使用React-Window实现虚拟滚动效果的示例代码

npm install react-window

import { FixedSizeList as List } from 'react-window';

const MyList = () => (
    <List
        height={150}
        itemCount={1000}
        itemSize={35}
        width={300}
    >
        {({ index, style }) => <div style={style}>Item {index}</div>}
    </List>
);

import { FixedSizeList as List } from 'react-window';

// 偶数和奇数项组件
const EvenItem = ({ index }) => <div>Even: Item {index}</div>;
const OddItem = ({ index }) => <div>Odd: Item {index}</div>;

const MyCustomItem = ({ index, style }) => (
    <div style={style}>
        {index % 2 === 0 ? <EvenItem index={index} /> : <OddItem index={index} />}
    </div>
);

const MyList = () => (
    <List
        height={150}
        itemCount={1000}
        itemSize={35}
        width={300}
    >
        {MyCustomItem}
    </List>
);

import { InfiniteLoader, List } from "react-window-infinite-loader";

const loadMoreItems = /* 加载更多项目的函数 */

<InfiniteLoader
    isItemLoaded={/* 检查项目是否加载的函数 */}
    itemCount={1000}
    loadMoreItems={loadMoreItems}
>
    {({ onItemsRendered, ref }) => (
        <List
            onItemsRendered={onItemsRendered}
            ref={ref}
            {/* 其他属性 */}
        >
            {/* 项目渲染器 */}
        </List>
    )}
</InfiniteLoader>

// 使用相同的 FixedSizeList 示例，但使用大量数据集
<List
    height={150}
    itemCount={100000}
    itemSize={35}
    width={300}
>
    {({ index, style }) => <div style={style}>Item {index}</div>}
</List>

 express = require('express');
const app = express();
const cors = require('cors');
const PORT = 3000;

app.use(cors());
// 模拟数据数组
const data = new Array(1000).fill(null).map((_, index) => ({ id: index, name: `Item ${index}` }));

// 获取分页数据的端点
app.get('/data', (req, res) => {
    const { page = 1, limit = 50 } = req.query;
    console.log('req.query:', req.query)
    const startIndex = (page - 1) * limit;
    const endIndex = page * limit;
    res.json({
        data: data.slice(startIndex, endIndex),
        total: data.length
    });
});

app.listen(PORT, () => console.log(`Server running on port ${PORT}`));

import React, { useState, useEffect } from 'react';
import { FixedSizeList as List } from 'react-window';
import axios from 'axios';

const ROW_HEIGHT = 35;

function InfiniteLoadingList() {
    const [items, setItems] = useState([]);
    const [total, setTotal] = useState(0);
    const [page, setPage] = useState(1);

    const loadMoreItems = async () => {
        const { data } = await axios.get(`http://localhost:3000/data?page=${page}&limit=50`);
        setItems(prev => [...prev, ...data.data]);
        setTotal(data.total);
        setPage(prev => prev + 1);
    };

    useEffect(() => {
        loadMoreItems();
    }, []);

    useEffect(() => {
        console.log('items', items);
    }, [items]);

    const isItemLoaded = index => index < items.length;

    const renderItem = ({ index, style }) => (
        <div style={style}>
            {isItemLoaded(index) ? items[index].name : 'Loading...'}
        </div>
    );

    return (
        <List
            height={400}
            itemCount={total}
            itemSize={ROW_HEIGHT}
            width={300}
            onItemsRendered={({ visibleStopIndex }) => {
            console.log('visibleStopIndex:', visibleStopIndex)
                if (!isItemLoaded(visibleStopIndex) && items.length < total) {
                    loadMoreItems();
                }
            }}
        >
            {renderItem}
        </List>
    );
}

export default InfiniteLoadingList;