如何避免错误'一个页面只能有一个服务器端的Form标签'。 [英] How to avoid error 'a page can have only one server-side Form tag'.?

问题描述

i有一个用户控制页面如下

 <  ！DOCTYPE     html     PUBLIC     -  // W3C // DTD     XHTML     1.0    < span class =code-attribute> Transitional // EN   http：//www.w3 .org / TR / xhtml1 / DTD / xhtml1-transitional.dtd >  
 
 
 
 <   div     id   =  header    class   =  header >  
 <   h1     class   = < span class =code-keyword> h1 >  TrackU：学生和车辆跟踪系统<   / h1  >  
  <  表格    runat   =  server    id   =  fomr2  >  
 <   p     class   =  p >  <   asp：LinkBut​​ton     runat   =  server    ID   =  logBtn    ForeColor   = 白色   文本  = 退出 >  <   / asp：LinkBut​​ton  >  <   / p  >  
 <   / form  >  
 <  < span class =code-leadattribute> / div  >  
 <   div  >  
 <   ul     class   =  ul >  
 <   li     class   =  li >  <   a     class   =  lia    href   =  / Admin / Fleet.aspx >  Fleet <  < span class =code-leadattribute> / a  >  <   / li  >  
 <   li     class   =  li >  <   a     class   =  lia    href   =  / Admin / StudentInfo.aspx > 学生资讯<   / a  >  <   / li  >  
 <   li     class   =  li >  <   a     class   =  lia    href   =  / Admin / RouteSettings.aspx > 路线设置<   / a  >  <   / li  & gt;  
 <   li     class   =  li >  <   a  < span class =code-attribute>   class   =  lia    href   =   / Admin / Reports.aspx > 报告<   / a  >  <   / li  >  
 <   / ul  >  
 <   / div  >  
 

和带有usercontrol的aspx页面如下，

 <％@     Page    语言  =  C＃    AutoEventWireup   =  true    CodeBehind   =  Fleet.aspx.cs   继承  =  M2iSTS2 .Admin.Fleet11   ％>  
 
 <  ！DOCTYPE     html     PUBLIC     -  // W3C // DTD     XHTML     1.0     Transitional // EN   http://www.w3.org/ TR / xhtml1 / DTD / xhtml1-transitional.dtd >  
 <％@    注册    src   =  〜/ UserControl / Header.ascx    TagName   = 标题    TagPrefix   =  UserControl   ％>  
 <％@    注册    src   = 〜/ UserControl / Footer.as cx    TagName   = 页脚    TagPrefix   =  UserControl   ％>  
 
 
 <   html     xmlns   =  http://www.w3.org/1999/xhtml >  
 <   head     runat   =  server &g t;  
 <   title  >  <   / title  > ;  
 <   link     rel   = 样式表    href   =  http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.10/themes/redmond/jquery-ui.css    /  >  
 
 <   / head  >  
 
 <跨度class =code-keyword><   body  >  
 
 <   UserControl：Header     ID   = 标题      runat   =  server  /  >  
 <  表格    id   =  form1 < span class =code-attribute>   runat   = 服务器 >  
 
 <   asp：ScriptManager     ID   =  ScriptManager1    runat   =  server >  
 <   / asp：ScriptManager  >  
 
 <  表    border   =  1 >  
 <   tr  >  
 <   td     style   =  width：250px; height：100％; background-color：＃ CEF >  
 
 <   asp：UpdatePanel     runat   =  server    ID   =  updatePanel1 >  
 <   ContentTemplate  >  
 <  表    align   =   center >  
  <   tr  >  
 
 <   tr  >  
 <   td  >  
 <   asp：ImageButton     ID   =  vehiclelistBtn    runat   =  server    
   
                < span class =code-attribute>                                       ImageUrl   = 〜/ image / vehiclelist_btn.png    onclick   =  vehiclelistBtn_Click    /  >  
 <   / td  >  
 <   / tr  >  
 <   tr  >  
 <   td  >  
 <   asp：ImageButton     ID   =  driverlistBtn    runat   = 服务器    
   
                              < span class =code-attribute>                         ImageUrl   = 〜/ image / driver_list.png    onclick   =  driverlistBtn_Click     /  >  
 <   / td  >  
 <   / tr  >  
 
 <   / tr  >  
 <   / table  >  
 <   / ContentTemplate  >  
 <   / asp：UpdatePanel  >  
 
 <   / td  > ;  
 <   td     style   =  width：100％;高度：100％ >  
 <   div       id     =  map_canvas < span class =code-attribute>   styl e   = 身高：635px > ;  
 
 <   / div  >  
 
 <   / td  >  
 <   / tr  >  
 <   /表格 >  
 
 
 <  < span class =code-leadattribute> UserControl：Footer     ID   =  Footer1      runat   =  server    /  >  
 <   / form  >  
 
 <   / body  >  
 <   / html  >  

但它给出了错误



一个页面只能有一个服务器端的Form标签。



如何避免这种情况？



谢谢..

解决方案

Usercontrol 永远不会有 Form 标记。当您在页面中使用 UserControl 时，它将自动通过您的页面获取表单标签。





注意：页面中只能有一个表格标签。





谢谢

你必须：



1.从ascx页面删除表格标签（用户控制）

2.放置用户控制主aspx页面上的表单标签，如下所示：

 <  表格    id   =  form1    runat   =  server < span class =code-keyword>>  
 <   usercontrol：header     id   =  标题    runat   =  server    xmlns：usercontrol   = ＃unknown >  <   / usercontrol：header  >  <   / form  >  

问候

爬完

Hi,

i have a usercontrol page as below

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">



<div id="header" class="header">
   <h1 class="h1">TrackU: Student and Vehicle Tracking System</h1>
    <form runat="server" id="fomr2">
    <p class="p"><asp:LinkButton runat="server" ID="logBtn" ForeColor="White" Text="Logout"></asp:LinkButton></p>
    </form>
 </div>
 <div>
   <ul class="ul">
       <li class="li"><a class="lia" href="/Admin/Fleet.aspx">Fleet</a></li>
       <li class="li"><a class="lia" href="/Admin/StudentInfo.aspx">Student Info</a></li>
       <li class="li"><a class="lia" href="/Admin/RouteSettings.aspx">Route Settings</a></li>
       <li class="li"><a class="lia" href="/Admin/Reports.aspx">Reports</a></li>
   </ul>
 </div>

and the aspx page with usercontrol as below,

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Fleet.aspx.cs" Inherits="M2iSTS2.Admin.Fleet11" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Register src="~/UserControl/Header.ascx" TagName="Header" TagPrefix="UserControl" %>
<%@ Register src="~/UserControl/Footer.ascx" TagName="Footer" TagPrefix="UserControl" %>


<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <link rel="Stylesheet" href="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.10/themes/redmond/jquery-ui.css" />  
   
</head>

<body>
    
    <UserControl:Header ID="Header"  runat="server"/> 
    <form id="form1" runat="server">
    
     <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>  
   
<table border="1">
    <tr>
       <td style="width:250px;height:100%;background-color: #CEF">         
          
          <asp:UpdatePanel runat="server" ID="updatePanel1">
          <ContentTemplate>    
          <table align="center">
          <tr>             
              
              <tr>
                  <td>
                      <asp:ImageButton ID="vehiclelistBtn" runat="server" 

                          ImageUrl="~/image/vehiclelist_btn.png" onclick="vehiclelistBtn_Click" />
                  </td>
              </tr>
              <tr>
                  <td>
                      <asp:ImageButton ID="driverlistBtn" runat="server" 

                          ImageUrl="~/image/driver_list.png" onclick="driverlistBtn_Click" />
                  </td>
              </tr>
             
          </tr>
           </table>   
          </ContentTemplate>
          </asp:UpdatePanel>                    
         
       </td>
       <td style="width:100%;height:100%">       
       <div  id ="map_canvas" style="height:635px">
       
       </div>   
                    
       </td>
   </tr>
 </table>

 
    <UserControl:Footer ID="Footer1"  runat="server" />
    </form>
   
</body>
</html>

But it giving error as

A page can have only one server-side Form tag.

How to avoid this?

Thanks..

解决方案

An Usercontrol never have the Form tag. when you use UserControl in your page it will automatically get the form tag through your page.


Note: There must be only only one form tag in a page.


Thanks

you must:

1. remove the form tag from the ascx page (user control)
2. Place the user control between the form tags on the main aspx page like this:

<form id="form1" runat="server">
 <usercontrol:header id="Header" runat="server" xmlns:usercontrol="#unknown"> </usercontrol:header></form>

Regards
Pawan

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