title: Pre-select filters in jqgrid (multi-select)
body: <p>Taking this example (<a href="http://www.ok-soft-gmbh.com/jqGrid/SimpleLocalGridWithSearchingToolbarMultilpe.htm" rel="nofollow noreferrer">http://www.ok-soft-gmbh.com/jqGrid/SimpleLocalGridWithSearchingToolbarMultilpe.htm</a>) from this question (<a href="https://stackoverflow.com/questions/12869819/excel-like-filtering-in-jqgrid">Excel like filtering in jqgrid</a>)</p>
  
  <p>Is there a way to set the filter parameters from the start? For example, in the 'Shipped via' column, I would want 'TNT' and 'Intim' to be checked, leaving 'FedEx' unchecked. </p>
  
  <p>One solution I thought was viable is to ship_via</p>
  
  <pre><code>if(id == 'gs_ship_via'){ 
                          _.forEach($options, function(option){
                              if(option.value != 'FexEx'){
                                  option.selected = true; 
                              } else {
                                  option.selected = false;    
                              }
                          });
                      }
  </code></pre>
  
  <p>The problem I run into after that is that it doesn't update the data in the grid. So, I need a different way to set the check box after it's loaded in a way that will update the grid.</p>