How can I parse my xml in Flex? - actionscript-3

Question

I have the following XML structure:
<Order>
<Mats>
<mat>
<item>
<imgsrc>img_0</imgsrc>
<cid>cid_0</cid>
</item>
</mat>
<mat>
<item>
<imgsrc>img_1</imgsrc>
<cid>cid_1</cid>
</item>
</mat>
</Mats>
</Order>
In Flex, I am trying to get the first imgsrc and first cid. This is what I have so far:
public function globals_get_default_matte():void
{
var defaults_matte_loader:XMLLoader = new XMLLoader();
defaults_matte_loader.url = Globals.defaultMatteXMLURL;
defaults_matte_loader.loadXML();
defaults_matte_loader.addEventListener("dataWritten",globals_get_default_matte_result_handler);
}
public function globals_get_default_matte_result_handler(e:Event):void
{
var _xml:XML = new XML(e.currentTarget.data);
if (_xml)
{
var mattes_list:XMLList = _xml.elements("Mats");
var matte0:XML = mattes_list[0][0][0] as XML;
trace(mattes_list);
trace(matte0);
trace(matte0.childNodes);
}
}
In the Expressions tab, matte0.childNodes gives:
errors during evaluation

Answer 1

This is not doing what you want:
var mattes_list:XMLList = _xml.elements("Mats");
var matte0:XML = mattes_list[0][0][0] as XML;
mattes_list lists the <Mats> node, then matte0 does nothing more than select the first (and only) <Mats> node. Meanwhile, childNodes is not a property of XML, but the legacy XMLNode object, which you aren't using.
You should familiarize yourself with e4x in AS3. It's more like a query selector syntax.
To list the <mat> nodes and retrieve the first <cid> node, you can do this:
var mattes_list:XMLList = _xml.Mats.mat;
var matte0_cid:XML = mattes_list[0].item.cid[0];