Does this jQuery code create a circular reference?
<p>I'm relatively new to jQuery and am trying to teach myself as I go.</p>

<p>Although not particularly important in the code below, throughout my application there are many parts where a huge number of events will be firing at any one time, therefore I am concerned about circular references and potential memory leaks while still gaining the maximum performance benefit of caching objects in variables.</p>

<p>However I don't quite seem to understand what causes circular references and I certainly don't know how to adjust my code to prevent them.</p>

<p>Does the code below cause a circular reference? If so how can it be avoided?</p>

<pre><code>$('body').on('click', '#timestamped-comment-template', function(e){

    var $target = $(e.target),
        $this = $(this),
        songid = $this.data('songid'),
        array = [];

    if ($target.is('input.reply')) {

        var data = {
           'user-url'  :   $('#BP_loggedin_user_helper').text(),
            'avatar'    :   $('#LoginWithAjax_Avatar').find('img').attr('src'),
            'timestamp' :   $this.find('.time').find('h6').text(),
            'replyto'   :   $this.find('li').last().find('strong').find('a').find('h6').text()
        };

        array.push(data);   

        $this
            .addClass('commenting')
            .find('input')
                .hide()
            .end()
            .find('.replies')
                .after($.render(array, 'replyFormTemplate'))
            .end()  
            .on('click', '.cancel', function(){             
                $this
                    .removeClass('commenting')
                    .find('input')
                        .show()
                    .end()
                    .find('.timed-comment-form')
                        .remove()
                    .end()
                    .off('click', '.cancel');               
                adjustTemplateHeight(songid);               
            });         
        adjustTemplateHeight(songid);
    }   
});

// get template position

function adjustTemplateHeight(songid){

    var $self = $('#timestamped-comment-template'),
        barheight = Number($('#comment-bar-' + songid).offset().top),                               
        contentheight = Number($self.find('.content').actual('height')),
        newheight = barheight - contentheight;

        $self.css({top: (newheight-15) + 'px'})
             .find('.arrow')
                .css({top: contentheight + 'px'});  
}
</code></pre>

<p>The part that concerns me is the nested anonymous function as it is my understanding that this is where they tend to occur most frequently:</p>

<pre><code>.on('click', '.cancel', function(){             
           $this.removeClass('commenting')
                .find('input').show().end()
                     .find('.timed-comment-form')
                          .remove()
                              .end()
                                 .off('click', '.cancel');               
                                        adjustTemplateHeight(songid);               
      });         
</code></pre>
