title: Get DataKey property from Tabulator Object
body: <p>I have a Problem with Tabulator in common with jspdf.
  I created a Tabulator  table with about 20 columns like this...</p>
  <pre class="lang-js prettyprint-override"><code>const tblErgebnis = new Tabulator('#tblErgebnis', {
      history: true,
      data: tblData,
      movableColumns: true,
      layout: 'fitColumns',
      resizableColumns: true,
      responsiveLayout: 'hide',
      layoutColumnsOnNewData: true,
      columns: [
        {
          title: 'Region',
          field: 'R',
          align: 'center',
          sorter: 'string',
          visible: false,
          headerDblClick: function(e, column) {
            tblErgebnis.toggleColumn('R');
          },
        }
      ]
  });
  </code></pre>
  <p>This table is displayed on a website and now I am trying to get this table printed on a PDF.</p>
  <p>This works so far but my problem is the cellwidth in the printed PDF. I read about the dataKey possibility and set the columnstyles for the specific column. But now I don't know ho to get the dataKey in the Tabulator Object to reach it from jspdf function. The need of this is because not every column can be select oder deselect and the sequence of the columns ca be changed.</p>