字符串未传递到控制器

Question

我试图通过 $.ajax 调用发布名为“selected”的字符串，但控制器（selected=null）收到空值？根据fiddler，selected 有一个值（{'selected':0100}）？

[HttpPost]
public ActionResult Index(string selected)
{
    return Json(new {value = "this is a test"});
}

$(document).ready(
     $("#btnSave").click(
         function () {
         var checkboxesselected = "0100";

         $.ajax({ type: 'POST',
             url: "/Home/Index",
             datatype: 'json',
             data: "{'selected':" + checkboxesselected + "}"
         });
     }
)

Answer 1

问题是您将数据作为字符串文字而不是对象发送到 jQuery。包含数据参数的行应为 data: {selected: checkboxesselected }

Answer 2

您缺少“checkboxesselected”周围的引号

$(document).ready(
    $("#btnSave").click(
        function () {
        var checkboxesselected = "0100";

        $.ajax({ type: 'POST',
            url: "/Home/Index",
            datatype: 'json',
            data: "{ 'selected' : '" + checkboxesselected + "'}"
        });
    }
)

Answer 3

尝试：

var val = { selected: checkboxesselected };

然后：
……

datatype: 'json',
data: val

​