gistfile1.js

var userName = view.$el.find('#txtUserName').val(),
    password = view.$el.find('#txtPassword').val();
    
$.when(user.login())
    .done(function() {
        $.when(user.fetch())
            .done(function() {
                if (user.get("isAdmin")) {
                    view.showAdminPanel();
                }                
                view.showAuthenticatedScreen();
            });
    }).fail(function(result) {
        if (result.responseCode === "InvalidCredentials") {
            view.showError("Invalid credentials!");
        } else {
            view.showError("Unable to login - unspecified error!");
        }
    });