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POGoogle Maps V3: Updating Markers
 

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  1. POGoogle Maps V3: Updating Markers
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    <p>I have some issues with Google maps api v3. I managed to create a map where new markers are displayed when the user drag the map. However, it do not delete the past markers. I have read many tutorials and thread (especially this one: <a href="https://stackoverflow.com/questions/9626134/google-maps-v3-updating-markers-periodically">Google Maps V3: Updating Markers Periodically</a>) without success.</p> <p>Here is my main page:</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta name="viewport" content="initial-scale=1.0, user-scalable=no" /&gt; &lt;meta http-equiv="content-type" content="text/html; charset=UTF-8" /&gt; &lt;title&gt;Développez avec les API Google Maps&lt;/title&gt; &lt;style type="text/css"&gt; html { height: 100%; } body { height: 100%; margin: 0px; padding: 0px; } #map_canvas { height: 100%; } &lt;/style&gt; &lt;script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; function createXmlHttpRequest() { try { if (typeof ActiveXObject != 'undefined') { return new ActiveXObject('Microsoft.XMLHTTP'); } else if (window["XMLHttpRequest"]) { return new XMLHttpRequest(); } } catch (e) { changeStatus(e); } return null; }; function downloadUrl(url, callback) { var status = -1; var request = createXmlHttpRequest(); if (!request) { return false; } request.onreadystatechange = function() { if (request.readyState == 4) { try { status = request.status; } catch (e) { } if (status == 200) { callback(request.responseText, request.status); request.onreadystatechange = function() {}; } } } request.open('GET', url, true); try { request.send(null); } catch (e) { changeStatus(e); } }; function xmlParse(str) { if (typeof ActiveXObject != 'undefined' &amp;&amp; typeof GetObject != 'undefined') { var doc = new ActiveXObject('Microsoft.XMLDOM'); doc.loadXML(str); return doc; } if (typeof DOMParser != 'undefined') { return (new DOMParser()).parseFromString(str, 'text/xml'); } return createElement('div', null); } var map; function initialize() { var latlng = new google.maps.LatLng(46.7, 2.5); var myOptions = { zoom: 6, center: latlng, mapTypeId: google.maps.MapTypeId.ROADMAP }; map = new google.maps.Map(document.getElementById('map_canvas'), myOptions); downloadUrl("getPoi2.php", function(data) { var xml = xmlParse(data); var markers = xml.documentElement.getElementsByTagName("marker"); for (var i = 0; i &lt; markers.length; i++) { createMarker(parseFloat(markers[i].getAttribute("lat")), parseFloat(markers[i].getAttribute("lng")), markers[i].getAttribute('titre')); } }); /* Ici, on ajoute l'écouteur d'événement suite à un glisser / déposer */ google.maps.event.addListener(map, 'dragend', function() { var bds = map.getBounds(); var South_Lat = bds.getSouthWest().lat(); var South_Lng = bds.getSouthWest().lng(); var North_Lat = bds.getNorthEast().lat(); var North_Lng = bds.getNorthEast().lng(); downloadUrl("getPoi.php?maxlat="+North_Lat+"&amp;minlat="+South_Lat+"&amp;minlong="+South_Lng+"&amp;maxlong="+North_Lng, function(data) { var xml = xmlParse(data); var markers = xml.documentElement.getElementsByTagName("marker"); for (var i = 0; i &lt; markers.length; i++) { createMarker(parseFloat(markers[i].getAttribute("lat")), parseFloat(markers[i].getAttribute("lng")), markers[i].getAttribute('titre')); } }); }); } function createMarker(lat, lng, titre){ var latlng = new google.maps.LatLng(lat, lng); var marker = new google.maps.Marker({ position: latlng, map: map, title: titre }); } &lt;/script&gt; &lt;/head&gt; &lt;body onload="initialize()"&gt; &lt;div id="map_canvas" style="width: 100%; height: 100%;"&gt;&lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>And there is my getPoin.php:</p> <pre><code>&lt;?php $user = "root"; $password = ""; $host = "localhost"; $bdd = "citiesinvaders"; mysql_connect($host,$user,$password); mysql_select_db($bdd) or die("erreur de connexion à la base de données"); $sql = "SELECT * FROM location order by city desc limit 1"; $res = mysql_query($sql) or die(mysql_error()); $dom = new DomDocument('1.0', 'utf-8'); $node = $dom-&gt;createElement("markers"); $parnode = $dom-&gt;appendChild($node); while ($result = mysql_fetch_array($res)){ $node = $dom-&gt;createElement("marker"); $newnode = $parnode-&gt;appendChild($node); $newnode-&gt;setAttribute("city", $result["city"]); $newnode-&gt;setAttribute("lat", $result["latitude"]); $newnode-&gt;setAttribute("lng", $result["longitude"]); } $xmlfile = $dom-&gt;saveXML(); echo $xmlfile; ?&gt; </code></pre> <p>Thank you for your help!</p>
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    1. COTo clarify... When the map is moved the markers are placed over the old markers? A.K.A. They are 'doubling up' on map drag?
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      1. POGoogle Maps V3: Updating Markers
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