title: Get value of selectbox with JsHelper in CakePHP
body: <p>I have a select box, and I want to use it to Ajax-update some other content on the page. So I have bound an event handler using the JsHelper (jQuery) like so:</p>
  
  <pre><code>&lt;?php
  echo $this-&gt;Form-&gt;select('car', $cars);
  $this-&gt;Js-&gt;get("#car");
  $this-&gt;Js-&gt;event('change', $this-&gt;Js-&gt;request(array(
      'controller'  =&gt; 'cars',
      'action'      =&gt; 'view', 
      ???,
      array('async' =&gt; true, 'update' =&gt; '#car-view', 'evalScripts'  =&gt; true),
      true
  ));
  ?&gt;
  </code></pre>
  
  <p>But how can I get the value of the select box to send as an argument to the cars controller (at "???" in the code above)?</p>
  
  <p>I could do everything in javascript, but is there any way to do this in cake?</p>