title: getting the sum using footerdata on jqgrid
body: <p>I have a column name Total. <br/>
  And I'm also using the footer <br/>
  value of the jqgrid. <br/></p>
  
  <p>Example this is the column <br/></p>
  
  <p>Total <br/>
  100 <br/>
  -98<br/>
  -76<br/>
  98<br/>
  76<br/></p>
  
  <p>how can I get the sum of the row <br/>
  using the footer data.</p>
  
  <p>here is my code. <br/>
  note: if i use 'sum' it gives me 'NaN' <br/>
  value. <br/></p>
  
  <pre><code>var parseTotal= grid.jqGrid('getCol', 'Total', false, 'sum');
  grid.jqGrid('footerData', 'set', { Total: parseTotal});
  </code></pre>