Infinite Scrolling in React.js

InfiniteScroller.js

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

const InfiniteScroll = () => {
  const [data, setData] = useState([]);
  const [page, setPage] = useState(1); // Track current page
  const [loading, setLoading] = useState(false); // Track loading state

  const fetchData = async () => {
    setLoading(true); // Set loading state
    try {
      // Replace with your API endpoint
      const response = await fetch(`https://api.example.com/data?page=${page}`);
      const newData = await response.json();
      setData(prevData => [...prevData, ...newData]); // Append new data to existing data
      setPage(prevPage => prevPage + 1); // Increment page count
    } catch (error) {
      console.error('Error fetching data:', error);
    } finally {
      setLoading(false); // Reset loading state
    }
  };

  useEffect(() => {
    fetchData(); // Initial data fetch
  }, []); // Runs once after initial render

  const handleScroll = () => {
    if (
      window.innerHeight + document.documentElement.scrollTop !==
      document.documentElement.offsetHeight || loading
    )
      return;
    fetchData();
  };

  useEffect(() => {
    window.addEventListener('scroll', handleScroll);
    return () => window.removeEventListener('scroll', handleScroll);
  }, []); // Add and remove scroll event listener

  return (
    <div>
      <ul>
        {data.map(item => (
          <li key={item.id}>{item.title}</li>
        ))}
      </ul>
      {loading && <p>Loading...</p>}
    </div>
  );
};

export default InfiniteScroll;