April 10, 2019

How to Check Whether User Online/Offline in Javascript

By Krishnaa JavaScript Questions 0 Comments

This is a very small and basic tutorial about usage of navigator api to check if user is online or offline.

<!DOCTYPE html>

<head>

<title>Document</title>

</head>

<body>

</div>

</body>

</html>

const status = window.navigator.onLine;

if(status) online()

else offline()

window.addEventListener('online', online);

window.addEventListener('offline', offline);

function online(){

document.getElementById('container').style.backgroundColor = 'green';

document.querySelector('span').textContent = 'Online';

}

function offline(){

document.getElementById('container').style.backgroundColor = 'red';

document.querySelector('span').textContent = 'Offline';

}

#container {

width: 100%;

border: 1px solid black;

text-align: center;

color: #fff;

}