Question

有人可以引导我在flex中的一个ArrayCollection中移动一个元素吗？

我有一个排序对象的ArrayCollection。

现在我需要将一行移到ArrayCollection的末尾。

为了说明，

arrayCollection = ["Cars","Other","Trucks"];

此ArrayCollection已排序。现在我需要将'Other'移动到ArrayCollection的末尾。即，我需要将数组重组为

arrayCollection  = ["Cars","Trucks","Other"];

这是我的代码，

if(Index != -1){ 
CategoryList.addItem(CategoryList.removeItemAt(Index)); 
trace(CategoryList.source.join());}

'CategoryList'是一个长度为28的ArrayCollection，ArrayCollection中的每个对象都有3个属性。

'RemoveItem'工作正常，但'AddItem'会抛出此错误，

RangeError：指定的索引'28'超出范围。在mx.collections :: ArrayList / addItemAt（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ collections \ ArrayList.as：305] 在mx.collections :: ListCollectionView / addItemAt（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ collections \ ListCollectionView.as：501] 在mx.collections :: ListCollectionView / addItem（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ collections \ ListCollectionView.as：470] at components :: Home / creationOver（）[C：\ Documents and Settings \ immanuel \ My Documents \ Flex Builder 3 \ Porj \ src \ components \ Home.mxml：113] at components :: Home / ___ Home_Canvas1_creationComplete（）[C：\ Documents and Settings \ immanuel \ My Documents \ Flex Builder 3 \ Porj \ src \ components \ Home.mxml：2] 在flash.events::EventDispatcher/dispatchEventFunction（） at flash.events::EventDispatcher/dispatchEvent(）在mx.core :: UIComponent / dispatchEvent（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ core \ UIComponent.as：9298] 在mx.core :: UIComponent / set initialized（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ core \ UIComponent.as：1169] 在mx.managers :: LayoutManager / doPhasedInstantiation（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ managers \ LayoutManager.as：718] 在功能/ http://adobe.com/AS3/2006/builtin::apply() 在mx.core :: UIComponent / callLaterDispatcher2（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ core \ UIComponent.as：8628] at mx.core :: UIComponent / callLaterDispatcher（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ core \ UIComponent.as:8568]

然后我尝试插入特定位置，

CategoryList.addItemAt(CategoryList.removeItemAt(Index), CategoryList.length-1);

但是，这会抛出以下错误，

TypeError：错误＃1006：value不是函数。 at mx.collections :: ListCollectionView / getFilteredItemIndex（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ collections \ ListCollectionView.as：564] 在mx.collections :: ListCollectionView / addItemsToView（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ collections \ ListCollectionView.as：896] at mx.collections :: ListCollectionView / listChangeHandler（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ collections \ ListCollectionView.as：1051] 在flash.events::EventDispatcher/dispatchEventFunction（） at flash.events::EventDispatcher/dispatchEvent(）在mx.collections :: ArrayList / internalDispatchEvent（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ collections \ ArrayList.as：510] 在mx.collections :: ArrayList / addItemAt（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ collections \ ArrayList.as：311] 在mx.collections :: ListCollectionView / addItemAt（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ collections \ ListCollectionView.as：501] at components :: Home / creationOver（）[C：\ Documents and Settings \ immanuel \ My Documents \ Flex Builder 3 \ Porj \ src \ components \ Home.mxml：113] at components :: Home / ___ Home_Canvas1_creationComplete（）[C：\ Documents and Settings \ immanuel \ My Documents \ Flex Builder 3 \ Porj \ src \ components \ Home.mxml：2] 在flash.events::EventDispatcher/dispatchEventFunction（） at flash.events::EventDispatcher/dispatchEvent(）在mx.core :: UIComponent / dispatchEvent（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ core \ UIComponent.as：9298] 在mx.core :: UIComponent / set initialized（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ core \ UIComponent.as：1169] 在mx.managers :: LayoutManager / doPhasedInstantiation（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ managers \ LayoutManager.as：718] 在功能/ http://adobe.com/AS3/2006/builtin::apply() 在mx.core :: UIComponent / callLaterDispatcher2（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ core \ UIComponent.as：8628] at mx.core :: UIComponent / callLaterDispatcher（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ core \ UIComponent.as:8568]

Answer 1

var array:Array = ["Cars", "Other", "Trucks"];
pushToEnd(array, 1);

trace(array.join()); //Cars,Trucks,Other

/**
* Removes the item at 'index' and pushes it to the back of the array.
*/

function pushToEnd(array:Array, index:Number):void
{
  array.push(array.splice(index, 1)[0]);
}

使用ArrayCollection

更容易

arrayCol.addItem(arrayCol.removeItemAt(index));

更新：工作样本 - 亲眼看看。

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" 
    creationComplete="create();">
    <mx:Button label="push" click="handle();"/>
    <mx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;

            private var ac:ArrayCollection;

            private function handle():void
            {
                ac.addItem(ac.removeItemAt(1));
                trace(ac.source.join());
            }

            private function create():void
            {
                ac = new ArrayCollection(["asd", "qwe", "zxc", "123"]);
                trace(ac.source.join());
            }
        ]]>
    </mx:Script>
</mx:Application>

移动ArrayCollection中的元素 - FLEX

1 个答案: