Re: text to XML object (E4X)

hluz wrote:


> I'm having a problem with creating a XML object from a document received 
> via XMLHTTPRequest.
> The following code:
> 
> var x = new XML(responseText)
> 
> gives javascript error: xml is a reserved identifier.
> If I remove the <?xml version="1.0"?> line from responseText before 
> using it, it works fine.

It is by design as the authors of the E4X specification wanted it, the 
specification for
   new XML(string)
says to do the following (13.4.2):
   Let x = ToXML(string)
and ToXML(string) is specified as follows (10.3.1):
   Parse the concatenation of
   <parent xmlns=", defaultNamespace, ">", string, "</parent>"
So that way a conforming implementation has to parse e.g.
   <parent xmlns=""><?xml version="1.0"?><root /></parent>
and that is not well-formed and gives a parse error.
Thus if you want to parse a string with XML markup make sure you throw 
the XML declaration away before passing the string to new XML().

A regular expression to match the XML declaration is e.g.
   var xmlDeclaration = /^<\?xml version[^>]+?>/;
so you could try removing it e.g.
   new XML(responseText.replace(xmlDeclaration, ''))

-- 

	Martin Honnen
	http://JavaScript.FAQTs.com/