不要求FileUpload的字段验证工作？ [英] Wont required field validator work for a FileUpload?

问题描述

我尽力为我的FileUpload采用必需的字段验证器。它不起作用。任何人都可以指导我。

  - ％> <   asp：Panel     ID   =   Panel117    runat   =  server  
   
                   style   =  border-width：1px; border-style：solid; top：400px; left： 1185px;位置：绝对;身高：161px;宽度：279px;背景色：InactiveBorder; border-color：黑色 >  
 
 <   asp：图像    ID   =  ImagePreview    runat   =  server   高度  =  97px   宽度  =  99px  
   
                           style   =   z-index：1  /   >  
 <   asp：FileUpload     ID   =  PhotoUpload     runat   = < span class =code-keyword> server  
   
                               style   =  z-指数：1;左：100px的;上：53px;位置：绝对;身高：46px;宽度：218px;右：90px;    /  >  
 <   asp：按钮    ID   =  Button7    runat   =  server    CausesValidation   =  False  
   
                    < span class =code-attribute>       onclick   =  Showbutton_Click  
   
                           style   =  z-指数：1;左：7px;上：123px;位置：绝对  
   
                          文字  = 显示    /  >  
 
 <   / asp：Panel  >  
 
 <％  -  < /   ContentTemplate  >   - ％> 
 <  触发器 >  
 <％  - < asp：AsyncPostBackTrigger ControlID =   Button3 EventName =  点击 />  - ％>  
 <   asp：PostBackTrigger     ControlID   = < span class =code-keyword> Button2    /  >  
 <   / Triggers  >  
 <％  -  < /   asp：UpdatePanel  >   - ％GT; 
 
 
 <   asp：requiredfieldvalidator     id   =  rfvWeeklyCommentary    runat   =  server    controltovalidate   =  PhotoUpload  
   
     errormessage   = 选择一个照片。  
   
   setfocusonerror   =  true >  
 <   / asp：requiredfieldvalidator  > ;  

解决方案

输入（文件）是一个HTML控件，因此您需要将其作为服务器控件运行，然后在代码隐藏上验证它。如果您不想将其设置为服务器控件，则可以在客户端使用JavaScript / jQuery对其进行验证。

例如，

  var  fileUpload = 

（ * [id

='fileUpload'] ）VAL（）;
if （fileUpload == ）{
// 在此进行验证
}

I tried my level best to adopt a required field validator for my FileUpload. It is not working. Can anyone guide me please.

--%><asp:Panel ID="Panel117" runat="server"

        style="border-width: 1px; border-style: solid; top: 400px; left: 1185px; position: absolute; height: 161px; width: 279px; background-color:InactiveBorder; border-color:Black">

            <asp:Image ID="ImagePreview" runat="server" Height="97px" Width="99px"

            style="z-index: 1"/>
            <asp:FileUpload ID="PhotoUpload" runat="server"

              style="z-index: 1; left:100px; top: 53px; position: absolute; height: 46px; width: 218px; right: 90px;" />
           <asp:Button ID="Button7" runat="server" CausesValidation="False"

            onclick="Showbutton_Click"

            style="z-index: 1; left: 7px; top: 123px; position: absolute"

            Text="Show" />

</asp:Panel>

<%--</ContentTemplate>--%>
<Triggers>
<%--<asp:AsyncPostBackTrigger ControlID="Button3" EventName="Click" />--%>
<asp:PostBackTrigger ControlID="Button2" />
</Triggers>
<%--</asp:UpdatePanel>--%>


    <asp:requiredfieldvalidator id="rfvWeeklyCommentary" runat="server" controltovalidate="PhotoUpload"

 errormessage="Select a foto."

setfocusonerror="true">
</asp:requiredfieldvalidator>

解决方案

Input (File) is an HTML control, so you will need to run it as a server control and then validate it on the code-behind. If you don''t want to set it a server control, you can validate it using JavaScript/jQuery in the client-side.
For instance,

var fileUpload =

("*[id

='fileUpload ']").val(); if(fileUpload == ""){ //Do your validation here }

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