Visual studio 魔法密码？！-。aspx字段丢失&从源代码中消失

我在处理.ASPX页面上的一些表单元素时遇到了一个非常奇怪的问题。。页面表单在单击div时有一个隐藏的幻灯片，允许用户“预订”

用于制作幻灯片动画的jQuery工作正常，只需单击勾选复选框id=rescheck即可

问题是，不是隐藏div中包含的所有字段都会在单击复选框时显示，从而与标签一起滑入视图，而是只显示一个文本字段输入，而不显示其他内容。检查源代码表明，这些缺少的标签和字段甚至不在源代码中，在MS Visual Studio 2008中查看和编辑时，显示在页面代码中

如您所见，字段及其标签似乎在浏览器中消失了！我不知道这是什么原因，也不知道下一步该怎么办

这是我的页面代码，来自Visual Studio：

<fieldset id="resreq">
<legend>Make a Reservation?</legend>
    <label for="rescheck" class="rescheck">If you would like to reserve a table     at Madrasi check here:</label>
    <input id="rescheck" type="checkbox" class="rescheck" runat="server" />            

    <div id="reservationfields">
        <div id="res_when">
        <div>
            <asp:Label ID="lblDate" runat="server" AssociatedControlID="txtDate">On which date would you like us to reserve your table?</asp:Label>
               <asp:TextBox ID="txtDate" runat="server" CssClass="res_date" />                   
            </div>
            <div>
                <asp:Label ID="lblTime" runat="server">and for what time?</asp:Label>
                <asp:TextBox ID="txtTime" runat="server" CssClass="res_time" />                  
         </div>                    
        </div><!-- close res_when -->
        <div> 
            <asp:Label ID="lblBranch" runat="server">At which restaurant would you like to make your reservation?</asp:Label>
            <asp:DropDownList ID="ddlBranch" runat="server">
                <asp:ListItem Text="Select a Restaurant" Value="" />
                <asp:ListItem Text="Restaurant 1" Value="Restaurant 1" />
                <asp:ListItem Text="Restaurant 2" Value="Restaurant 2" />
            </asp:DropDownList>
        </div>
        <div>
            <asp:Label ID="lblPeople" runat="server" AssociatedControlID="txtPeople" Text="Number of Guests:" />
            <asp:TextBox ID="txtPeople" runat="server" />  
        </div>
        <div>
            <asp:Label ID="lblDOB" runat="server" AssociatedControlID="txtDOB">Date of Birth:</asp:Label>
            <asp:TextBox ID="txtDOB" runat="server" />                   
        </div>
    </div><!-- close reservation fields -->
</fieldset>

…这是在浏览器中“查看源代码”时的源代码：

    <fieldset id="resreq">

    <legend>Make a Reservation?</legend>

        <label for="rescheck" class="rescheck">If you would like to reserve a table at Madrasi check here:</label>

        <input name="ctl00$cpcMain$rescheck" type="checkbox" id="ctl00_cpcMain_rescheck" class="rescheck" />        

        <div id="reservationfields">

         <div id="res_when">

          <div>



                 <input name="ctl00$cpcMain$txtDate" type="text" id="ctl00_cpcMain_txtDate" class="res_date" />                   

             </div>

             <div>





 </div>                    

          </div>

            <div> 





            </div>

            <div>





            </div>

            <div>





                <span id="ctl00_cpcMain_rvDOB" style="color:Red;visibility:hidden;">You have entered your Date of Birth incorrectly (dd/mm/yyyy).</span>

            </div>
            </div><!-- close reservation fields -->
    </fieldset>

---

codebehind中是否有任何东西将任何控件的Visible属性设置为false？这会导致控件根本不在HTML中呈现，而不是将其置于不可见状态，这可能会让人非常困惑，因为许多人都不希望出现这种情况。

我在文档结尾处有这样一点：我也尝试删除下面的脚本片段，但这与函数showmeit，box没有任何区别{var vis=box.checked？块：无；document.getElementByIdit.style.display=vis；}