Question

我在MySQL中建立了一个数据库，其中包含一些信息和长/短数据。我希望这些数据作为标记显示在我的Google地图页面上，这样我就不必手动将标记添加到脚本中。

我已经按照几个教程进行了尝试，并且尝试了多个脚本，下面显示的是唯一一个没有出错的脚本。但是，尽管没有错误，但标记不会出现在地图上。我一生无法弄清楚哪里出了问题。

我有3个单独的脚本：用于登录详细信息的“ config.php” ，用于调用数据的“ mapsxml.php” 和 “ index.html” 创建地图并将数据添加为标记。

配置脚本：

<?php
$username="mydatabase_username";
$password="12345";
$database="mydatabase";
?>

MapsXML脚本：

<?php
require("config.php");

function parseToXML($htmlStr)
{
$xmlStr=str_replace('<','&lt;',$htmlStr);
$xmlStr=str_replace('>','&gt;',$xmlStr);
$xmlStr=str_replace('"','&quot;',$xmlStr);
$xmlStr=str_replace("'",'&#39;',$xmlStr);
$xmlStr=str_replace("&",'&amp;',$xmlStr);
return $xmlStr;
}

// Create connection
$connection = mysqli_connect(localhost, $username, $password);

// Check connection
if (!$connection) {
    die("Connection failed: " . mysqli_connect_error());
}
echo "Connected successfully";

// Set the active MySQL database
$db_selected = mysqli_select_db($connection,"mydatabase");
if (!$db_selected) {
  die ('Can\'t use db : ' . mysqli_error());
}

// Select all the rows in the markers table
$query = "SELECT * FROM userlocations WHERE 1";
$result = mysqli_query($connection, $query);
if (!$result) {
  die('Invalid query: ' . mysqli_error());
}

header("Content-type: text/xml");

// Start XML file, echo parent node
echo "<?xml version='1.0' ?>";
echo '<userlocations>';
$ind=0;
// Iterate through the rows, printing XML nodes for each
while ($row = mysqli_fetch_assoc($result)){
  // Add to XML document node
  echo '<marker ';
  echo 'id="' . $row['id'] . '" ';
  echo 'name="' . parseToXML($row['name']) . '" ';
  echo 'address="' . parseToXML($row['address']) . '" ';
  echo 'lat="' . $row['lat'] . '" ';
  echo 'lng="' . $row['lng'] . '" ';
  echo '/>';
  $ind = $ind + 1;
}

// End XML file
echo '</userlocations>';

?>

Index.html脚本：

<!DOCTYPE html >
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
    <title>User locations</title>
    <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>

<html>
  <body>
    <div id="map"></div>

    <script>
        function initMap() {
        var map = new google.maps.Map(document.getElementById('map'), {
          center: new google.maps.LatLng(51.153844, 5.942341),
          zoom: 12
        });
        var infoWindow = new google.maps.InfoWindow;

          // Change this depending on the name of your PHP or XML file
          downloadUrl('maps_xml.php', function(data) {
            var xml = data.responseXML;
            var markers = xml.documentElement.getElementsByTagName('marker');
            Array.prototype.forEach.call(markers, function(markerElem) {
              var id = markerElem.getAttribute('id');
              var name = markerElem.getAttribute('name');
              var address = markerElem.getAttribute('address');
              var point = new google.maps.LatLng(
                  parseFloat(markerElem.getAttribute('lat')),
                  parseFloat(markerElem.getAttribute('lng')));

              var infowincontent = document.createElement('div');
              var strong = document.createElement('strong');
              strong.textContent = name
              infowincontent.appendChild(strong);
              infowincontent.appendChild(document.createElement('br'));

              var text = document.createElement('text');
              text.textContent = address
              infowincontent.appendChild(text);
              var icon = customLabel[type] || {};
              var marker = new google.maps.Marker({
                map: map,
                position: point,
                label: icon.label
              });
              marker.addListener('click', function() {
                infoWindow.setContent(infowincontent);
                infoWindow.open(map, marker);
              });
            });
          });
        }



      function downloadUrl(url, callback) {
        var request = window.ActiveXObject ?
            new ActiveXObject('Microsoft.XMLHTTP') :
            new XMLHttpRequest;

        request.onreadystatechange = function() {
          if (request.readyState == 4) {
            request.onreadystatechange = doNothing;
            callback(request, request.status);
          }
        };

        request.open('GET', url, true);
        request.send(null);
      }

      function doNothing() {}
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=MY_APIKEY &callback=initMap">
    </script>
  </body>
</html>

如何从MySQL数据库向googlemaps javascript api添加标记？

0 个答案: