react-infinite-observer

react-infinite-observer

Check live StoryBook demo

Overview

React Infinite Observer is a lightweight React hook for handling infinite scrolling in your web applications. It enables you to efficiently load and display large sets of data by triggering requests as the user scrolls down/up the page.

Features

• Infinite Scrolling: Load more data automatically as the user scrolls down/up the page.
• Easy Integration: Simple integration into your existing React components.
• Flexibility: Customize the trigger point for fetching more data and loading indicator appearance.
• Full Manual Control: The hook provides option to autofetch data without scolling until height of list > screen height

Getting Started

Installation

npm install react-infinite-observer

or

yarn add react-infinite-observer

Usage

Static Ref

import { FC, useState, useCallback, useEffect } from 'react';
import { useInfiniteObserver } from 'react-infinite-observer';

export const App: FC = () => {
  const [items, setItems] = useState([]);
  const [isLoading, setIsLoading] = useState(false);
  const [page, setPage] = useState(1);

  const onIntersection = useCallback(() => {
    setPage((pageNo) => pageNo + 1);
  }, []);

  const [setRefElement] = useInfiniteObserver(onIntersection);

  const fetchData = async () => {
    // Fetch more data and update state
    setIsLoading(true);
    // ... fetch data logic
    setIsLoading(false);
  };

  useEffect(() => {
    fetchData();
  }, [page]);

  return (
    <div>
      <ul>
        {items.map((item) => (
          <li key={`${item.id.name}-${item.id.value}-${item.login.uuid}`}>
            {item.name.last}
          </li>
        ))}
        <div ref={setRefElement}></div>
      </ul>
      {isLoading && <p>Loading...</p>}
    </div>
  );
};

Dynamic Ref (keep fetching data until screen is filled)

import { FC, useState, useCallback, useEffect } from 'react';
import { useInfiniteObserver } from 'react-infinite-observer';

export const App: FC = () => {
  const [items, setItems] = useState([]);
  const [isLoading, setIsLoading] = useState(false);
  const [page, setPage] = useState(1);

  const onIntersection = useCallback(() => {
    setPage((pageNo) => pageNo + 1);
  }, []);

  const [setRefElement] = useInfiniteObserver(onIntersection);

  const fetchData = async () => {
    // Fetch more data and update state
    setIsLoading(true);
    // ... fetch data logic
    setIsLoading(false);
  };

  useEffect(() => {
    fetchData();
  }, [page]);

  return (
    <div>
      <ul>
        {items.map((item, index) => (
          <li
            key={`${item.id.name}-${item.id.value}-${item.login.uuid}`}
            ref={index === items.length - 1 ? setRefElement : undefined}
          >
            {item.name.last}
          </li>
        ))}
      </ul>
      {isLoading && <p>Loading...</p>}
    </div>
  );
};

API

infiniteObserverOptions

Provide these as the options argument in the useInfiniteObserver hook.

Name	Type	Default	Description
threshold	number	1	Number between 0 and 1 indicating the percentage that should be visible before triggering.
onIntersection	() => void	undefined	Call this function whenever the Ref Element is in view for the first time.

Example

Check out the stackblitz snippet for a simple implementation.

License

This project is licensed under the MIT License - see the LICENSE file for details.