute the following command for installation:

npm install @angular/cdk

Import the Scrolling Module

You should add the ScrollingModule to your AppModule or feature module.

import { NgModule } from '@angular/core';import { BrowserModule } from '@angular/platform-browser';import { ScrollingModule } from '@angular/cdk/scrolling';import { AppComponent } from './app.component';@NgModule({ declarations: [AppComponent], imports: [BrowserModule, ScrollingModule], bootstrap: [AppComponent]})export class AppModule {}

Virtual Scroll should be implementation

Virtual Scroll should be implemented within a component using <cdk-virtual-scroll-viewport> wrapper.

Virtual scrolling becomes available when using the <cdk-virtual-scroll-viewport> component.

import { Component } from '@angular/core';@Component({ selector: 'app-virtual-scroll', template: ` <cdk-virtual-scroll-viewport itemSize="50" class="viewport"> <div *cdkVirtualFor="let item of items" class="item">{{ item }}</div> </cdk-virtual-scroll-viewport> `, styles: [ `.viewport { height: 400px; width: 300px; overflow: auto; border: 1px solid #ccc; } .item { padding: 10px; border-bottom: 1px solid #ddd; }` ]})export class VirtualScrollComponent { items = Array.from({ length: 1000 }, (_, i) => `Item #${i + 1}`);}

Add Component to template

Add the virtual scroll component into your template structure.

The virtual scrolling component should be included within your template.

<app-virtual-scroll></app-virtual-scroll>

Conclusion

Angular performance greatness comes from the @angular/cdk feature that renders visible items exclusively. The feature works well with extensive data in list-based and graphical interfaces.

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