agent-skills/skills/vueuse-functions/references/useInfiniteScroll.md

category

category
Sensors

useInfiniteScroll

Infinite scrolling of the element.

Usage

<script setup lang="ts">
import { useInfiniteScroll } from '@vueuse/core'
import { ref, useTemplateRef } from 'vue'

const el = useTemplateRef('el')
const data = ref([1, 2, 3, 4, 5, 6])

const { reset } = useInfiniteScroll(
  el,
  () => {
    // load more
    data.value.push(...moreData)
  },
  {
    distance: 10,
    canLoadMore: () => {
      // inidicate when there is no more content to load so onLoadMore stops triggering
      // if (noMoreContent) return false
      return true // for demo purposes
    },
  }
)

function resetList() {
  data.value = []
  reset()
}
</script>

<template>
  <div ref="el">
    <div v-for="item in data">
      {{ item }}
    </div>
  </div>
  <button @click="resetList()">
    Reset
  </button>
</template>

Direction

Different scroll directions require different CSS style settings:

Direction	Required CSS
bottom (default)	No special settings required
top	display: flex; flex-direction: column-reverse;
left	display: flex; flex-direction: row-reverse;
right	display: flex;

::: warning Make sure to indicate when there is no more content to load with canLoadMore, otherwise onLoadMore will trigger as long as there is space for more content. :::

Directive Usage

<script setup lang="ts">
import { vInfiniteScroll } from '@vueuse/components'
import { ref } from 'vue'

const data = ref([1, 2, 3, 4, 5, 6])

function onLoadMore() {
  const length = data.value.length + 1
  data.value.push(...Array.from({ length: 5 }, (_, i) => length + i))
}
function canLoadMore() {
  // inidicate when there is no more content to load so onLoadMore stops triggering
  // if (noMoreContent) return false
  return true // for demo purposes
}
</script>

<template>
  <div v-infinite-scroll="onLoadMore">
    <div v-for="item in data" :key="item">
      {{ item }}
    </div>
  </div>

  <!-- with options -->
  <div v-infinite-scroll="[onLoadMore, { distance: 10, canLoadMore }]">
    <div v-for="item in data" :key="item">
      {{ item }}
    </div>
  </div>
</template>

Type Declarations

type InfiniteScrollElement =
  | HTMLElement
  | SVGElement
  | Window
  | Document
  | null
  | undefined
export interface UseInfiniteScrollOptions<
  T extends InfiniteScrollElement = InfiniteScrollElement,
> extends UseScrollOptions {
  /**
   * The minimum distance between the bottom of the element and the bottom of the viewport
   *
   * @default 0
   */
  distance?: number
  /**
   * The direction in which to listen the scroll.
   *
   * @default 'bottom'
   */
  direction?: "top" | "bottom" | "left" | "right"
  /**
   * The interval time between two load more (to avoid too many invokes).
   *
   * @default 100
   */
  interval?: number
  /**
   * A function that determines whether more content can be loaded for a specific element.
   * Should return `true` if loading more content is allowed for the given element,
   * and `false` otherwise.
   */
  canLoadMore?: (el: T) => boolean
}
/**
 * Reactive infinite scroll.
 *
 * @see https://vueuse.org/useInfiniteScroll
 */
export declare function useInfiniteScroll<T extends InfiniteScrollElement>(
  element: MaybeRefOrGetter<T>,
  onLoadMore: (
    state: UnwrapNestedRefs<ReturnType<typeof useScroll>>,
  ) => Awaitable<void>,
  options?: UseInfiniteScrollOptions<T>,
): {
  isLoading: ComputedRef<boolean>
  reset(): void
}