js重写页面之后后台如何获取重写后的控件值

需求描述：专业分流系统中，学生在选择志愿时，我想实现在页面按照点击相应专业的顺序来设置选专业的志愿，如首先点击“工商”，则工商专业为第一志愿，接着点击“营销”，则营销专业为第二志愿，以此类推。从而达到所选志愿不会重复的效果。以下是我的实现方法。

html控件用js赋值之后可以在页面中显示，但后台无法获取改变之后的值。因此我用了一个比较笨的办法，就是加一个隐藏的服务器控件，后台用Request.Form方法取这个隐藏控件的值。大佬们有更好的方法欢迎赐教。

JS

   <script type="text/javascript">
         $(".chooseitem").click(function () {
             var thisText = $(this).text();
             var aLength = $(".selected").length;
             var thisDataId = $(this).attr("data-id");

             if ($(this).hasClass("whitesmoke")) {
                 return false;
             }
             $(this).addClass("whitesmoke");
             $(".tdlable").eq(aLength).html("<label class='ddl selected' data-id='" + thisDataId + "' id='Label" + thisDataId + "'>" + thisText + "</label>");
             $(".hiddenddl").eq(aLength).val(thisDataId);
         });;
         function cancel() {
             $(".chooseitem").removeClass("whitesmoke");
             $(".ddl").empty();
         }
     </script>

前台代码

      <div class="choose">
                        <div class="chooseitem"  data-id="1">人力</div>
                        <div class="chooseitem"  data-id="2">信管</div>
                        <div class="chooseitem"  data-id="3">工商</div>
                        <div class="chooseitem"  data-id="4">营销</div>
                        <div class="chooseitem"  data-id="5">公管</div>
                        <div class="chooseitem"  data-id="6">财务ACCA</div>
                        <div class="chooseitem"  data-id="7">会计</div>
                    </div>
                    <div id="wish">
                    <table>
                        <tr>
                            <td class="td1">第一志愿：</td>
                            <td class="tdlable"></td>                
                        </tr>
                        <tr>
                            <td class="td1">第二志愿：</td>
                            <td class="tdlable"></td>
                        </tr>
                        <tr>
                            <td class="td1">第三志愿：</td>
                            <td class="tdlable"></td>
                        </tr>
                        <tr>
                            <td class="td1">第四志愿：</td>
                            <td class="tdlable"></td>
                        </tr>
                        <tr>
                            <td class="td1">第五志愿：</td>
                            <td class="tdlable"></td>
                        </tr>
                        <tr>
                            <td class="td1">第六志愿：</td>
                            <td class="tdlable"></td>
                        </tr>
                        <tr>
                            <td class="td1">第七志愿：</td>
                            <td class="tdlable"></td>
                        </tr>
                        <tr style="height:50px">
                            <td colspan="2" style="text-align:center;">
                                <asp:Button ID="btnSave" runat="server" Text="保存"  OnClick="btnSaveClick"/>
                                 <asp:Button ID="btnCancel" runat="server" Text="重新选择" OnClientClick="cancel();"/>
                            </td>
                        </tr>
                    </table>
                    </div>
                </div>
             </div>
               <table class="hiddenTb">    //这里设置display=none
                  
                        <tr>
                            <td class="td1">第一志愿：</td>
                            <td><asp:DropDownList ID="ddlOne" runat="server" CssClass="hiddenddl" ></asp:DropDownList></td>
                        </tr>
                        <tr>
                            <td class="td1">第二志愿：</td>
                            <td><asp:DropDownList ID="ddlTwo" runat="server" CssClass="hiddenddl" ></asp:DropDownList></td>
                        </tr>
                        <tr>
                            <td class="td1">第三志愿：</td>
                            <td><asp:DropDownList ID="ddlThree" runat="server" CssClass="hiddenddl" ></asp:DropDownList></td>
                        </tr>
                        <tr>
                            <td class="td1">第四志愿：</td>
                            <td><asp:DropDownList ID="ddlFour" runat="server" CssClass="hiddenddl" ></asp:DropDownList></td>
                        </tr>
                        <tr>
                            <td class="td1">第五志愿：</td>
                            <td><asp:DropDownList ID="ddlFive" runat="server" CssClass="hiddenddl" ></asp:DropDownList></td>
                        </tr>
                        <tr>
                            <td class="td1">第六志愿：</td>
                            <td><asp:DropDownList ID="ddlSix" runat="server" CssClass="hiddenddl" ></asp:DropDownList></td>
                        </tr>
                        <tr>
                            <td class="td1">第七志愿：</td>
                            <td><asp:DropDownList ID="ddlSeven" runat="server" CssClass="hiddenddl" ></asp:DropDownList></td>
                        </tr>
                    </table>
        </div>

后台代码

    protected void LoadData()
        {
            int StuID = Convert.ToInt32(Session["UserNo"].ToString());
            DepartmentMIS.Model.StuInfo StuModel = StuBLL.GetModel(StuID);

              //给隐藏控件绑定值，方便后续取值
            ddlOne.DataSource = DepBLL.GetList("isDeleted = 0");
            ddlOne.DataTextField = "department";
            ddlOne.DataValueField = "id";
            ddlOne.DataBind();
            if (StuModel.department1.ToString() != "")
            {
                ddlOne.SelectedValue = StuModel.department1.ToString();
            }
            else { ddlOne.SelectedValue = "1"; }

            ddlTwo.DataSource = DepBLL.GetList("isDeleted = 0");
            ddlTwo.DataTextField = "department";
            ddlTwo.DataValueField = "id";
            ddlTwo.DataBind();
            if (StuModel.department2.ToString() != "")
            {
                ddlTwo.SelectedValue = StuModel.department2.ToString();
            }
            else { ddlTwo.SelectedValue = "2"; }

            ddlThree.DataSource = DepBLL.GetList("isDeleted = 0");
            ddlThree.DataTextField = "department";
            ddlThree.DataValueField = "id";
            ddlThree.DataBind();
            if (StuModel.department3.ToString() != "")
            {
                ddlThree.SelectedValue = StuModel.department3.ToString();
            }
            else { ddlThree.SelectedValue = "3"; }

            ddlFour.DataSource = DepBLL.GetList("isDeleted = 0");
            ddlFour.DataTextField = "department";
            ddlFour.DataValueField = "id";
            ddlFour.DataBind();
            if (StuModel.department4.ToString() != "")
            {
                ddlFour.SelectedValue = StuModel.department4.ToString();
            }
            else { ddlFour.SelectedValue = "4"; }

            ddlFive.DataSource = DepBLL.GetList("isDeleted = 0");
            ddlFive.DataTextField = "department";
            ddlFive.DataValueField = "id";
            ddlFive.DataBind();
            if (StuModel.department5.ToString() != "")
            {
                ddlFive.SelectedValue = StuModel.department5.ToString();
            }
            else { ddlFive.SelectedValue = "5"; }

            ddlSix.DataSource = DepBLL.GetList("isDeleted = 0");
            ddlSix.DataTextField = "department";
            ddlSix.DataValueField = "id";
            ddlSix.DataBind();
            if (StuModel.department6.ToString() != "")
            {
                ddlSix.SelectedValue = StuModel.department6.ToString();
            }
            else { ddlSix.SelectedValue = "6"; }

            ddlSeven.DataSource = DepBLL.GetList("isDeleted = 0");
            ddlSeven.DataTextField = "department";
            ddlSeven.DataValueField = "id";
            ddlSeven.DataBind();
            if (StuModel.department7.ToString() != "")
            {
                ddlSeven.SelectedValue = StuModel.department7.ToString();
            }
            else { ddlSeven.SelectedValue = "7"; }
        }

        protected void btnSaveClick(object sender, EventArgs e)
        {

            int StuID = Convert.ToInt32(Session["UserNo"].ToString());

            DepartmentMIS.Model.StuInfo StuModel = StuBLL.GetModel(StuID);


            StuModel.department1 = Convert.ToInt32(Request.Form[ddlOne.ClientID]);
            StuModel.department2 = Convert.ToInt32(Request.Form[ddlTwo.ClientID]);
            StuModel.department3 = Convert.ToInt32(Request.Form[ddlThree.ClientID]);
            StuModel.department4 = Convert.ToInt32(Request.Form[ddlFour.ClientID]); ;
            StuModel.department5 = Convert.ToInt32(Request.Form[ddlFive.ClientID]);
            StuModel.department6 = Convert.ToInt32(Request.Form[ddlSix.ClientID]);
            StuModel.department7 = Convert.ToInt32(Request.Form[ddlSeven.ClientID]);

            StuModel.updateTime = DateTime.Now;

            StuBLL.Update(StuModel);
            Response.Redirect("stuWishChoices.aspx");

        }