Detecting user leaving page with react-router

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react-router v4 introduces a new way to block navigation using Prompt. Just add this to the component that you would like to block:

import { Prompt } from 'react-router'

const MyComponent = () => (
  <>
    <Prompt
      when={shouldBlockNavigation}
      message="You have unsaved changes, are you sure you want to leave?"
    />
    {/* Component JSX */}
  </>
)

This will block any routing, but not page refresh or closing. To block that, you’ll need to add this (updating as needed with the appropriate React lifecycle):

componentDidUpdate = () => {
  if (shouldBlockNavigation) {
    window.onbeforeunload = () => true
  } else {
    window.onbeforeunload = undefined
  }
}

onbeforeunload has various support by browsers.

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