Question

我正在尝试使用以下语法构建一个数组数组。我的输出绝对不是我想要实现的。这是我的代码：

var labs:ArrayCollection = new ArrayCollection();
    var sets:ArrayCollection = new ArrayCollection();

    var labsArray:Array = ["ProDPI","WHCC","Tin"];
    var setsArray:Array = ["Set1","Set2","Set3"];

    var folders:ArrayCollection = new ArrayCollection();
    var foldersArray:Array = [labsArray, setsArray];

    var objFolderBuild:Object = new Object;

        for (var i:int = 0; i< foldersArray.length;i++) {
                for (var j:int = 0; j < foldersArray[i].length; j++) {
                    objFolderBuild.labName = foldersArray[i][j];
                    folders.addItem(objFolderBuild);
                }
        }
labFolderList.labelField="labName";
labFolderList.dataProvider=folders;
setFolderList.labelField="setName";
setFolderList.dataProvider=folders;

我的输出是6个引用“Set3”。我的for循环显然有问题，但我无法理解。任何想法都会有很大的帮助。

Answer 1

我将这个快速应用程序汇总在一起，以证明您的代码正确地描述了foldersArray [i] [j]。它是你应用程序代码的90％。

但是，我想指出objFoldersBuild对象只创建一次。因此，每次循环执行的操作都会更改现有对象属性的值，并将其添加到文件夹ArrayCollection中。你有一个ArrayCollection与同一个确切对象的多个副本。答案是每次循环创建一个新对象。

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
                       xmlns:s="library://ns.adobe.com/flex/spark" 
                       xmlns:mx="library://ns.adobe.com/flex/mx" preinitialize="windowedapplication1_preinitializeHandler(event)">
    <fx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;
            import mx.events.FlexEvent;

            protected function windowedapplication1_preinitializeHandler(event:FlexEvent):void
            {
                var labs:ArrayCollection = new ArrayCollection();
                var sets:ArrayCollection = new ArrayCollection();

                var labsArray:Array = ["ProDPI","WHCC","Tin"];
                var setsArray:Array = ["Set1","Set2","Set3"];

                var folders:ArrayCollection = new ArrayCollection();
                var foldersArray:Array = [labsArray, setsArray];

                var objFolderBuild:Object = new Object;

                for (var i:int = 0; i< foldersArray.length;i++) {
                    for (var j:int = 0; j < foldersArray[i].length; j++) {
                        trace(foldersArray[i][j]);
                                objFolderBuild  = new Object;
                        objFolderBuild.labName = foldersArray[i][j];
                        folders.addItem(objFolderBuild);
                    }
                }
/*              labFolderList.labelField="labName";
                labFolderList.dataProvider=folders;
                setFolderList.labelField="setName";
                setFolderList.dataProvider=folders; */
            }

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

Flex：循环遍历数组

1 个答案: