title: How to get the node attributes in jstree JSON data
body: <p>I want to get the attributes of each node in my tree. After looking online, I found a way to do it but it doesn't work. The error is (at the line of attr("description") :</p>
  
  <pre><code>Uncaught TypeError: Cannot read property 'obj' of undefined
  </code></pre>
  
  <p>Here is my code:</p>
  
  <pre><code>jQuery(document).ready(function() {
      var $ = jQuery;
      $('#jstree').jstree({ 'core' : {
      'data' : [
         {"id":"parent","parent":"#","text":"parent"},
         {"id":"cs","text":"Short Stay","parent":"parent","li_attr":{"label":"Short Stay","description":"example"}},
         {"id":"ls","text":"ls","parent":"parent"},{"id":"cs_1","text":"cs_1","parent":"cs"},
         {"id":"ls_1","text":"ls_1","parent":"ls"},{"id":"cs_1_1","text":"cs_1_1","parent":"cs_1"},
         {"id":"cs_1_1_1","text":"cs_1_1_1","parent":"cs_1_1"},
         {"id":"cs_1_1_2","text":"cs_1_1_2","parent":"cs_1_1"}
      ]
  } })
  .on("select_node.jstree",
       function(evt, data){
            $('#data').html(data.rslt.obj.attr("description"));
       }
  );
    });
  </code></pre>