In some cases we need a smaller data between server and client. This example tell us how we
can do that. The data is JSON and is in format:
{ total: xxx, page: yyy, records: zzz, rows: [
{”Row01″,”Row 01″,”Row 02″,”Row 03″,”Row 04″},
{”Row11″,”Row 12″,”Row 12″,”Row 13″,”Row 14″},
...
HTML
<![CDATA[
...
<table id="jsonopt" class="scroll" cellpadding="0" cellspacing="0"></table>
<div id="pjopt" class="scroll" style="text-align:center;"></div>
<script src="jsonopt.js" type="text/javascript"> </script>
]]>
Java Scrpt code
<![CDATA[
...
jQuery("#jsonopt").jqGrid({
url:'server.php?q=5',
datatype: "json",
colNames:['Inv No','Date', 'Client', 'Amount','Tax','Total','Notes'],
colModel:[
{name:'id',index:'id', width:55},
{name:'invdate',index:'invdate', width:90},
{name:'name',index:'name asc, invdate', width:100},
{name:'amount',index:'amount', width:80, align:"right"},
{name:'tax',index:'tax', width:80, align:"right"},
{name:'total',index:'total', width:80,align:"right"},
{name:'note',index:'note', width:150, sortable:false}
],
rowNum:10,
rowList:[10,20,30],
imgpath: gridimgpath,
pager: jQuery('#pjopt'),
sortname: 'id',
viewrecords: true,
sortorder: "desc",
jsonReader: {
repeatitems : true,
cell:"",
id: "0"
},
caption: "Data Optimization",
height: 210
}).navGrid('#pjopt',{edit:false,add:false,del:false});
]]>
PHP with MySQL
<![CDATA[
...
$page = $_GET['page']; // get the requested page
$limit = $_GET['rows']; // get how many rows we want to have into the grid
$sidx = $_GET['sidx']; // get index row - i.e. user click to sort
$sord = $_GET['sord']; // get the direction
if(!$sidx) $sidx =1;
// connect to the database
$db = mysql_connect($dbhost, $dbuser, $dbpassword)
or die("Connection Error: " . mysql_error());
mysql_select_db($database) or die("Error conecting to db.");
$result = mysql_query("SELECT COUNT(*) AS count FROM invheader a, clients b WHERE a.client_id=b.client_id");
$row = mysql_fetch_array($result,MYSQL_ASSOC);
$count = $row['count'];
if( $count >0 ) {
$total_pages = ceil($count/$limit);
} else {
$total_pages = 0;
}
if ($page > $total_pages) $page=$total_pages;
$start = $limit*$page - $limit; // do not put $limit*($page - 1)
if ($start<0) $start = 0;
$SQL = "SELECT a.id, a.invdate, b.name, a.amount,a.tax,a.total,a.note FROM invheader a, clients b WHERE a.client_id=b.client_id ORDER BY $sidx $sord LIMIT $start , $limit";
$result = mysql_query( $SQL ) or die("Couldnt execute query.".mysql_error());
$responce->page = $page;
$responce->total = $total_pages;
$responce->records = $count;
$i=0;
while($row = mysql_fetch_array($result,MYSQL_ASSOC)) {
$responce->rows[$i]=$responce->rows[$i]['cell']=array($row[id],$row[invdate],$row[name],$row[amount],$row[tax],$row[total],$row[note]);
$i++;
}
echo $json->encode($responce); // coment if php 5
//echo json_encode($responce);
...
]]>