can't get autocomplete value

[eluser]titolancreo[/eluser]
I don't know what else I need to do, I only have what you see. I thought that response function was on jquery code, but because of your ansewer, maybe I have to write it...

I know that it uses get, but I want to do it with post, and that's not my problem, because it works (more and less)
if I send "as" for example, I can't get it, but I get first 10 rows from my database instead of the 10 rows that contains "as".
At the endo of controller I send it by echo json_encode and it works, because I can see them with Firebug and also, with alerts, but I don't know why, I can't see this 10 names in the dropdown menu.

So, I want to know why in my controller, at this line <code>$term = $this->input->post('term');</code> I get $term as a boolean with value 0 instead of a string with value "as"