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vue实现上拉加载

2026-01-23 01:26:12VUE

Vue 实现上拉加载

使用 Intersection Observer API

Intersection Observer API 可以监听元素是否进入视口，适合实现上拉加载。

<template>
  <div>
    <div v-for="item in list" :key="item.id">{{ item.content }}</div>
    <div ref="loader" v-if="!isLoading && hasMore">加载更多...</div>
    <div v-if="isLoading">加载中...</div>
  </div>
</template>

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

使用滚动事件监听

通过监听滚动事件，计算滚动位置触发加载。

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

<script>
export default {
  data() {
    return {
      list: [],
      isLoading: false,
      hasMore: true,
      page: 1
    };
  },
  mounted() {
    this.loadData();
  },
  methods: {
    handleScroll() {
      const container = this.$refs.container;
      const scrollBottom = container.scrollHeight - container.scrollTop - container.clientHeight;
      if (scrollBottom < 50 && !this.isLoading && this.hasMore) {
        this.loadData();
      }
    },
    async loadData() {
      this.isLoading = true;
      try {
        const newData = await fetchData(this.page);
        this.list = [...this.list, ...newData];
        this.page++;
        this.hasMore = newData.length > 0;
      } catch (error) {
        console.error(error);
      } finally {
        this.isLoading = false;
      }
    }
  }
};
</script>

使用第三方库

Vue-infinite-loading 是一个专门用于无限滚动的 Vue 插件。

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);
        this.list = [...this.list, ...newData];
        this.page++;
        if (newData.length) {
          $state.loaded();
        } else {
          $state.complete();
        }
      } catch (error) {
        $state.error();
      }
    }
  }
};
</script>