Optional validation in ASP.NET

Question

I have a page with three radio buttons, depending on which button is selected I need to validate some controls (using required field validators). Other than using custom validators, is there any way to do this?

Thanks

Answer 1

Add an OnSelectedIndexChanged to the RadioButtonList (or CheckedChanged if they're individual Radio button controls)

In the code behind, .Enable & .Disable the specific required field validators.

Answer 2

ASP.NET Validators offer a client-side API that allows you to :

• validate client side
• Hook up validators client side.
• Enable or disable client side validators.

The syntax of the ValidatorEnable function is :

 ValidatorEnable(rfvMyValidator, boolState);

Answer 3

I tried this on a small example and it worked for me:

I have

-2textboxes: TextBox1 and TextBox2

-RequiredFieldValidator : RequiredFieldValidator1 with ControlToValidate="TextBox1"

-RadioButton : RequiredFieldValidator1

This code is generated by the RequiredFiledValidator:

<script type="text/javascript">
//<![CDATA[
var RequiredFieldValidator1 = document.all ? document.all["RequiredFieldValidator1"] : document.getElementById("RequiredFieldValidator1");
RequiredFieldValidator1.controltovalidate = "TextBox1";
RequiredFieldValidator1.errormessage = "RequiredFieldValidator";
RequiredFieldValidator1.evaluationfunction = "RequiredFieldValidatorEvaluateIsValid";
RequiredFieldValidator1.initialvalue = "";
//]]>
</script>

I want when the user click on the RadioButton1 to switch the validation to TextBox2.

This is how I did it:

 protected void Page_Load(object sender, EventArgs e)
        {
            RadioButton1.Attributes.Add("onclick", "RequiredFieldValidator1.controltovalidate=\"TextBox2\"");
        }