从PHP MySql中获取经度和纬度的Mapbox JS-PHP中文网问答

已解决 - 请参阅下面的答案

我有一个名为“locationLogs”的 MySql 数据库和一个名为“locations”的表。我有一个名为 map.php 的页面，它显示地图（使用 Mapbox GLJS API）。然后，我想为“位置”表中的每个位置添加一个标记。该表由“id”、“经度”和“纬度”组成。然后我使用 while 循环来尝试这个。然而，当进入该页面时，它只显示空白，并且不加载地图或任何内容。我的页面代码如下。

<html lang='en'>
<head>
    <meta charset='utf-8' />
    <title>Live Map</title>
    <meta name='viewport' content='width=device-width, initial-scale=1' />
    <link href="https://fonts.googleapis.com/css?family=Open+Sans" rel="stylesheet">
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v2.9.2/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v2.9.2/mapbox-gl.css' rel='stylesheet' />
    <style>
      body {
        margin: 0;
        padding: 0;
      }

      #map {
        position: absolute;
        top: 0;
        bottom: 0;
        width: 100%;
      }
      .marker {
  background-image: url('mapbox-icon.png');
  background-size: cover;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
}

    </style>
</head>
<body>

<div id='map'></div>

<script>

mapboxgl.accessToken = 'MY_ACCESS_TOKEN';

const map = new mapboxgl.Map({
  container: 'map',
  style: 'mapbox://styles/mapbox/light-v10',
  center: [-96, 37.8],
  zoom: 3
});

// code from the next step will go here!
<?php

$conn = mysql_connect("localhost", "DB_USER", "DB_PASS");

if (!$conn) {
    echo "Unable to connect to DB: " . mysql_error();
    exit;
}

if (!mysql_select_db("locationLogs")) {
    echo "Unable to select mydbname: " . mysql_error();
    exit;
}

$sql = "SELECT *
        FROM locations";

$result = mysql_query($sql);

if (!$result) {
    echo "Could not successfully run query ($sql) from DB: " . mysql_error();
    exit;
}

if (mysql_num_rows($result) == 0) {
    echo "No rows found, nothing to print so am exiting";
    exit;
}

?>


const geojson = {
  type: 'FeatureCollection',
  features: [
      <?php
      while ($row = mysql_fetch_assoc($result)) {
    echo '
    {
        type: "Feature",
        geometry: {
            type: "Point",
            coordintes: [' . $row['longitude'] . ', ' . $row['latitude'] . ']
        },
        properties {
            title: "Location",
            description: "A cool location",
        }
    },';
    
}

mysql_free_result($result);
?>
  ]
};

// add markers to map
for (const feature of geojson.features) {
  // create a HTML element for each feature
  const el = document.createElement('div');
  el.className = 'marker';

  // make a marker for each feature and add to the map
  new mapboxgl.Marker(el).setLngLat(feature.geometry.coordinates).addTo(map);
}


</script>

</body>
</html>

?> Live Map

connect_errno ) { printf("Connect failed: %s
", $mysqli->connect_error); exit(); } printf('Connected successfully.
'); $sql = "SELECT * FROM location"; $result = $mysqli->query($sql); if ($result->num_rows > 0) { } else { printf('Unexpected Error. DB did not return enough values for a successful export.
'); } ?>