jQuery treetable with event trigger

with jQuery treetable plugin, trigger a function with event onNodeCollapse http://ludo.cubicphuse.nl/jquery-treetable/

HTML

<script src="http://ludo.cubicphuse.nl/jquery-treetable/jquery.treetable.js"></script>
<link rel="stylesheet" href="http://ludo.cubicphuse.nl/jquery-treetable/css/screen.css">
<link rel="stylesheet" href="http://ludo.cubicphuse.nl/jquery-treetable/css/jquery.treetable.css">
<link rel="stylesheet" href="http://ludo.cubicphuse.nl/jquery-treetable/css/jquery.treetable.theme.default.css">
<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.11.0/jquery-ui.min.js"></script>
<link rel="stylesheet" href="//ajax.googleapis.com/ajax/libs/jqueryui/1.11.0/themes/smoothness/jquery-ui.css">
      <table id="example-basic">
        <caption>
          <a href="#" onclick="jQuery('#example-basic').treetable('expandAll');  return false;">Expand all</a>
          <a href="#" onclick="jQuery('#example-basic').treetable('collapseAll'); return false;">Collapse all</a>
        </caption>
        <thead>
          <tr>
            <th>Tree column</th>
            <th>Additional data</th>
          </tr>
        </thead>
        <tbody>
          <tr data-tt-id="1">
            <td>Node 1: Click on the icon in front of me to expand this branch.</td>
            <td>I live in the second column.</td>
          </tr>
          <tr data-tt-id="1.1" data-tt-parent-id="1">
            <td>Node 1.1: Look, I am a table row <em>and</em> I am part of a tree!</td>
            <td>Interesting.</td>
          </tr>
          <tr data-tt-id="1.1.1" data-tt-parent-id="1.1">
            <td>Node 1.1.1: I am part of the tree too!</td>
            <td>That's it!</td>
          </tr>
          <tr data-tt-id="2">
            <td>Node 2: I am another root node, but without children</td>
            <td>Hurray!</td>
          </tr>
        </tbody>
      </table>

JavaScript

function getDocHeight() {
    
    var doc = doc || document;
    // stackoverflow.com/questions/1145850/
    var body = doc.body, html = doc.documentElement;
    var height = Math.max( body.scrollHeight, body.offsetHeight, 
        html.clientHeight, html.scrollHeight, html.offsetHeight );

    
    alert(height);
}

$("#example-basic").treetable({ 
    expandable: true,
    onNodeCollapse: function() {
        alert(this.getAttribute('data-tt-id'));
    },
    onNodeExpand: function() {
        alert(this.getAttribute('data-tt-id'));
    }
});