See http://www.adobe.com/devnet/flex/articles/e4x_04.html
Michael Labriola uses a custom function he wrote to do what you want (download the zip file attached to the tutorial): E4XParser.evaluate( xml, string ) - that returns the evaluated xml.string where string is an e4x expression. What he uses it for is pretty cool too. Right now my application has a few datagrids with a bunch of label functions. I attacked the problem he used dynamic e4x to solve by instead using a function that returns a function, so even though my datagrids are controlled by label functions, they're unique and the runtime should be a ton better than this style of dynamic e4x evaluation. However, it is still interesting =) I'm curious about your requirement for dynamic e4x. Why do you need it? I'd like to see a good use of it. Seth From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of xhanin Sent: Thursday, January 17, 2008 2:49 AM To: [email protected] Subject: [flexcoders] Dynamic evaluation of E4X expression Hi, I find the E4X expression language very powerful, and would like to leverage it to find elements in an xml document. The problem is that I get the E4X expression at runtime, so I'm looking for a way to dynamically invoke the E4X expression. Something like: ------------------------------ var myXML:XML = <order> <item id='1'> <menuName>burger</menuName> <price>3.95</price> </item> <item id='2'> <menuName>fries</menuName> <price>1.45</price> </item> </order>; var expression:String = "item.(@id==2).menuName"; myXML.<something here?>(expression); ------------------------------ I first look for an eval function as in javascript, but found that AS3 does not provide such function any more. - Xavier
