How to implement infinite scroll in next js?

Unlike in normal React Js, infinite scrolling in NextJs has a different approach. Here we will be using an npm package called react-infinite-scroll-component.

Let's see the index.js file index.js

import Content from "./Content";

export default function index(props) {
  return (
    <>
      <div>
        <Content data={props.data} />
      </div>
    </>
  );
}

export const getStaticProps = async () => {
  const data = await fetch(
    "https://jsonplaceholder.typicode.com/todos?_limit=10"
  ).then((response) => response.json());
  return {
    props: { data }
  };
};

In the above code, you can see that we are fetching data from getStaticProps, which returns the json data as props, and we are receiving that prop and passing it to the component. If you observe carefully, we are limiting the initial rendering to 10, so, first 10 data will be shown and then we'll again fetch data from the server.

Now, let's see the content page Content.js

import React, { useState } from "react";
import InfiniteScroll from "react-infinite-scroll-component";

const Content = ({ data }) => {
  const [posts, setPosts] = useState(data);
  const [hasMore, setHasMore] = useState(true);

  const getMorePost = async () => {
    const res = await fetch(
      `https://jsonplaceholder.typicode.com/todos?_start=${posts.length}&_limit=10`
    );
    const newPosts = await res.json();
    setPosts((post) => [...post, ...newPosts]);
  };

  return (
    <>
      <InfiniteScroll
        dataLength={posts.length}
        next={getMorePost}
        hasMore={hasMore}
        loader={<h3> Loading...</h3>}
        endMessage={<h4>Nothing more to show</h4>}
      >
        {posts.map((data) => (
          <div key={data.id}>
            <div className="back">
              <strong> {data.id}</strong> {data.title}
            </div>
            {data.completed}
          </div>
        ))}
      </InfiniteScroll>
      <style jsx>
        {`
          .back {
            padding: 10px;
            background-color: dodgerblue;
            color: white;
            margin: 10px;
          }
        `}
      </style>
    </>
  );
};

export default Content;

Here we are getting more posts from the server after all the data loads. The code is self-explanatory.

setPosts((post) => [...post, ...newPosts]);

With the above state, we are appending the previous data to the incoming data

You can check this code sandbox for the visual of how it is actually working.

https://codesandbox.io/s/next-js-infinite-scroll-3vfem

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