ASP CustomValidator, advancing to postback after error

Question

I have an ASP .NET page with ASP validators (Required Field, Regular Expression,...) plus java script functions for additional validation (for example, to check if second date b

Answer 1

When using a CustomValidator, the client side validation function needs to accept a source and an arguments parameter. Then, to mark the validation as failed, you set arguments.IsValid to false. Here is the MSDN page for the CustomValidator.

function validate(source, arguments) {
   // ...

   alert('Not valid!');
   arguments.IsValid=false;
}