如何使用javascript验证验证asp.net控件中的复选框列表 [英] how to validate checkbox list in asp.net controls using javascript validation

问题描述

请告诉我如何使用javascript validation验证asp.net控件中的复选框。如果未选中该复选框，则应显示错误消息。

please tell how to validate the checkbox in asp.net control using javascript validation.if the checkbox is not selected it should display an error message.

推荐答案

您好，



这是使用customvalidator的解决方案，不是完全javascript解决方案，但也许可以使用：



http://www.4guysfromrolla.com/webtech/tips/t040302-1.shtml [ ^ ]



或



与自定义验证器和一小段javscript一起代码如下：

Hi,

Here's is a solution using customvalidator, not entirely javascript solution, but maybe it could be used:

http://www.4guysfromrolla.com/webtech/tips/t040302-1.shtml[^]

Or

Together with a custom validator and a small piece of javscript as code below:

function validate(source, arguments) {
           arguments.IsValid = false;

           var checklist = document.getElementById("MyCheckBoxList");
           if (checklist == null) return;

           var elements = checklist.getElementsByTagName("INPUT");
           if (elements == null) return;

           var checkBoxCount = 0;
           for (i = 0; i < elements.length; i++) {
               if (elements[i].checked) checkBoxCount++;
           }
           arguments.IsValid = (checkBoxCount > 0);
       }

<asp:CustomValidator ID="CustomValidator1" runat="server"

            ClientValidationFunction="validate" ErrorMessage="One of the checkboxes needs to be checked!"

            ValidationGroup=""></asp:CustomValidator>

问候

Joachim

Regards
Joachim

Write the bellow code with in validation funtion in javascript
var chkControl= document.getElementById("<%chk.ClientID%>"); 

if(!chkControl.checked )
{
alert("Required to Check!!")
}

将以下Javascript放入函数函数ValidateForm（form）

Put the following Javascript in your function function ValidateForm(form)

if ( form.terms.checked == false ) 
{ 
       alert ( "Please check the Conditions box." ); 
       return false; 
}

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