react-interval

Safe React wrapper for setInterval

Installation

NPM

npm install --save react react-interval

Don't forget to manually install peer dependencies (react) if you use npm@3.

1998 Script Tag:

<script src="https://unpkg.com/react/dist/react.min.js"></script>
<script src="https://unpkg.com/react-interval/build/react-interval.min.js"></script>
(Module exposed as `ReactInterval`)

Demo

http://nkbt.github.io/react-interval

Codepen demo

http://codepen.io/nkbt/pen/ZGmpoO

Usage

Quickstart

Start counting on render

import ReactInterval from 'react-interval';

const App = React.createClass({
  getInitialState() {
    return {count: 0};
  },

  render() {
    const {count} = this.state;

    return (
      <div>
        {count}
        <ReactInterval timeout={1000} enabled={true}
          callback={() => this.setState({count: this.state.count + 1})} />
      </div>
    );
  }
});

Full example

Change timeout on the fly, start and stop counting

import React from 'react';
import ReactDOM from 'react-dom';
import ReactInterval from 'react-interval';

const App = React.createClass({
  getInitialState() {
    return {
      enabled: false,
      timeout: 1000,
      count: 0
    };
  },

  render() {
    const {timeout, enabled, count} = this.state;

    return (
      <div>
        <ReactInterval {...{timeout, enabled}}
          callback={() => this.setState({count: this.state.count + 1})} />

        <input type="number" step="200" min="200" max="5000" value={this.state.timeout}
          onChange={({target: {value}}) => this.setState({timeout: parseInt(value, 10)})} />&nbsp;

        <button disabled={enabled} onClick={() => this.setState({enabled: true})}>
          Start</button>&nbsp;

        <button disabled={!enabled} onClick={() => this.setState({enabled: false})}>
          Stop</button>&nbsp;

        {count}
      </div>
    );
  }
});

const appRoot = document.createElement('div');
document.body.appendChild(appRoot);
ReactDOM.render(<App />, appRoot);

Options

callback: PropTypes.func.isRequired

Function repeatedly called after timeout

enabled: PropTypes.bool (default: false)

Should start timer?

timeout: PropTypes.number (default: 1000)

Timeout before each callback call

License

MIT