useInfiniteScroll

分类

传感器

导出大小

2.86 kB

上次更改

8 个月前

元素的无限滚动。

演示

源代码演练场 (beta)

用法

vue

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

const el
 = useTemplateRef
<HTMLElement>('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>

方向

不同的滚动方向需要不同的 CSS 样式设置

方向	所需 CSS
`bottom` (默认)	无需特殊设置
`top`	`display: flex;` `flex-direction: column-reverse;`
`left`	`display: flex;` `flex-direction: row-reverse;`
`right`	`display: flex;`

警告

请务必在没有更多内容可加载时通过 canLoadMore 进行指示，否则只要有空间容纳更多内容，onLoadMore 就会触发。

指令用法

此函数还通过 @vueuse/components 包提供了一个指令版本。了解更多用法。

vue

<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-scro
ll="onLoadMore
">
    <div
 v-for="item
 in data
" :key
="item
">
      {{ item
 }}
    </div
>
  </div
>

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

类型声明

显示类型声明

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.cn/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
}