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27 Sep: Testing the existance of an attribute in XML with AS3
posted by: martijn, at 27 September 2007 11:46 GMT+1, 13 August 2009 23:28 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 resultWrite a comment for this articletrace(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
12 Comments
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Eric-Paul says:
at 4 December, 2007 11:12 www.lostboys.nlMartijn, 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. -
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 -
Fridasongs says:
at 30 March, 2009 13:31I was very frustated withthis issue after migrating from as2 to as3.Thanks for the help.This works fine (as pointed out by Whats?) :if (node.@attr==undefined) { doesn't exist }Wanted to point out it also works in checking for child nodes.if (node.childnode==undefined) { doesn't exist } -
bLb says:
at 15 May, 2009 6:36if(node.attribute("attr")) { // attribute exists } works like a charm :-)BTW, to change the attribute with this method: node.attribute("attr")[0] = "new value" ;I searched 3 hours to find that last one out :-) -
cafeine says:
at 13 November, 2009 14:18 www.cncstudios.grvery helpful....works like a charm!
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