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Home/ Questions/Q 7821383
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Editorial Team
  • 0
Editorial Team
Asked: June 2, 20262026-06-02T07:37:58+00:00 2026-06-02T07:37:58+00:00

I pretty much copied the code from the tutorial: https://developers.google.com/maps/articles/phpsqlajax_v3 (Of course, I made

  • 0

I pretty much copied the code from the tutorial:
https://developers.google.com/maps/articles/phpsqlajax_v3
(Of course, I made the proper changes, I guess).

Can you help me figure out why the map is not showing up?

I am using MySQL/PHP to generate an XML output (Similar code as the tutorial):

<?php
require("database.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; 
} 

// Opens a connection to a MySQL server
$connection=mysql_connect ($localhost, $username, $password);
if (!$connection) {
  die('Not connected : ' . mysql_error());
}

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

// Select all the rows in the tbl_address table
$query = "SELECT * FROM tbl_address WHERE 1";
$result = mysql_query($query);
if (!$result) {
  die('Invalid query: ' . mysql_error());
}

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

// Start XML file, echo parent node
echo '<markers>';

// Iterate through the rows, printing XML nodes for each
while ($row = @mysql_fetch_assoc($result)){
  // ADD TO XML DOCUMENT NODE
  echo '<marker ';
  echo 'name="' . parseToXML($row['address']) . '" ';
  echo 'address="' . parseToXML($row['address']) . '" ';
  echo 'lat="' . $row['latitude'] . '" ';
  echo 'lng="' . $row['longitude'] . '" ';
  echo 'type="USC Student Housing" ';
  echo '/>';
}

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

?>

Here is the map (Similar code as the tutorial):

<!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>PHP/MySQL & Google Maps Example</title>
    <script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
    <script type="text/javascript">
    //<![CDATA[

    var customIcons = {
      restaurant: {
        icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png',
        shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
      },
      bar: {
        icon: 'http://labs.google.com/ridefinder/images/mm_20_red.png',
        shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
      }
    };

    function load() {
      var map = new google.maps.Map(document.getElementById("map"), {
        center: new google.maps.LatLng(34.026485, -118.283794),
        zoom: 14,
        mapTypeId: 'roadmap'
      });
      var infoWindow = new google.maps.InfoWindow;

      // Change this depending on the name of your PHP file
      downloadUrl("http://firstchoicehousing.com/_api/google/maps/phpsqlajax_genxml2.php", function(data) {
        var xml = data.responseXML;
        var markers = xml.documentElement.getElementsByTagName("marker");
        for (var i = 0; i < markers.length; i++) {
          var name = markers[[]i].getAttribute("name");
          var address = markers[[]i].getAttribute("address");
          var type = markers[[]i].getAttribute("type");
          var point = new google.maps.LatLng(
              parseFloat(markers[[]i].getAttribute("lat")),
              parseFloat(markers[[]i].getAttribute("lng")));
          var html = "<b>" + name + "</b> <br/>" + address;
          var icon = customIcons[[]type] || {};
          var marker = new google.maps.Marker({
            map: map,
            position: point,
            icon: icon.icon,
            shadow: icon.shadow
          });
          bindInfoWindow(marker, map, infoWindow, html);
        }
      });
    }

    function bindInfoWindow(marker, map, infoWindow, html) {
      google.maps.event.addListener(marker, 'click', function() {
        infoWindow.setContent(html);
        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>

  </head>

  <body onload="load()">
    <div id="map" style="width: 500px; height: 300px"></div>
  </body>

</html>
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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-06-02T07:38:00+00:00Added an answer on June 2, 2026 at 7:38 am

    The changes need to be made to every one of the syntax errors. The full js is below. here is a fiddle, it doesn’t show the markers because I can’t use ajax cross domain to get the list but you can see the map load. http://jsfiddle.net/zvmdp/

    edit
    changed your code to this and it runs

    var customIcons = {
          restaurant: {
            icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png',
            shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
          },
          bar: {
            icon: 'http://labs.google.com/ridefinder/images/mm_20_red.png',
            shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
          }
        };
    
        function load() {
          var map = new google.maps.Map(document.getElementById("map"), {
            center: new google.maps.LatLng(34.026485, -118.283794),
            zoom: 14,
            mapTypeId: 'roadmap'
          });
          var infoWindow = new google.maps.InfoWindow;
    
          // Change this depending on the name of your PHP file
          downloadUrl("http://firstchoicehousing.com/_api/google/maps/phpsqlajax_genxml2.php", function(data) {
            var xml = data.responseXML;
            var markers = xml.documentElement.getElementsByTagName("marker");
            for (var i = 0; i < markers.length; i++) {
              var name = markers[i].getAttribute("name");
              var address = markers[i].getAttribute("address");
              var type = markers[i].getAttribute("type");
              var point = new google.maps.LatLng(
                  parseFloat(markers[i].getAttribute("lat")),
                  parseFloat(markers[i].getAttribute("lng")));
              var html = "<b>" + name + "</b> <br/>" + address;
              var icon = customIcons[type] || {};
              var marker = new google.maps.Marker({
                map: map,
                position: point,
                icon: icon.icon,
                shadow: icon.shadow
              });
              bindInfoWindow(marker, map, infoWindow, html);
            }
          });
        }
    
        function bindInfoWindow(marker, map, infoWindow, html) {
          google.maps.event.addListener(marker, 'click', function() {
            infoWindow.setContent(html);
            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() {}
    
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