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

问题描述

在 Flex webapp 中，是否有一种简单的方法可以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:

  <e prop="AB">1</element>
  <e prop="BC">2</element>


  <e prop="HF">3</element>
  <e prop="AD">4</element>
  <e prop="AC">5</element>

<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 元素进行排序，在每个 元素中，根据它们的prop"属性分别进行排序.我生成包含 <a> 元素的数组的代码是这样的:

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);
  }
}

最后，我希望 保持其定义的顺序，但他们的 子项根据道具"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

someSortVar 的字段设置为:

where someSortVar has its fields set to:

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

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

我收到一个关于空值的异常.有什么方法可以将子列表转换为 XMLListCollection，对其进行排序并将其集成回节点变量中?感谢您的回复.

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 转换为数组并在数组上排序:

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 XMLListCollection 的 sort 属性，尽管我相信 <a>孩子是一个 XMLList，而不是一个 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());
  }

这篇关于XMLListCollection 子元素的 Flex 排序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！