使用CustomValidator对asp.net Single

本文介绍了使用CustomValidator对asp Single-CheckBox进行客户端验证的JavaScript的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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>

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<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" />

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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.