ion-infinite-scroll

The Infinite Scroll component calls an action to be performed when the user scrolls a specified distance from the bottom or top of the page.

The expression assigned to the ionInfinite event is called when the user reaches that defined distance. When this expression has finished any and all tasks, it should call the complete() method on the infinite scroll instance.

Infinite Scroll Content

The ion-infinite-scroll component has the infinite scroll logic. It requires a child component in order to display content. Ionic uses its ion-infinite-scroll-content component by default. This component displays the infinite scroll and changes the look depending on the infinite scroll's state. It displays a spinner that looks best based on the platform the user is on. However, the default spinner can be changed and text can be added by setting properties on the ion-infinite-scroll-content component.

Custom Content

Separating the ion-infinite-scroll and ion-infinite-scroll-content components allows developers to create their own content components, if desired. This content can contain anything, from an SVG element to elements with unique CSS animations.

Usage

ANGULAR

<ion-content>
  <ion-button (click)="toggleInfiniteScroll()" expand="block"> Toggle Infinite Scroll </ion-button>

  <ion-list></ion-list>

  <ion-infinite-scroll threshold="100px" (ionInfinite)="loadData($event)">
    <ion-infinite-scroll-content loadingSpinner="bubbles" loadingText="Loading more data...">
    </ion-infinite-scroll-content>
  </ion-infinite-scroll>
</ion-content>

import { Component, ViewChild } from '@angular/core';
import { IonInfiniteScroll } from '@ionic/angular';

@Component({
  selector: 'infinite-scroll-example',
  templateUrl: 'infinite-scroll-example.html',
  styleUrls: ['./infinite-scroll-example.css'],
})
export class InfiniteScrollExample {
  @ViewChild(IonInfiniteScroll) infiniteScroll: IonInfiniteScroll;

  constructor() {}

  loadData(event) {
    setTimeout(() => {
      console.log('Done');
      event.target.complete();

      // App logic to determine if all data is loaded
      // and disable the infinite scroll
      if (data.length == 1000) {
        event.target.disabled = true;
      }
    }, 500);
  }

  toggleInfiniteScroll() {
    this.infiniteScroll.disabled = !this.infiniteScroll.disabled;
  }
}

JAVASCRIPT

<ion-content>
  <ion-button onClick="toggleInfiniteScroll()" expand="block"> Toggle Infinite Scroll </ion-button>

  <ion-list></ion-list>

  <ion-infinite-scroll threshold="100px" id="infinite-scroll">
    <ion-infinite-scroll-content loading-spinner="bubbles" loading-text="Loading more data...">
    </ion-infinite-scroll-content>
  </ion-infinite-scroll>
</ion-content>

const infiniteScroll = document.getElementById('infinite-scroll');

infiniteScroll.addEventListener('ionInfinite', function (event) {
  setTimeout(function () {
    console.log('Done');
    event.target.complete();

    // App logic to determine if all data is loaded
    // and disable the infinite scroll
    if (data.length == 1000) {
      event.target.disabled = true;
    }
  }, 500);
});

function toggleInfiniteScroll() {
  infiniteScroll.disabled = !infiniteScroll.disabled;
}

STENCIL

import { Component, State, h } from '@stencil/core';

@Component({
  tag: 'infinite-scroll-example',
  styleUrl: 'infinite-scroll-example.css',
})
export class InfiniteScrollExample {
  private infiniteScroll: HTMLIonInfiniteScrollElement;

  @State() data = [];

  componentWillLoad() {
    this.pushData();
  }

  pushData() {
    const max = this.data.length + 20;
    const min = max - 20;

    for (var i = min; i < max; i++) {
      this.data.push('Item ' + i);
    }

    // Stencil does not re-render when pushing to an array
    // so create a new copy of the array
    // https://stenciljs.com/docs/reactive-data#handling-arrays-and-objects
    this.data = [...this.data];
  }

  loadData(ev) {
    setTimeout(() => {
      this.pushData();
      console.log('Loaded data');
      ev.target.complete();

      // App logic to determine if all data is loaded
      // and disable the infinite scroll
      if (this.data.length == 1000) {
        ev.target.disabled = true;
      }
    }, 500);
  }

  toggleInfiniteScroll() {
    this.infiniteScroll.disabled = !this.infiniteScroll.disabled;
  }

  render() {
    return [
      <ion-content>
        <ion-button onClick={() => this.toggleInfiniteScroll()} expand="block">
          Toggle Infinite Scroll
        </ion-button>

        <ion-list>
          {this.data.map((item) => (
            <ion-item>
              <ion-label>{item}</ion-label>
            </ion-item>
          ))}
        </ion-list>

        <ion-infinite-scroll ref={(el) => (this.infiniteScroll = el)} onIonInfinite={(ev) => this.loadData(ev)}>
          <ion-infinite-scroll-content
            loadingSpinner="bubbles"
            loadingText="Loading more data..."
          ></ion-infinite-scroll-content>
        </ion-infinite-scroll>
      </ion-content>,
    ];
  }
}

VUE

<template>
  <ion-page>
    <ion-content class="ion-padding">
      <ion-button @click="toggleInfiniteScroll" expand="block"> Toggle Infinite Scroll </ion-button>

      <ion-list>
        <ion-item v-for="item in items" :key="item">
          <ion-label>{{ item }}</ion-label>
        </ion-item>
      </ion-list>

      <ion-infinite-scroll
        @ionInfinite="loadData($event)"
        threshold="100px"
        id="infinite-scroll"
        :disabled="isDisabled"
      >
        <ion-infinite-scroll-content loading-spinner="bubbles" loading-text="Loading more data...">
        </ion-infinite-scroll-content>
      </ion-infinite-scroll>
    </ion-content>
  </ion-page>
</template>

<script lang="ts">
  import {
    IonButton,
    IonContent,
    IonInfiniteScroll,
    IonInfiniteScrollContent,
    IonItem,
    IonLabel,
    IonList,
    IonPage,
  } from '@ionic/vue';
  import { defineComponent, ref } from 'vue';

  export default defineComponent({
    components: {
      IonButton,
      IonContent,
      IonInfiniteScroll,
      IonInfiniteScrollContent,
      IonItem,
      IonLabel,
      IonList,
      IonPage,
    },
    setup() {
      const isDisabled = ref(false);
      const toggleInfiniteScroll = () => {
        isDisabled.value = !isDisabled.value;
      };
      const items = ref([]);
      const pushData = () => {
        const max = items.value.length + 20;
        const min = max - 20;
        for (let i = min; i < max; i++) {
          items.value.push(i);
        }
      };

      const loadData = (ev: CustomEvent) => {
        setTimeout(() => {
          pushData();
          console.log('Loaded data');
          ev.target.complete();

          // App logic to determine if all data is loaded
          // and disable the infinite scroll
          if (items.value.length == 1000) {
            ev.target.disabled = true;
          }
        }, 500);
      };

      pushData();

      return {
        isDisabled,
        toggleInfiniteScroll,
        loadData,
        items,
      };
    },
  });
</script>

Properties

disabled

Description	If true, the infinite scroll will be hidden and scroll event listeners will be removed. Set this to true to disable the infinite scroll from actively trying to receive new data while scrolling. This is useful when it is known that there is no more data that can be added, and the infinite scroll is no longer needed.
Attribute	disabled
Type	boolean
Default	false

position

Description	The position of the infinite scroll element. The value can be either top or bottom.
Attribute	position
Type	"bottom" \| "top"
Default	'bottom'

threshold

Description	The threshold distance from the bottom of the content to call the infinite output event when scrolled. The threshold value can be either a percent, or in pixels. For example, use the value of 10% for the infinite output event to get called when the user has scrolled 10% from the bottom of the page. Use the value 100px when the scroll is within 100 pixels from the bottom of the page.
Attribute	threshold
Type	string
Default	'15%'

Events

Name	Description
ionInfinite	Emitted when the scroll reaches

the threshold distance. From within your infinite handler, you must call the infinite scroll's complete() method when your async operation has completed. |

Methods

complete

Description

Call complete() within the ionInfinite output event handler when your async operation has completed. For example, the loading state is while the app is performing an asynchronous operation, such as receiving more data from an AJAX request to add more items to a data list. Once the data has been received and UI updated, you then call this method to signify that the loading has completed. This method will change the infinite scroll's state from loading to enabled.

Signature

complete() => Promise<void>