title: jqgrid, how to pass data when adding row using add navigator button
body: <p>How to pass additional POST key to add controller if row is added using Add navigator button?</p>
  
  <p>I tried code below to pass _dokdata with form values but _dokdata is not passed to controller in 
  server.</p>
  
  <pre class="lang-js prettyprint-override"><code>$("#grid").jqGrid('inlineNav', '#grid_toppager', {
     addParams: {
      useDefValues : true,
      useFormatter : false,
      addRowParams : {
          extraparam : { _dokdata : FormData },
         editData: { _dokdata: FormData },
         },
      editData: { _dokdata: FormData },
      extraparam : { _dokdata : FormData },
     },
  
     add: true,
     edit: false,
     save: true,
     cancel: true,
     editParams : {}
     }); 
  
  function FormData() {
      return JSON.stringify($("#_form").serializeArray());
  }
  </code></pre>