始终在控制器中为mvc4中的ajax帖子获取空值 [英] Always getting null values in controller for ajax post in mvc4

问题描述

嗨
i我正在尝试从我的视图到控制器的ajax帖子获取一些数据的列表。

但是当我尝试访问（在控制器中检查断点）时的属性对象（searchTerm）它总是显示空值。我试过没有字符串化和字符串化。

我的观点看起来像这样。

Hi i am trying an ajax post from my view to controller for getting the list of some data.
But when I tried to access (break point checked in controller) the properties of the object (searchTerm) it always showed null value. I tried without stringifying and stringifying.
My view is look like this.

@model IEnumerable<mvc41.models.student>

<link href="../../Content/jquery-ui-1.10.3.custom.min.css" rel="stylesheet" type="text/css" />
<script src="../../Scripts/jquery-1.9.1.js" type="text/javascript"></script>
<script src="../../Scripts/jquery-ui-1.10.3.custom.min.js" type="text/javascript"></script>
<script type="text/javascript">
    $(function () {
        $("#txtSearch").autocomplete({
            source: '@Url.Action("GetStudents")',
            minLength: 1
        });

        $("#btnSearch").click(function () {
            var searchTerm = $("#txtSearch").val();
             $.ajax({
                url: 'Home/ListStudent',
                type: 'POST',
                contentType: 'application/json',
                dataType: 'json',
                data: JSON.stringify(searchTerm),
                success: function (data) {
                    alert(data.success);
                },
                error: function () {
                    alert("error");
                }
            });
            alert(searchTerm);
        });
    });
</script>
@if (TempData["alertMessage"]!= null) {
  <script type="text/javascript">
          alert("@TempData["alertMessage"]");
      </script>
}

<div style="font-family:Arial">
@using (@Html.BeginForm())
{
    Name: 
    @Html.TextBox("searchTerm", null, new { id = "txtSearch" })
    <input type="submit" value="Search"  id = "btnSearch"/>
}

在Controller中我有json方法。

and in Controller i have json method.

[HttpPost]
       public JsonResult ListStudent(string searchTerm)
       {
           StudentDataContext db = new StudentDataContext();
           List<student> students;
           if (string.IsNullOrEmpty(searchTerm))
           {
               students = db.Students.ToList();
           }
           else
           {
               students = db.Students
                   .Where(s => s.Name.StartsWith(searchTerm)).ToList();
           }
           return Json(students,JsonRequestBehavior.AllowGet);
       }

如果有人知道我在哪里做错了请让我知道。

提前谢谢。

if anyone know where i am doing wrong please let me know.
Thanks in advance.

推荐答案

（ function （） {

（ #txtSearch）。autocomplete（{
来源：' @ Url.Action（GetStudents）'，
minLength： 1
}）;

("#txtSearch").autocomplete({ source: '@Url.Action("GetStudents")', minLength: 1 });

（ ＃btnSearch）。click（ function （）{
var searchTerm =

("#btnSearch").click(function () { var searchTerm =

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