Smart admin jarvismenu dynamically insert elements and re-init

jarvismenu-insert.js

/*
 * Source plugin: https://gist.github.com/kigamuka/1cd8360ae4a0f13c2b33
 * Issue to solve: Scripting too many left nav multi-level items(over 20000+)  
                   cause bad performance, need load element dynamically                    
 * =======================================================================
 * Example UI:
  <ul>
    <li>
        <a id="target" href="#">parent anchor<b class="collapse-sign"><em class="fa fa-minus-square-o"></em></b></a>
        // INSERT UL HERE...
    </li>
  </ul>
*/
$('nav a').click(function(){  
  var $this = $(this);
  if($this.data('load-element')) 
     return;
  var ul = $('<ul><li><a>new child anchor</a>'); // GET UL BY AJAX HERE...
  ul.insertAfter($this);
// UNBIND
  $this.closest('ul').find('li a').unbind('click');
  $this.closest('ul').find('b').remove();
  // RE-INITIALIZE UL
  $this.closest('ul').jarvismenu({
      accordion : true,
      speed : $.menu_speed,
      closedSign : '<em class="fa fa-plus-square-o"></em>',
      openedSign : '<em class="fa fa-minus-square-o"></em>'
  });
  $this.attr('data-load-element', true);
})