how to validate a checkboxlist in asp.net

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ASP.NET

Hi All,

How to validate a checkbox List in asp.net.

Thanks
Mohd. Wasif

Posted 28-Aug-11 23:06pm

Mohd Wasif

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4 solutions

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koolprasad2003 · Answer 1 · 2011-08-28T23:35:00

you need to use javascript, write a function in javascript as below, it will validate checkbox list

JavaScript

<script language="javascript" type="text/javascript"> 
function ValidateASPControls() 
    { 
        var oItems;

        oItems=document.getElementById("oItems"); 
        var chkList = oItems.getElementsByTagName("input"); 
        chkFlag=0; 
        
        for (var i = 0; i < chkList.length; i++) 
        { 
            if(chkList[i].checked) 
            { 
             chkFlag=1; 
            } 
        } 
         
        if (chkFlag==0) 
        { 
            alert("Please select an item") 
            return false; 
        } 
         
   } 
</script>

Sudip Saha · Answer 2 · 2011-08-28T23:29:00

Solution 1

You can't use any validation control on the check box list,
only you can do the validation using the

VB

JavaScript or in code behind u have to write your own validation logic

Posted 28-Aug-11 23:29pm

Sudip Saha

anju_shrivastava · Answer 3 · 2012-09-25T03:30:00

XML

function ValidateModuleList(source, args) {
              var chklist = document.getElementById('<%= chklist.ClientID %>');
              var chkListinputs = chklist.getElementsByTagName("input");
              for (var i = 0; i < chkListinputs.length; i++) {
                  if (chkListinputs[i].checked) {
                      args.IsValid = true;
                      return;
                  }
              }
              args.IsValid = false;
          }


<asp:CheckBoxList ID="chklist" runat="server"></asp:CheckBoxList>
    <asp:CustomValidator  runat="server" ID="cvmodulelist" ForeColor="Red"
 ClientValidationFunction="ValidateModuleList"
 ErrorMessage="Please select atleast one service scenario" ></asp:CustomValidator>

mksharma38 · Answer 4 · 2012-09-26T00:46:00

Please explain you question in details so that other one can help you

C#

<script>
       function ValidateCheckBoxList() {

           var listItems = document.getElementById("CheckBoxList1").getElementsByTagName("input");
           var itemcount = listItems.length;
           var iCount = 0;
           var isItemSelected = false;
           for (iCount = 0; iCount < itemcount; iCount++)
           {
               if (listItems[iCount].checked)
               {
                   isItemSelected = true;
                   break;
               }
           }
           if (!isItemSelected) {
               alert("Please select an Item.");
           }
           else {
               return true;
           }
           return false;
       }
   </script>

XML

<asp:CheckBoxList ID="CheckBoxList1" runat="server">
        <asp:ListItem>a</asp:ListItem>
        <asp:ListItem>b</asp:ListItem>
        <asp:ListItem>c</asp:ListItem>
        </asp:CheckBoxList>
        <asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return ValidateCheckBoxList()" />

how to validate a checkboxlist in asp.net

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