MVC4 JsTree 将选定的节点传递给控制器

我的视图中有以下javascript来构建TreeView并从服务器获取数据：

  $(function () {
    $("#EquipmentTree").jstree({
        "json_data": {
            "ajax": {
                "url": "/Helper/GetEquipTreeViewData",
                "type": "POST",
                "data": function () {$("#EquipmentTree").jstree('get_selected').attr('id');},
                "dataType": "json",
                "contentType": "application/json charset=utf-8"
            }
        },
        "themes": {
            "theme": "default",
            "dots": true,
            "icons": true,
            "url": "Scripts/jstree-v.pre1.0/themes/default/style.css"
        },
        "plugins": ["themes", "json_data"],
        "core": { "animation": 100 }
    });
});

我的控制器具有：

public ActionResult GetEquipTreeViewData(string nodeId)
    {
        do some stuff
        return Json (data);
    }

除了我从未获得选定的节点之外，一切都工作正常。我总是在nodeId得到NULL。即使我更改为：

"data": { nodeId : "TEST" }

我仍然得到空或一些Javascript错误。这让我发疯了。我也试过：

"data" : JSON.stringfy(nodeId);

并继续发送空值。

它应该是一个正常的 AJAX 调用，但事实并非如此。我只需要将选定的树节点传递给控制器，即可根据用户选择重新加载结果页面。

感谢您的帮助。

[编辑]我对测试变体的结果：

测试1：

var selected_node = $("#EquipmentTree").jstree('get_selected').attr('id');
    $("#EquipmentTree").jstree({
        "json_data": {
            "ajax": {
                "url": "/Helper/GetEquipTreeViewData",
                "type": "POST",
                "data": { nodeId : selected_node },
                "dataType": "json",
                "contentType": "application/json; charset=utf-8"
            }
        },
        "themes": {
            "theme": "default",
            "dots": true,
            "icons": true,
            "url": "Scripts/jstree-v.pre1.0/themes/default/style.css"
        },
        "plugins": ["themes", "json_data"],
        "core": { "animation": 100 }
    });
});

浏览器错误：无效的 Jason Primitive： nodeId

[测试2]

法典：

 $(function () {
        var selected_node = $("#EquipmentTree").jstree('get_selected').attr('id');
        $("#EquipmentTree").jstree({
            "json_data": {
                "ajax": {
                    "url": "/Helper/GetEquipTreeViewData",
                    "type": "POST",
//                    "data": { nodeId : selected_node },
                    "data": JSON.stringify ("nodeId : " + selected_node),
                    "dataType": "json",
                    "contentType": "application/json; charset=utf-8"
                }
            },
            "themes": {
                "theme": "default",
                "dots": true,
                "icons": true,
                "url": "Scripts/jstree-v.pre1.0/themes/default/style.css"
            },
            "plugins": ["themes", "json_data"],
            "core": { "animation": 100 }
        });
    });

在控制器上调用了该函数，但收到 null。浏览器数据：

Request URL:http://localhost:7767/Helper/GetEquipTreeViewData
Request Method:POST
Status Code:200 OK
Request Headersview parsed
POST /Helper/GetEquipTreeViewData HTTP/1.1
Host: localhost:7767
Connection: keep-alive
Content-Length: 24
Accept: application/json, text/javascript, */*; q=0.01
Origin: http://localhost:7767
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.76 Safari/537.36
Content-Type: application/json; charset=UTF-8
Referer: http://localhost:7767/MasterDataAdminEquipment
Accept-Encoding: gzip,deflate,sdch
Accept-Language: pt-BR,pt;q=0.8,en-US;q=0.6,en;q=0.4
Cookie: ASP.NET_SessionId=yuf1omlottf0xb4aklvfr4wg
Request Payload view source
nodeId : EquipmentTree
No Properties

修复它具有"无属性"的请求有效负载。通常我们会有一个表单数据，其中包含"参数"和"值"对的字典。这是我正在尝试的第n种组合。很奇怪...