Angular Scroll View

The ScrollView is a UI component that enables a user to scroll its content. This demo shows how to display the scrollbar within a container and how to update the ScrollView content.

Backend API

<div id="scrollview-demo"> <dx-scroll-view #scrollView id="scrollview" [scrollByContent]="scrollByContent" [scrollByThumb]="scrollByThumb" [showScrollbar]="scrollbarMode" [bounceEnabled]="pullDown" reachBottomText="Updating..." (onPullDown)="updateTopContent($event)" (onReachBottom)="updateBottomContent($event)" > <div id="scrollview-content" [innerHTML]="content"></div> </dx-scroll-view> <div class="options"> <div class="caption">Options</div> <div class="option"> <span>Show scrollbar:</span> <dx-select-box id="show-scrollbar-mode" [inputAttr]="{ 'aria-label': 'Show Scrollbar Mode' }" [items]="showScrollbarModes" valueExpr="value" displayExpr="text" [(value)]="scrollbarMode" > </dx-select-box> </div> <div class="option"> <dx-check-box text="Update content on the ReachBottom event" (onValueChanged)="valueChanged($event)" [value]="true" > </dx-check-box> </div> <div class="option"> <dx-check-box text="Update content on the PullDown event" [(value)]="pullDown" > </dx-check-box> </div> <div class="option"> <dx-check-box text="Scroll by content" [(value)]="scrollByContent"> </dx-check-box> </div> <div class="option"> <dx-check-box text="Scroll by thumb" [(value)]="scrollByThumb"> </dx-check-box> </div> </div> </div>

import { bootstrapApplication } from '@angular/platform-browser'; import { ChangeDetectorRef, Component, ViewChild, AfterViewInit, enableProdMode, provideZoneChangeDetection, } from '@angular/core'; import { DxSelectBoxModule } from 'devextreme-angular'; import { DxCheckBoxModule, DxCheckBoxTypes } from 'devextreme-angular/ui/check-box'; import { DxScrollViewModule, DxScrollViewComponent, DxScrollViewTypes } from 'devextreme-angular/ui/scroll-view'; import { ScrollbarMode } from 'devextreme-angular/common'; import { Service } from './app.service'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', templateUrl: './app.component.html', styleUrls: ['./app.component.css'], providers: [Service], preserveWhitespaces: true, imports: [ DxScrollViewModule, DxCheckBoxModule, DxSelectBoxModule, ], }) export class AppComponent implements AfterViewInit { @ViewChild(DxScrollViewComponent, { static: false }) scrollView: DxScrollViewComponent; showScrollbarModes: { text: string, value: ScrollbarMode }[] = [ { text: 'On Scroll', value: 'onScroll', }, { text: 'On Hover', value: 'onHover', }, { text: 'Always', value: 'always', }, { text: 'Never', value: 'never', }, ]; content: string; updateContentTimer: unknown; scrollByContent = true; scrollByThumb = true; scrollbarMode: ScrollbarMode = this.showScrollbarModes[0].value; pullDown = false; constructor(service: Service, private changeDetectorRef: ChangeDetectorRef) { this.content = service.getContent(); } ngAfterViewInit() { this.scrollView.instance.option('onReachBottom', this.updateBottomContent); } valueChanged = (data: DxCheckBoxTypes.ValueChangedEvent) => { this.scrollView.instance.option('onReachBottom', data.value ? this.updateBottomContent : null); }; updateContent = (args: DxScrollViewTypes.PullDownEvent | DxScrollViewTypes.ReachBottomEvent, eventName: string) => { const updateContentText = `<br /><div>Content has been updated on the ${eventName} event.</div><br />`; if (this.updateContentTimer) { clearTimeout(this.updateContentTimer as number); } this.updateContentTimer = setTimeout(() => { this.content = (eventName === 'PullDown' ? updateContentText + this.content : this.content + updateContentText); this.changeDetectorRef.detectChanges(); args.component.release(false); }, 500); }; updateTopContent = (e: DxScrollViewTypes.PullDownEvent) => { this.updateContent(e, 'PullDown'); }; updateBottomContent = (e: DxScrollViewTypes.ReachBottomEvent) => { this.updateContent(e, 'ReachBottom'); }; } bootstrapApplication(AppComponent, { providers: [ provideZoneChangeDetection({ eventCoalescing: true, runCoalescing: true }), ], });

::ng-deep #scrollview-demo { min-height: 550px; } ::ng-deep #scrollview { height: auto; position: absolute; top: 0; bottom: 300px; padding: 20px; } ::ng-deep #scrollview-content { white-space: pre-wrap; } .options { padding: 20px; background-color: rgba(191, 191, 191, 0.15); position: absolute; bottom: 0; left: 0; right: 0; } .caption { font-size: 18px; font-weight: 500; } .option { margin-top: 10px; } .option > span { position: relative; top: 2px; margin-right: 10px; } ::ng-deep .option > .dx-selectbox { display: inline-block; vertical-align: middle; max-width: 340px; width: 100%; }

import { Injectable } from '@angular/core'; let content = ''; @Injectable() export class Service { getContent() { for (let i = 0; i < 10; i += 1) { content += 'Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.\n\n'; } content += '<br />'; return content; } }

<!DOCTYPE html> <html 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/26.1.5/css/dx.light.css" /> </head> <body class="dx-viewport"> <div class="demo-container"> <demo-app>Loading...</demo-app> </div> <script src="https://cdn.jsdelivr.net/npm/zone.js@0.16.2/bundles/zone.umd.js"></script> <script src="./bundle.js" type="module"></script> </body> </html>