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https://issues.apache.org/jira/browse/FLEX-34022?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Mclean reassigned FLEX-34022:
------------------------------------
Assignee: Justin Mclean
> Null object reference when setting columns on Spark DataGrid
> ------------------------------------------------------------
>
> Key: FLEX-34022
> URL: https://issues.apache.org/jira/browse/FLEX-34022
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: DataGrid
> Affects Versions: Apache Flex 4.9.0, Apache Flex 4.11.0
> Environment: Mac OS X
> Reporter: Curtis Aube
> Assignee: Justin Mclean
>
> If you set a bindable columns property for the DataGrid before it is
> initialized and set an itemRenderer for one of the columns, you get a null
> object reference when the DataGrid is initialized.
> Here is an example:
> <?xml version="1.0" encoding="utf-8"?>
> <s:Application creationComplete="creationComplete()" minHeight="600"
> minWidth="955" preinitialize="setColumns()"
> xmlns:fx="http://ns.adobe.com/mxml/2009";
> xmlns:mx="library://ns.adobe.com/flex/mx"
> xmlns:s="library://ns.adobe.com/flex/spark">
> <fx:Script>
> <![CDATA[
> import mx.collections.ArrayCollection;
> import mx.collections.ArrayList;
> import spark.components.gridClasses.GridColumn;
> import spark.skins.spark.DefaultItemRenderer;
> [Bindable]
> private var columns:ArrayList;
> [Bindable]
> private var dp:ArrayCollection;
> private function creationComplete():void
> {
> var myHistoryItems:Array = new Array;
> myHistoryItems.push({filename: "Testing"});
> dp = new ArrayCollection(myHistoryItems);
> }
> private function setColumns():void
> {
> var column:GridColumn
> var myColumns:ArrayList = new ArrayList;
> column = new GridColumn("filename");
> column.headerText = "Filename";
> column.itemRenderer = new
> ClassFactory(DefaultItemRenderer);
> myColumns.addItem(column);
> columns = myColumns;
> }
> ]]>
> </fx:Script>
> <s:DataGrid height="100%" width="100%" columns="{columns}"
> dataProvider="{dp}"/>
> </s:Application>
> Here is the stack trace:
> TypeError: Error #1009: Cannot access a property or method of a null object
> reference.
> at
> spark.components::Group/addElement()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/spark/src/spark/components/Group.as:1395]
> at
> spark.components.gridClasses::GridLayout/createTypicalItemRenderer()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/spark/src/spark/components/gridClasses/GridLayout.as:756]
> at
> spark.components.gridClasses::GridLayout/updateTypicalCellSizes()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/spark/src/spark/components/gridClasses/GridLayout.as:891]
> at
> spark.components.gridClasses::GridLayout/measure()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/spark/src/spark/components/gridClasses/GridLayout.as:452]
> at
> spark.components.supportClasses::GroupBase/measure()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/spark/src/spark/components/supportClasses/GroupBase.as:1156]
> at
> mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::measureSizes()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/framework/src/mx/core/UIComponent.as:8514]
> at
> mx.core::UIComponent/validateSize()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/framework/src/mx/core/UIComponent.as:8438]
> at
> spark.components::Group/validateSize()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/spark/src/spark/components/Group.as:1065]
> at
> mx.managers::LayoutManager/validateSize()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/framework/src/mx/managers/LayoutManager.as:673]
> at
> mx.managers::LayoutManager/doPhasedInstantiation()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/framework/src/mx/managers/LayoutManager.as:800]
> at
> mx.managers::LayoutManager/doPhasedInstantiationCallback()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/framework/src/mx/managers/LayoutManager.as:1188]
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