How to check internet connection using javascript

Here is the simple javascript function for getting internet status working or not..

<script>
function checkInternetCon() {
var status = navigator.onLine;
if (status) {
alert("Yes!! Working");
} else {
alert("Sad!! Not Working ");
}
}</script>

Call above function on button onclick event.

<button onclick="checkInternetCon()">Check Internet Connection</button>

You can also use setInterval method in javascript

setInterval(function(){ 
var status = navigator.onLine;
 if (status) {
 console.log('Working..');
 } else {
  console.log('Not Working..');
 }
}, 5000);