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react无限滚动列表实现

2026-01-27 12:39:29React

无限滚动列表实现方法

无限滚动列表（Infinite Scroll）是一种常见的UI模式，通过监听滚动事件动态加载更多数据，避免一次性渲染大量DOM节点。React中可通过以下方法实现：

使用Intersection Observer API

Intersection Observer是现代浏览器提供的API，可高效检测元素是否进入视口。

import { useState, useEffect, useRef } from 'react';

function InfiniteScrollList({ fetchData }) {
  const [items, setItems] = useState([]);
  const [page, setPage] = useState(1);
  const loaderRef = useRef(null);

  useEffect(() => {
    const observer = new IntersectionObserver((entries) => {
      if (entries[0].isIntersecting) {
        loadMore();
      }
    });

    if (loaderRef.current) {
      observer.observe(loaderRef.current);
    }

    return () => observer.disconnect();
  }, []);

  const loadMore = async () => {
    const newItems = await fetchData(page);
    setItems(prev => [...prev, ...newItems]);
    setPage(prev => prev + 1);
  };

  return (
    <div>
      {items.map(item => (
        <div key={item.id}>{item.content}</div>
      ))}
      <div ref={loaderRef}>Loading more...</div>
    </div>
  );
}

使用滚动事件监听

传统方法通过监听滚动事件计算位置，需注意性能优化。

import { useState, useEffect } from 'react';

function InfiniteScrollList({ fetchData }) {
  const [items, setItems] = useState([]);
  const [page, setPage] = useState(1);
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    window.addEventListener('scroll', handleScroll);
    return () => window.removeEventListener('scroll', handleScroll);
  }, [items]);

  const handleScroll = () => {
    if (
      window.innerHeight + document.documentElement.scrollTop >=
      document.documentElement.offsetHeight - 100 &&
      !loading
    ) {
      loadMore();
    }
  };

  const loadMore = async () => {
    setLoading(true);
    const newItems = await fetchData(page);
    setItems(prev => [...prev, ...newItems]);
    setPage(prev => prev + 1);
    setLoading(false);
  };

  return (
    <div>
      {items.map(item => (
        <div key={item.id}>{item.content}</div>
      ))}
      {loading && <div>Loading...</div>}
    </div>
  );
}

使用第三方库

现有成熟库如react-infinite-scroll-component可快速实现：

import InfiniteScroll from 'react-infinite-scroll-component';

function InfiniteScrollList({ fetchData }) {
  const [items, setItems] = useState([]);
  const [page, setPage] = useState(1);
  const [hasMore, setHasMore] = useState(true);

  const loadMore = async () => {
    const newItems = await fetchData(page);
    setItems(prev => [...prev, ...newItems]);
    setPage(prev => prev + 1);
    setHasMore(newItems.length > 0);
  };

  return (
    <InfiniteScroll
      dataLength={items.length}
      next={loadMore}
      hasMore={hasMore}
      loader={<h4>Loading...</h4>}
    >
      {items.map(item => (
        <div key={item.id}>{item.content}</div>
      ))}
    </InfiniteScroll>
  );
}