Usage

Installation

To install ngx-scrollbar, along with its dependency @angular/cdk, you can use npm:

npm i ngx-scrollbar @angular/cdk

Usage

After installation, import NgScrollbarModule into your component imports:

import { NgScrollbarModule } from 'ngx-scrollbar';

@Component({
  standalone: true,
  selector: 'app-root',
  templateUrl: './app.html',
  imports: [
    NgScrollbarModule
  ]
})

Then, in your component template, you can use the <ng-scrollbar> to wrap your content:

<ng-scrollbar>
  <!-- content goes here -->
</ng-scrollbar>

NgScrollbar API

<ng-scrollbar> has the following are the inputs / outputs:

Name	Default value	Description
[orientation]	auto	The scroll axis of the viewport horizontal, vertical, auto.
[position]	native	Invert scrollbar position native,invertX,invertY, invertAll.
[visibility]	native	Scrollbar visibility native, hover, always.
[appearance]	standard	Scrollbar appearance standard, compact.
[trackClass]	null	Add a class to scrollbars' tracks.
[thumbClass]	null	Add a class to scrollbars' thumbnails.
[buttonClass]	null	Add a class to scrollbar button elements.
[buttons]	false	Show scrollbar buttons.
[trackClickDuration]	50	The smooth scroll step duration when a scrollbar is clicked in ms.
[minThumbSize]	20	The minimum scrollbar thumb size in px.
[sensorThrottleTime]	0	The throttle time used for detecting size changes.
[disableSensor]	false	Whether ResizeObserver is disabled.
[disableInteraction]	false	Disables scrollbar interaction like dragging thumb and jumping by track click.
(afterInit)	-	Output that emits after the scrollbar component is initialized.
(afterUpdate)	-	Output that emits after the scrollbar component is updated.
update()		Trigger a re-calculation to update the scrollbar.
scrollTo(options)		Scroll function that returns a promise that resolves when scroll is reached.
scrollToElement(target, options?)		Scroll function that returns a promise that resolves when scroll is reached.

---

Advanced usage: select a custom viewport element

The externalViewport directve allows you to designate another element as the viewport, you can select an external viewport using the scrollViewport directive.

Example using scrollViewport directive:

<ng-scrollbar externalViewport>
  <div scrollViewport>
     <!-- content goes here -->
  </div>
</ng-scrollbar>

If viewport element is inaccessible from the template, you can pass its selector as the directive value [externalViewport]=".my-custom-viewport".

Example of passing viewport selector:

<ng-scrollbar externalViewport=".my-custom-viewport">
  <div class="my-custom-viewport">
     <!-- content goes here -->
  </div>
</ng-scrollbar>

By default a content wrapper element will be created inside the viewport to hold its content. optionally, you can select a custom content wrapper using the input [externalContentWrapper]

Example of passing content wrapper selector:

<ng-scrollbar externalViewport=".my-custom-viewport"
              externalContentWrapper=".my-custom-content-wrapper">
  <div class="my-custom-viewport">
    <div class="my-custom-content-wrapper">
       <!-- content goes here -->
    </div>
  </div>
</ng-scrollbar>

This capability enables integration of the scrollbar with 3rd-party libraries where the viewport or content wrapper elements are inaccessible from the template.

NgScrollbarExt API

<ng-scrollbar externalViewport> extends <ng-scrollbar> with the following inputs:

Name	Default value	Description
[externalViewport]	null	External viewport selector.
[externalContentWrapper]	null	External content wrapper selector.
[externalSpacer]	null	External spacer selector used for calculating content dimensions instead of using the content wrapper (useful for virtual scroll libraries).