[FLEX-34218] Binding error in DataGridColumn

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: Apache Flex 4.12.0
• Component/s: Data Binding, mx: DataGrid
• Labels: DataGridColumn
• Environment: Windows 7 64bits
• Assignee: Justin Mclean
• Reporter: Fernando Hernandez
• Created: 10/Apr/14 15:01
• Updated: 11/Oct/14 23:59
• Resolved: 11/Oct/14 23:59

Description

The mx:DataGridColumn launch exception when dataField property is used with any getter function that can be throw a TypeError. The errors aren't catched as expected in mx:DataGridColumn#itemToLabel() function. The spark GridColumn still ignores errors.

Existing applications may break.

In Flex 4.12 you remove the try catch for mx:DataGridColumn#itemToLabel() for data[datafield] in this changeset: https://fisheye6.atlassian.com/changelog/flex-sdk?cs=9f8aab8675dc3288be9b1b906da64b5c91728d70

StackTrace
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at Item/get count()[C:\desarrollo\workspaces\fluid\flexbuilder7-workspace\asdf\src\Item.as:16]
at mx.controls.dataGridClasses::DataGridColumn/itemToLabel()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridColumn.as:1749]
at mx.controls.dataGridClasses::DataGridBase/makeListData()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1493]
at mx.controls::DataGrid/http://www.adobe.com/2006/flex/mx/internal::setupRendererFromData()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/mx/src/mx/controls/DataGrid.as:2013]
at mx.controls::DataGrid/commitProperties()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/mx/src/mx/controls/DataGrid.as:1968]
at mx.core::UIComponent/validateProperties()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/framework/src/mx/core/UIComponent.as:8751]
at mx.managers::LayoutManager/validateProperties()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:605]
at mx.managers::LayoutManager/doPhasedInstantiation()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:821]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:1188]