Question

I have a huge form with many RequiredFieldValidators, how can I programmatically determine which control is setting the IsValid property of the Page to false?

Answer 1

On the server side, you can look at the Validators property to find all the IValidator instances. Then, you just test which one(s) are not .IsValid.

var notValidValidators = Page.Validators.Cast<IValidator>().Where(v => !v.IsValid);

On the client side, it’s similar. There’s a JavaScript array Page_Validators, and each one has a isvalid property.

var notValidValidators = Page_Validators.filter(function(v) { return !v.isvalid; });