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how to avoid the error due to missing element from an XML file in Flash Action Script

Answer 1

A:

if(xmlElement != null){

// do stuff here if it has a set value

}else{
// if it is empty then give it a value like this:

xmlElement = defultvalue;
}

bob 2010-04-22 18:13:47

I don't think the the null thing works, I think you need to check for undefined. or you can do what I do in my answer

invertedSpear 2010-04-22 18:26:48

ps, I wasn't the downvote.

invertedSpear 2010-04-22 18:29:09

the undefined and null are not working, you may please check by writting your own codes, I failed if conditions that is why am here :(

coderex 2010-04-22 18:35:20

@coderex, did you try using my other answer?

invertedSpear 2010-04-22 18:49:06

Answer 2

+1 A:

_setHeight = (xmlValue.setHeight.length() >0)?xmlValue.setHeight:0;

invertedSpear 2010-04-22 18:28:13

Answer 3

A:

When trying to access XML nodes that may not exist you should try using the child(), attribute() and element() functions from the XML class. Either of these returns an XMLList and if the specified node doesn't exist the XMLList is simply empty (with a length of 0) instead of the Flash Player immediately barfing up an Error.

From Flex Livedocs - Traversing XML structures :

If you try to filter on attributes or elements that may not exist, Flash® Player and Adobe® AIR™ will throw an exception. For example, the final line of the following code generates an error, because there is no id attribute in the second p element:
var doc:XML = 
 <body>
 Hello, Bob.
 Hello.
 </body>;
trace(doc.p.(@id == '123'));
Similarly, the final line of following code generates an error because there is no b property of the second p element:
var doc:XML = 
 <body>
 Hello, Bob.
 Hello.
 </body>;
trace(doc.p.(b == 'Bob'));
To avoid these errors, you can identify the properties that have the matching attributes or elements by using the attribute() and elements() methods, as in the following code:
var doc:XML = 
 <body>
 Hello, Bob.
 Hello.
 </body>;
trace(doc.p.(attribute('id') == '123'));
trace(doc.p.(elements('b') == 'Bob'));
You can also use the hasOwnProperty() method, as in the following code:
var doc:XML = 
 <body>
 Hello, Bob.
 Hello.
 </body>;
trace(doc.p.(hasOwnProperty('@id') && @id == '123'));
trace(doc.p.(hasOwnProperty('b') && b == 'Bob'));

Baelnorn 2010-04-22 20:19:15

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how to avoid the error due to missing element from an XML file in Flash Action Script

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