Re: [Flashcoders] Variables in E4X ?

Glen Pike Mon, 15 Mar 2010 14:20:36 -0700

Hi,

   You can use:


   var myNode:String = "background";
   var myAttr:String = "url";

   var foo:XML = customXML.config.child(myNode).attribute(myAttr);

Or similar. You should possibly handle exceptions - e.g. if configdoes not have any background nodes, that will go pear shaped, etc.


   e.g.

var foo:XMLList = customXML.config.child(myNode);

   if(0 == foo.length()) {
      trace("no XML nodes with type '" + myNode + "'");
      return;
   }
   var bar:XMLList = foo[0].attribute(myAttr);
   if(0 == bar.length()) {
      trace("no XML nodes with attr '" + myAttr + "'");
      return;
   }

trace("found " + bar.length() + " nodes of " + myNode + " with attr" + myAttr " + bar.toXMLString());Have a play with some of the tools online:http://www.linkwerk.com/pub/javascript/e4x/e4x-tester/


   Works quite nicely and seems to support most "queries".

http://blog.betabong.com/2008/09/23/e4x-string-parser/Only supports parsing some e4x "queries", but is okay for testingbasic stuff.

I keep turning to this article, which is really helpful for e4xstuff time-and-time again:


   http://dispatchevent.org/roger/as3-e4x-rundown/

   These might be helpful for info about "filtering" e4x:

http://joshblog.net/2007/05/17/filter-xml-data-with-e4x-in-flash-part-2/

   http://joshblog.net/2007/06/29/getting-advanced-with-e4x/

http://keith-hair.net/blog/2008/05/31/using-e4x-with-xml-in-as3/

HTH

Glen

http://www.google.co.uk/search?hl=en&client=firefox-a&hs=aWx&rls=org.mozilla%3Aen-US%3Aofficial&channel=s&q=as3+e4x+filtering+comparison&meta=&aq=f&aqi=&aql=&oq=


Steven Loe wrote:

In E4X we use dot notation to access a node in an XML:


var foo = customxml.config.backgrou...@url

Is it possible to substitute variables in portions of the path above? Something 
like this:

var myNode = "background";
var myAttr = @url;

var foo = customXML.config.[myNode].[myAttr];

Possible?

Thanks very much

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--

Glen Pike
01326 218440
www.glenpike.co.uk <http://www.glenpike.co.uk>

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Re: [Flashcoders] Variables in E4X ?

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