Mootools Elements in Moo 1.1 vs. 1.2

I've got a script using mootools 1.1开发者_StackOverflow中文版 to handle an Ajax "form" that has does something like this to get an idea of how many rows are in the (dynamically created) form before actually handling them:

form_rows = $$('#form_row'); // X can be anywhere from 4-20
console.log(form_rows.length); // in moo 1.1 this returns X-- with moo 1.2 it returns 1

Reading the moo 1.2 docs, it looks like this should work the same in either case-- but moo 1.2 always returns only the first "form_rows" element, not all of them.

Can anyone explain why?

Thanks for any help.

#form_row implies an ID. There can only be one unique ID per page. Assign and select classes if you need multiple els.