FLEX 集合数组ArrayCollection操作实例

<?xml version="1.0" encoding="utf-8"?>
<!-- Simple example to demonstrate the Halo DataGrid control. -->
<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">
    
        
        <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>