Check Active Internet Connection [duplicate]

This question already has answers here: 开发者_StackOverflow Detect the Internet connection is offline? (22 answers) Closed 1 year ago.

Obviously this is a Javascript problem. As javascript are already loaded to the server, I was wondering if there is way to check whether there is active internet connection or not.

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You could send an ajax request and see if it gets a response.
With jQuery:

$.ajax({
  url: 'ajax/test.html',
  success: function(data) {
    alert('Connection.');
  },
  error: function(data) {
    alert('No Connection.');
  }
});