将某容器的滚动条进行监听，常用于加载更多数据

ngx-scroll-event

用于Angular2+监听滚动条的指令和事件

Install

$ npm install ngx-scroll-event --save

$ yarn add ngx-scroll-event

使用

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

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

// app.awesome.component.ts

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

@Component({
   ...
   template: `...
        <div detect-scroll (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: ScrollEvent) {
    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.`);
    }

  }
}