Using jqGrid to read data and display it based on PHP and Mysql_jquery

<div id="opt"> 
 <div id="query"> 
 <label>编号：</label><input type="text" class="input" id="sn" /> 
 <label>名称：</label><input type="text" class="input" id="title" /> 
 <input type="submit" class="btn" id="find_btn" value="查 询" /> 
 </div> 
 <input type="button" class="btn" id="add_btn" value="新 增" /> 
 <input type="button" class="btn" id="del_btn" value="删 除" /> 
</div> 
<table id="list"></table> 
<div id="pager"></div> 

$("#list").jqGrid({ 
 url:'do.php?action=list', //请求数据的url地址 
 datatype: "json", //请求的数据类型 
 colNames:['编号','名称','主屏尺寸','操作系统','电池容量', '价格(￥)','操作'], //数据列名称（数组） 
 colModel:[ //数据列各参数信息设置 
  {name:'sn',index:'sn', editable:true, width:80,align:'center', title:false}, 
  {name:'title',index:'title', width:180, title:false}, 
  {name:'size',index:'size', width:120}, 
 {name:'os',index:'os', width:120}, 
  {name:'charge',index:'charge', width:100,align:'center'}, 
 {name:'price',index:'price', width:80,align:'center'}, 
  {name:'opt',index:'opt', width:80, sortable:false, align:'center'}  
 ], 
 rowNum:10, //每页显示记录数 
 rowList:[10,20,30], //分页选项，可以下拉选择每页显示记录数 
 pager: '#pager', //表格数据关联的分页条，html元素 
 autowidth: true, //自动匹配宽度 
 height:275, //设置高度 
 gridview:true, //加速显示 
 viewrecords: true, //显示总记录数 
 multiselect: true, //可多选，出现多选框 
 multiselectWidth: 25, //设置多选列宽度 
 sortable:true, //可以排序 
 sortname: 'id', //排序字段名 
 sortorder: "desc", //排序方式：倒序，本例中设置默认按id倒序排序 
 loadComplete:function(data){ //完成服务器请求后，回调函数 
 if(data.records==0){ //如果没有记录返回，追加提示信息，删除按钮不可用 
  $("p").appendTo($("#list")).addClass("nodata").html('找不到相关数据！'); 
  $("#del_btn").attr("disabled",true); 
 }else{ //否则，删除提示，删除按钮可用 
  $("p.nodata").remove(); 
  $("#del_btn").removeAttr("disabled"); 
 } 
 } 
}); 

$(function(){ 
 $("#find_btn").click(function(){ 
 var title = escape($("#title").val()); 
 var sn = escape($("#sn").val()); 
 $("#list").jqGrid('setGridParam',{ 
  url:"do.php?action=list", 
  postData:{'title':title,'sn':sn}, //发送数据 
  page:1 
 }).trigger("reloadGrid"); //重新载入 
 }); 
}); 

include_once ("connect.php"); 
$action = $_GET['action']; 
switch ($action) { 
 case 'list' : //列表 
 $page = $_GET['page']; //获取请求的页数 
 $limit = $_GET['rows']; //获取每页显示记录数 
 $sidx = $_GET['sidx']; //获取默认排序字段 
 $sord = $_GET['sord']; //获取排序方式 
 if (!$sidx) 
  $sidx = 1; 
 
 $where = ''; 
 $title = uniDecode($_GET['title'],'utf-8'); //获取查询关键字：名称 
 if(!empty($title)) 
  $where .= " and title like '%".$title."%'"; 
 $sn = uniDecode($_GET['sn'],'utf-8'); //获取查询关键字：编号 
 if(!empty($sn)) 
  $where .= " and sn='$sn'"; 
 //执行SQL 
 $result = mysql_query("SELECT COUNT(*) AS count FROM products where deleted=0".$where); 
 $row = mysql_fetch_array($result, MYSQL_ASSOC); 
 $count = $row['count']; //获取总记录数 
 //根据记录数分页 
 if ($count > 0) { 
  $total_pages = ceil($count / $limit); 
 } else { 
  $total_pages = 0; 
 } 
 if ($page > $total_pages) 
  $page = $total_pages; 
 $start = $limit * $page - $limit; 
 if ($start < 0 ) $start = 0; 
 //执行分页SQL 
 $SQL = "SELECT * FROM products WHERE deleted=0".$where." ORDER BY $sidx $sord 
 LIMIT $start , $limit"; 
 $result = mysql_query($SQL) or die("Couldn t execute query." . mysql_error()); 
 $responce->page = $page; //当前页 
 $responce->total = $total_pages; //总页数 
 $responce->records = $count; //总记录数 
 $i = 0; 
 //循环读取数据 
 while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) { 
  $responce->rows[$i]['id'] = $row[id]; 
  $opt = "<a href='edit.php'>修改</a>"; 
  $responce->rows[$i]['cell'] = array ( 
  $row['sn'], 
  $row['title'], 
  $row['size'], 
  $row['os'], 
  $row['charge'], 
  $row['price'], 
  $opt 
  ); 
  $i++; 
 } 
 echo json_encode($responce); //输出JSON数据 
 break; 
 case '' : 
 echo 'Bad request.'; 
 break; 
} 

/处理接收jqGrid提交查询的中文字符串 
function uniDecode($str, $charcode) { 
 $text = preg_replace_callback("/%u[0-9A-Za-z]{4}/", toUtf8, $str); 
 return mb_convert_encoding($text, $charcode, 'utf-8'); 
} 
function toUtf8($ar) { 
 foreach ($ar as $val) { 
 $val = intval(substr($val, 2), 16); 
 if ($val < 0x7F) { // 0000-007F 
  $c .= chr($val); 
 } 
 elseif ($val < 0x800) { // 0080-0800 
  $c .= chr(0xC0 | ($val / 64)); 
  $c .= chr(0x80 | ($val % 64)); 
 } else { // 0800-FFFF 
  $c .= chr(0xE0 | (($val / 64) / 64)); 
  $c .= chr(0x80 | (($val / 64) % 64)); 
  $c .= chr(0x80 | ($val % 64)); 
 } 
 } 
 return $c; 
}