ArrayCollection操作实例

 

<?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/halo" minWidth="1024" minHeight="768">

<fx:Script>
   <![CDATA[
   
    import mx.collections.ArrayCollection;
   
    //添加对象
    public function insertCollection():void{
     //方法1
     //一个花括号代表一个对象
     var selectType01:String = "东京";
     var selectType02:String = "横滨";
     var oneArrayCollection:ArrayCollection = new ArrayCollection([{label:selectType01, data:1}, {label:selectType02, data:2}]);
    
     //方法2
     var twoArrayCollection:ArrayCollection;
     var array:Array = new Array();
     for(var i:Number = 0; i < 10; i++){
      array.unshift({city:"B" + i, data:i, size:1000 + i});
     }
     twoArrayCollection = new ArrayCollection(array);    //长度为10，也就是有10个对象
    
     //方法3
     var threeArrayCollection:ArrayCollection = new ArrayCollection();
     for(var j:Number = 0; j < 5; j++){    //添加5个对象
      threeArrayCollection.addItem({name:"C" + j, sequence:j, ok:"hello" + j});
     }
     trace(threeArrayCollection[2].ok);    //hello2
    
     //方法4，在指定的索引处添加对象
     threeArrayCollection.addItemAt({name:"K", sequence:"A", ok:"H"},2);
     trace(threeArrayCollection[2].ok);    //H
    
     //方法5，在制定的索引处添加对象
     threeArrayCollection.setItemAt({name:"W", sequence:"X", ok:"Q"}, 5);
     trace(threeArrayCollection[5].sequence);    //X
    }
   
    //删除对象，ArrayCollection相当于数组（数组集合）
    public function deleteCollection():void{
       var delCollection:ArrayCollection = new ArrayCollection();
     for(var j:Number = 0; j < 5; j++){    //添加5个对象
      delCollection.addItem({name:"DEL" + j, sequence:j, ok:"hello" + j});
     }
     for(var value:String in delCollection){
        trace(delCollection[value].ok);
     }
     delCollection.removeItemAt(2);    //删除第三个元素
     for(var value2:String in delCollection){
      trace(delCollection[value2].ok);
     }
     delCollection.removeAll();    //全部删除
     for(var value3:String in delCollection){
      trace("=========");
      trace(delCollection[value3].ok);
     }
    }
   
    //查询对象
    public function selectCollection():void{
     var twoArrayCollection:ArrayCollection;
     var array:Array = new Array();
     for(var i:Number = 0; i < 10; i++){
      array.unshift({city:"B" + i, data:i, size:1000 + i});
     }
     twoArrayCollection = new ArrayCollection(array);    //ArrayCollection的构造方法有参数的话则一定是Array对象作为参数
     if(twoArrayCollection.contains(array[1])){
      var objIndex:int = twoArrayCollection.getItemIndex(array[1]);    //返回该项目的索引
      trace(objIndex);
     }
//        trace("OK");
//     }
    }
   
   
   ]]>
</fx:Script>

<mx:Button id="insertID" x="320" label="添加对象" click="insertCollection();"/>
<mx:Button id="deleteID" x="450" label="删除对象" click="deleteCollection();"/>
<mx:Button id="seleteID" x="600" label="查询对象" click="selectCollection();"/>

<fx:Declarations>
   <!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>

</s:Application>