How to send Json data when the webpage is closed?

Question

I am sending data using json when user does certain evens with the help of following code.

  console.log("   Ajax post");
  $.ajax({
    url: 'https://www.abc123.com/xyz',
    type: 'POST',
    dataType: 'json',
    data: {
      "md"   : qm["nd"],
      "url"  : ngurl,
      "data"   : sendpts
    },
    success: function(a){
        console.log("success");
        console.log(a.message);
    },
    error: function(request, status, error) {
        console.log("error");
    }
  }); 

Is there any way to send json data when the webpage gets closed along with the notification that the webpage was closed?