Even if you have your application fully cached, you couldn’t perform any external request without internet connection. That’s why in order to build an offline-capable application, you must know when it’s actually offline.

This lesson shows you how to use the NavigatorOnLine API and online/offline events in order to disable the functionality to send messages of the application.

    this.online = navigator.onLine

    window.addEventListener('online', () => (this.online = true))

    window.addEventListener('offline', () => {

      this.online = false

    })

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