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09.18.2008 at 03:33PM PDT, ID: 23744270
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8.0

Using two XML files at once in Google Maps API

Asked by RobPal in Asynchronous Javascript and XML (AJAX), JavaScript, Active Server Pages (ASP)

Tags: ,

Hi there experts!

I am developing a site using Google Maps API and I am trying to dynamically create markers with info windows filled with information stored in an XML file which was also dynamically created during the page load process.

I think my problem may stem from trying to have two XML files being read simultaneously.

The basic code to place a marker using lat and lng from an XML file works perfectly and also populating an info window for each marker using randomly generated numbers in javascript.  The problem occurs when I try and generate html for the infowindow by reading value from another XML file.  The first XML file is still being read at the same time as it's looping through each marker to get the lat and lng values then as it's placing the marker and before it moves onto the next one it goes to the next XML file to pull through the values for the infowindow html.

I get the following error when a marker is clicked on the map:-

documentElement is null or not an object

The code is below(starting with the display_sales function but problem occurring within the createHTML function), any help you can give would be most appreciated.

I've also attached my xml files but in txt format as it won't let me upload xml files.

Cheers,

RobStart Free Trial 
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<script type="text/javascript">
 var geocoder = new GClientGeocoder(); 
 var map = null;
 
    function initialize() {
          if (GBrowserIsCompatible()) {
          			map = new GMap2(document.getElementById("map_canvas"));                 
                          map.setCenter(new GLatLng(54.3165, -3.2520), 5);
                          map.addControl(new GSmallMapControl());
                          map.addControl(new GMapTypeControl());
                                }    } 
                
    function showAddress(address) {
      if (geocoder) {
        geocoder.getLatLng(
          address,
          function(point) {
            if (!point) {
              alert(address + " not found");
            } else {
              map.setCenter(point, 13);
              //var marker = new GMarker(point);
              //map.addOverlay(marker);
            	   }
            			  }
        				  );
    				}
    				}
    
    function createHTML(s_code) {
    var scode = "\"" + s_code + "\"";
    GDownloadUrl("images/data/infwin.xml", function(data, responseCode) {
    var xml2 = GXml.parse(data);
    var infwins = xml2.documentElement.getElementsByTagName(scode);
    var o_name = parseFloat(infwins[0].getAttribute("name"));
    var o_add1 = parseFloat(infwins[0].getAttribute("add1"));
    myhtml2 = "<font face=Arial size=2><b>Sale Code: " + scode + "</b></font><br>";
    //myhtml2 = myhtml2 + "<font face=Arial size=2><b>Outlet Name: " + o_name + "</b></font><br>";
    //html = html + "<font style=Arial size=2 color=red><p>" + o_add1 + "</p></font><br>";
	}
	);
    return myhtml2;
    }
    
    
	function createMarker(point,myhtml) {
  	var marker = new GMarker(point);
  	GEvent.addListener(marker, "click", function() {
    marker.openInfoWindowHtml(createHTML(myhtml));
  	});
  	return marker;
	}
			
    function display_sales() {
    GDownloadUrl("images/data/mkrs.xml", function(data, responseCode) {
    var xml = GXml.parse(data);
    var markers = xml.documentElement.getElementsByTagName("marker");
    var outlets = xml.documentElement.getElementsByTagName("outlet");
    for (var i = 0; i < markers.length; i++) {
    var point = new GLatLng(parseFloat(markers[i].getAttribute("lat")),
    parseFloat(markers[i].getAttribute("lng")));
    var html = outlets[i].getAttribute("s_code");
    map.addOverlay(createMarker(point, html));
    }});
 
}			 
</script>
Attachments:
 
infwin.txt (111 bytes) (Possible File Type Mismatch) 
The file for the info windows data (the second one to be accessed)
 
 
mkrs.txt (225 bytes) (Possible File Type Mismatch) 
The primary markers data (the first one to be accessed and the one that works fine)
 
[+][-]09.20.2008 at 10:39AM PDT, ID: 22530768

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[+][-]09.20.2008 at 11:37AM PDT, ID: 22531029

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[+][-]09.20.2008 at 03:41PM PDT, ID: 22531990

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About this solution

Zones: Asynchronous Javascript and XML (AJAX), JavaScript, Active Server Pages (ASP)
Tags: ASP, Javascript, documentElement is null or not an object
Sign Up Now!
Solution Provided By: RobPal
Participating Experts: 1
Solution Grade: A
 
 
[+][-]09.22.2008 at 03:48AM PDT, ID: 22538802

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