我必须尝试从db获取lat，lng值并像这样在json中编码结果
[{"name":"ahmedabad,GUJ","lat":"72.5226896","lng":"72.5226896"}]
但标记不在地图上显示（位置不在地图上显示）
这是我的代码，我的错误请指导我
<?php
include "db.php";
/* lat/lng data will be added to this array */
$locations=array();
$query = $db->query("SELECT * FROM ds_petroling_history");
while( $row = $query->fetch_assoc() ){
$nama_kabkot = $row['name'];
$longitude = $row['lng'];
$latitude = $row['lat'];
/* Each row is added as a new array */
$locations[]=array( 'name'=>$nama_kabkot, 'lat'=>$longitude, 'lng'=>$longitude );
}
/* Convert data to json */
$markers = json_encode($locations);
?>
<html>
<head>
</head>
<body>
<div><?php echo $markers ?></div>
<script type='text/javascript'>
<?php
echo "var markers=$markers;\n";
?>
function initMap() {
var latlng = new google.maps.LatLng(23.0117523,72.5226665);
var myOptions = {
zoom: 10,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP,
mapTypeControl: false
};
var map = new google.maps.Map(document.getElementById("peta"),myOptions);
var infowindow = new google.maps.InfoWindow(), marker, lat, lng;
var json=JSON.parse( markers );
for( var o in json ){
lat = json[ o ].lat;
lng=json[ o ].lng;
name=json[ o ].name;
marker = new google.maps.Marker({
position: new google.maps.LatLng(lat,lng),
name:name,
map: map
});
google.maps.event.addListener( marker, 'click', function(e){
infowindow.setContent( this.name );
infowindow.open( map, this );
}.bind( marker ) );
}
}
</script>
<div id="peta" style="width: 100%; height: 660px;">
</div>
<script async defer src="https://maps.googleapis.com/maps/api/js?key=yourkey&callback=initMap"
type="text/javascript"></script>
</body>
</html>
从db成功获取的值并在json中编码但在地图上找不到那些坐标位置
你刚刚将标记的值分配给php var而不是javascript var
/* Convert data to json */
$markers = json_encode($locations);
echo "<script>
var markers[] = " . $markers .";
</script>";
?>