Flex中Array和ArrayCollection排序

Flex中Array和ArrayCollection排序

Array排序

protected function applicationCompleteHandler(event:FlexEvent): void
{
    var array:Array = [];
    array.push( new Vga("a",10));
    array.push( new Vga("c",2));
    array.push( new Vga("f",1.3));
    array.push( new Vga("d",1.1));
    array.push( new Vga("e",16));
    array.push( new Vga("b",0));
    trace(array.toString());
     // output:   [a,10],[c,2],[f,1.3],[d,1.1],[e,16],[b,0]
    var defaultSort:Array = array.sort(); // 默认排序
    trace(defaultSort.toString());
     // output:   [a,10],[b,0],[c,2],[d,1.1],[e,16],[f,1.3]
    var sortFunArray:Array = array.sort(sortFun); // 使用自定义方法排序
    trace(sortFunArray.toString());
     // output:   [b,0],[d,1.1],[f,1.3],[c,2],[a,10],[e,16]
}

/** 自定义排序方法 */            
public function sortFun(a:Vga,b:Vga): int{
     if(a.price < b.price){
     return -1;  // a在前,b在后
    } else  if(a.price == b.price){
     return 0;  // ab位置不变
    } else{
     return 1;  // b在前,a在后
    }
}



/** 排序VO对象 */
public  class Vga
{
     public var name:String;
     public var price:Number;
    
     public function Vga(name:String,price:Number)
    {
     this.name = name;
     this.price = price;
    }
        
     public function toString():String{
     return "["+ this.name+","+ this.price+"]";
    }
}

ArrayCollection排序

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
    <mx:Script>
        <![CDATA[
             import mx.collections.SortField;
             import mx.collections.Sort;
             import mx.collections.ArrayCollection;
             private var acSort:ArrayCollection=
             new ArrayCollection([{id:0,userName:"zhangSan",age:21},
                                {id:2,userName:"liSi",age:24},
                                {id:1,userName:"wangWu",age:31}]);
            
            
             private function sortAc():ArrayCollection{
                var sort:Sort= new Sort();
                 // 按照ID升序排序
                sort.fields=[ new SortField("id")];
                
                 // 按照userName降序排序
                sort.fields=[ new SortField("userName", true, true)];
                
                 // 先按ID升序,再按userName降序
                sort.fields[ new SortField("id"), new SortField("userName", true, true)];
                acSort.sort=sort;
                acSort.refresh(); // 更新
                 return acSort;
            }
            
             /*
            其实看看API就一目了然
            SortField () 构造函数 

            public function SortField(name:String = null, 
                        caseInsensitive:Boolean = false, 
                        descending:Boolean = false, 
                        numeric:Object = null)
                                    
            参数  
            name:String (default = null) — 此字段用来进行比较的属性的名称。如果该对象为简单类型，则传递 null。 
            caseInsensitive:Boolean (default = false) — 在对字符串进行排序时，指示比较运算符是否忽略值的大小写。
            descending:Boolean (default = false) — 指示比较运算符是否按降序排列项目。  
                 
            numeric:Object (default = null) — 指示比较运算符是否按编号而不按字母顺序比较排序项目。 
             */            
        ]]>
    </mx:Script>
</mx:Application>