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HOW TO: Delete an XML node using E4X

While creating a sample application for some class content the other day, I ran into an XML/E4X situation that I'd never encountered before. It is pretty basic - deleting a node from XML. How does one do it? With the delete keyword of course!

For example:

Man, E4X is so simple!

download: Delete Node Example (4.78KB) added: 04/09/2009 clicks: 113 description: Code source (.FLA) for delete XML node using E4X in ActionScript 3 sample

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E4X XML Namespaces

For XML that looks like the following response from Yahoo's weather service:

When you need to access the nodes with complex node names such as yweather:location think XML namespaces.
In the above example, look for the xmlns declaration in the rss node
- xmlns:yweather='http://xml.weather.yahoo.com/ns/rss/1.0'.
Creating a Namespace object using the declaration will allow us to access the nodes with complex names.
Creating a Namespace object is a pretty simple process:

Now we can access the node with the following code:

With the preceding example we need to know the namespace url ahead of time. E4X gives us the namespaceDeclarations() method that will return an array that contains the namespace declarations associated with the XML document

Using the namespaceDeclarations() method from the XML object:

Now we have an array of namespace declarations that we can use to dynamically declare Namespace objects and access our complex node names:

So we can access the geo and yweather nodes without any problems now.

Posted in actionscript, e4x, flex, xml | Comments