<script>
	$(document).ready(function () {
		$("#list_records").jqGrid({ //подключение модуля jqgrid
			url: "getGridData.php",
			datatype: "json",
			mtype: "GET",
			colNames: ["Код пользователя", "Фамилия", "Имя", "Отчество"],
			colModel: [
				{ name: "userId",align:"right",editable:false},
				{ name: "userName",editable:true,edittype:"text"},
				{ name: "firstName",editable:true,edittype:"text"},
				{ name: "lastName",editable:true,edittype:"text"}
			],
			pager: "#perpage",
			rowNum: 10,
			rowList: [10,20],
			sortname: "userId",
			sortorder: "asc",
			height: 'auto',
			viewrecords: true,
			gridview: true,
			caption: "Таблица пользователей",
            
		}); 
    jQuery("#list_records").jqGrid('navGrid','#perpage',{ edit: true, add: true, del: true, search: true, refresh: true, view: true});// подключение панели навигации
       

    /*     {} ???? как правильно вызвать к примеру скрипт обновления выбранной строки updateDataGrid.php  */
   
	});
    
	</script>

<?php
error_reporting(E_ALL ^ E_DEPRECATED);
// connect to the database
//This contains the unique record to update 
$id = $_GET['id'];
//$userId = $_GET['userId']; 
$userName = $_GET['userName'];
$firstName = $_GET['firstName'];
$lastName = $_GET['lastName'];
$conn = mysql_connect("localhost", "user1", "12345") or die("Connection Error: " . mysql_error());
mysql_select_db("db_trade") or die("Error conecting to db.");

//This contains the data that will update the db
mysql_query("UPDATE tbl_users SET userName='$userName',firstName='$firstName',lastName='$lastName' WHERE userId=$id") or die(mysql_error());

?>