How can we implement a Custom Validator to be triggered at the time of Submitting a form?
My situation is like, in some situation a control can be left as blank but in some situation there should be a value. So I tried by placing a Custom Validator to the UI. But it didn't worked; as the page is unable to recognize the custom-validator tag. is id already deprecated? or am i missing something?
My idea is to show the validator message while submitting a page by checking some condition in script code.