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  1. POGoogle Maps Sidebar
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    <p>I have been using <a href="https://stackoverflow.com/questions/4904549/open-infowindow-of-specific-marker-from-outside-google-maps-v3">Open infoWindow of specific marker from outside Google Maps (V3)</a> to try and implement a sidebar into one of my map pages. I've put together the following code (see below) but I'm getting an error when I try and open the page. The error is 'document.getElementById(...)' is null or not an object' and it is pointing to this line : </p> <pre><code>document.getElementById("locationslist").innerHTML = locationslist; </code></pre> <p>I've been looking at this now for quite some time and I just can't see what the error is. </p> <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml" lang="en"&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt; &lt;title&gt;All Locations&lt;/title&gt; &lt;link rel="stylesheet" href="css/alllocationsstyle.css" type="text/css" media="all" /&gt; &lt;script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false&amp;language=en"&gt;&lt;/script&gt; &lt;div id="map"&gt;&lt;/div&gt; &lt;div id="locationslist"&gt;&lt;/div&gt; &lt;body onload="showLocations()"&gt; &lt;script type="text/javascript"&gt; var map; var gmarkers = new Array(); var locationslist; function showLocations() { map = new google.maps.Map(document.getElementById("map"), { center: new google.maps.LatLng(54.312195845815246,-4.45948481875007), zoom:6, mapTypeId: 'terrain' }); var infoWindow = new google.maps.InfoWindow; // Change this depending on the name of your PHP file downloadUrl("phpfile.php", function(data) { var xml = data.responseXML; gmarkers = xml.documentElement.getElementsByTagName("marker"); var bounds = new google.maps.LatLngBounds(); for (var i = 0; i &lt; gmarkers.length; i++) { var locationname = gmarkers[i].getAttribute("locationname"); var address = gmarkers[i].getAttribute("address"); var locationid = gmarkers[i].getAttribute("locationid"); var point = new google.maps.LatLng( parseFloat(gmarkers[i].getAttribute("osgb36lat")), parseFloat(gmarkers[i].getAttribute("osgb36lon"))); var html = "&lt;b&gt;" + locationname + "&lt;/b&gt; &lt;br/&gt;" + address; bounds.extend(point); var marker = new google.maps.Marker({ map: map, position: point, locationid: locationid }); bindInfoWindow(marker, map, infoWindow, html); locationslist += "&lt;div onclick=scrollToMarker(" + i + ")&gt;"+locationname+"&lt;/div&gt;"; } map.setCenter(bounds.getCenter()); map.fitBounds(bounds); //display company data in html document.getElementById("locationslist").innerHTML = locationslist; }); } function scrollToMarker(index) { map.panTo(gmarkers[index].getPosition()); } 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(){ } &lt;/script&gt; &lt;/head&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. COYou're missing a bracket from here: <div id="map"</div>. Is that just a typo on here, or is it the same on your actual page?
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      1. USCraig A Rodway
    2. COHi, many thanks for replying to my post and pointing out one of the mistakes. I've now put the bracket in, but I'm now getting the following error: 'gmarkers[...]' is null or not an object' and it is pointing to this line map.panTo(gmarkers[index].getPosition());. I don't suppose you've any ideas please where I'm going wrong now? Many thanks once again and kind regards. Chris
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    3. CO"var gmarkers = xml.documentElement...." . You are re-declaring the variable as local to that function. Try removing 'var' from the beginning of that line.
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      1. USCraig A Rodway
 

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