使用CustomValidator对asp.net Single-CheckBox进行客户端验证的JavaScript [英] JavaScript for Clientside validation for asp.net Single-CheckBox using CustomValidator

问题描述

我正在尝试使用以下代码验证该复选框.
但是它总是返回false.
//----------------------------------------

I am trying to validate the check box using the following code.
But it is always return false.
//----------------------------------------

<script  language="javascript" type ="text/javascript" >
       function checkAgreement(source, args)
        {
         var elem = document.getElementById("cbxPDCheque");
         if (elem.checked)
          {
          args.IsValid = true;
          }
          else
          {
          args.IsValid = false;
          }
        }
        </script>

//================================================ =====

//=====================================================

<asp:CheckBox ID="cbxPDCheque" runat="server" AutoPostBack="True" Text="PD Cheques" />
  <asp:CustomValidator ID="CustomValidator1" runat="server" EnableClientScript ="true"

  ErrorMessage="Select PD Cheques."  ClientValidationFunction ="checkAgreement" >*</asp:CustomValidator>
  <asp:ValidationSummary ID="ValidationSummary1" runat="server" ShowMessageBox="True" ShowSummary="False" />
  <asp:Button ID="Button1" runat="server" Text="Button" />

//================================================ =======

//=======================================================

推荐答案

我认为您的ClientID错误.

I reckon your ClientID is wrong.

var elem = document.getElementById("cbxPDCheque");

您需要查看页面的源代码以找出CheckBox的正确ClientID.服务器控件的ID不必与在浏览器中呈现的DOM属性ID相同.

You need to view the source of your page to find out the correct ClientID of the CheckBox. The ID of a server Control is not necessarily the same as the DOM attribute ID that gets rendered in the browser.

var elem = document.getElementById("<%=cbxPDCheque.ClientID%>");

因为控件的ID在渲染后已更改.

Because the ID of the controls is changed after rendering.

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