Best way to check if AJAX request was successful in jQuery

Question

I\'ve been checking to make sure my AJAX requests are successful by doing something like this:

$.post(\"page.php\", {data: stuff}, function(data, status) {
          


        

Answer 1

jQuery considers "successful" in the way it is in the source code, of course. This does not include a status code of 404/500 and neither a timeout, since no status code has been returned in that case.

You can check when exactly it returns "success":

// If successful, handle type chaining
if ( status >= 200 && status < 300 || status === 304 ) {

...
    // If not modified
    if ( status === 304 ) {

        statusText = "notmodified";
...

    // If we have data
    } else {

        try {
...
            statusText = "success"; // So: only when status code is in
                                    // the range 200 <= x < 300
...
        } catch(e) {
...
            statusText = "parsererror";
...
        }
    }