树形下拉框treecombobox的默认选项
我在网上找到个树型下拉框treecombobox的例子，想改来用，但是初始默认选项总是调不出来，有人能帮我看看吗，谢谢！
flex下的树形下拉框treecombobox
<?xml version="1.0" encoding="utf-8"?>
<mx:ComboBox xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="initComponent()">
<mx:Script>
<![CDATA[
import mx.events.FlexEvent;
[Bindable]
private var _label:String;
[Bindable]
public var treeSelectedItem:Object;
public function initComponent():void {
}
public function updateLabel(event:*):void {
_label = event.currentTarget.selectedItem[this.labelField];
treeSelectedItem = event.currentTarget.selectedItem;
}
override protected function updateDisplayList(unscaledWidth:Number,
unscaledHeight:Number):void {
super.updateDisplayList(unscaledWidth, unscaledHeight);
if(dropdown && _label != null){
text = _label;
}
}
]]>
</mx:Script>
<mx:dropdownFactory>
<mx:Component>
<mx:Tree creationComplete="initTree()" change="outerDocument.updateLabel(event)" showRoot="true" height="500" width="500">
<mx:Script>
<![CDATA[
public function initTree():void {
var len:int=super.dataProvider.length;
for(var i:int;i<len;i++) {
super.expandChildrenOf(super.dataProvider[i], true);
}
super.selectedItem=outerDocument.treeSelectedItem;
}
]]>
</mx:Script>
</mx:Tree>
</mx:Component>
</mx:dropdownFactory>
</mx:ComboBox>
调用的app代码如下：
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:ns1="components.*">
<ns1:ComboTree width="300" id="combo" labelField="@label" >
<mx:XMLListCollection id="MailBox">
<mx:XMLList>
<folder label="Mail">
<folder label="INBOX"/>
<folder label="Personal Folder">
<Pfolder label="Business" />
<Pfolder label="Demo" />
<Pfolder label="Personal" isBranch="true" />
<Pfolder label="Saved Mail" />
</folder>
<folder label="Sent" />
<folder label="Trash" />
</folder>
<folder label="Mail2">
<folder label="INBOX2"/>
<folder label="Personal Folder2">
<Pfolder label="Business2" />
<Pfolder label="Demo2" />
<Pfolder label="Personal2" isBranch="true" />
<Pfolder label="Saved Mail2" />
</folder>
<folder label="Sent2" />
<folder label="Trash2" />
</folder>
</mx:XMLList>
</mx:XMLListCollection>
</ns1:ComboTree>
</mx:Application>
[解决办法]
在initComponent里
写
this.prompt="XXX";
或者
this.selectedItem=xxx;
或
this.selectedIndex=1;
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