Ajax Proxy and Extra Parameters - Collecting User Input

[brian.scott@talgov.com]

Hello friends -

Let's say I would like to collect a value that a user enters into a text box, and send that value as an extra parameter at json call time?

i.e., this code inside my extraParams component works fine:

{"userName": 'scottb'}

But I really need to put:

{"userName": #whateverTheUserTyped#}

Can someone give me a little guidance on how to get there?

Thanks!