Question

function girisAjaxKontrol() {
var kullanici = { 'kullaniciAdi': $('#username').val(), 'sifre': $('#password').val() };

$.ajax({
    url: '/Giris/GirisGecerliMi',
    type: 'POST',
    data: kullanici,
    success: girisAjaxReturn,
    error: function (error) {
        alert(error.toString());            
    }
});

}

Everything works fine when debugging the asp .Net MVC4 project. But, after publish, the code block above returns an alert message as “[object Object]”. Why error message is not string, and why it doesn’t work after publish?

Answer 1

The .error() event of jQuery.ajax() accepts three arguments:

the jqXHR (in jQuery 1.4.x, XMLHttpRequest) object,
a string describing the type of error that occurred and
an optional exception object, if one occurred.
– More about jQuery.ajax() here.

Your .error() event is accepting one argument which automatically read by jQuery as the jQXHR object. To see it inside the alert, try to do something like this:

alert(JSON.stringify(error));

Or, you might want to return the description of the error:

error: function(error, textStatus) {
     alert(textStatus);
}

The exception object is only returned if an HTTP error occured.