title: How to set search filters in jqgrid everytime i open search dialog
body: <p>I am using jqgrid advanced search in my project. Everything works fine. Now I have to display a default search condition on click of search button. Please tell me how can I achieve this. I have tried the below code in beforeShowSearch</p>
  
  <pre><code>var postdata = 
                  {
                      filters: '{"groupOp":"AND","rules":[' +
                              '{"field":"invdate","op":"gt","data":"2007-09-06"}]}'
                  };
                  grid.jqGrid('setGridParam', { search: true, postData: postdata });
  </code></pre>
  
  <p>It dint work.</p>