React Timeout

Warning: setState(...): Can only update a mounted or mounting component. This usually means you called setState() on an unmounted component. This is a no-op.

Warning: Can only update a mounted or mounting component. This usually means you called setState, replaceState, or forceUpdate on an unmounted component. This is a no-op.

Seeing a lot of the above? If so this might be useful!

React Timeout is a higher order component for React and React Native providing the wrapped component with safe versions of

Set	Clear
setTimeout	clearTimeout
setInterval	clearInterval
setImmediate	clearImmediate
requestAnimationFrame	cancelAnimationFrame

When the wrapped component is unmounted, any lingering timers will be canceled automatically.

Installation

npm install --save react-timeout

React / React Native

import ReactTimeout from 'react-timeout'

Examples

ES6 Classes - "The Light Switch"

The component simulates a light switch. It has a state on which is true or false. When the button is clicked it waits 5000ms before switching the on state.

import React from 'react'
import ReactTimeout from 'react-timeout'

class LightSwitchExample extends React.Component {
  state = {
    on: false
  }
  toggle = () => {
    this.setState({ on: !this.state.on })
  }
  handleClick = (e) => {
    this.props.setTimeout(this.toggle, 5000) // call the `toggle` function after 5000ms
  }
  render () {
    return (
      <div style={{ backgroundColor: (this.state.on ? 'yellow' : 'gray') }}>
        <button onClick={this.handleClick}>Click me!</button>
      </div>
    )
  }
}
export default ReactTimeout(LightSwitchExample)

If the component is unmounted before the 5000ms is up, the timeout is canceled by ReactTimeout.

Had we just called the regular old setTimeout, the callback toggle would still fire and try setting the state of an unmounted component.

Functional Stateless Components

const Example = (props) => {
  return (
    <button
      onClick={() => props.setTimeout(..)}>Click me!</button>
  )
}
export default ReactTimeout(Example)

With ES7 Annotations

@ReactTimeout
class Example extends React.Component {
  render () {
    return (
      <button
        onClick={() => this.props.setTimeout(..)}>Click me!</button>
    )
  }
}

To access the wrapped instance

If you need access to the component wrapped by ReactTimeout, use component.getWrappedInstance().

Something similar

react-timer-mixin

The timer mixin recommended by the react-native docs.

Caveats

React Native 0.17 and below

If you're using a version of React Native that is 0.17 or below you have to import from the /native namespace.

import ReactTimeout from 'react-timeout/native' // only for react-native 0.17 or below