scottfirestone / redux-infinite-scroll

React infinite scroll component designed for a Redux data-flow.

Note: This project was forked from https://github.com/RealScout/redux-infinite-scroll, and updated for compatibility with React 16.0.0.

Redux Infinite Scroll

A stateless React infinite scroll component meant for usage within Redux.

Important

If you are using an element as the scrollable component, rather than the window, you MUST pass a fixed height to the containerHeight prop (many issues will be fixed by following this step).

Demo & Examples

http://realscout.github.io/redux-infinite-scroll/

Installation

npm install redux-infinite-scroll --save

Importing Via AMD/CommonJS

ES6 format

import ReduxInfiniteScroll from 'redux-infinite-scroll';

ES5 format

var ReduxInfiniteScroll = require('redux-infinite-scroll');

Importing Via Script Tag

If you decide to use either one of the distribution files found in /dist, then you can access the ReduxInfiniteScroll via a global variable.

ES6 format

ReduxInfiniteScroll

ES5 format

ReduxInfiniteScroll.default;

The difference is due to the ReduxInfiniteScroll being an ES6 module and therefore having a different export syntax than ES5.

Usage

In order to use it in your React app, simply import it and follow the example below. The component expects to receive child elements that it then injects into the DOM. The loadMore prop expects a function that requests for more items to be loaded once the container/window has reached the bottom threshold. If there are no more items left to be passed to the component, make sure to set the hasMore prop to be false. Important If you are using an element as the scrollable component, rather than the window, you MUST pass a fixed height to the containerHeight prop.

ES6 format

// MessageList.jsx

import InfiniteScroll from 'redux-infinite-scroll';
import ChatActions from './ChatActions';

class MessageList extends Component {
  _loadMore() {
    this.props.dispatch(ChatActions.fetchMessages())
  }

  _renderMessages() {
    return _.map(this.props.messages, (msg) => {
      return(
          <div>{msg}</div>
      )
    })
  }

  render() {
    return (
        <InfiniteScroll
          items={this._renderMessages()}
          loadMore={this._loadMore.bind(this)}
        />
    )
  }
}

Where your Redux action and reducer might look something like this:

// ChatActions.js

export function fetchMessages(params) {
  return {
    type: FETCH_MESSAGES,
    messages: ['hi there', 'hi again', 'still here']
  };
}


// ChatReducer.js


const initialState = {
  messages: []
}

function chatReducer(state=initialState, action=undefined) {
  switch (action.type) {
    case FETCH_MESSAGES:
      return Object.assign({}, initialState, {
        messages: initialState.concat(action.messages)
      })
  }
}

Options

Props	Type	Required	Default	Description
elementIsScrollable	bool	no	true	Defines whether the div will have a fixed height and listens to the div's overflow event or instead have a non-fixed height and listen to the window scroll event
containerHeight	integer or string	no	'100%'	Sets an inline style on the height of the topmost div.
threshold	integer	no	100	The number of pixels from the bottom that the scroll bar must reach in order to trigger loadMore.
horizontal	bool	no	false	Whether to check for horizontal scrolling
hasMore	bool	no	true	Whether there are more items waiting to be displayed. Set this to false once all of the items have been passed down to either items or children.
loadingMore	bool	no	false	A prop that should be set to true by the parent component whenever the loadMore function gets invoked, and then toggled to false once that function has finished updating the items prop.
loader	any	no	Loading...	The value of this prop gets injected as the last element of the parent div when hasMore loadingMore and showLoader are all true.
showLoader	bool	no	true	Whether to show the loader when the loadingMore property is true
loadMore	function	yes	undefined	The function is called when the component has reached the threshold and hasMore is true.
holderType	string	no	div	The type the loader is rendered as, could be ul, dl, etc.
className	string	no	''	Any additional classes to be added to the holder.
items	array	no	[]	The array of elements waiting to be rendered. Use either this or children. Deprecated.
children	array	no	[]	The array of elements waiting to be rendered. Use either this or items.

Credits

RealScout Heavily inspired by react-infinite-scroll.

License

MIT Licensed. Copyright (c) RealScout Inc.