FAQ - Frequently Asked Questions

Re: Checkbox Validation - Best Solution

Ankit Jain — Sun, 06 Sep 2009 10:15:33 GMT

or directly we can search for htmltablecontrols and give the id of the checkbox that needs to be checked

Re: server control and custom control differences

praveen.singh — Thu, 11 Jun 2009 20:13:56 GMT

You can create your own control that is custom control,you can find that custom control in the form of dll like Ajax control tool kit,

server control provided by default asp.net library you can normaly find in asp.net tool box

Thanks

server control and custom control differences

sunrobin23 — Thu, 11 Jun 2009 13:13:08 GMT

what is server control and custom control diff.?

Re: Checkbox Validation - Best Solution

shahed.kazi — Sat, 30 May 2009 05:51:49 GMT

You can use a compare validator for the checkbox checking the values of the checkbox.

Re: Checkbox Validation - Best Solution

Spider Master — Fri, 29 May 2009 03:55:42 GMT

I have created my own Checkbox and checkboxlist validator if your interested.

It works just the same as all <asp:Validators and works with the validation summary also.

You just add the dll to your toolbox and drop it on the page, set the properties and go nuts

Re: Checkbox Validation - Best Solution

nalinbc — Tue, 05 May 2009 11:28:42 GMT

Here's a solution that I used in a recent website:

Since the asp:CustomValidator does not accept an asp:CheckBox as the control to validate, the first step is to set it to any other control in the page (e.g. a textbox).

The second step is to write a bit of JavaScript (JQuery) to return the non-checked state of the checkbox to validate. Below, I am showing a JavaScript variable being set, that is for use by the JavaScript method.

var controlID1 = '<%= CheckBoxAgree.ClientID %>';

</script>

Here's the JavaScript function you'll need to write:

function IsNotChecked1(obj, args) {

var checkbox = $("#" + controlID1); args.IsValid = checkbox.attr('checked');

}

Here's the code to include in the aspx page:

<asp:CheckBox ID="CheckBoxAgree" runat="server"

Text="I confirm that the above information is accurate to the best of my knowledge and agree to the terms and conditions" />

<asp:CustomValidator ID="CustomValidatorAgree" runat="server" ClientValidationFunction='IsNotChecked1'

onservervalidate="CustomValidatorAgree_ServerValidate" ValidationGroup="group1" ControlToValidate="TextBoxTelephone"

ErrorMessage="'I confirm' must be checked" ValidateEmptyText="True" ></asp:CustomValidator>

Note that above we are setting the control to validate to any other control in the page.

Since you must also validate on the server side (best practice), here's the C# code:

protected void CustomValidatorAgree_ServerValidate(object source, ServerValidateEventArgs args)

{

args.IsValid = (CheckBoxAgree.Checked);

}

Best regards,

- Nalin Jayasuriya

Re: Checkbox Validation - Best Solution

ajith P T — Tue, 05 May 2009 07:12:05 GMT

You can use Customevalidator for validating the checkbox

Re: Checkbox Validation - Best Solution

sunilyadav165 — Thu, 12 Mar 2009 07:24:42 GMT

Hi,
Here is the code using javascript....

<html>
<head>
<title> Checkbox validations</title>

<SCRIPT TYPE="text/javascript">

function CheckBoxesValidations() {
   if (document.form1.CHKBOX1.checked == false &&
        document.form1.CHKBOX2.checked == false &&
        document.form1.CHKBOX3.checked == false)
       {
       alert (' you have not choose any of the checkboxes!');
       return false;
       }
   else
       {
       return true;
       }
   }

</SCRIPT>

</head>
<body>
<form onsubmit="return CheckBoxesValidations() ;" name="form1" action="">
<input type="checkbox" name="CHKBOX1" value="1">1</p>
<input type="checkbox" name="CHKBOX2" value="2">2</p>
<input type="checkbox" name="CHKBOX3" value="3">3</p>
<input type="submit" value="Submit!" />
</form>
</body>
</html>

If you like my post mark it as ANSWER.

Regards,
sunil

Re: Checkbox Validation - Best Solution

Scott Mitchell — Wed, 20 Dec 2006 16:09:52 GMT

DannyDep:
I've spent a couple of hours searching for a solution to validating a checkbox, since the RequiredFieldValidator does not work with Checkboxes.

Here is a great solution.

Look for "skmValidators - custom validation controls for CheckBoxes and CheckBoxLists for ASP.NET 2.0."

http://scottonwriting.net/sowBlog/CodeProjects.htm

Thanks Scott.

You're welcome, DannyDep. Let me also point you (and others) to an accompanying article, which dissects and discusses the custom, compiled server control (skmValidators):

Creating Validator Controls for the CheckBox and CheckBoxList

Re: Checkbox Validation - Best Solution

moredotnet — Mon, 18 Dec 2006 07:01:44 GMT

If your just validating that checkbox is checked use this javascript snippet

document.getElementById("cb").checked == true

If you want to check & uncheck all checkboxes at one go...use this

Cheers

moredotnet

http://moredotnet.googlepages.com

Re: Checkbox Validation - Best Solution

albertpascual — Sat, 16 Dec 2006 16:52:43 GMT

Actually I like to use AJAX for Checkbox validation, if you add the checkboxes inside an UpdatePanel and then on the server side you can check if they are check or not and update a red label by the checkbox. To the user, looks like works the same way the validation, for you, is just a little bit more magic to write.

Checkbox Validation - Best Solution

DannyDep — Wed, 13 Dec 2006 20:07:24 GMT

I've spent a couple of hours searching for a solution to validating a checkbox, since the RequiredFieldValidator does not work with Checkboxes.

Here is a great solution.

Look for "skmValidators - custom validation controls for CheckBoxes and CheckBoxLists for ASP.NET 2.0."

http://scottonwriting.net/sowBlog/CodeProjects.htm

Thanks Scott.