cancel query task in flex

[ReenaSingh]

How to cancel the querying task of query task in the middle of query process and stop all query process.

[ReenaSingh]

Please help me, i need it urgently ... 😞

[RobertScheitlin__GISP]

Reena,

   Just remove the event listener form the query task. So if you are doing some code like this:

queryTask.execute(query, new AsyncResponder(onResult, onFault));
//you need to change it to
queryTask.addEventListener(QueryEvent.EXECUTE_COMPLETE, onResult);
queryTask.addEventListener(FaultEvent.FAULT, onFault);
queryTask.execute(query);
//That way you can use remove listener
queryTask.removeEventListener(QueryEvent.EXECUTE_COMPLETE, onResult);

[DasaPaddock]

Here's another thread on this topic:
http://forums.arcgis.com/threads/19168-Canceling-an-Asynchronous-call?p=61887

[ReenaSingh]

Reena,

   Just remove the event listener form the query task. So if you are doing some code like this:

queryTask.execute(query, new AsyncResponder(onResult, onFault));
//you need to change it to
queryTask.addEventListener(QueryEvent.EXECUTE_COMPLETE, onResult);
queryTask.addEventListener(FaultEvent.FAULT, onFault);
queryTask.execute(query);
//That way you can use remove listener
queryTask.removeEventListener(QueryEvent.EXECUTE_COMPLETE, onResult);

hello,
But I am not using queryTask.addEventListener(QueryEvent.EXECUTE_COMPLETE, onResult);
queryTask.addEventListener(FaultEvent.FAULT, onFault);
My code is :
queryTask.executeForIds(query,new AsyncResponder(onResult,onFault,token))
Now I want to stop this task in between.

[RobertScheitlin__GISP]

Reena,

queryTask.executeForIds(query,new AsyncResponder(onResult,onFault,token))
//you need to change it to
queryTask.addEventListener(QueryEvent.EXECUTE_FOR_IDS_COMPLETE, onResult);
queryTask.addEventListener(FaultEvent.FAULT, onFault);
queryTask.executeForIds(query);
//That way you can use remove listener
queryTask.removeEventListener(QueryEvent.EXECUTE_COMPLETE, onResult);

[ReenaSingh]

Reena, 

queryTask.executeForIds(query,new AsyncResponder(onResult,onFault,token))
//you need to change it to
queryTask.addEventListener(QueryEvent.EXECUTE_FOR_IDS_COMPLETE, onResult);
queryTask.addEventListener(FaultEvent.FAULT, onFault);
queryTask.executeForIds(query);
//That way you can use remove listener
queryTask.removeEventListener(QueryEvent.EXECUTE_COMPLETE, onResult);

Hello,

Then how to pass token as object through this.

[RobertScheitlin__GISP]

Reena,

   The only way that I know of to pass a token object to an event listener is to create an inline function and that defeats the ability to remove the event listener. If you really need that token you need to find away to create a var that can hold the object that you can access from the onResult function.

[DasaPaddock]

Another approach could be to keep using responders but create a class member like "private var requestCancelled:Boolean" that you check in your onResult().

[ReenaSingh]

Reena,

   The only way that I know of to pass a token object to an event listener is to create an inline function and that defeats the ability to remove the event listener. If you really need that token you need to find away to create a var that can hold the object that you can access from the onResult function.

Hi,

Actually i have some set of queries which run in loops, after execution of these queries, there are some other queries which needs to be fired.
Then I want to stop all these queries, for which I have used removeEventlisteners but I am not able to stop those which are already got excuted in loop.
For this i have even used even Boolean to check the condition for stopping, but the queries which are already excuted; am not able to stop them. Is there any property in the GIS Flex api to stop executions of all queries at a time.