React-simple-infinite-loading NPM

react-simple-infinite-loading

Why?

I wrote an article about creating an infinite loading list with React and GraphQL. Someone pointed out the React implementation of the list was a bit complex. I figure out it was possible to write an abstraction for this particular case. Here it is!

This component aims to stay easy to use. If your use case needs more options I recommend using directly awesome libraries from Brian Vaughn listed in dependencies section.

Demo

You can find a demo here.

Install

npm install --save react-simple-infinite-loading

Usage

import React from 'react'

import InfiniteLoading from 'react-simple-infinite-loading'

function Example({ items, fetchMore, hasMore }) {
  return (
    <div style={{ width: 300, height: 300 }}>
      <InfiniteLoading
        hasMoreItems={hasMore}
        itemHeight={40}
        loadMoreItems={fetchMore}
      >
        {items.map(item => <div key={item}>{item}</div>)}
      </InfiniteLoading>
    </div>
  )
}

Link to example

Dependencies

react-simple-infinite-loading has only three dependencies:

react-window is made to display efficiently large lists. It only creates components for the visible elements and reuse nodes.
react-window-infinite-loader is a HOC that loads elements just-in-time as user scrolls down the list
react-virtualized-auto-sizer helps you displaying your list so it fits the space available in its parent container.

Properties

property name	required	type	description
children	yes	function	The children function should return the jsx for an item of the list. An object is passed as parameter containing `item`, `index`, `style`. You must pass the style to top-level tag of your item's jsx.
items	yes	array	An array of elements. Any type of elements is accepted.
itemHeight	yes	number	The height of an item. All items should have the same height.
itemsCount	no	number	The count of items to be loaded, if known. Prevents the scrollbar from changing its size as the items are being loaded.
hasMoreItems	no	boolean	A boolean that determines if there are still items to load using `loadMoreItems` function.
loadMoreItems	no	function	A function that will be called each time the list need to load more items.
placeholder	no	node	Any render-able value like strings or React.Nodes to be displayed while `children` is loading
customScrollbar	no	boolean	A boolean that determines if react-custom-scrollbars is used instead of native one
elementClassName	no	string	A React className prop that will be applied to every child container
ref	no	ref or function	A ref or a callback ref to get component instance so you can call instance's methods (see Methods section)

Methods

scrollTo(scrollOffset: number): void

see FixedSizeList methods section.

scrollToItem(index: number, align: string = "auto"): void

see FixedSizeList methods section.

resetloadMoreItemsCache(): void

Clear previously loaded items from cache.

example

import React from 'react'

import InfiniteLoading from 'react-simple-infinite-loading'

function Example({ items, fetchMore, hasMore }) {
  const ref = React.useRef()
  const scrollToTop = () => {
    if (ref.current) {
      ref.current.scrollTo(0)
    }
  }
  const scrollTo50 = () => {
    if (ref.current) {
      ref.current.scrollToItem(50)
    }
  }
  const resetCache = () => {
    if (ref.current) {
      ref.current.resetloadMoreItemsCache()
    }
  }

  return (
    <>
      <button onClick={scrollToTop}>Scroll to top</button>
      <button onClick={scrollTo50}>Scroll to 50</button>
      <button onClick={resetCache}>Reset cache</button>
      <div style={{ width: 300, height: 300 }}>
        <InfiniteLoading
          hasMoreItems={hasMore}
          itemHeight={40}
          loadMoreItems={fetchMore}
          ref={ref}
        >
          {items.map(item => <div key={item}>{item}</div>)}
        </InfiniteLoading>
      </div>
    </>
  )
}