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react-event-listener

v0.6.6

Published

A React component that allow to bind events on the global scope

Downloads

2,302,707

Readme

react-event-listener

A React component for binding events on the global scope.

npm version npm downloads Build Status

Dependencies DevDependencies

Installation

npm install react-event-listener

The problem solved

This module provides a declarative way to bind events to a global EventTarget. It's using the React lifecycle to bind and unbind at the right time.

Usage

import React, {Component} from 'react';
import EventListener, {withOptions} from 'react-event-listener';

class MyComponent extends Component {
  handleResize = () => {
    console.log('resize');
  };

  handleScroll = () => {
    console.log('scroll');
  };

  handleMouseMove = () => {
    console.log('mousemove');
  };

  render() {
    return (
      <div>
        <EventListener
          target="window"
          onResize={this.handleResize}
          onScroll={withOptions(this.handleScroll, {passive: true, capture: false})}
        />
        <EventListener target={document} onMouseMoveCapture={this.handleMouseMove} />
      </div>
    );
  }
}

Note on server-side rendering

When doing server side rendering, document and window aren't available. You can use a string as a target, or check that they exist before rendering the component.

Note on performance

You should avoid passing inline functions for listeners, because this creates a new Function instance on every render, defeating EventListener's shouldComponentUpdate, and triggering an update cycle where it removes its old listeners and adds its new listeners (so that it can stay up-to-date with the props you passed in).

Note on testing

In this issue from React, TestUtils.Simulate. methods won't bubble up to window or document. As a result, you must use document.dispatchEvent or simulate event using native DOM api.

See our test cases for more information.

License

MIT