This is the C# code for an ASP.NET required validator web control that requires a specified set of controls to be all populated, or all empty. It inherits from the RequiredFieldValidator ASP.NET class, so it essentially works the same way, it just treats the set of controls you specify as if they were one control (in the sense of requirement).

Here is a free JavaScript trim() function for your use. Trim is a common function in other languages' syntax that removes leading and trailing spaces in a string. It does not exist in JavaScript as a built-in String function.