我是 Flex 新手,我似乎无法让它工作。本质上,我有一个选择框,它的可用数据依赖于另一个组合框。
每个CategoryType中有多个TreatmentType。
这是我的代码:
组合框更改;更新选择框:
private function refreshAvailableTreatmentTypes():void {
// this is the combo box
fAccomplishment.habitatType = habitatTypeId.selectedIndex != -1 ? habitatTypeId.selectedItem as HabitatType : null;
// fAccompRemote is a RemoteObject
var treatmentList:ArrayCollection = fAccompRemote.getValidTreatments(fAccompForm.accomplishment, fAccomplishment.habitatType);
if ( fAccompForm.categoryTypes != null ) {
// All categories are always shown. These are passed to the form on construction.
for each ( var currentCat:CategoryType in fAccompForm.categoryTypes ) {
var catAdded:Boolean = false;
/* loop through all the treatments in each Category and add them to
* the available list if they meet the criteria */
for each ( var currentTreat:TreatmentType in currentCat.treatments ) {
if (currentTreat.id in treatmentList || treatmentList.length == 0) {
if (!catAdded) {
// fCatsAndTreats defined as a [Bindable] private var
fCatsAndTreats.addItem( currentCat );
catAdded = true;
}
fCatsAndTreats.addItem( currentTreat );
}
}
}
}
}
服务方式:
@RemotingInclude
public List<TreatmentType> getValidTreatments(Accomplishment accomp, HabitatType selectedHabitatType){
if ( accomp == null || accomp.getGeometry() == null || accomp.getHabitatType() == null) {
return new ArrayList<TreatmentType>();
}
Geometry accompGeo = accomp.getGeometry();
List<TreatmentType> optionList = new ArrayList<TreatmentType>();
String geomName = null;
if ( accompGeo instanceof Point || accompGeo instanceof MultiPoint ) {
geomName = "Point";
} else if ( accompGeo instanceof LineString || accompGeo instanceof MultiLineString) {
geomName = "Line";
} else if ( accompGeo instanceof Polygon || accompGeo instanceof MultiPolygon ) {
geomName = "Polygon";
}
Integer habTypeId = null;
if (selectedHabitatType == null) {
habTypeId = accomp.getHabitatType().getId();
} else {
habTypeId = selectedHabitatType.getId();
}
optionList = accomplishmentDao.getValidTreatments(geomName, habTypeId);
return optionList;
}
TypeError:错误 #1034:类型强制失败:无法将 mx.rpc::AsyncToken@1af48641 转换为 mx.collections.ArrayCollection。
我该怎么做?我发现THIS但它似乎对我没有多大帮助: 。任何资源或信息将不胜感激。
最佳答案
对 RemoteObject 的调用是异步的 - fAccompRemote.getValidTreatments 的返回值是一个 AsyncToken,它定义了如何处理结果(当返回结果时)。
当远程调用返回时,它将调用结果处理程序或错误处理程序,具体取决于调用是成功还是出现错误。
您可以通过多种不同的方式为您的代码设置响应处理程序 - 您可以在调用中添加EventListener,或者在从调用返回的 AsyncToken 中设置响应程序。
fAccompRemote.addEventListener(ResultEvent.RESULT, resultHandler);
fAccompRemote.getValidTreatments(...)
-或-
var token:AsyncToken = fAccompRemote.getValidTreatments(...);
token.addResponder(new AsyncResponder(resultHandler, faultHandler));
无论哪种情况,resultHandler
都会接收 ResultEvent 事件,以及从 getValidTreatments
返回的 ArrayCollection
protected function resultHandler(event:ResultHandler):void
{
var results:ArrayCollection = event.result as ArrayCollection;
}
关于java - FLEX - 将 AsyncToken 转换为 ArrayCollection,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23478894/