observeField equivalent in the new JsHelper

I have a depdent drop down.

when someone picks a country the regions from the country populate. It
works in 1.2, but when i migrated to 1.3 i had to change a few things
around because the ajax, observeField and javascript helper has been
deprecated

I cant figure the observeField equivalent to this

<?php echo $ajax-
>observeField('countries',array('url'=>'update_region_select','update'=>'regions'));?
>

I tried this

<?php
$this->Js->get('#country_id')->event('change', $this->Js->request(
array('controller' => 'countries', 'action' =>
'update_region_select'),
array(
'update' => '#region_id',
'async' => true,
'dataExpression' => true,
'method' => 'post',
'data' => $js->serializeForm(array('isForm' => false, 'inline' =>
true))
) ) );

?>

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