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POresponseText works but responseXML is always null
 

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    <p>I've looked through every answer i can find on here and can't solve this. I'm pretty sure I havn't missed anything obvious.</p> <p>I'm trying to load map markers based on lat longs. The problem is when I try to return the AJAX response as responseXML its always null, if i use responseText it works fine but obviously the next step doesn't work.</p> <p>This is the PHP that generates the XML:</p> <pre><code>&lt;?php header('Content-type: text/xml'); ?&gt; &lt;?xml version="1.0" encoding="ISO-8859-1"?&gt; &lt;properties&gt; &lt;![CDATA[ &lt;?php if ($body != null): foreach ($body as $property): ?&gt; &lt;property&gt; &lt;lat&gt;&lt;?php echo $property -&gt; lat; ?&gt;&lt;/lat&gt; &lt;long&gt;&lt;?php echo $property -&gt; long; ?&gt;&lt;/long&gt; &lt;name&gt;&lt;?php echo $property -&gt; property_name; ?&gt;&lt;/name&gt; &lt;/property&gt; &lt;?php endforeach; endif; ?&gt; ]]&gt; &lt;/properties&gt; </code></pre> <p>I can see in Fiddler that the request is made ok</p> <blockquote> <p>GET /letsgo/index.php/hotmaps/get_properties_ajax/22.270888501350186/22.288560098193066/114.13720860290528/114.19827713775635 HTTP/1.1</p> <p>Entity Content-type: text/xml</p> </blockquote> <p>Although when i view this in XML view in fiddler it appears to be empty,</p> <p>here is the raw response</p> <pre><code>HTTP/1.1 200 OK Date: Tue, 15 Jan 2013 11:04:27 GMT Server: Apache/2.4.2 (Win32) PHP/5.4.4 X-Powered-By: PHP/5.4.4 Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma: no-cache Content-Length: 310 Keep-Alive: timeout=5, max=100 Connection: Keep-Alive Content-Type: text/xml &lt;?xml version="1.0" encoding="ISO-8859-1"?&gt; &lt;properties&gt; &lt;![CDATA[ &lt;property&gt; &lt;lat&gt;22.2776&lt;/lat&gt; &lt;long&gt;114.173&lt;/long&gt; &lt;name&gt;Kaxo Tower test&lt;/name&gt; &lt;/property&gt; &lt;property&gt; &lt;lat&gt;22.2803&lt;/lat&gt; &lt;long&gt;114.16&lt;/long&gt; &lt;name&gt;Kuno Tower&lt;/name&gt; &lt;/property&gt; ]]&gt; &lt;/properties&gt; </code></pre> <p>Here is the create marker function that is called every time the map is moved</p> <pre><code>// make the ajax request function loadXMLDoc(downUrl){ var xmlhttp; if (window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200) { //var propertiesXml = xmlhttp.responseText; // WORKS FINE!! var propertiesXml = xmlhttp.responseXML; // ALWAYS null //alert(propertiesXml); var propertiesRows = propertiesXml.getElementsByTagName("property"); for (var i = 0; i &lt; propertiesRows.length; i++) { var propertiesRow = propertiesRows[i]; var xmlLat = propertiesRow.getElementsByTagName("lat")[0]; var xmlLong = propertiesRow.getElementsByTagName("long")[0]; var propertyLatLong = new google.maps.LatLng(parseFloat(xmlLat.firstChild.data),parseFloat(xmlLat.firstChild.data)); // create each marker createMarker(propertyLatLong); }   } } xmlhttp.open("GET", downUrl, false); // false or true? makes no difference xmlhttp.setRequestHeader("Content-type", "text/xml"); xmlhttp.send(); } </code></pre> <p>and this is the error i get for feeding getElementsByTagName with null, Chrome console says</p> <blockquote> <p>Uncaught TypeError: Cannot call method 'getElementsByTagName' of null</p> </blockquote> <p>This is running on my local Apache</p> <p>Any suggestions?</p> <p>/** UPDATE - WORKING CODE **/</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;style type="text/css"&gt; html { height: 100% } body { height: 100%; margin: 0; padding: 0 } #map_canvas { height: 100% } &lt;/style&gt; &lt;script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=APIKEYHERE&amp;sensor=false"&gt; &lt;/script&gt; &lt;script type="text/javascript"&gt; // initialise map function initialize() { // set starting latlong var myLatlng = new google.maps.LatLng(22.2776, 114.173); // set initial map options var mapOptions = { center: myLatlng, zoom: 13, mapTypeId: google.maps.MapTypeId.ROADMAP }; // create the map var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions); // listen for changes in map bounds - after map has stopped moving!! google.maps.event.addListener(map,'idle', function () { loadByBounds(map); }); } // if the bounds have changed function loadByBounds(map) { var bounds = map.getBounds(); var swPoint = bounds.getSouthWest(); var nePoint = bounds.getNorthEast(); // specific co ordinates var swLat = swPoint.lat(); var swLng = swPoint.lng(); var neLat = nePoint.lat(); var neLng = nePoint.lng(); var downUrl = "&lt;?php echo site_url('hotmaps/get_properties_ajax'); ?&gt;/"+swLat+"/"+neLat+"/"+swLng+"/"+neLng; // load the loadXMLDoc(downUrl, map); // clear icons outside of bounding box //.... } // make the ajax request function loadXMLDoc(downUrl, map){ var xmlhttp; if (window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200) { var propertiesXml = xmlhttp.responseText; // WORKS FINE!! // remove whitespaces from start and end (.trim() doesnt work) propertiesXml = propertiesXml.replace(/^\s+|\s+$/g,''); // manually parse to XML DOM object var parser = new DOMParser(); var xmlDoc; try { xmlDoc = parser.parseFromString (propertiesXml, "text/xml"); } catch (e) { alert ("XML parsing error."); return false; }; //console.log(xmlDoc); // get each property var propertiesRows = xmlDoc.getElementsByTagName("property"); //alert(console.log(propertiesRows)); for (var i = 0; i &lt; propertiesRows.length; i++) { var propertiesRow = propertiesRows[i]; var xmlLat = propertiesRow.getElementsByTagName("lat")[0]; var xmlLong = propertiesRow.getElementsByTagName("long")[0]; var propertyLatLong = new google.maps.LatLng(parseFloat(xmlLat.firstChild.data),parseFloat(xmlLong.firstChild.data)); // create each marker createMarker(propertyLatLong, map); } } } xmlhttp.open("GET", downUrl, false); xmlhttp.setRequestHeader("Content-type", "text/xml"); xmlhttp.send(); } // create new markers function createMarker(propertyLatLong, map){ var dynamicMarker = new google.maps.Marker({ map:map, draggable:false, position: propertyLatLong }); debugger; } &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>
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