jquery - Ajax.BeginForm 返回未定义的 JSON(开发工具显示正在返回 JSON)

Question

在尝试从 Controller 返回简单的 JSON 对象时，我遇到了一个奇怪的问题。在 Firefox 调试工具中，我可以很好地看到返回的 JSON；但是，在我的 javascript 回调中，我的 console.log(data)

中出现 undefined

帖子(查看)

 @{
    string postAction = string.IsNullOrEmpty(Model._id) ? "AddCredential" : "EditCredential";
    string title = string.IsNullOrEmpty(Model._id) ? "Add" : "Edit";
    string onSuccessAction = "";

    if (!string.IsNullOrEmpty(Model.CallerLccation))
    {
        onSuccessAction = "Credentials.finishAddingCredFromEditPage();";
    }
    else
    {
        onSuccessAction = "General.init();$.fancybox.close();";
    }
}
<h3>@title Credential</h3>


@using (Ajax.BeginForm(postAction, new AjaxOptions { HttpMethod = "Post", OnSuccess = onSuccessAction, UpdateTargetId = "credentialList", InsertionMode = InsertionMode.Replace }))
{  

Controller (这里没有错误)

 public ActionResult AddCredential(CredentialViewModel viewModel)
    {

 //.......................      
                if (!string.IsNullOrEmpty(viewModel.CallerLccation))
            {
                //location the new credential being edited from is different than the normal location _CredentialList.cshtml

                return Json(new
                {
                    callerLocation = viewModel.CallerLccation,
                    credentialsDict = (object)JsonConvert.SerializeObject(GetCredentials(), Formatting.None),
                    newName = viewModel.Name,
                    newKey = newDoc["id"]

                });
            }




        return PartialView("_CredentialList", GetCredentialListViewModel());
    }  

回调

finishAddingCredFromEditPage: function (data) {
    //diff logic for diff places add credential is called from

    //UNDEFINED HERE
    console.log(data);
    switch(data.callerLocation) {
        case "edit":
            //reload phone dict
            allCredentials = data.credentialsDict;

            //add option to all dropdowns on the edit page
            $('.credentialDropdown').each(function(i) {
                $(this).prepend("<option selected></option>")
                    .attr("value", data.newKey)
                    .text(data.newName);
            });



            //reset stuff
            General.init();
            $.fancybox.close();
            break;
    }
},  

我尝试过的

1. 将 JsonRequestBehavior.AllowGet 添加到我的 return Json() 语句
2. 添加一个带有 id = credentialList 的虚拟 div，看看它是否会填充 JSON
3. 删除了 UpdateTargetId 和 InsertionMode 属性

我认为，也许在幕后，MVC 正在发送期望 HTML 的请求，因为存在 updateTargetId，但这并不是问题所在。我检查了服务器的响应，JSON 确实存在。我不太确定还需要采取哪些其他步骤来解决此问题。

Answer 1

我明白了。显然，您不能在带有参数的回调上使用括号。不要引用我的观点，因为我没有找到任何相关文档，但根据我的观察，情况确实如此。我的看法改变了

onSuccessAction = "Credentials.finishAddingCredFromEditPage();";  

到

onSuccessAction = "Credentials.finishAddingCredFromEditPage";  

终于能够在回调中得到一些东西