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vue 实现下拉加载

2026-01-22 03:34:34VUE

使用 Intersection Observer API 实现下拉加载

在 Vue 中可以通过 Intersection Observer API 监听元素是否进入视口，触发加载更多数据。这种方法性能较好，无需频繁计算滚动位置。

<template>
  <div>
    <div v-for="item in list" :key="item.id">{{ item.content }}</div>
    <div ref="loader" class="loader">Loading...</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      list: [],
      page: 1,
      isLoading: false
    }
  },
  mounted() {
    this.initObserver()
    this.loadData()
  },
  methods: {
    initObserver() {
      const observer = new IntersectionObserver((entries) => {
        if (entries[0].isIntersecting && !this.isLoading) {
          this.loadMore()
        }
      })
      observer.observe(this.$refs.loader)
    },
    async loadData() {
      this.isLoading = true
      const newData = await fetchData(this.page)
      this.list = [...this.list, ...newData]
      this.isLoading = false
    },
    loadMore() {
      this.page++
      this.loadData()
    }
  }
}
</script>

<style>
.loader {
  height: 50px;
  text-align: center;
}
</style>

使用滚动事件监听实现

传统方法通过监听滚动事件，计算滚动位置来判断是否到达底部。

<template>
  <div ref="scrollContainer" @scroll="handleScroll">
    <div v-for="item in list" :key="item.id">{{ item.content }}</div>
    <div v-if="isLoading">Loading...</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      list: [],
      page: 1,
      isLoading: false
    }
  },
  mounted() {
    this.loadData()
  },
  methods: {
    handleScroll() {
      const container = this.$refs.scrollContainer
      const scrollBottom = container.scrollTop + container.clientHeight
      if (scrollBottom >= container.scrollHeight - 100 && !this.isLoading) {
        this.loadMore()
      }
    },
    async loadData() {
      this.isLoading = true
      const newData = await fetchData(this.page)
      this.list = [...this.list, ...newData]
      this.isLoading = false
    },
    loadMore() {
      this.page++
      this.loadData()
    }
  }
}
</script>

使用第三方库 vue-infinite-loading

对于快速实现，可以使用专门的下拉加载库。

安装：

npm install vue-infinite-loading

使用：

<template>
  <div>
    <div v-for="item in list" :key="item.id">{{ item.content }}</div>
    <infinite-loading @infinite="loadData"></infinite-loading>
  </div>
</template>

<script>
import InfiniteLoading from 'vue-infinite-loading'

export default {
  components: {
    InfiniteLoading
  },
  data() {
    return {
      list: [],
      page: 1
    }
  },
  methods: {
    async loadData($state) {
      try {
        const newData = await fetchData(this.page)
        if (newData.length) {
          this.list = [...this.list, ...newData]
          this.page++
          $state.loaded()
        } else {
          $state.complete()
        }
      } catch (error) {
        $state.error()
      }
    }
  }
}
</script>