Dynamic Macro parameters

[Sujana B]

I have two questions about macro parameters.

1. I need to implement a page picker(auto-complete page title) specific to a space. I am aware of 'confluence-content' type which auto-completes page titles. But how do I restrict it to a certain space ?
2. Is it possible to validate macro parameters if the input field is a number? . Like show a warning message if input is anything other than numbers. Is it I validate using javascript by using events or on submit?

Thanks in Advance!