xml 如何通过flex / actionscript中的属性名称/值查找特定的xml数据
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how to find specific xml data by attribute name/value in flex / actionscript
提问by Scott Szretter
From some xml I want to find items that have a specific attribute and value.
从一些 xml 我想找到具有特定属性和值的项目。
Here is example xml:
这是示例xml：
<node>
<node>
<node>
<special NAME="thisone"></special>
</node>
<node>
<special>dont want this one</special>
</node>
</node>
</node>
(nodes can contain nodes...)
（节点可以包含节点...）
I need to find the first based on it has an attribute named "NAME" and value of "thisone".
我需要根据它找到第一个具有名为“NAME”的属性和“thisone”的值。
then I need its parent (node).
然后我需要它的父节点（节点）。
I tried this:
我试过这个：
specialItems = tempXML.*.(hasOwnProperty("NAME"));
specialItems = tempXML.*.(hasOwnProperty("NAME"));
but didnt seem to do anything.
但似乎没有做任何事情。
??
??
Thanks!
谢谢！
回答by Michael Brewer-Davis
In ActionScript you'll use E4X rather than XPath, generally. What you want can be achieved like this:
在 ActionScript 中，您通常会使用 E4X 而不是 XPath。你想要的可以这样实现：
var xml:XML = <node>...</node>;
var selected:XMLList = xml.descendants().(attribute("NAME") == "thisone");
var first:XML = selected[0];
var parent:XML = first.parent();
If you know the node you want is a special, then you can use:
如果你知道你想要的节点是 a special，那么你可以使用：
var selected:XMLList = xml..special.(attribute("NAME") == "thisone");
instead. Here's a nice E4X tutorial.
反而。这是一个不错的 E4X 教程。
If you use the @NAME == "thisone"syntax, then you do need the NAME attribute on all of your XML nodes, but not if you use the attribute()operator syntax instead.
如果您使用该@NAME == "thisone"语法，那么您确实需要所有 XML 节点上的 NAME 属性，但如果您改用attribute()运算符语法则不需要。
I added the parent()call above; you could get the parent directly by using the child only in the conditional:
我在parent()上面添加了调用；您可以通过仅在条件中使用孩子来直接获得父母：
xml..node.(child("special").attribute("NAME") == "thisone");
回答by George Profenza
You could do this in 2 ways:
你可以通过两种方式做到这一点：
- add the NAME attribute to all your special nodes, so you can use an E4X conditions(xml)
- use a loop to go through special nodes and check if there is actually a NAME attribute(xml2)
- 将 NAME 属性添加到所有特殊节点，以便您可以使用 E4X 条件（xml）
- 使用循环遍历特殊节点并检查是否确实存在 NAME 属性（xml2）
Here is an example:
下面是一个例子：
//xml with all special nodes having NAME attribute
var xml:XML = <node>
<node>
<node>
<special NAME="thisone"></special>
</node>
<node>
<special NAME="something else">dont want this one</special>
</node>
</node>
</node>
//xml with some special nodes having NAME attribute
var xml2:XML = <node>
<node>
<node>
<special NAME="thisone"></special>
</node>
<node>
<special>dont want this one</special>
</node>
</node>
</node>
//WITH 4XL conditional
var filteredNodes:XMLList = xml.node.node.special.(@NAME == 'thisone');
trace("E4X conditional: " + filteredNodes.toXMLString());//carefull, it traces 1 xml, not a list, because there only 1 result,otherwise should return
//getting the parent of the matching special node(s)
for each(var filteredNode:XML in filteredNodes)
trace('special node\'s parent is: \n|XML BEGIN|' + filteredNode.parent()+'\n|XML END|');
//WITHOUGH E4X conditional
for each(var special:XML in xml2.node.node.*){
if([email protected]()){
if(special.@NAME == 'thisone') trace('for each loop: ' + special.toXMLString() + ' \n parent is: \n|XML BEGIN|\n' + special.parent()+'\n|XML END|');
}
}
There is a pretty good and easy to follow article on E4X on the yahoo flash developer page.
在yahoo flash developer page上有一篇关于 E4X 的很好且易于理解的文章。
