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.