我得到的消息未捕获的类型错误：undefined是不是一个函数当我尝试在我家的控制器调用一个方法

建议也许是为什么我得到这个消息？

  findIdpActivities =功能（PERNR，回调）{
    restEndPoint = ServiceBase的+'主页/ FindIdpActivities;
    数据={'PERNR'：'+ PERNR +'};
    makeJsonDataAjaxCall（回调）;
};

makeJsonDataAjaxCall =函数（回调，OBJ）{
    $阿贾克斯（{
        键入：POST，
        网址：restEndPoint，
        的contentType：应用/ JSON的;字符集= UTF-8，
        数据类型：JSON，
        数据：数据，
        成功：功能（数据）{
            回调（数据）;
        }
    }）;
};
 

在按钮单击执行方法。

  $（文件）。在（点击，输入[名称= btnViewActivities]功能（E）{
    即preventDefault（）;
    。VAR值= $（本）.parent（）找到（输入[名称= hiddenPerNr]）VAL（）。
    dataService.findIdpActivities（值）;
}）;
 

和这是在HomeController的方法

  [HttpPost]
    公共JsonResult FindIdpActivities（字符串PERNR）
    {
        viewModel.GetIdpActivities（PERNR）;

        返回JSON（新
            {
                活动= viewModel.IdpActivities
            }）;
    }
 

解决方案

这就是当你试图调用一个函数被定义在此之前发生的共同JavaScript错误。

例如，虽然这code按预期工作：

  VAR的sayHello =功能（）{
    返回你好！
};

警报（sayHello的（））;
 

如果您反转语句的顺序中的未捕获的类型错误：未定义不是一个函数的会发生错误：

 警报（的sayHello（））;

VAR的sayHello =功能（）{
    返回你好！
};
 

因此​​，我建议你仔细检查正在正确加载脚本，并在 findIdpActivities 被正确初始化为的DataService 对象的功能。

I get the message Uncaught TypeError:Undefined is not a function when I try to call a the method in my home controller.

Advice perhaps as to why I am getting this message?

findIdpActivities = function (pernr, callback) {
    restEndPoint = serviceBase + 'Home/FindIdpActivities';
    data = "{'perNr':'" + pernr + "'}";
    makeJsonDataAjaxCall(callback);
};

makeJsonDataAjaxCall = function (callback, obj) {
    $.ajax({
        type: "POST",
        url: restEndPoint,
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        data: data,
        success: function (data) {
            callback(data);
        }
    });
};

executing the method upon button click.

$(document).on("click", "input[name=btnViewActivities]", function (e) {
    e.preventDefault();
    var value = $(this).parent().find("input[name=hiddenPerNr]").val();
    dataService.findIdpActivities(value);
});

and this is the method in the HomeController

[HttpPost]
    public JsonResult FindIdpActivities(string perNr)
    {
        viewModel.GetIdpActivities(perNr);

        return Json(new
            {
                Activities = viewModel.IdpActivities
            });
    }

That's a common javascript error that happens when you try to call a function before it is defined.

For instance, while this code works as expected:

var sayHello= function () {
    return 'Hello!'
};

alert(sayHello());

If you reverse the order of the statements the "Uncaught TypeError: undefined is not a function" error will occur:

alert(sayHello());

var sayHello= function () {
    return 'Hello!'
};

Hence, I suggest you double check that your scripts are being loaded correctly, and that the findIdpActivities is being properly initialized as a function of the dataService object.