[jira] [Updated] (FLEX-34554) "cannot access property or method of a null object" error shows when tying to set editedItemPosition in a datagrid

["Bi Jane Jia (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLEX-34554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bi Jane Jia updated FLEX-34554:
-------------------------------
    Attachment: twoGridSample.zip

> "cannot access property or method of a null object" error shows when tying to set editedItemPosition in a datagrid
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: FLEX-34554
>                 URL: https://issues.apache.org/jira/browse/FLEX-34554
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: mx: DataGrid
>    Affects Versions: Adobe Flex SDK 4.6 (Release)
>         Environment: IE8
>            Reporter: Bi Jane Jia
>             Fix For: Apache Flex 4.11.0
>
>         Attachments: twoGridSample.zip
>
>
> Problem:
> We see "cannot access property or method of a null object" error after upgrading from Flex SDK 2 to Flex SDK 4.6.
> We have found that:
> 1. The problem also happens in Firefox and it does not happen in Chrome.
> 2. The problem does not happen if using mouse to click "default button".
> 3. The problem does not happen when compiling with Flex SDK 4.11.
> 4. if there is no alert and only set editedItemPosition in the handling of default button, error does not happen.
> Method:
> 1. Run the sample project attached.
> 2. click on the first line of Datagird B, you can see that "default button" got focus.
> 3. press enter key
> 4. in the alert, click "OK".
> Result:
> following error shows up and the page becomes black and nothing can be done.
> TypeError: Error #1009: cannot access property or method of a null object.
> 	at mx.controls::DataGrid/itemEditorItemEditBeginHandler()[E:\dev\4.y\frameworks\projects\mx\src\mx\controls\DataGrid.as:5275]
> 	at flash.events::EventDispatcher/dispatchEventFunction()
> 	at flash.events::EventDispatcher/dispatchEvent()
> 	at mx.core::UIComponent/dispatchEvent()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:13152]
> 	at mx.controls::DataGrid/commitEditedItemPosition()[E:\dev\4.y\frameworks\projects\mx\src\mx\controls\DataGrid.as:4107]
> 	at mx.controls::DataGrid/updateDisplayList()[E:\dev\4.y\frameworks\projects\mx\src\mx\controls\DataGrid.as:1814]
> 	at mx.controls.listClasses::ListBase/validateDisplayList()[E:\dev\4.y\frameworks\projects\mx\src\mx\controls\listClasses\ListBase.as:3963]
> 	at mx.managers::LayoutManager/validateDisplayList()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:736]
> 	at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:819]
> 	at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1180]
> Expected:
> No error shows up and the focus can be set expectedly.
> Workaround:
> Not available



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