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Filling a tree using ArrayCollection data

Let's say I had an ArrayCollection array:

        public var ac:ArrayCollection= new ArrayCollection([
            {item:"dog", group:"Animals"},
            {item:"orange", group:"Fruits"}, 
            {item:"cat", group:"Animals"},
            {item:"apple", group:"Fruits"}
            ]);

How to create a tree component in Flex 3 that uses groups as nodes, with the corresponding elements listed under each node?

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3 answers

You can use the labelFieldtree property to indicate which property you want to be the label for each node.

In your example, this will give you a sibling Tree:

<mx:Tree id="tree" dataProvider="{ac}" labelField="item" />

These links should help you:

: ArrayCollection , . Tree, , .

"", , "". ArrayCollection Object, , , . : , "".

:

{name: "Animals", children: new ArrayCollection([ {name: "Dog"}, {name: "Cat"} ])}

, :

:
|
| -       |
      Dog
      |
     

Dog Cat children, ArrayCollection. ?

, . "" , Tree. labelFunction , String , , , node .

ArrayCollection , Tree.

<?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.ArrayCollection;
        [Bindable] public var ac:ArrayCollection= new ArrayCollection([
             { name: "Animals", children: new ArrayCollection([ {name: "dog"},    {name: "cat"}])},
             { name: "Fruits",  children: new ArrayCollection([ {name: "orange"}, {name: "apple"} ])}]);

    ]]>
</mx:Script>
<mx:Tree dataProvider="{ac}" labelField="name" />

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ArrayCollection node ArrayCollection.

Adobes.

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: !

<?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/mx"
creationComplete="windowedapplication1_creationCompleteHandler(event)" xmlns:local="*"
width="318" height="400">
<s:layout>
    <s:VerticalLayout/>
</s:layout>
<fx:Script>
    <![CDATA[
        import mx.events.CollectionEvent;
        import mx.events.FlexEvent;

        protected function windowedapplication1_creationCompleteHandler(event:FlexEvent):void
        {
            refreshTree();    
        }

        private function refreshTree():void{
            gc.refresh();
            myTree.dataProvider = gc.getRoot();
        }

    ]]>
</fx:Script>
<fx:Declarations>

    <s:ArrayCollection id="arcData">
            <local:TestItem year="2009" month="Jan" label="Jan Report 1"/>
            <local:TestItem year="2009" month="Jan" label="Jan Report 2"/>
            <local:TestItem year="2009" month="July" label="July Report 1"/>
            <local:TestItem year="2009" month="July" label="July Report 2"/>
            <local:TestItem year="2010" month="Feb" label="Feb Report 1"/>
            <local:TestItem year="2010" month="Feb" label="Feb Report 2"/>
            <local:TestItem year="2010" month="Dec" label="Dec Report 1"/>
            <local:TestItem year="2010" month="Dec" label="Dec Report 2"/>
    </s:ArrayCollection>

    <mx:GroupingCollection2 id="gc" source="{arcData}">
        <mx:grouping>
            <mx:Grouping>
                <mx:fields>
                    <mx:GroupingField name="year"/>
                    <mx:GroupingField name="month"/>    
                </mx:fields>
            </mx:Grouping>
        </mx:grouping>
    </mx:GroupingCollection2>
</fx:Declarations>

<mx:Tree id="myTree" dataProvider="{gc.getRoot()}" labelField="GroupLabel" width="100%" height="100%">

</mx:Tree>

</s:Application>
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