[jQuery] redirect response via ajax call

[jQuery] redirect response via ajax call


I currently wrote a quick workaround for what i want done, but i would
like to see how other people would go about doing this. It is simply
an ajax login form, but there is a caveat. There can be two http
responses from the server: 200 OK and 302 Redirect. The 200 codes are
just notifications that either the login was invalid or the user
account has been deactivated, so i simply apply a javascript alert. My
problem is the redirect.. ideally i would like the $.ajax object to
recognize the status is 302 and then redirect to the appropriate
location:
This is what i have currently, as one can see i simply see if the
returned "data" string begins with a "/" and then redirects otherwise
do an alert(). Does anyone have a more elegant way of doing this?
Also, not it is probably relevant, but i am using the django
HttpResponse and HttpResponseRedirect objects.
$().ready(function() {
    $("#login_form").submit(function(event) {
        event.preventDefault()
        var data = {}
        data.username = $("input[name='username']", this).val()
        data.password = $("input[name='password']", this).val()
        $.ajax({
            type: "POST",
            url: "/user/login/",
            data: data,
            success: function(data, status) {
                s = data.substr(0,1)
                if (s == '/') {
                    document.location = data
                } else {
                    alert(data)
                }
            },
            error: function(xhr, status, error) {
                alert(error)
            }
        })
    })
})