JQuery Ajax - How to Detect Network Connection error when making Ajax call

Question

I have some Javascript JQuery code that does an Ajax call to the server every 5 mins, it\'s to keep the server session alive and keep the user logged in. I\'m using $.

Answer 1

What I see in this case is that if I pull the client machine's network cable and make the call, the ajax success handler is called (why, I don't know), and the data parameter is an empty string. So if you factor out the real error handling, you can do something like this:

function handleError(jqXHR, textStatus, errorThrown) {
    ...
}

jQuery.ajax({
    ...
    success: function(data, textStatus, jqXHR) {
        if (data == "") handleError(jqXHR, "clientNetworkError", "");
    },
    error: handleError
});