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請幫助我如何在給定的代碼中使用AJAX在5秒內自動加載地圖,以便數據庫中的數據每隔5秒獲取一次。在此代碼中,每次獲取地圖中的新數據我必須刷新整個page.please幫我只加載地圖在地圖,以顯示新的地方 如何自動加載谷歌地圖
#panel {
position: absolute;
top: 5px;
left: 50%;
margin-left: -180px;
width: 350px;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
}
html, body, #map {
height:500px;
width:920px;
margin: 0;
}
#latlng{
width:225px;
}
</style>
<title>maptest2 </title>
<html>
<!--<meta http-equiv="refresh" content="6">-->
<script src="https://maps.googleapis.com/maps/api/js?sensor=false&libraries=weather"></script>
<script type="text/javascript">
</script>
<?php
$tes=1;
mysql_connect('localhost','root','');
mysql_select_db('gps_test1');
?>
<div id="map"> </div>
<?php
$lat=27.693377;
$lon=85.282783;
sleep(2);
?>
<?php $b=1; ?>
<script type="text/javascript">
var linebreak = "<br />";
//document.write("For loop code is beginning")
var add=[];
var arr=[];
var lat2=[];
var lon2=[];
<?php /*
var lat2= <?php echo json_encode($latt); ?>;
var lon2=<?php echo json_encode($lonn); ?>;
*/?>
var add=[];
var a;
var j = 1;
var i=1;
var llat=<?php echo $lat ?>;
var llon=<?php echo $lon ?>;
function codeLatLng() {
document.getElementById("add2").innerHTML=j;
i=i+1;
<?php
//print_r($row);
//header("refresh: 3;");
$sql=mysql_query("select * from tbl_latlng2 order by sno desc");
$row=mysql_fetch_assoc($sql);
$latt=$row['lat'];
$lonn=$row['lon'];
$location=$row['location'];
$sno=$row['sno'];
$tes=$tes+1;
sleep(2);
?>
latlng = new google.maps.LatLng(<?php echo $latt ?> , <?php echo $lonn ?>);//lat2[j],lon2[j]);
map.setZoom(21);
var marker = new google.maps.Marker({
position: latlng,
map: map,
center:latlng
});
infowindow.setContent("<?php echo $location ?>");
infowindow.open(map,marker);
marker.setMap(map);
//document.getElementById("add").innerHTML=results[1].formatted_address;
//document.getElementById("add2").innerHTML=Date();
document.getElementById("add").innerHTML="<?php echo $sno."now ".$tes ?>";
j=j+1;
<?php
header("Cache-Control: no-cache");
?>
//window.setInterval(codeLatLng,5000);
}
setTimeout(codeLatLng,5000);
function initialize(){
infowindow = new google.maps.InfoWindow();
latlng=new google.maps.LatLng(<?php echo $lat ?>, <?php echo $lon ?>);
geocoder=new google.maps.Geocoder();
var mapOptions = {
center:latlng,
zoom: 10,
mapTypeId: google.maps.MapTypeId.TERRAIN
};
map = new google.maps.Map(document.getElementById('map'), mapOptions);
}
//google.maps.event.addDomListener(window,'load',initialize);
google.maps.event.addDomListener(window,'load',initialize);
</script>
<body onLoad="codeLatLng()">
<p id="add"></p>
<p id="add2"></p>
<script>
//document.write(add[3]);
</script>
</body>
</html>