XMLListCollection子元素的Flex排序 [英] Flex sorting of XMLListCollection subelements

问题描述

在Flex web应用程序中，是否有一种简单的方法来根据子元素的属性对XML元素的子元素应用排序？示例如下：

In a Flex webapp, is there an easy way to go about applying a sort to the children of an XML element, based on the children's attributes? Example follows below:

XMLListCollection：

XMLListCollection:

; a anotherProp =ABCDE>

   < e prop =AB> 1< / element> / code>

   < e prop =BC> 2< / element>

< / a>

< a anotherProp =FGEH>

   < e prop =HF> 3< / element>

   < e prop =AD> 4< / element>

  < e prop =AC> 5< / element>

< / a> br />

<a anotherProp="ABCDE">
  <e prop="AB">1</element>
  <e prop="BC">2</element>
</a>
<a anotherProp="FGEH">
  <e prop="HF">3</element>
  <e prop="AD">4</element>
  <e prop="AC">5</element>
</a>

我想对< e> 元素，在每个< a> 元素中，根据他们的prop属性。生成包含< a> 元素的数组的代码如下：

I would like to sort the <e> elements, within each <a> element separately, according to their "prop" attribute. My code for generating the array containing the <a> elements is along the lines of:

for each(var node:XML in initialInput:XMLListCollection){
  if(node.localName()=="a"){
    //I was hoping to be able to sort the <e> children of the node variable here
    xmlListCollectionVar.addItem(node);
  }
}

结尾我想要< a> 以保持其定义的顺序，但是他们的< e> 属性。到目前为止，如果我尝试：

At the end I would like the <a>'s to remain in their defined order, but their <e> children to be sorted based on the "prop" attribute. So far if I try:

node.children（）。sort = someSortVar

node.children().sort=someSortVar

其中someSortVar的字段设置为：

where someSortVar has its fields set to:

SortFields（e。@ prop，。 ..）

SortFields("e.@prop",...)

我得到一个空值的异常。任何方式将儿童列表转换为XMLListCollection，排序它，并将其集成回节点变量？感谢任何回复。

I get an exception about a null value. Any way to convert the children list to XMLListCollection, sort it and integrate it back into the node variable? Thanks for any replies.

推荐答案

我想出了两个解决方案：第一个涉及将XMLList转换为数组， array：

I came up with two solutions: The first involved converting an XMLList to an array and sorting on the array:

  for each (var a:XML in elt..a)
  {
    var children:Array = toArray(a.children());
    children.sortOn("@prop");
    a.setChildren(new XMLList());
    for each (var c:XML in children)
    {
      a.appendChild(c);
    }
  }

第二个涉及使用< c $ c> XMLListCollection ，虽然我相信< a>子项是 XMLList ，而不是 XMLListCollection ：

The second involved using the sort attribute of an XMLListCollection, although I believe that the <a> children are an XMLList, not an XMLListCollection:

  var sort:Sort = new Sort()
  sort.fields = [new SortField("@prop")];
  for each (var a:XML in xml..a)
  {
    var xcoll:XMLListCollection = new XMLListCollection(a.children());
    xcoll.sort = sort;
    xcoll.refresh();
    a.setChildren(xcoll.copy());
  }

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