CODEWITHSUNDEEP
apache-flex
kushi
kushi

Reputation: 389

Flex-Sorting on ArrayCollection

I have an ArrayCollection(neList) of Objects(neObj). Each neObj has several fields like ipAddress,TID,etc.. In most cases neObj will be have values of both TID and ipAddress, rarely it will not have TID but have ipAddress... After adding Objects(neObj), I need to sort the ArrayCollection whose behaviour must be similar to array.sort() which has got strings only..(i.e nos first followed by strings in alphabetical order)

Things I have tried: 1)Using neList.source.sort() and neList.refresh.. but it did not work as neList.source has objects not straight forward things like strings 2)I think i cannot use sortOn function of ArrayCollection as it can be done on only 1 field

My Requirement: Use Case1:- Objects in ArrayCollection have both TID and IP neObj1.TID="RAPC" neObj1.ipAddress="121.1.1.2"; neObj2.TID="RAPA" neObj2.ipAddress="121.1.1.1" O/P after sorting should be neObj2 neObj1

Use Case2:- 1 of the objects does not have TID neObj1.ipAddress="121.1.1.2"; neObj2.TID="RAPA" neObj2.ipAddress="121.1.1.1" O/P after sorting should be neObj1 neObj2

Upvotes: 0

Views: 228

Answers (1)

Christophe Herreman
Christophe Herreman

Reputation: 16085

As hinted in the comments, you'll need to use a sort compareFunction to decide how the items will be sorted.

I do like to point out that sorting a combination of letters and numbers is tricky in the sense that there is no natural order by default. e.g. when sorting, 1, 2 and 11, the order will be 1, 11, 2. You can however solve this using the naturalCompare method in the AS3Commons Lang project.

Here's a code sample for your case. The sort is implemented as a subclass of the Sort class so that you can easily reuse it in other collections:

package {

import mx.collections.Sort;

import org.as3commons.lang.StringUtils;

public class NaturalSort extends Sort {

  public function NaturalSort() {
    compareFunction = function (a:Object, b:Object, fields:Array = null):int {
      var stringA:String = (("TID" in a) ? a.TID : "AAAA") + a.ipAddress;
      var stringB:String = (("TID" in b) ? b.TID : "AAAA") + b.ipAddress;
      return StringUtils.naturalCompare(stringA, stringB);
    };
  }
}
}

To apply this:

var collection:ArrayCollection;
collection.sort = new NaturalSort();
collection.refresh();

Upvotes: 0

Related Questions