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When I change private var myVar:Object; to public var myVar:Object; the alert doesn't come up, as expected. Changing it to protected
doesn't fix it. So apparently "in" only works on public --
not private or protected -- things, which I didn't know. I'll ask our AS3
designers whether that's the intended behavior. - Gordon -----Original Message----- hi Gordon, one question please. how come the following code passes the if test even though myVar clearly exists? private var myVar:Object; private function test():void { myVar = new Object(); if(!("myVar" in this)) { Alert.show("passes"); } } thanks bod --- In wrote: > > if ("idName" in this) > > - Gordon > > -----Original Message----- > From: [mailto: > Behalf Of alpharythms > Sent: Wednesday, April 05, 2006 3:19 PM > To: > Subject: [flexcoders] Testing if a variable exist? > > I imagine this is something simple that I am missing but is there
a > way to test a variable to see if it exist. > > Specifically I have several components with IDs. So I can
access them > like this.idName or this["idName"]. > > I need to way to know if this["idName"] is a valid
variable. I've > tried if(this[idName]==null) or undefined. The trouble is I
get a > runtime error as soon a this[idName] that doesn't exist comes up. > > Here is what I'm try do to. I've loading an XML document and
then > looping through the attributes in a node. If a > this[currentAttributeName] component exist then I bind it to the data > in the XML. If I come across an attribute that doesn't exist
on the > Flex form than I just want to ignore it. > > Everything works great until I hit an attribute that doesn't exist. > So I just need a way to test for the existance of a component with
the > given ID name. > > Thanks, > Adam > > > > > > > > -- > Flexcoders Mailing List > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > Search Archives: > http://www.mail-archive.com/flexcoders%40yahoogroups.com > Yahoo! Groups Links > -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives:
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- RE: [flexcoders] Re: Testing if a variable exist? Gordon Smith
