ajax调用aspx.cs中的WebMethod

前台：

    <script language="javascript" src="../js/jquery-1.8.2.js"></script>
    <script language="javascript" src="../js/locationFilter.js"></script>

                    <tr>
                        <td class="fieldtitle" width="20%">
                            Test Filter:
                        </td>
                        <td class="fieldtitle" colspan="3">
                            <asp:DropDownList ID="ddlRegion" runat="server" CssClass="fieldList" onchange="initData('subregion')">
                            </asp:DropDownList>
                            <asp:DropDownList ID="ddlSubRegion" runat="server" CssClass="fieldList" onchange="initData('grid')">
                            </asp:DropDownList>
                            <asp:DropDownList ID="ddlGrid" runat="server" CssClass="fieldList" onchange="initData('pref')">
                            </asp:DropDownList>
                            <asp:DropDownList ID="ddlPref" runat="server" CssClass="fieldList" onchange="initData('city')">
                            </asp:DropDownList>
                            <asp:DropDownList ID="ddlCity" runat="server" CssClass="fieldList" onchange="initData('county')">
                            </asp:DropDownList>
                            <asp:DropDownList ID="ddlCounty" runat="server" CssClass="fieldList" onchange="initData('town')">
                            </asp:DropDownList>
                            <asp:DropDownList ID="ddlTown" runat="server" CssClass="fieldList" onchange="initData('village')">
                            </asp:DropDownList>
                            <asp:DropDownList ID="ddlVillage" runat="server" CssClass="fieldList">
                            </asp:DropDownList>
                        </td>
                        <td>
                            <asp:TextBox ID="txtWWID" runat="server" Style="display: none"></asp:TextBox>
                        </td>
                    </tr>

Js文件： locationFilter.js

$(document).ready(function () {
    alert(1);
    var Rgn_cd = "";
    var Subrgn_cd = "";
    var Grid_cd = "";
    var Pref_cd = "";
    var City_id = "";
    var County_id = "";
    var Town_id = "";
    var Village_id = "";
    var Type = "region";
    var WWID = $("#txtWWID").val();

    $.ajax({
        type: "POST",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        //url: "MallListCAM.aspx/initData",
        url: "../Mall/MallListCAM.aspx/initData",
        data: "{rgn_cd:'" + Rgn_cd + "', subrgn_cd:'" + Subrgn_cd + "',grid_cd:'" + Grid_cd + "',pref_cd:'" + Pref_cd + "',city_id:'" + City_id + "',county_id:'" + County_id + "',town_id:'" + Town_id + "',village_id:'" + Village_id + "',type:'" + Type + "',WWID:'" + WWID + "'}",
        success: function (data) {
            var result = JSON.parse(data.d);
            $("#ddlRegion").append($("<option value='ALL'>ALL</option>"));
            $("#ddlSubRegion").append($("<option value='ALL'>ALL</option>"));
            $("#ddlGrid").append($("<option value='ALL'>ALL</option>"));
            $("#ddlPref").append($("<option value='ALL'>ALL</option>"));
            $("#ddlCity").append($("<option value='ALL'>ALL</option>"));
            $("#ddlCounty").append($("<option value='ALL'>ALL</option>"));
            $("#ddlTown").append($("<option value='ALL'>ALL</option>"));
            $("#ddlVillage").append($("<option value='ALL'>ALL</option>"));
            //clearData("region");
            $.each(result, function (i, item) {
                $("#ddlRegion").append($("<option value='" + item.rgn_cd + "'>" + item.rgn_nm + "</option>"));
            })
        },
        error: function (err) {
            alert("err:" + err);
        }
    });
})

function initData(type) {
    if (type == "subregion") {
        clearData("subregion");
    }
    else if (type == "grid") {
        clearData("grid");
    }
    else if (type == "pref") {
        clearData("pref");
    }
    else if (type == "city") {
        clearData("city");
    }
    else if (type == "county") {
        clearData("county");
    }
    else if (type == "town") {
        clearData("town");
    }  

    var Rgn_cd = $("#ddlRegion").val();
    var Subrgn_cd = $("#ddlSubRegion").val();
    var Grid_cd = $("#ddlGrid").val();
    var Pref_cd = $("#ddlPref").val();
    var City_id = $("#ddlCity").val();
    var County_id = $("#ddlCounty").val();
    var Town_id = $("#ddlTown").val();
    var Village_id = $("#ddlVillage").val();
    var Type = type;
    var WWID = $("#txtWWID").val();

    $.ajax({
        type: "POST",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        url: "../Mall/MallListCAM.aspx/initData",
        data: "{rgn_cd:'" + Rgn_cd + "', subrgn_cd:'" + Subrgn_cd + "',grid_cd:'" + Grid_cd + "',pref_cd:'" + Pref_cd + "',city_id:'" + City_id + "',county_id:'" + County_id + "',town_id:'" + Town_id + "',village_id:'" + Village_id + "',type:'" + Type + "',WWID:'" + WWID + "'}",
        success: function (data) {
            var result = JSON.parse(data.d);

            if (type == "subregion") {
                $.each(result, function (i, item) {
                    $("#ddlSubRegion").append($("<option value='" + item.subrgn_cd + "'>" + item.subrgn_nm + "</option>"));
                })
            }
            else if (type == "grid") {
                $.each(result, function (i, item) {
                    $("#ddlGrid").append($("<option value='" + item.grid_cd + "'>" + item.grid_nm + "</option>"));
                })
            }
            else if (type == "pref") {
                $.each(result, function (i, item) {
                    $("#ddlPref").append($("<option value='" + item.pref_cd + "'>" + item.pref_nm + "</option>"));
                })
            }
            else if (type == "city") {
                $.each(result, function (i, item) {
                    $("#ddlCity").append($("<option value='" + item.city_id + "'>" + item.name + "</option>"));
                })
            }
            else if (type == "county") {
                $.each(result, function (i, item) {
                    $("#ddlCounty").append($("<option value='" + item.county_city_id + "'>" + item.county_name + "</option>"));
                })
            }
            else if (type == "town") {
                $.each(result, function (i, item) {
                    $("#ddlTown").append($("<option value='" + item.town_city_id + "'>" + item.town_name + "</option>"));
                })
            }
            else if (type == "village") {
                $("#ddlVillage").empty();
                $("#ddlVillage").append($("<option value='ALL'>ALL</option>"));
                $.each(result, function (i, item) {
                    $("#ddlVillage").append($("<option value='" + item.village_city_id + "'>" + item.village_city_id + "</option>"));
                })
            }
        },
        error: function (err) {
            alert("err:" + err);
        }
    });
}

function clearData(type) {
    if (type == "subregion") {
        $("#ddlSubRegion").empty();
        $("#ddlSubRegion").append($("<option value='ALL'>ALL</option>"));
        $("#ddlGrid").empty();
        $("#ddlGrid").append($("<option value='ALL'>ALL</option>"));
        $("#ddlPref").empty();
        $("#ddlPref").append($("<option value='ALL'>ALL</option>"));
        $("#ddlCity").empty();
        $("#ddlCity").append($("<option value='ALL'>ALL</option>"));
        $("#ddlCounty").empty();
        $("#ddlCounty").append($("<option value='ALL'>ALL</option>"));
        $("#ddlTown").empty();
        $("#ddlTown").append($("<option value='ALL'>ALL</option>"));
        $("#ddlVillage").empty();
        $("#ddlVillage").append($("<option value='ALL'>ALL</option>"));
    }
    else if (type == "grid") {
        $("#ddlGrid").empty();
        $("#ddlGrid").append($("<option value='ALL'>ALL</option>"));
        $("#ddlPref").empty();
        $("#ddlPref").append($("<option value='ALL'>ALL</option>"));
        $("#ddlCity").empty();
        $("#ddlCity").append($("<option value='ALL'>ALL</option>"));
        $("#ddlCounty").empty();
        $("#ddlCounty").append($("<option value='ALL'>ALL</option>"));
        $("#ddlTown").empty();
        $("#ddlTown").append($("<option value='ALL'>ALL</option>"));
        $("#ddlVillage").empty();
        $("#ddlVillage").append($("<option value='ALL'>ALL</option>"));
    }
    else if (type == "pref") {
        $("#ddlPref").empty();
        $("#ddlPref").append($("<option value='ALL'>ALL</option>"));
        $("#ddlCity").empty();
        $("#ddlCity").append($("<option value='ALL'>ALL</option>"));
        $("#ddlCounty").empty();
        $("#ddlCounty").append($("<option value='ALL'>ALL</option>"));
        $("#ddlTown").empty();
        $("#ddlTown").append($("<option value='ALL'>ALL</option>"));
        $("#ddlVillage").empty();
        $("#ddlVillage").append($("<option value='ALL'>ALL</option>"));
    }
    else if (type == "city") {
        $("#ddlCity").empty();
        $("#ddlCity").append($("<option value='ALL'>ALL</option>"));
        $("#ddlCounty").empty();
        $("#ddlCounty").append($("<option value='ALL'>ALL</option>"));
        $("#ddlTown").empty();
        $("#ddlTown").append($("<option value='ALL'>ALL</option>"));
        $("#ddlVillage").empty();
        $("#ddlVillage").append($("<option value='ALL'>ALL</option>"));
    }
    else if (type == "county") {
        $("#ddlCounty").empty();
        $("#ddlCounty").append($("<option value='ALL'>ALL</option>"));
        $("#ddlTown").empty();
        $("#ddlTown").append($("<option value='ALL'>ALL</option>"));
        $("#ddlVillage").empty();
        $("#ddlVillage").append($("<option value='ALL'>ALL</option>"));
    }
    else if (type == "town") {
        $("#ddlTown").empty();
        $("#ddlTown").append($("<option value='ALL'>ALL</option>"));
        $("#ddlVillage").empty();
        $("#ddlVillage").append($("<option value='ALL'>ALL</option>"));
    }
}

后台代码：

[System.Web.Services.WebMethod]
        public static string initData(string rgn_cd, string subrgn_cd, string grid_cd, string pref_cd, string city_id, string county_id, string town_id, string village_id, string type, string WWID)
        {
            //string rgn_cd,string subrgn_cd,string grid_cd,string pref_cd,string city_id,string county_id,string town_id,string village_id,
            SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["DSN"].DecodeBase64());

            SqlCommand cmd = new SqlCommand();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "region_subregion_grid_pref_city_county_town_village_by_wwid";
            cmd.Connection = conn;

            if (string.IsNullOrEmpty(rgn_cd) || rgn_cd == "null" || rgn_cd == "ALL")
            {
                cmd.Parameters.AddWithValue("@rgn_cd", DBNull.Value);
            }
            else
            {
                cmd.Parameters.AddWithValue("@rgn_cd", rgn_cd);
            }

            if (string.IsNullOrEmpty(subrgn_cd) || subrgn_cd == "null" || subrgn_cd == "ALL")
            {
                cmd.Parameters.AddWithValue("@subrgn_cd", DBNull.Value);
            }
            else
            {
                cmd.Parameters.AddWithValue("@subrgn_cd", subrgn_cd);
            }

            if (string.IsNullOrEmpty(grid_cd) || grid_cd == "null" || grid_cd == "ALL")
            {
                cmd.Parameters.AddWithValue("@grid_cd", DBNull.Value);
            }
            else
            {
                cmd.Parameters.AddWithValue("@grid_cd", grid_cd);
            }

            if (string.IsNullOrEmpty(pref_cd) || pref_cd == "null" || pref_cd == "ALL")
            {
                cmd.Parameters.AddWithValue("@pref_cd", DBNull.Value);
            }
            else
            {
                cmd.Parameters.AddWithValue("@pref_cd", pref_cd);
            }

            if (string.IsNullOrEmpty(city_id) || city_id == "null" || city_id == "ALL")
            {
                cmd.Parameters.AddWithValue("@city_id", DBNull.Value);
            }
            else
            {
                cmd.Parameters.AddWithValue("@city_id", city_id);
            }

            if (string.IsNullOrEmpty(county_id) || county_id == "null" || county_id == "ALL")
            {
                cmd.Parameters.AddWithValue("@county_id", DBNull.Value);
            }
            else
            {
                cmd.Parameters.AddWithValue("@county_id", city_id);
            }

            if (string.IsNullOrEmpty(town_id) || town_id == "null" || town_id == "ALL")
            {
                cmd.Parameters.AddWithValue("@town_id", DBNull.Value);
            }
            else
            {
                cmd.Parameters.AddWithValue("@town_id", town_id);
            }

            if (string.IsNullOrEmpty(village_id) || village_id == "null" || village_id == "ALL")
            {
                cmd.Parameters.AddWithValue("@village_id", DBNull.Value);
            }
            else
            {
                cmd.Parameters.AddWithValue("@village_id", village_id);
            }
            cmd.Parameters.AddWithValue("@type", type);
            cmd.Parameters.AddWithValue("@wwid", "");//((AccessControler)this.Session["_accessctrl"]).GetWWID()); 

            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = cmd;

            DataTable dt = new DataTable();

            conn.Open();
            da.Fill(dt);
            //this.HiddenRegion.Text = JsonConvert.SerializeObject(dt);

            conn.Close();
            da.Dispose();
            cmd.Dispose();

            return JsonConvert.SerializeObject(dt);
        }