Displaying more than 1450 markers in Google Maps infowindows - google-maps

Question

I have already make some GIS web using googlemaps. but I have some trouble. I have to displayed about 1500 - 2500 marker and have infowindows onclick. 2 days before, everything fine, but when i add more and much detail in infowindows (before only have 4 detail info like name, address, etc and now there is 9 detail info), the marker did not appear. I am using Json message function to get value from database and displayed in infowindows. if it's 1450 markers, it's work fine, but when markers more than that, the markers did not displayed on map. does it memory cache or cookies problem ?? Please help. Thanks. I am using googlechrome, Postgre database, PHP and googlemaps api v3.
<?php
require ('config.php');
$rayon = $_POST['rayon'];
$cabang = $_POST['org_id'];
//echo "$rayon, $cabang, $rayonhasil";
$sql = "SELECT distinct org_id, cp_customer_site_use_id, customer_name, address, postal_code, city, cp_rayon_name, icon_rayon, attribute16, attribute17 FROM hasilgis";
$data = pg_query($sql);
$json = '{"enseval": {';
$json .= '"customer":[ ';
while($x = pg_fetch_array($data)){
$json .= '{';
$json .= '"id_customer":"'.$x['org_id'].'",
"id_photo":"'.$x['cp_customer_site_use_id'].'",
"postal_code":"'.$x['postal_code'].'",
"nama_customer":"'.htmlspecialchars($x['customer_name']).'",
"city":"'.htmlspecialchars($x['city']).'",
"address":"'.htmlspecialchars($x['address']).'",
"nama_rayon":"'.htmlspecialchars($x['cp_rayon_name']).'",
"icon":"'.$x['icon_rayon'].'",
"x":"'.$x['attribute16'].'",
"y":"'.$x['attribute17'].'"
},';
}
$json = substr($json,0,strlen($json)-1);
$json .= ']';
$json .= '}}';
echo $json;
?>
<script type="text/javascript">
function initialize(){
var peta;
var x = new Array();
var y = new Array();
var customer_name = new Array();
var cp_rayon_name = new Array();
var icon = new Array();
var photo = new Array();
var city = new Array();
var address = new Array();
var postal_code = new Array();
// posisi default peta saat diload
var lokasibaru = new google.maps.LatLng( -1.2653859,116.83119999999997);
var petaoption = {
zoom: 5,
center: lokasibaru,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
peta = new google.maps.Map(document.getElementById("map_canvas"),petaoption);
var infowindow = new google.maps.InfoWindow({
content: ''
});
// memanggil function untuk menampilkan koordinat
url = "json.php";
$.ajax({
url: url,
dataType: 'json',
cache: false,
success: function(msg){
for(i=0;i<msg.enseval.customer.length;i++){
x[i] = msg.enseval.customer[i].x;
y[i] = msg.enseval.customer[i].y;
customer_name[i] = msg.enseval.customer[i].nama_customer;
cp_rayon_name[i] = msg.enseval.customer[i].nama_rayon;
icon[i] = msg.enseval.customer[i].icon;
photo[i] = msg.enseval.customer[i].id_photo;
city[i] = msg.enseval.customer[i].city;
address[i] = msg.enseval.customer[i].address;
postal_code[i] = msg.enseval.customer[i].postal_code;
var point = new google.maps.LatLng(parseFloat(msg.enseval.customer[i].x),parseFloat(msg.enseval.customer[i].y));
var gambar_tanda = 'assets/images/'+msg.enseval.customer[i].icon+'.png';
var photo_cust = '<img src="assets/images/foto_cust/'+msg.enseval.customer[i].id_photo+'_1.jpg" style="width:200px;height:120px;"/>';
//var nm_cust = msg.enseval.customer[i].nama_customer;
//var nm_rayon = , msg.enseval.customer[i].nama_rayon;
var html = '<b>' + customer_name[i] + '</b><br/>'+city[i]+ ', '+address[i]+', '+postal_code[i]+'<br/>' + cp_rayon_name[i] + '<br/>' + photo_cust;
tanda = new google.maps.Marker({
position: point,
map: peta,
icon: gambar_tanda,
clickable: true
});
bindInfoWindow(tanda, peta, infowindow, html );
}
}
});
}
google.maps.event.addDomListener(window, 'load', initialize);
function bindInfoWindow(tanda, peta, infowindow, data) {
google.maps.event.addListener(tanda, 'click', function() {
infowindow.setContent(data);
infowindow.open(peta, tanda);
});
}
function reload(form){
var val=form.org_id.options[form.org_id.options.selectedIndex].value;
self.location='main_page.php?cabang=' + val ;
}
</script>
<!--[if IE]><script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script><![endif]-->
</head>
<body>
<div id="wrapper"><!-- #wrapper -->
<header><!-- header -->
<br><br><br>
<h1></h1>
</header><!-- end of header -->
<section id="main"><!-- #main content area -->
<div id="map_canvas" style=" align: left; width:1000px; height:500px"></div><br>
<?php require ('config.php');
#$cabang=$_GET['cabang'];
/*if(strlen($cabang) > 0 and !is_numeric($cabang)){
echo "Data Error";
exit;
}*/
$quer2=pg_query("SELECT DISTINCT orgid FROM epmgis order by orgid");
if(isset($cabang) and strlen($cabang)){
$quer=pg_query("SELECT DISTINCT nm_rayon FROM epmgis where orgid=$cabang order by nm_rayon");
}
else{$quer=pg_query("SELECT DISTINCT nm_rayon FROM epmgis order by nm_rayon"); }
echo"<table>";
echo"<tr>";
echo "<form method=post name=f1 action='proses_map.php'>";
echo " <td>Silahkan Pilih Kode Cabang </td><td>:</td><td><select name='org_id' onchange=\"reload(this.form)\"><option value=''></option>";
while($noticia2 = pg_fetch_array($quer2)) {
if($noticia2['orgid']==#$cabang){echo "<option selected value='$noticia2[orgid]'>$noticia2[orgid]</option>"."<BR>";}
else{echo "<option value='$noticia2[orgid]'>$noticia2[orgid]</option>";}
}
echo "</select></td></tr>";
echo"<br>";
echo "<tr><td>Silahkan Pilih Rayon</td><td>:</td><td><select name='rayon'><option value=''></option>";
while($noticia = pg_fetch_array($quer)) {
echo "<option value='$noticia[nm_rayon]'>$noticia[nm_rayon]</option>";
}
echo "</select></td></tr>";
echo "<tr><td><input type=submit value=Submit>";
echo "</form>";
echo"</td></tr>";
echo"</table>";
?>