title: jqgrid excelExport how usage exportOptions?
body: <p>The documentation says:</p>
  
  <pre><code>jQuery("#grid").jqGrid('excelExport', { url: 'ExportExcel.php' });
  </code></pre>
  
  <p>Where can I find <code>exportOptions</code> describe and usage like</p>
  
  <pre><code>jQuery("#grid").jqGrid('excelExport', { url: 'ExportExcel.php' ; 
      exportOptions: { array...} });
  </code></pre>
  
  <p>or view sample of the usage of this <code>exportOptions</code>?</p>