javascript error while reading xml file in ie

Question

I am facing problem for reading xml file using javascript.

It works fine in other browser but in it its throw the following error.

Microsoft JScript runtime error: 'null' is null or not an object

My code snippet is as below.

  GDownloadUrl("<?php echo $cfg->webroot;?>/G-map/map_xml/<?php echo $_SESSION['xml_file_name'];?>", function(data) {
              var xml = GXml.parse(data);
              var markers = xml.documentElement.getElementsByTagName("marker");

             for (var i = 1; i <=markers.length; i++) 
             {  

                /// Error produce here just for IE  

                    var type=markers[i].getAttribute("type");
                     var name =markers[i].getAttribute("title");

                     var address =markers[i].getAttribute("address");
        //           var link= '<a href="doc_detail/doc_detail-'+ markers[i].getAttribute('id')+'.html" class="doc_url">Read More</a>';
                     var point = new GLatLng(parseFloat(markers[i].getAttribute("latitude")),
                     parseFloat(markers[i].getAttribute("longitude")));

                     var marker = createMarker(point, name, address, type);
                     map.addOverlay(marker);
             }

Thanks in advance

Greg · Accepted Answer · 2009-07-31 13:13:40Z

1

Your loop is using a 1-based array: I'd be surprised if this was correct...

Try this instead:

for (var i = 0; i < markers.length; i++)

answered Jul 31, 2009 at 13:13

Greg

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6 Comments

Avinash Over a year ago

thanks a lot, its works for me, can you please explain whats the problem actually?

coderjoe Over a year ago

Arrays in javascript are 0 based. This means that an array with 5 elements (length 5) has elements 0 through 4. Not 1 through 5. This means your condition was an "off by one" error.

Greg Over a year ago

Yup, there's not really anything to add to @coderjoe's explanation

Avinash Over a year ago

Hi Greg, above code is my xml file read code using google api. It works fine in all browser, but in ie7 and ie8 it create a problem with reading xml file, Actually my xml file is updating on certain event and after that event this xml file is read through ajax and data will be displayed in map. Here xml file is updating very fine, but in ie7 an ie8, every time ajax gives the very first response. Means its not reading the latest xml file. Can you please explain what can be the problem, particular for ie7, and ie8..

Greg Over a year ago

It sounds like the XML is being cached - add a random number to the URL - for example if you have "google.com/foo.xml" make it "google.com/foo.xml?rnd=" + Math.random()

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