Thread: Web service returning XML string

I have a. ASP.Net web service that is being called by a JS function that I want to return XML formatted code which is then used to populate a dropdown list.

I originally tried returning an object of type XMLWriter, but that didn't seem to work, so I just tried using a stringbuilder to create an xml structure to return to my JS complete function.

The XML I am returning is

Code:

<catlist>
   <category>
      <ref>1</ref>
      <name>Item 1</name>
   </category>
</catlist>

In my JS function I am trying this, but am getting an error

Code:

function OnChangeComplete(result){
var catlist = result.getElementsByTagName('category');
 if(catlist!=null){
   var subcat = document.getElementById('ctl00_ddlsubcategory');
   var opt = document.createElement('option');
   for(var i=0;i<subcat.length;i++){
      subcat.options[i].remove();
   }
   for(var x=0;x<catlist.childNodes.length;x++) {
      opt.value = catlist[x].childNodes[0].nodeValue;
      opt.text = catlist[x].childNodes[1].nodeValue;
      subcat.options.add(opt,null);
   }
 }
}

The error is result.getElementsByTagName is not a function.

As far as I know this is a valid JS function to use on an XML document. See here.

Is it because I am returning a string to the JS function? How can I go about returning correct XML that can be processed by JS?

OK. I seem to have fixed that issue by loading it as an xml document, but it's just adding blank options to the other dropdown.

Any ideas?

OK. Seem to have sorted it.

Needed to use:-

Code:

catlist[x].childNodes[0].childNodes[0].nodeValue