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POGoogle Maps V3: Updating Markers Periodically
 

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    <p>I've followed the PHP/MYSQL tutorial on Google Maps found <strong><a href="http://code.google.com/apis/maps/articles/phpsqlajax_v3.html" rel="nofollow">here</a></strong>.</p> <p>I'd like the markers to be updated from the database every 5 seconds or so.</p> <p>It's my understanding I need to use Ajax to periodicity update the markers, but I'm struggling to understand where to add the function and where to use <strong>setTimeout()</strong> etc</p> <p>All the other examples I've found don't really explain what's going on, some helpful guidance would be terrific!</p> <p>This is my code (Same as Google example with some <strong>var</strong> changes):</p> <pre><code>function load() { var map = new google.maps.Map(document.getElementById("map"), { center: new google.maps.LatLng(37.80815648152641, 140.95355987548828), zoom: 13, mapTypeId: 'roadmap' }); var infoWindow = new google.maps.InfoWindow; // Change this depending on the name of your PHP file downloadUrl("nwmxml.php", function(data) { var xml = data.responseXML; var markers = xml.documentElement.getElementsByTagName("marker"); for (var i = 0; i &lt; markers.length; i++) { var host = markers[i].getAttribute("host"); var type = markers[i].getAttribute("active"); var lastupdate = markers[i].getAttribute("lastupdate"); var point = new google.maps.LatLng( parseFloat(markers[i].getAttribute("lat")), parseFloat(markers[i].getAttribute("lng"))); var html = "&lt;b&gt;" + "Host: &lt;/b&gt;" + host + "&lt;br&gt;" + "&lt;b&gt;Last Updated: &lt;/b&gt;" + lastupdate + "&lt;br&gt;"; 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() {} </code></pre> <p>I hope somebody can help me!</p>
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