title: Need to pass a jqgrid column name to function triggered by the "onclickSubmit" event
body: <p>I need to pass or make available a jqgrid colModel column name to a function triggered by the jqgrid event <strong>"onclickSubmit:"</strong> defined in the edit options of navGrid - but i don't know how to do that.</p>
  
  <p>here are the jqgrid and javascript code segments:</p>
  
  <pre><code>..., onclickSubmit: fixpostdata}, // navGrid edit options
  .
  .
  . 
  var fixpostdata = function(params, postdata){
      var rowid = $('#tab3-grid').getGridParam('selrow');
  
      // when the onclickSubmit event fires and calls this function,
      // a string containing a jqgrid colmodel column name needs to be
      // made available in order to modify that cell's value contained
      // in the postdata array prior to posting it to the server.
  
      columnName =  ???;
  
      var value = $('#tab3-grid').jqGrid('getCell', rowid, columnName );
  
      postdata[ columnName ] = value;
  
      return;
  }
  </code></pre>
  
  <p>Can anyone help?
  also,
  what's contained in the params argument?</p>