Regarding Flex ArrayCollection

Question

Hi All,
I have a ArrayCollection which gets filled up by an DS fill()
method.
The ArrayCollection holds a single object.
When i bind this ArrayCollection to <mxLDataGrid/> the
results are displayed fine.
But when i try to get the Object by using getItemAt(0), am
getting this exception
RangeError: Index '0' specified is out of bounds.
at mx.collections::ListCollectionView/getItemAt()
at emp/::employeeChange()
at emp/__dgEmployee_change()
at
flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()
at
mx.controls.listClasses::ListBase/mx.controls.listClasses:ListBase::mouseUpHandler()
at
mx.controls::DataGrid/mx.controls:DataGrid::mouseUpHandler()
Here is the code am trying to get the object..
<mx:DataGrid id="dgEmployee" dataProvider="{employees}"
width="100%" height="100%"
alternatingItemColors="[#e6e6e6]" editable="false"
change="employeeChange()" valueCommit="employeeChange()">
<mx:columns>
<mx:DataGridColumn dataField="companyID"
headerText="Company Id" />
<mx:DataGridColumn dataField="name"
headerText="Name"/>
</mx:columns>
</mx:DataGrid>
private function employeeChange():void
if (dgEmployee.selectedIndex > -1)
if (employee !=
employees.getItemAt(dgEmployee.selectedIndex))
employee = employees.getItemAt(dgEmployee.selectedIndex) as
EmployeeDetails;
dsEmployeeFinancial.fill(employeeFinancials, "by-employee",
employee.id);
var myCursor:IViewCursor =
employeeFinancials.createCursor();
employeeFinancial = employeeFinancials.getItemAt(0) as
EmployeeFinancial;
Alert.show("Employee PF :
"+employeeFinancial.providendFund);
Error Occures in the function employeeChange() when getting
the Object from employeeFinancials.getItemAt(0) ;
But the Follwoing DataGrid is working fine without any
exception
<mx:DataGrid id="dgFinance"
dataProvider="{employeeFinancials}" width="100%" height="100%"
alternatingItemColors="[#e6e6e6]" editable="false">
<mx:columns>
<mx:DataGridColumn dataField="basic" headerText="Basic"
/>
<mx:DataGridColumn dataField="houseRentAllowance"
headerText="House Rent Allowance"/>
</mx:columns>
</mx:dataGrid>

Answer 1

You could try testing to see if your ArrayCollection actually
has any objects in it yet. It also seems like you could use the
selectedItem in your code as below:
private function employeeChange():void
if (dgEmployee.selectedIndex > -1)
if (employee != dgEmployee.selectedItem)
employee = dgEmployee.selectedItem as EmployeeDetails;
dsEmployeeFinancial.fill(employeeFinancials, "by-employee",
employee.id);
var myCursor:IViewCursor = employeeFinancials.createCursor();
if (employeeFinancials.length > 0) {
employeeFinancial = employeeFinancials.getItemAt(0) as
EmployeeFinancial;
Alert.show("Employee PF : "+employeeFinancial.providendFund);
Vygo