How Can JavaScript Detect and Handle Internet Disconnections?

How to Detect Internet Disconnection in JavaScript

Knowing the online status of your users is crucial for providing a reliable and responsive user experience. JavaScript offers several methods to detect when the internet connection is lost.

The most widely supported method is using the window.navigator.onLine property. This property returns a Boolean value indicating the current online status. When the connection is established, it returns true; otherwise, it returns false.

To monitor changes in the online status, you can listen to the online and offline events triggered by the window object. These events provide a callback function that executes when the connection is restored or lost, respectively.

Example Code:

console.log('Initially ' + (window.navigator.onLine ? 'on' : 'off') + 'line');

window.addEventListener('online', () => console.log('Became online'));
window.addEventListener('offline', () => console.log('Became offline'));

document.getElementById('statusCheck').addEventListener('click', () => console.log('window.navigator.onLine is ' + window.navigator.onLine));

Once you have detected that the internet connection is offline, you can implement appropriate measures to handle the situation, such as displaying an error message or providing alternative content. By leveraging these JavaScript techniques, you can effectively monitor and respond to changes in the user's internet connection.

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