title: owl carousel, navigation center
body: <p>I use owl carousel plugin, can't find how to let navigation vertical align center, with option autoHeight. </p>
  
  <p><a href="http://codepen.io/anon/pen/jJAHL" rel="nofollow noreferrer">http://codepen.io/anon/pen/jJAHL</a></p>
  
  <p>I tried like below, but it only get last height.</p>
  
  <pre><code>$(this_gallery).owlCarousel({
    singleItem: true,
    autoHeight : true,
    navigation:true,
    stopOnHover : true,
    afterAction: function() {
      var center_height = $(this_gallery).find('.owl-wrapper-outer').height();
      console.log(center_height);
    }
  });
  </code></pre>