Check if the <ion-content> in Angular Ionic has reached the bottom when scrolling

I'm in the process of developing a messaging app using Angular and Ionic. I want to trigger the scrollToBottom method only when it is scrolled to the very bottom. This way, if someone scrolls to the top to read old messages while their partner sends a new message, they won't be automatically redirected to the bottom each time.

I have checked out the documentation here: https://ionicframework.com/docs/api/content but unfortunately, I couldn't find any information that could help me solve this issue.

Answer №1

If you're looking to determine when the bottom has been reached while scrolling, you can use a code snippet like the following:

Below is an example code snippet that demonstrates how this can be achieved:

Note: The solution provided utilizes Angular 9 and Ionic 5.

<ion-content
  [scrollEvents]="true"
  (ionScroll)="scrolling($event)"
>
  <ion-list>
    <ion-item *ngFor="let item of items">
      <ion-label>Pokémon Yellow</ion-label>
    </ion-item>
  </ion-list>
</ion-content>

  import { IonContent } from '@ionic/angular';

  @ViewChild(IonContent) content: IonContent;

  ngOnInit() {
    // populate a list of items for displaying scroll
    this.generateNumItems(100);
    setTimeout(() => {
      // scroll to bottom after 2 seconds
      this.scrollToBottom();
    }, 2000);
  }

  generateNumItems(number) {
    for (let i = 0; i < number; i++) {
      this.items.push(i);
    }
  }

  scrolling(event: any) { // event interface not used here
    this.detectBottom();
  }

  scrollToBottom() {
    this.content.scrollToBottom(500);
  }

  async detectBottom() {
    const scrollElement = await this.content.getScrollElement(); // obtain scroll element
   // check if max bottom has been reached
    if (
      scrollElement.scrollTop ===
      scrollElement.scrollHeight - scrollElement.clientHeight
    ) {
      console.info('Max bottom reached!');
    }
  }

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