XML AS3选择图像URL命名空间值 [英] XML AS3 Selecting Image URL Namespace value

问题描述

基本上，对于一个项目，我正在使用XML提供的一个漫画阅读器。在deviantart上的漫画。我只是想了解如何提取项目对象中的图像的网址，我想我主要是在学习语法应该如何努力。我试过了： var imgUrl：String = comicXML.children（）。content。@ url; 与comicXML是url请求。跟踪单独的comicXML是否正常工作，并返回XML。

也许有人可以给我一两个提示？

这是一个棘手的问题，部分原因是因为挂起并不是处理命名空间的基本XML处理。您会在< item> 中注意到，有一个标记< media：content url =blahblahblah/> $ b $ media：make content 媒体命名空间的一部分，它允许我们有两个同名的标记作为父标记的一部分，而不会与其他命名空间中同名的标记冲突。您可以看到< item> 同时包含< title> 和< ; media：title> 并且不会抱怨它。

您还会注意到，在根标记中有几个命名空间（媒体，原子和creativeCommons）：

 < rss xmlns：media =http：// search。 yahoo.com/mrss/
 xmlns：atom =http://www.w3.org/2005/Atom
 xmlns：creativeCommons =http://backend.userland.com/creativeCommonsRssModule 
 version =2.0> 
  

要使用它们，您需要创建一个Namespace变量：

  var myXML：XML = new XML（loader.data）; 
 var media：Namespace = myXML.namespace（media）; 
  

现在我们已经创建了代表xmlns：media的媒体，我们可以访问任何标签与媒体：这样的代码前缀（注意::双冒号）：

  trace（myXML.channel。 。项[0] .media :: @内容URL）; 
  

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我发现这些链接很有帮助第二个！）：

http://lab.revoke.ca/2009/05/as3-xml-namespace/

Basically, for a project I am making a comic reader in flash with XML provided by a comic strip on deviantart. I'm only so far trying to figure out how to extract the url of an image within an item object, I think I'm mostly struggling with learning how the syntax is supposed to be. I've tried: var imgUrl:String = comicXML.children().content.@url; with comicXML being the url request. Tracing comicXML alone Does work correctly and gives back the XML.

Maybe someone can give me a hint or two?

解决方案

This is a tricky one, partly because the hangup isn't so much basic XML processing as it is dealing with namespaces. You'll notice within your <item>, there is a tag <media:content url="blahblahblah" />

That "media:" makes content part of the media namespace, and it allows us to have two tags with the same name be part of a parent tag without conflicting with tags of the same name in other namespaces. You can see that <item> has both a <title> and a <media:title> and doesn't complain about it.

You'll also notice, in your root tag, there are several namespaces (media, atom, and creativeCommons) defined with xmlns:

<rss xmlns:media="http://search.yahoo.com/mrss/"
     xmlns:atom="http://www.w3.org/2005/Atom"
     xmlns:creativeCommons="http://backend.userland.com/creativeCommonsRssModule"
     version="2.0">

To use them, you'll need to create a Namespace variable:

var myXML:XML = new XML( loader.data );
var media:Namespace = myXML.namespace("media");

Now that we've created media, which represents the xmlns:media, we can access any of the tags with the media: prefix with code like this (notice the :: double-colon):

trace(myXML.channel.item[0].media::content.@url);

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I found these links to be helpful (especially the second one!):

http://lab.revoke.ca/2009/05/as3-xml-namespace/

http://coursesweb.net/actionscript/xml-e4x-namespaces

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