使用Javascript/Json自动完成只返回错误框

我正在使用一个用户控件，我认为这可能会导致问题，因为我下面的示例引用的是一个实际的aspx默认页面，但是有人可能会在这里帮助我。我试图设置一个自动完成的文本框，我似乎得到的所有错误弹出窗口。不知道我的问题在哪里。我已经粘贴了整个代码，页面加载过程除外

HTML 代码隐藏

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是数据：{'CountryName'：'+$txtAutoComplete.val+'}，应该是数据类型：{'term'：'+$txtAutoComplete.val+'}，@CmdrTallen好的，更改了，但仍然收到一个错误框。更改错误：functionresult{…}为错误：functionjqXHR，textStatus，errorhorn{console.logtextStatus，errorhorn；}分享details@asdf_enel_hak这段代码根本不会发生任何事情。url:Search/Page%20Search%20Textbox.aspx/GetCategory在搜索前尝试追加斜杠或尝试url查看返回的内容

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Search Textbox.ascx.cs" Inherits="StagingApplication.Search.Search_Textbox" %>
<link href="../css/customPages.css" rel="stylesheet" />
<link href="//ajax.googleapis.com/ajax/libs/jqueryui/1.11.1/themes/smoothness/jquery-ui.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jqueryui/1.11.1/jquery-ui.min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
    $("#txtAutoComplete").autocomplete({
        source: function (request, response) {
            $.ajax({
                type: "POST",
                contentType: "application/json; charset=utf-8",
                url: "Search/Page%20Search%20Textbox.aspx/GetCategory",
                data: "{'CountryName':'" + $("#txtAutoComplete").val() + "'}",
                dataType: "json",
                success: function (data) {
                    response(data.d);
                },
                error: function (result) {
                    alert("Error");
                }
            });
        }
    });
});
</script>
<div>
    <asp:TextBox ID="searchText" runat="server" class="textboxLargeInline" AutoCompleteType="Search"></asp:TextBox>
    <asp:Button ID="searchButton" runat="server" class="standardButton" OnClick="searchButton_Click"/>
    <div>
        <input type="text" id="txtAutoComplete" />
    </div>
</div>

[WebMethod]
public static string[] GetCategory(string term)
{
    List<string> retCategory = new List<string>();
    string ConnectionString = Connect.Connect("Location");
    using (SqlConnection con = new SqlConnection(ConnectionString))
    {
        string query = string.Format("SELECT TOP 1000 [CountryName] FROM [Location].[dbo].[Country] WHERE [CountryName] LIKE '%{0}%'", term);
        using (SqlCommand cmd = new SqlCommand(query, con))
        {
            con.Open();
            SqlDataReader reader = cmd.ExecuteReader();

            while (reader.Read())
            {
                retCategory.Add(reader.GetString(0));
            }
        }
        con.Close();
    }
    return retCategory.ToArray();
}