title: getting specific data of selected row from Datatable
body: <p>I'm desperately trying to get specific information from the selected rows using datatable jquery.
  I want to get the data-ID attribute of the second column, but I only have access to the content of the cell.</p>
  <pre><code>var rows = table.rows({selected: true} ).data().toArray();
          for (let i in rows) {
              console.log(JSON.stringify( rows[i][1] )); //shows Jason
          }
  </code></pre>
  <br>
  <pre><code>&lt;tr&gt;
  &lt;th&gt;Customer name&lt;/th&gt;
  &lt;th&gt;City&lt;/th&gt;
  &lt;th&gt;Amount&lt;/th&gt;
  &lt;/tr&gt;
  </code></pre>
  <br>
  <pre><code>&lt;tr id=&quot;1234&quot;&gt;
  &lt;td data-id=&quot;553&quot;&gt;Jason&lt;/td&gt;
  &lt;td&gt;Paris&lt;/td&gt;
  &lt;td&gt;$140&lt;/td&gt;
  &lt;/tr&gt;
  </code></pre>
  <p>A solution?</p>