在Flex中排序ArrayCollection

问题描述

我有一个类似CriticalHigh的数据提供者Medium 低
在哪里我需要排序的方式，我需要关键将显示在上面和下一个高，中，低如下。

谢谢，
Kumar

解决ArrayCollection 是 ListCollectionView 的一个子类，它有一个 sort 。 Sort 类有一个 compareFunction 来定义自定义排序功能。

<$ p $ （

$ b //假设'level'是变量的名字在每个对象
//中保存Critical，High等值
var levels：Array = [Low，Medium，High，Critical];
var aLevel：Number = levels.indexOf（a.level）;
var bLevel：Number = levels.indexOf（b.level）;
if（aLevel == -1 || bLevel == -1）
throw new错误（Critical value for criticality）;
if（aLevel == bLevel）
return 0;
if（aLevel> bLevel）
return 1;
返回-1;

var sort：Sort = new Sort（）;
sort.compareFunction = sortFunction;
arrayCollection.sort = sort;
arrayCollection.refresh（）;

Is there any way in Flex where in we can sort an arraycollection based on strings .

I have a dataprovider with strings like "Critical" "High" "Medium" "Low" where in I need to sort it in such a way that I need Critical to be displayed on the top and next High , Medium and Low follows.

Can somebody let me know any logic .

Thanks,Kumar

解决方案

ArrayCollection is a subclass of ListCollectionView that has a sort property. The Sort class has a compareFunction property that you can use to define custom sort functions.

private function sortFunction(a:Object, b:Object, array:Array = null):int
{
   //assuming that 'level' is the name of the variable in each object
   //that holds values like "Critical", "High" etc
   var levels:Array = ["Low", "Medium", "High", "Critical"];
   var aLevel:Number = levels.indexOf(a.level);
   var bLevel:Number = levels.indexOf(b.level);
   if(aLevel == -1 || bLevel == -1)
      throw new Error("Invalid value for criticality ");
   if(aLevel == bLevel)
      return 0;
   if(aLevel > bLevel)
      return 1;
   return -1;
}
var sort:Sort = new Sort();
sort.compareFunction = sortFunction;
arrayCollection.sort = sort;
arrayCollection.refresh();

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