useVirtualList

::: warning Consider using @tanstack/vue-virtual instead, if you are looking for more features. :::

Create virtual lists with ease. Virtual lists (sometimes called virtual scrollers) allow you to render a large number of items performantly. They only render the minimum number of DOM nodes necessary to show the items within the container element by using the wrapper element to emulate the container element's full height.

Usage

Simple list

import { useVirtualList } from '@vueuse/core'

const { list, containerProps, wrapperProps } = useVirtualList(
  Array.from(Array.from({ length: 99999 }).keys()),
  {
    // Keep `itemHeight` in sync with the item's row.
    itemHeight: 22,
  },
)

Config

State	Type	Description
itemHeight	`number`	ensure that the total height of the `wrapper` element is calculated correctly.*
itemWidth	`number`	ensure that the total width of the `wrapper` element is calculated correctly.*
overscan	`number`	number of pre-rendered DOM nodes. Prevents whitespace between items if you scroll very quickly.

* The itemHeight or itemWidth must be kept in sync with the height of each row rendered. If you are seeing extra whitespace or jitter when scrolling to the bottom of the list, ensure the itemHeight or itemWidth is the same height as the row.

Reactive list

import { useToggle, useVirtualList } from '@vueuse/core'
import { computed } from 'vue'

const [isEven, toggle] = useToggle()
const allItems = Array.from(Array.from({ length: 99999 }).keys())
const filteredList = computed(() => allItems.filter(i => isEven.value ? i % 2 === 0 : i % 2 === 1))

const { list, containerProps, wrapperProps } = useVirtualList(
  filteredList,
  {
    itemHeight: 22,
  },
)

vue

<template>
  <p>Showing {{ isEven ? 'even' : 'odd' }} items</p>
  <button @click="toggle">
    Toggle Even/Odd
  </button>
  <div v-bind="containerProps" style="height: 300px">
    <div v-bind="wrapperProps">
      <div v-for="item in list" :key="item.index" style="height: 22px">
        Row: {{ item.data }}
      </div>
    </div>
  </div>
</template>

Horizontal list

import { useVirtualList } from '@vueuse/core'

const allItems = Array.from(Array.from({ length: 99999 }).keys())

const { list, containerProps, wrapperProps } = useVirtualList(
  allItems,
  {
    itemWidth: 200,
  },
)

vue

<template>
  <div v-bind="containerProps" style="height: 300px">
    <div v-bind="wrapperProps">
      <div v-for="item in list" :key="item.index" style="width: 200px">
        Row: {{ item.data }}
      </div>
    </div>
  </div>
</template>

Component Usage

vue

<template>
  <UseVirtualList :list="list" :options="options" height="300px">
    <template #default="props">
      <!-- you can get current item of list here -->
      <div style="height: 22px">
        Row {{ props.index }} {{ props.data }}
      </div>
    </template>
  </UseVirtualList>
</template>

To scroll to a specific element, the component exposes scrollTo(index: number) => void.