react-scrollable-feed

react-scrollable-feed

Perfect for any chat UI or any kind of feed.

Demo

View a live demo here.

Install

npm install --save react-scrollable-feed

Usage

import * as React from 'react'

import ScrollableFeed from 'react-scrollable-feed'

class App extends React.Component {
  render() {
    const items = ['Item 1', 'Item 2'];

    return (
      <ScrollableFeed>
        {items.map((item, i) => <div key={i}>{item}</div>)}
      </ScrollableFeed>
    );
  }
}

Options

forceScroll

• Type: boolean
• Default: false

If set to true, will scroll to the bottom after each update on the component. By default, if the scrollable section is not at the bottom before the update occurs, it will leave the scroll at the same position.

animateScroll

• Type: (element: HTMLElement, offset: number) => void
• Default: element.scrollBy({ top: offset });

Allows to override the scroll animation by any implementation.

onScrollComplete

• Type: () => void
• Default: () => {}

Is called after the scroll animation has been executed.

changeDetectionFilter

• Type: (previousProps: ScrollableFeedComponentProps, newProps: ScrollableFeedComponentProps) => boolean
• Default: () => true

Allows to customize when the scroll should occur. This will be called everytime a componentDidUpdate happens, which means everytime one of the props changes. You will receive as parameters the previous and the new props.

Note: ScrollableFeedComponentProps is defined as Readonly<{ children?: ReactNode }> & Readonly<ScrollableFeedProps>

If you want to compare the last children from both the previous and new props, you could do something like this :

import * as React from 'react'

import ScrollableFeed from 'react-scrollable-feed'

class App extends React.Component {
  changeDetectionFilter(previousProps, newProps) {
    const prevChildren = previousProps.children;
    const newChildren = newProps.children;

    return prevChildren !== newChildren
      && prevChildren[prevChildren.length - 1] !== newChildren[newChildren.length - 1];
  }

  render() {
    const items = ['Item 1', 'Item 2'];

    return (
      <ScrollableFeed
        changeDetectionFilter={this.changeDetectionFilter}
      >
        {items.map((item, i) => <div key={i}>{item}</div>)}
      </ScrollableFeed>
    );
  }
}

export default App;

viewableDetectionEpsilon

• Type: number
• Default: 2

Indicates the number of pixels of difference between the actual bottom and the current position that can be tolerated. The default setting should be fine for most use cases.

For more details

For more details on how to integrate react-scrollable-feed in your application, have a look at the example folder.

License

MIT © Gabriel Bourgault