Thanks Vaibhav and Andrea for your suggestions.
Andrea : You suggestion looks working , But got in one more problem . Could
you please help me ?
If I call SingletonXML.getInstance().data; It is returning Null because the
of getResult() is returning the data later . Since the calls are
asynchronous get Data() is getting called first and then getResult().
I checked the event data and data is there in the event .
I came into this problem because of "<XML source = "is crashing my IE7,
Otherwise I could have done it using XML tag instead HTTPService ( for local
data I am using HTTPService ) . Please see the code below.
package Components
{
import mx.controls.Alert;
import mx.rpc.events.ResultEvent;
import mx.rpc.http.HTTPService;
public class SingletonXML
{
private static var _instance: SingletonXML;
private var _data:XMLList;
public function SingletonXML() {
if (_instance != null)
trace("Constructor shouldn't be called directly...
now I'll have to kill you")
_instance = this;
this.initData();
}
private function initData():void {
var service:HTTPService =new HTTPService();
service.url="Components/StudentData.xml";
service.resultFormat="e4x";
service.addEventListener("result", getResult);
service.send();
}
private function onDataLoaded():void {
//Store data
//this._data = [loaded data];
}
private function getResult(event:ResultEvent):void{
Alert.show("this is in get result");
_data=XMLList(event.result.Country);
}
public static function getInstance():SingletonXML{
if (! _instance)
_instance = new SingletonXML();
return _instance;
}
public function get data():XMLList {
Alert.show("this is in get data");
return this._data;
}
}
}
On Tue, Nov 3, 2009 at 4:38 PM, Andrea Giorgetta
<[email protected]>wrote:
> Hi Kiran.
> I think you should create a "ModelLocator" singleton class, that gets and
> store the xml information. It would be something like this:
>
> public class MyModelLocator
> {
> private static var _instance: MyModelLocator;
> private var _data:XMLList;
>
> public function MyModelLocator() {
> if (_instance != null)
> trace("Constructor shouldn't be called directly... now
> I'll have to kill you")
> _instance = this;
> this.initData();
> }
>
> private function initData():void {
> //Load data....
> }
> private function onDataLoaded() {
> //Store data
> this._data = [loaded data];
> }
>
> public static function getInstance():MyModelLocator{
> if (! _instance)
> _instance = new MyModelLocator();
> return _instance;
> }
>
> public function get data():XMLList {
> return this._data;
> }
> }
>
> In order to get data in each combobox, you would set
> dataprovider="{MyModelLocator.getInstance.data}" (if that XMLList already
> has the correct structure to be directly used as a dataprovider in the
> combobox... otherwise now is the time to change it ;) )
> This way:
> - There's only one instance of MyModelLocator at anytime, anywhere.
> - initData is called only once, so the data is retrieved only once.
> - By storing the data within the singleton class, it's available to the
> whole application by just importing the class.
>
>
> Hope it solves your issue.
> Best regards
> Andrea.
>
>
>
>
> On Tue, Nov 3, 2009 at 5:59 PM, Kiran Kumar Vasireddy <[email protected]
> > wrote:
>
>> Hi ,
>>
>> I am calling httpservice.send() method and getting the data and populating
>> it in XMLList . I want this step to be done only once and want to reuse the
>> data what ever I got .
>> My scenario is like this
>>
>> 1)Creating Custom combobox component
>> 2) Calling send() in the custom component and populating the combobox
>>
>> I want to create around 5 instances of the above component . But what is
>> happening is the send() is getting called again and again . Is there any way
>> to restrict this and get the data only once and use it for my 5 instances .
>> The problem here is If I use http send() method when I load the application
>> , This works perfect . But we want that to be called only from component and
>> want to use the same component again and again.
>>
>> Thanks for your help
>> Kiran
>> >>
>>
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