Now supports Angular 10+

ngx-scroll-event

An Angular 2+ directive to emit an event if scroll occurs on an element or window.

Features

• Detect scroll on an element or window and emits an event, also calculates if the user is reaching the top/bottom of that element or not.

Install

• With NPM

npm install ngx-scroll-event --save

• With Yarn

yarn add ngx-scroll-event

Usage

Import ScrollEvent and add it to the imports array of your module.

// app.module.ts
import { NgxScrollEventModule } from 'ngx-scroll-event';

@NgModule({
  imports: [
    ...,
    NgxScrollEventModule,
    ...,
  ]
})
export class AppModule { }

In your template you may now add the libScrollEvent attribute and (onscroll) event to any element. you can also add [bottomOffset] or [topOffset] to change when reaching bottom or top detection, bot values defaults to 100px, the value should be a number in pixels.

// app.awesome.component.ts

...
import { NgxScrollEvent } from 'ngx-scroll-event';
...

@Component({
   ...
   template: `...
        <div libScrollEvent (onscroll)="handleScroll($event)" [bottomOffset]="200" [topOffset]="200" >
            <div>Bla bla bla</div>
            <div>Bla bla bla</div>
            <div>Bla bla bla</div>
            <div>Bla bla bla</div>
            <div>Bla bla bla</div>
            <div>Bla bla bla</div>
            <div>Bla bla bla</div>
            <div>Bla bla bla</div>
            <div>Bla bla bla</div>
        <div>
   ...`,
})
export class AwesomeComponent {
  public handleScroll(event: NgxScrollEvent) {
    console.log('scroll occurred', event.originalEvent);
    if (event.isReachingBottom) {
      console.log(`the user is reaching the bottom`);
    }
    if (event.isReachingTop) {
      console.log(`the user is reaching the top`);
    }
    if (event.isWindowEvent) {
      console.log(`This event is fired on Window not on an element.`);
    }

  }
}

Code scaffolding

Run ng generate component component-name --project ngx-scroll-event to generate a new component. You can also use ng generate directive|pipe|service|class|guard|interface|enum|module --project ngx-scroll-event.

Note: Don't forget to add --project ngx-scroll-event or else it will be added to the default project in your angular.json file.

Build

Run ng build ngx-scroll-event to build the project. The build artifacts will be stored in the dist/ directory.

Publishing

After building your library with ng build ngx-scroll-event, go to the dist folder cd dist/ngx-scroll-event and run npm publish.

Running unit tests

Run ng test ngx-scroll-event to execute the unit tests via Karma.

Further help

To get more help on the Angular CLI use ng help or go check out the Angular CLI README.