title: jquery get checked checkboxes
body: <p>i'm trying to get the list of checkboxes and the count that are checked. I have this:</p>
  
  <pre><code>        var obj = $(this).closest('li').find(':checkbox');
  
          var childCount=$(obj).size();
          var checkedCount=$(obj).(':checked').length;
  </code></pre>
  
  <p>I get error on checkedCount</p>
  
  <p>??</p>