serializing form doesn't update with listener

Hey guys, I'm wondering can someone help me out. I'm using javascript to serialize a search form. It's working.. however, if the user changes the query (backspacing, typing more, etc.) it doesnt update (I'm using a listener) and throws back undefined. How would fix this? http://pastebin.com/edVmQ3si

EDIT: Just to clarify, the listener is working. It's just getting undefined when looking for the values from the code I linked.

Listener just calls the function which executes the code l开发者_如何学Goinked.

Attach it to the keyup event...

var searchInput = $('form[name="gs"]'),
    searchForm = searchInput.closest('form'); // Thanks Matt Ball

var base = searchInput.attr('action');

searchInput.keyup(function() {
    var params = searchForm.serialize();
    var url = base + '?' + params;  
    // Do what you need with url.  
});