值未在Ajax Call上设置为KO可观察变量

Question

1. 当对控制器方法进行ajax调用时，我得到的是空值。 我是淘汰赛的新手，感谢您在问题上的帮助。 我将此js代码放在外部文件中，并在按钮单击时调用loginmethod函数。 根据要求没有表单标签。

2. 如何包含以下摘录的敲除清晰的验证？

var ViewModel = function () {

    //Make the self as 'this' reference
    var self = this;

    //Declare observable which will be bind with UI
    self.UserName = ko.observable("");
    self.Password = ko.observable("");
    self.RememberMe = ko.observable(false);
    self.ReturnUrl = ko.observable("");

    //The Object which stored data entered in the observables
    var CustData = {
        UserName: self.UserName,
        Password: self.Password,
        RememberMe: self.RememberMe,
        ReturnUrl : self.ReturnUrl,
    };

    //Declare an ObservableArray for Storing the JSON Response
    self.LoginMethod = function () {

        //Ajax call to Insert the Customer record
        $.ajax({
            type: "POST",
            url: "http://localhost:8089/Home/SignIn/",
            data: ko.toJSON(CustData), //Convert the Observable Data into JSON
            success: function (data) {
                console.log("success");
            },
            error: function (data) {
                console.log("failed");
                console.log("data");
            }
        });

        //Ends Here
    };
};

ko.applyBindings(new ViewModel());