Question

Can you have custom client-side javascript Validation for standard ASP.NET Web Form Validators?

For instance use a asp:RequiredFieldValidator leave the server side code alone but implement your own client notification using jQuery to highlight the field or background color for example.

Answer 1

The standard CustomValidator has a ClientValidationFunction property for that:

<asp:CustomValidator ControlToValidate='Text1'                       ClientValidationFunction='onValidate' />  <script type='text/javascript'> function onValidate(validatorSpan, eventArgs)  { eventArgs.IsValid = (eventArgs.Value.length > 0);    if (!eventArgs.IsValid) highlight(validatorSpan);  } </script>