Understanding AS3 and XML

核心提示： This is one of the worst XML you can find because it has an unknown number of nodes (I don’t know how many levels has a level collection) and

This is one of the worst XML you can find because it has an unknown number of nodes (I don’t know how many levels has a level collection) and some nodes with multiple attributes.

But you’ll see parsing it with AS3 will be very easy anyway.

Let’s see how to read the xml file:

package　{
　import　flash.display.Sprite;
　import　flash.events.Event;
　import　flash.net.URLRequest;
　import　flash.net.URLLoader;
　public　class　sokoxml　extends　Sprite　{
　　public　function　sokoxml()　{
　　　var　loader:URLLoader=new　URLLoader;
　　　var　req:URLRequest=new　URLRequest("sokobanxml.xml");
　　　loader.addEventListener(Event.COMPLETE,on_xml_completed);
　　　loader.load(req);
　　}
　　public　function　on_xml_completed(event:Event):void　{
　　　var　xml_to_parse:XML=new　XML(event.target.data);
　　　trace(xml_to_parse)
　　}
　}
}

This would outputs the entire XML file in the same way it was created. Let’ see how does it work:

Lines 8-9: Setting the XML file to load

Line 10: Adding a listener to check if the XML has been completely loaded

Line 11: Loading the file

Line 14: Transforming the file in a XML variable. Not it’s ready to be parsed

The first things we want to look for in an XML file are elements. The elements method lists the elements of an XML object.