My event.result may or may not return a node in the xml file. How can I avoid that TypeError: Error #1009:
My event.result may or may not return a node in the xml file. How can I avoid that TypeError: Error #1009: cannot access a property or method of a null object reference.
I have a very simple question. I want to take the value of
Event.Result.Item.nodeindex1.nodeindex2.Row.MyValue;
and assign it to a text field
mytextTi.text = event.result.item.nodeindex1.nodeindex2.row.myvalue;
But if a part of the tree is missing, which is also valid, so I get TypeError: Error #1009: cannot access a property or method of a null object reference.
I tried various solutions such as the following. Is there any simple way to do this?
If (event.result.item.nodeindex1.nodeindex2.row.myvalue! = undefined)-does not work
Unfortunately, one must test all levels to ensure that it is not null before the reference to it. You can take advantage of the short-circuit evaluation in tying together, for example
if (event.result.item && event.result.item.nodeindex1 && event.result.item.nodeindex1.nodeindex2 && event.result.item.nodeindex1.nodeindex2.row && event.result.item.nodeindex1.nodeindex2.row.myvalue) { // access the variable } else { // one of the XML nodes in the path is null }
Or you could stay away from her a little hacky and wrap the reference in a try/catch block.
-Tom
Flex SDK engineer
Tags: Flex
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