I have a dataGrid that uses a labelFunction for one of the columns to display a
text string instead of the foreign key integer. Most times the column text
does not display when the dataGrid is initially displayed, but will always
display after I update dataGrid's dataProvider. So I must have a timing
problem. The dataProvider for the dataGrid is an ArrayCollection that is
populated through an AMF remote object. This occurs initially using the
Application's 'creationComplete' event. I appreciate any ideas to help me
solve this issue.
Thanks,
Todd

Does the foreign key integer always display if you disable the labelFunction, or do you still get nothing?

Yes, if I remove the labelFunction the integer is always displayed correctly.

"tberg3db" <webforumsuser@macromedia.com> wrote in message
news:gghem1$qes$1@forums.macromedia.com...
>I have a dataGrid that uses a labelFunction for one of the columns to
>display a
> text string instead of the foreign key integer. Most times the column
> text
> does not display when the dataGrid is initially displayed, but will always
> display after I update dataGrid's dataProvider. So I must have a timing
> problem. The dataProvider for the dataGrid is an ArrayCollection that is
> populated through an AMF remote object. This occurs initially using the
> Application's 'creationComplete' event. I appreciate any ideas to help
> me
> solve this issue.

Are you getting a collection change event on the ArrayCollection?

Sorry, I didn't give much info. I've included relevant code now. When I put a
breakpoint in the labelFunction, the cAccountsDP ArrayCollection is empty at
the time the page is displayed. I have another function that updates the
dataGrid selectedItem values with formItem inputs. When that function is run,
the labelFunction gets fired again and now the cAccountsDP ArrayCollection is
populated and the column is displayed correctly.

<mx:Script>
<![CDATA[
[Bindable]
public var cAccountsDP:ArrayCollection;
[Bindable]
public var contactsDP:ArrayCollection;

// Application 'creationComplete' function
protected function ContactsInit():void
{
cAccountsDP = ActiveRecords.Accounts.findAll( );
contactsDP = ActiveRecords.Contacts.findAll( );
}

// Label Function to Display Account Name for Account_id
public function getAccountName(item:Object,columnataGridColumn): String
{
var tAccount_name: String = "";
for (var i:int=0;i<cAccountsDP.length;i++){
var tAccount_id:int = cAccountsDP[i].Account_id;
if(item.Account_id == tAccount_id){
tAccount_name = cAccountsDP[i].Account_name;
break;
}
}
return tAccount_name;
}
// function to update dataGrid with new form values
public function OnSave():void
{
if(contactEditAccount.selectedItem) contactsDG.selectedItem.Account =
contactEditAccount.selectedItem.Account_id;
}
]]>
</mx:Script>
<mxataGrid id="contactsDG" dataProvider="{contactsDP}">
<mx:columns>
<mxataGridColumn
headerText="Account"
dataField="Account_id"
labelFunction="getAccountName" />
</mx:columns>
</mxataGrid>

"tberg3db" <webforumsuser@macromedia.com> wrote in message
news:gghq1v$b8e$1@forums.macromedia.com...
> Sorry, I didn't give much info. I've included relevant code now. When I
> put a
> breakpoint in the labelFunction, the cAccountsDP ArrayCollection is empty
> at
> the time the page is displayed. I have another function that updates the
> dataGrid selectedItem values with formItem inputs. When that function is
> run,
> the labelFunction gets fired again and now the cAccountsDP ArrayCollection
> is
> populated and the column is displayed correctly.
>
> <mx:Script>
> <![CDATA[
> [Bindable]
> public var cAccountsDP:ArrayCollection;
> [Bindable]
> public var contactsDP:ArrayCollection;
>
> // Application 'creationComplete' function
> protected function ContactsInit():void
> {
> cAccountsDP = ActiveRecords.Accounts.findAll( );
> contactsDP = ActiveRecords.Contacts.findAll( );
> }

before your closing bracket just above, put this:

cAccountsDP.addEventListener(CollectionEvent.COLLE CTION_CHANGE,
changeHandler);
contactsDP..addEventListener(CollectionEvent.COLLE CTION_CHANGE,
changeHandler);

then add this somewhere in your code

private function changeHandler(e:CollectionEvent):void {
//put break point here
}

Does the event fire for either collection?

Hope this clarifies;

Amy

Stepping through the breakpoints, the event fires first for the contactsDP, then for the labelFunction, then for the cAccountsDP.

"tberg3db" <webforumsuser@macromedia.com> wrote in message
news:gghtov$fq0$1@forums.macromedia.com...
> Stepping through the breakpoints, the event fires first for the
> contactsDP, then for the labelFunction, then for the cAccountsDP.

Try setting the dp in the collection change handler instead of setting it
before the collection has arrived, using a temp var if necessary.

HTH;

Amy

The solution I found was to use the dataGrid's preinitialize event to set the dataProvider for the column labels.
Todd

You don't mention if you did this, but might also check into using a result handler on the remote object to assign the dataprovider to the Data Grid.