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What is BookMark Error in flex and how it is resolved?

vmarada
vmarada asked
on
Medium Priority
1,793 Views
Last Modified: 2012-05-07
var res:ArrayCollection = event.result as  ArrayCollection;
if(folderObj.children != null)
       folderObj.children.addItem(res[i]);

In the above code, i am getting the following error.

Error: Bookmark no longer valid.
      at ListCollectionViewCursor/seek()
      at mx.collections::HierarchicalCollectionViewCursor/get current()
      at mx.collections::HierarchicalCollectionViewCursor/collectionChangeHandler()
      at flash.events::EventDispatcher/dispatchEventFunction()
      at flash.events::EventDispatcher/dispatchEvent()
      at mx.collections::HierarchicalCollectionView/nestedCollectionChangeHandler()
      at flash.events::EventDispatcher/dispatchEventFunction()
      at flash.events::EventDispatcher/dispatchEvent()
      at mx.collections::ListCollectionView/dispatchEvent()
      at mx.collections::ListCollectionView/addItemsToView()
      at mx.collections::ListCollectionView/listChangeHandler()
      at flash.events::EventDispatcher/dispatchEventFunction()
      at flash.events::EventDispatcher/dispatchEvent()
      at mx.collections::ArrayList/internalDispatchEvent()
      at mx.collections::ArrayList/addItemAt()
      at mx.collections::ListCollectionView/addItemAt()
      at mx.collections::ListCollectionView/addItem()
      at com.zetainteractive.model.managers::ListManager/sampleData()
      at com.cynergysystems.tango::GenericResponder/result()
      at mx.rpc::AsyncToken/http://www.adobe.com/2006/flex/mx/internal::applyResult()
      at mx.rpc.events::ResultEvent/http://www.adobe.com/2006/flex/mx/internal::callTokenResponders()
      at mx.rpc::AbstractOperation/http://www.adobe.com/2006/flex/mx/internal::dispatchRpcEvent()
      at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::resultHandler()
      at mx.rpc::Responder/result()
      at mx.rpc::AsyncRequest/acknowledge()
      at NetConnectionMessageResponder/resultHandler()
      at mx.messaging::MessageResponder/result()
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Sr. Software engineer
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Commented:
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Author

Commented:
folderObj.children is an ArrayCollection.
zzynxSr. Software engineer
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Commented:
>> folderObj.children is an ArrayCollection
Good! Since an ArrayCollection extends ListCollectionView:

var res:ArrayCollection = event.result as  ArrayCollection;
if(folderObj.children != null) {
       var ac:ArrayCollection = folderObj.children as ArrayCollection;
       ac.disableAutoUpdate();
       ac.addItem(res[i]);
       ac.enableAutoUpdate();
}

Author

Commented:
folderObj.children.enableAutoUpdate();

same error is being shown in the above line.

Error: Bookmark no longer valid.
      at ListCollectionViewCursor/seek()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:2048]
      at mx.collections::HierarchicalCollectionViewCursor/get current()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\collections\HierarchicalCollectionViewCursor.as:198]
      at mx.controls.advancedDataGridClasses::AdvancedDataGridBase/createRow()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\controls\advancedDataGridClasses\AdvancedDataGridBase.as:1629]
      at mx.controls.advancedDataGridClasses::AdvancedDataGridBase/makeRowsAndColumns()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\controls\advancedDataGridClasses\AdvancedDataGridBase.as:892]
      at mx.controls::AdvancedDataGridBaseEx/makeRowsAndColumns()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\controls\AdvancedDataGridBaseEx.as:1918]
      at mx.controls::AdvancedDataGrid/makeRowsAndColumns()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\controls\AdvancedDataGrid.as:7169]
      at mx.controls.listClasses::AdvancedListBase/makeRowsAndColumnsWithExtraRows()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\controls\listClasses\AdvancedListBase.as:1231]
      at mx.controls.listClasses::AdvancedListBase/updateDisplayList()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\controls\listClasses\AdvancedListBase.as:3501]
      at mx.controls::AdvancedDataGridBaseEx/updateDisplayList()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\controls\AdvancedDataGridBaseEx.as:1778]
      at mx.controls::AdvancedDataGrid/updateDisplayList()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\controls\AdvancedDataGrid.as:6007]
      at mx.controls.listClasses::AdvancedListBase/validateDisplayList()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\controls\listClasses\AdvancedListBase.as:3072]
      at mx.managers::LayoutManager/validateDisplayList()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:622]
      at mx.managers::LayoutManager/doPhasedInstantiation()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:695]
      at Function/http://adobe.com/AS3/2006/builtin::apply()
      at mx.core::UIComponent/callLaterDispatcher2()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8628]
      at mx.core::UIComponent/callLaterDispatcher()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8568]
      at flash.events::EventDispatcher/dispatchEventFunction()
      at flash.events::EventDispatcher/dispatchEvent()
      at mx.collections::HierarchicalCollectionView/nestedCollectionChangeHandler()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\collections\HierarchicalCollectionView.as:1202]
      at flash.events::EventDispatcher/dispatchEventFunction()
      at flash.events::EventDispatcher/dispatchEvent()
      at mx.collections::ListCollectionView/dispatchEvent()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:833]
      at mx.collections::ListCollectionView/addItemsToView()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:931]
      at mx.collections::ListCollectionView/listChangeHandler()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:1051]
      at mx.collections::ListCollectionView/handlePendingUpdates()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:1210]
      at mx.collections::ListCollectionView/enableAutoUpdate()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:370]
      at com.zetainteractive.model.managers::ListManager/sampleData()[D:\ZetaMail5\zetamail_flex\src\com\zetainteractive\model\managers\ListManager.as:2807]
      at com.cynergysystems.tango::GenericResponder/result()[D:\ZetaMail5\zetamail_flex\src\com\cynergysystems\tango\GenericResponder.as:22]
      at mx.rpc::AsyncToken/http://www.adobe.com/2006/flex/mx/internal::applyResult()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\AsyncToken.as:199]
      at mx.rpc.events::ResultEvent/http://www.adobe.com/2006/flex/mx/internal::callTokenResponders()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\events\ResultEvent.as:172]
      at mx.rpc::AbstractOperation/http://www.adobe.com/2006/flex/mx/internal::dispatchRpcEvent()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\AbstractOperation.as:193]
      at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::resultHandler()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\AbstractInvoker.as:193]
      at mx.rpc::Responder/result()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\Responder.as:43]
      at mx.rpc::AsyncRequest/acknowledge()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\AsyncRequest.as:74]
      at NetConnectionMessageResponder/resultHandler()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\messaging\channels\NetConnectionChannel.as:515]
      at mx.messaging::MessageResponder/result()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\messaging\MessageResponder.as:199]
zzynxSr. Software engineer
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Commented:
What if you remove the enableAutoUpdate() and just keep the disableAutoUpdate()?

Author

Commented:
The objects are not getting added to the folderObj, if i remove enableAutoUpdate().
zzynxSr. Software engineer
CERTIFIED EXPERT

Commented:
>> The objects are not getting added to the folderObj, if i remove enableAutoUpdate().
Well, they are but the view doesn't show them due to disableAutoUpdate() call as the Flex help states:

Prevents changes to the collection itself and items within the collection from being dispatched by the view. Also prevents the view from updating the positions of items if the positions change in the collection.

But the above is followed by:
The changes will be queued and dispatched appropriately after enableAutoUpdate is called.
The disableAutoUpdate method acts cumulatively; the same number of calls to enableAutoUpdate  are required for the view to dispatch events and refresh.

So, the question is: when calling enableAutoUpdate() again without having the problem...

Author

Commented:
how to find that ....by calling enableAutoUpdate() will not cause the problem....
zzynxSr. Software engineer
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Commented:
It's clear that calling disableAutoUpdate() helps in avoiding the error.
Apparently calling enableAutoUpdate() is also needed if you want the view to be updated according to the changes.
But if you do at that point, you get the same error.
Maybe you should call it "later"...

Could you try this:

var res:ArrayCollection = event.result as  ArrayCollection;
if(folderObj.children != null) {
       folderObj.children.disableAutoUpdate();
       folderObj.children.addItem(res[i]);
       callLater(
           public function():void {
                folderObj.children.enableAutoUpdate();
       });
}

Author

Commented:
Compilation error is showing in the above code at callLater saying that "call to a possibly undefined method callLater".
zzynxSr. Software engineer
CERTIFIED EXPERT

Commented:
Well, callLater() is a method that can be called on all objects that inherit from the UIComponent class.
I don't know the context of your code snippet.
I would suggest you call it on the "view class/control" that displays that collection.

Author

Commented:
Here the Problem is the code is in the Action Script File. How to deal with that in AS file
zzynxSr. Software engineer
CERTIFIED EXPERT

Commented:
>> the code is in the Action Script File
I was already assuming that, yes.
My comment stays valid.

If you simply wrote callLater() in fact you call it on this, being the instance of the class your AS file represents.
That class should inherit from UIComponent.

Author

Commented:
Addressed partiakl fix
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