How can i validate check box?

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I want to validate checkbox in my project.
Am using following code,

C#

protected void buttonOk_Click(object sender, EventArgs e)
        {
            if (!chkbox.Checked)
            {
                 buttonOkk.Attributes.Add("OnClick",
                "javascript:return chkbox()");
            }
            else
            {
                Response.Redirect(xxxxx, false);
            }
        }

XML

<head id="Head1" runat="server">
    <title>xxxx Page</title>

   <script type="text/javascript">
  function checkCheckBoxes()
  {
        alert ('Please check');
  }

 </script>

</head>

but while am running the code in my page when i check first time without checking check box it is not showing alert.But second time when i do same am getting alert.
Am getting alert message for both case (Checked/unchecked). I want to show alert only if checkbox is unchecked.
please let me know the solution fast.
please share if you have any good ideas.
Can i show error message using c# code?

Posted 15-May-13 20:07pm

Am Gayathri

Updated 15-May-13 20:11pm

Maciej Los

v2

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Am Gayathri 16-May-13 2:52am

What could be the reason for above case?

2 solutions

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RelicV · Answer 1 · 2013-05-15T20:16:00

Solution 1

Hi Kavitha,

If you can use jQuery in you project, then please look into the below link for example.
http://jsfiddle.net/M9dXx/[^]

Thank you,
Vamsi

Posted 15-May-13 20:16pm

RelicV

Comments

Am Gayathri 16-May-13 2:52am

What could be the reason for above case?

Am Gayathri 16-May-13 2:52am

Why hitting the function on both time ?(check\uncheck)

RelicV 16-May-13 3:04am

Hmm. looking at your code, only on button click, you are adding the onclick function to the button, but not on the pageload. So, if the checkbox is not checked and the first button click will add the onclick attribute to the button. From now onwards, the JS function will work. Put the onclick attribute in pageload inside if(!IsPostback) and check it.

RelicV 16-May-13 3:11am

<table>
<tr>
<td><asp:CheckBox ID="chbxSelect" runat="server" /></td>
<td><asp:Button ID="btnSelect" runat="server" Text="Confirm"/></td>
</tr>
</table>

<script>
function checkCheckBoxes()
{
if(!document.getElementById('<%=chbxSelect.ClientID').checked)
{
alert ('Please check');
return false;
}
else
return true;
}
</script>

----------------------------------------------------------------

Code behind in .cs file

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
btnSelect.Attributes.Add("OnClick", "javascript:return checkCheckBoxes();");
}
}

protected void buttonOk_Click(object sender, EventArgs e)
{
Response.Redirect(xxxxx, false);
}

Try this one.!

RelicV 16-May-13 7:41am

got it working..?

Code-Hunt · Answer 2 · 2013-05-15T20:25:00

Solution 2

http://stackoverflow.com/questions/4436524/how-to-validate-for-checkbox-selection-if-all-checkbox-have-same-name[^]

http://www.chennaisunday.com/jscheckbox.html[^]

http://jesin.tk/javascript-validation-textbox-combobox-radiobutton-checkbox/[^]

you can try using javascript..check this links..may be u will get help...

Posted 15-May-13 20:25pm

Code-Hunt

Comments

Am Gayathri 16-May-13 2:52am

What could be the reason for above case?