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How to validate checkboxlist for atleast a single item to be selected..??

Posted on 2009-03-30
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Last Modified: 2013-11-07
I need to validate for atleast a single checkboxlist is to be selected using Javascript not by required field validator..
.and also do the same in server side validation....i binded the checkboxlist..plz sugest

<asp:CheckBoxList ID="CheckBoxList1" runat="server"  RepeatColumns="2">

        </asp:CheckBoxList>&nbsp;

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Question by:Rajar Ahmed
  • 2
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4 Comments
 
LVL 16

Expert Comment

by:sunithnair
ID: 24017731
Try like this
ASPX
 

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default2.aspx.vb" Inherits="Default2" %>
 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 

<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

    <title>Untitled Page</title>

    <script type="text/javascript">

        function Validate()

        {

            var checkBoxes = document.getElementsByTagName("input");

            var isValid = false;

            for(var i=0;i<checkBoxes.length;i++)

            {

                if(checkBoxes[i].type=="checkbox" && checkBoxes[i].id.indexOf("CheckBoxList1")!=0)

                {

                    isValid = true;

                    break;

                }

            }

            if(!isValid)

            {

                alert("Please select atleast one value");

            }

            return isValid;

        }

    </script>

</head>

<body>

    <form id="form1" runat="server">

        <asp:CheckBoxList ID="CheckBoxList1" runat="server"  RepeatColumns="2">

        </asp:CheckBoxList>

        <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClientClick="return Validate();" />

    </form>

</body>

</html>
 
 

CODEBEHIND
 
 

Partial Class Default2

    Inherits System.Web.UI.Page

    Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load

        If Not IsPostBack Then

            CheckBoxList1.DataSource = System.IO.Directory.GetFiles("C:\\")

            CheckBoxList1.DataBind()

        End If

    End Sub
 

    Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSubmit.Click

        If CheckBoxList1.SelectedIndex = -1 Then

            Response.Write("Nothing is selected")

        End If
 

    End Sub

End Class

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Author Comment

by:Rajar Ahmed
ID: 24017972
server side is fine ,,.. but clientside i get message of 'Please select atleast one value' even if checkbox is selected...
 
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LVL 16

Accepted Solution

by:
sunithnair earned 500 total points
ID: 24018031
Sorry the script should be like this
    <script type="text/javascript">

        function Validate()

        {

            var checkBoxes = document.getElementsByTagName("input");

            var isValid = false;

            for(var i=0;i<checkBoxes.length;i++)

            {

                if(checkBoxes[i].type=="checkbox" && checkBoxes[i].id.indexOf("CheckBoxList1")==0 && checkBoxes[i].checked)

                {

                    isValid = true;

                    break;

                }

            }

            if(!isValid)

            {

                alert("Please select atleast one value");

            }

            return isValid;

        }

    </script>

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LVL 18

Author Closing Comment

by:Rajar Ahmed
ID: 31564273
Thanks Mate...
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