react-in-viewport

React In Viewport Component

Wrapper component to detect if the component is in viewport. Use Intersection Observer API

Dependencies: Intersection Observer Polyfills

Usages

Wrap your component with handleViewport HOC, you will receive inViewport props indicating the component is in viewport or not.

handleViewport HOC accepts three params

1. Component
2. Options: second param is the option you want to pass to Intersection Observer API.
3. Config object:

• disconnectOnLeave { Boolean } disconnect intersection observer after leave

The HOC preserve onEnterViewport and onLeaveViewport props as a callback

NOTE: Stateless: Need to add ref={this.props.innerRef} on your component

import handleViewport from 'react-in-viewport';

const Block = (props: { inViewport: boolean }) => {
  const { inViewport, innerRef } = props;
  const color = inViewport ? '#217ac0' : '#ff9800';
  const text = inViewport ? 'In viewport' : 'Not in viewport';
  return (
    <div className="viewport-block" ref={innerRef}>
      <h3>{ text }</h3>
      <div style={{ width: '400px', height: '300px', background: color }} />
    </div>
  );
};

const ViewportBlock = handleViewport(Block, /** options: {}, config: {} **/);

const Component = (props) => (
  <div>
    <div style={{ height: '100vh' }}>
      <h2>Scroll down to make component in viewport</h2>
    </div>
    <ViewportBlock onEnterViewport={() => console.log('enter')} onLeaveViewport={() => console.log('leave')} />
  </div>
))