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photography by Kristel van Beek
27 Sep: Testing the existance of an attribute in XML with AS3
posted by: martijn, at 27 September 2007 11:46 GMT+1, 7 January 2008 22:03 GMT+1
I had the need to test the existance of an attribute in a XML node. Searching the internet didn't resolve much and tracing a non existing attribute gave me no resulttrace(node.@test)Testing the result as a string wouldn't help because the attribute is of the type XML.
My solution is not elegant but it works (I'm hoping someone can tell me a better solution).
if ( node.@test != node.@nonexistingattribute ) {
// attribute exists
}As you can see I compare the attribute with an attribute I definitely know is not present.
Update: The technique given by Mathis is working like a charm, thanks!
Update 2: My apologise, the method Mathis has given doesn't work. The one I found working is:
if ("@attr" in node) { ... }
Thanks Valery Silaev
9 Comments
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Martijn, thanks for this post. Even a month later this is the only post I could google about the topic! I found the solution Robert gave looks somewhat "cleaner" in code, without the quotes of the if ("@attr" in node) ... But the jury is still out on the best way.
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Robert Penner says:
at 27 September, 2007 22:42 robertpenner.comYet another way is
if (node.@attr.length()) -
Andres Santos Flex says:
at 27 September, 2007 20:59 www.asb-labs.com/blogHey hi Martijn, yep i had that problem as well i used this fancy strategy but as you said it works!
if(node.@atribute.toString().length>0){
//code
}
not the best solution but it is working on my mxml decompiler (posted on my blog) www.asb-labs.com/blog -
Valery Silaev says:
at 27 September, 2007 15:10 flexblog.faratasystems.comThis might work:
if ("@attr" in node) {
...
} -
mathis says:
at 27 September, 2007 14:01 mathis.komplex3.dewhat about this fairly simply strategy:
if ( node.hasOwnProperty('@test')){
// attribute qtest exists
} -
What? says:
at 27 September, 2007 13:50How about
if (node.@attr==undefined) { doesn't exist } -
Haungo says:
at 8 March, 2008 20:42 haungo.netI'm very glad I found this page... The following worked perfectly for me:if (node.@attr==undefined) { doesn't exist }Thanks! -
starpause says:
at 21 April, 2008 23:08 starpause.com/i'm with haungo, testing the @attribute against undefined does the trick! -
Neil says:
at 8 October, 2008 13:20I use the hasOwnProperty() method to check it exists, eg; hasOwnProperty("@type") this.content_xml.item.(hasOwnProperty("@type") && @type=="group"); will give me all items that actually have type and are of type group. Neil
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at 4 December, 2007 11:12 www.lostboys.nl