Flex中利用SortField和Sort类对ArrayCollection进行排序的例子

<?xml version="1.0" encoding="utf-8"?>

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"

xmlns:s="library://ns.adobe.com/flex/spark"

xmlns:mx="library://ns.adobe.com/flex/mx"

backgroundColor="white"

creationComplete="init()">

<fx:Script>

<![CDATA[

import mx.collections.SortField;

import mx.collections.Sort;

import mx.collections.ArrayCollection;

[Bindable]

private var arrColl:ArrayCollection;

/** This method gets called by the main mx:Application tag and initializes/populates the ArrayCollection object with a bunch of random numbers. */

private function init():void

{

var i:int;

/* Initialize and populate the ArrayCollection object. */

arrColl=new ArrayCollection();

for (i=0; i < 20; i++)

{

arrColl.addItem({data: getRandomNumber().toFixed(4)});

}

}

/** This method returns a random floating-point number between 0 and 10000. */

private function getRandomNumber():Number

{

return Math.random() * 10000;

}

/** This method gets called by the Button control's click handler and creates a new SortField and Sort object which are used to sort the ArrayCollection. */

private function button_click():void

{

/* Create the SortField object for

the "data" field in the ArrayCollection

object, and make sure we do a numeric sort.

*/

var dataSortField:SortField=new SortField();

dataSortField.name="data";

dataSortField.numeric=true;

/* Create the Sort object and add the

SortField object created earlier to the

array of fields to sort on. */

var numericDataSort:Sort=new Sort();

numericDataSort.fields=[dataSortField];

/* Set the ArrayCollection object's

sort property to our custom sort,

and refresh the ArrayCollection. */

arrColl.sort=numericDataSort;

arrColl.refresh();

}

]]>

</fx:Script>

<mx:List id="list"

dataProvider="{arrColl}"

textAlign="right"

labelField="data"

width="300"/>

<mx:Button id="button"

x = "200" y="400"

label="sort items"

click="button_click()"/>

</s:Application>