E4x expressions all return a valid XMLList object.
So xml.a, if it exists will have a non-zero length() (I can never
remember which length is a method and which is a property, so verify
that).
If it does not exist, then xml.a.length() == 0.
Relatedly, the syntax [EMAIL PROTECTED] will error if attrName is not an
attribute for all nodes being parsed. The expression
xml.attribute("attrName") will not error if the attribute is missing,
since it returns an XMLList. Treating that XMLList as text, it appears
as an empty string. Not quite sure how that works.
Tracy
-----Original Message-----
From: [email protected] [mailto:[EMAIL PROTECTED] On
Behalf Of Tom Chiverton
Sent: Thursday, November 29, 2007 6:12 AM
To: [email protected]
Subject: Re: [flexcoders] Re: How use hasOwnProperty() in combination
with namespace
On Thursday 29 Nov 2007, hannes.stockner wrote:
> Would you be so kind as to explain me the solution by my example.
Firstly, bookmark http://www.linkwerk.com/pub/javascript/e4x/e4x-tester/
as it
lets you play with E4X expressions easily.
> I want to check if the property <a> exists.
Ignoring the namespace, the expression you want is just "xml.a" - either
you'll get back the node, or nothing.
--
Tom Chiverton
Helping to dynamically entrench ubiquitous designs
on: http://thefalken.livejournal.com
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