Question

我试图在运行时访问datagrid，并希望像

一样将数据分配给它

public function getGridData（reportsArray：ArrayCollection）：void {

             reportData = reportsArray; 
             trace(" The length of the datagrid is "+reportData.length);
                        graphDataGrid.dataProvider = reportData;            
             invalidateDisplayList();                           

        }

但是我收到了这个错误

TypeError：错误＃1009：无法访问空对象引用的属性或方法。 at views.charts :: ComparisonAnalysis / createDataGrid（）[C：\ FlexProjects \ AdvancedMetering \ views \ charts \ ComparisonAnalysis.mxml：32] at views.charts :: ComparisonAnalysis / getGridData（）[C：\ FlexProjects \ AdvancedMetering \ views \ charts \ ComparisonAnalysis.mxml：26] at components.CustomReport :: CustomReportSelector / getResultHandler（）[C：\ FlexProjects \ AdvancedMetering \ components \ CustomReport \ CustomReportSelector.mxml：147] at components.CustomReport :: CustomReportSelector / __ reportingBase_dataGridResultChanged（）[C：\ FlexProjects \ AdvancedMetering \ components \ CustomReport \ CustomReportSelector.mxml：203] 在flash.events::EventDispatcher/dispatchEventFunction（） at flash.events::EventDispatcher/dispatchEvent(）在mx.core :: UIComponent / dispatchEvent（）[C：\ autobuild \ 3.2.0 \ frameworks \ projects \ framework \ src \ mx \ core \ UIComponent.as：9298] at components.CustomReport :: ReportingBase / getDataFromServer（）[C：\ FlexProjects \ AdvancedMetering \ components \ CustomReport \ ReportingBase.as:98] at components.CustomReport :: ReportingBase / getResults（）[C：\ FlexProjects \ AdvancedMetering \ components \ CustomReport \ ReportingBase.as:78] at components.CustomReport :: CustomReportSelector / getGraphData（）[C：\ FlexProjects \ AdvancedMetering \ components \ CustomReport \ CustomReportScripts.as:20] at components.CustomReport :: CustomReportSelector / __ getGraphandGridData_click（）[C：\ FlexProjects \ AdvancedMetering \ components \ CustomReport \ CustomReportSelector.mxml：248]

有些人可以告诉我，在这个时间点没有实例化数据网格的问题是什么

Sudee [

Answer 1

如果DataGrid此时未实例化，由于延迟实例化或一般组件生命周期，我将在类上创建一个ArrayCoolection属性，如：

[Bindable] private var graphDataGridDataProvider:ArrayCollection;

并将graphDataGrid的dataProvider绑定到此变量：

<mx:DataGrid id="graphDataGrid" dataProvider="{graphDataGridProvider}" />

然后在你的getGridData方法中设置绑定属性。

将数据分配给dataGrid Dataprovided时出错

1 个答案: