我尝试在JavaScript中使用PHP返回某些行时遇到问题...
[当我将结果以纯文本形式回显时，它可以正常工作。但是，当我尝试用结果填充地图时，它仅显示数据库中的一行/标记，而不显示表的其余部分
screenshot shows only one marker returning on map instead of all results from the database
这里是页面的完整代码。
<?php include("header.php");
// Connect to the hydrants table and set ORDER BY to ASC or DESC
$sql = "SELECT id, lat, lng, flow, pressure, type, lid, updated FROM hydrants_OLD ORDER BY id ASC";
$result = $conn->query($sql);
// Display the results of the query
while($row = $result->fetch_assoc()) { ;
?>
<head>
<title>Hydrants</title>
<meta name="viewport" content="initial-scale=1.0">
<link rel="Shortcut Icon" href=images/hl.png>
<meta name="mobile-web-app-capable" content="yes">
<link rel="icon" href="images/hl.png">
<!--<meta name="apple-mobile-web-app-capable" content="yes">-->
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="apple-mobile-web-app-title" content="Hydrants">
<link rel="apple-touch-icon" href="images/h-apple.png"><link rel="apple-touch-startup-image" media="(device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2)" href="images/h-apple.png"><link rel="apple-touch-startup-image" media="(device-width: 768px) and (orientation: portrait)" href="images/h-apple.png">
<meta charset="utf-8">
<style>
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
</style>
</head>
<body bgcolor="#ffffff">
<?php
$lat = $row['lat'];
$lng = $row['lng'];
$id = $row['id'];
$flow = $row['flow'];
$pressure = $row['pressure'];
$type = $row['type'];
$lid = $row['lid'];
$updated = $row['updated'];
?>
<?php echo $id, $lat, $lng, $flow, $pressure, $type, $lid, $updated, "<br>" ; } ?>
<div id="map"></div>
<script>
var map, infoWindow;
function initMap(){
// Map options
var options = {
// zoom:17,
zoom:14,
center: {lat: 53.428345, lng: -6.244447},
}
var map = new google.maps.Map(document.getElementById('map'), options);
// Array of markers
var markers = [
// HYDRANTS
{ coords:{lat:<?php echo $lat ?>,lng:<?php echo $lng ?>}, iconImage:'images/hs.png', content:'<h2>Hydrant - Number <?php echo $id ?></h2><b>Flow</b> <?php echo $flow ?> Liters per minute<br><b>Pressure</b> <?php echo $pressure ?> bar<br><br><?php echo $type ?><br><?php echo $lid ?><br><br><center><a href=images/hydrants/<?php echo $id ?>.jpg><img src=images/hydrants/<?php echo $id ?>.jpg width=100%></a>Updated <?php echo $updated ?><br><br><a href="report.php?id=<?php echo $id ?>">Report problem with this hydrant</a></center>' }
];
// Loop through markers
for(var i = 0;i < markers.length;i++){
// Add marker
addMarker(markers[i]);
}
// Add Marker Function
function addMarker(props){
var marker = new google.maps.Marker({
position:props.coords,
map:map,
//icon:props.iconImage
});
// Check for customicon
if(props.iconImage){
// Set icon image
marker.setIcon(props.iconImage);
}
// Check content
if(props.content){
var infoWindow = new google.maps.InfoWindow({
content:props.content
});
marker.addListener('click', function(){
infoWindow.open(map, marker);
});
}
}
infoWindow = new google.maps.InfoWindow;
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=0000MYAPIKEY0000&callback=initMap">
</script>
</body>
<?php
// Close database connection
$conn->close();
?>
问题是您在循环部分中有html代码，这意味着您正在为每个坐标创建一个地图。我认为，考虑到您的代码，最好的方法是创建一个标记数组，然后使用json_encode方法将其转换为JSON并将其打印到javascript代码上的变量中。