Force grid to reload the after update
Use event "jqGridAddEditAfterSubmit" to trigger grid reload after every submit.
// trigger the grid to reload after submit
$afterSubmit = <<<AFTERSUBMIT
function (event, status, postData)
{
var grid = jQuery("#TABLE_NAME");
grid.trigger("reloadGrid");
}
AFTERSUBMIT;
$dg->add_event("jqGridAddEditAfterSubmit", $afterSubmit);