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

// start snippet
error: function(XMLHttpRequest, textStatus, errorThrown) {
        if (XMLHttpRequest.readyState == 4) {
            // HTTP error (can be checked by XMLHttpRequest.status and XMLHttpRequest.statusText)
        }
        else if (XMLHttpRequest.readyState == 0) {
            // Network error (i.e. connection refused, access denied due to CORS, etc.)
        }
        else {
            // something weird is happening
        }
    }
//end snippet