如何解决modalpopupextender的问题 [英] How do I resolve an issue with modalpopupextender

问题描述

我的aspx页面上有以下代码段：

I have the following snippet on my aspx page:

<td>
   <asp:DropDownList ID="ddlChildOrder" runat="server"></asp:DropDownList>
     
   <asp:Button ID="btnBullets" runat="server" Text="Bullets" />
   <asp:Button ID="btnLinks" runat="server" Text="Links" />
   <asp:Button ID="btnText" runat="server"  OnClick="btnText_OnClick" Text="Text" />
   <asp:Button ID="btnVideos" runat="server"   Text="Videos" />
   <ajx:ModalPopupExtender ID="ModalPopupVideo" PopupControlID="panelVideo"
                      TargetControlID="btnVideos" CancelControlID="btnCloseVideoPanel"
                      BackgroundCssClass="modalBackground" runat="server" />
</td>

及其应该弹出的面板在页面上显示：

and the panel it should popup is further down on the page:

asp:Panel Width="1500" Height="250" ID="panelVideo"  runat="server">
     <div class="modal-content">
        <div class="modal-header">
           <asp:Button ID="btnCloseVideoPanel" Text="X" CssClass="closeWin"  runat="server" />
     <h2>
       <asp:Label ID="lblTitle" Text="Videos" runat="server"></asp:Label>
     </h2>
     </div>
.....

为什么我收到此错误？

TargetControlID' '无效。该值不能为null或为空。



该物业被分配到一个现有的按钮。事实上，该物业的智能感知将其列为一个选项



我尝试了什么：



谷歌搜索我的大脑受到了很大的伤害

why an I getting this error?
TargetControlID of '' is not valid. The value cannot be null or empty.

the property is assigned to an existing button., In fact intellisense for the property listed it as an option

What I have tried:

So much googling my brain hurts

推荐答案

没关系错误是

validatorcalloutextender

我盲目地粘贴到我的代码而不理解它的用法

which I blindly pasted in to my code without understanding it's use

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