title: jquery datatable sorts columns even when orderable false specified in columndefs
body: <p>Im facing a strange problem with JQUERY Datatable plugin. I've a rating feature being used in every rows. The first cell actually  holds the control for that purpose.</p>
  
  <p>Here is the markup for the first cell</p>
  
  <pre><code>&lt;input class="row-check" type="checkbox"&gt;&lt;span class="fa-stack fa-lg star-rating"&gt;
  &lt;i class="fa fa-star goldstar  fa-stack-2x"&gt;&lt;/i&gt;
  &lt;strong class="fa-stack-1x inside-text"&gt;4&lt;/strong&gt; &lt;/span&gt;
  </code></pre>
  
  <p>Here is the Datatable initialization code Im using</p>
  
  <pre><code>    var myTable = $("#tbl_main").dataTable({
      "dom": "&lt;'tableinfobar'i&gt;&lt;'tablesearchbox'f&gt;&lt;'tablestarfilter'&gt;&lt;'tablestarreset'&gt;&lt;'tablebody't&gt;S&lt;'tablelength'l&gt;&lt;'tablepaging'p&gt;",
      "ordering": true,
      "columnDefs": [{ "targets": [0, 6], "searchable": false, "orderable": false }, 
  { "targets": [ 1, 3, 4, 5,  7, 8, 9], "orderable": false }, 
  { "targets": [2], "type": "html-num", "orderable": true}],
      "lengthMenu": [
          [10, 20, 50, 100, 500, -1],
          [10, 20, 50, 100, 500, "All"]
      ],
      "language": {
          "search": "Quick Search _INPUT_",
          "zeroRecords": "No assessments found with that search criteria.",
          "info": "Showing _START_ to _END_ of _TOTAL_ Assessments",
          "infoFiltered": " - filtered from _MAX_ entries",
          "lengthMenu": "Show _MENU_ Entries"
      }
  }).show();
  </code></pre>
  
  <p>As you can see in the code, I disabled sorting for the first column in the columndefs. But still if some values inside the first cells <strong>Strong tags</strong> <strong>(In this case <code>&lt;strong class="fa-stack-1x inside-text"&gt;4&lt;/strong&gt;</code>)</strong> the whole table being sort descending based on that value. Means if any other rows having no rating values inside that <strong>strong tags</strong> in the first cell, the row with some values shows as the final row in the whole table.</p>
  
  <p>What I did wrong here.</p>