Update Tree data source with RemoteObject results

[plum001]

I'm trying use a RemoteObject to dynamically populate a Tree Control, but
when the data comes across the control is not updated with the results. The
tree displays correctly if I use static data defined in the component, but
doesn't display with dynamic data. Does anyone have some suggestions for
getting this to work?


Here are some examples of what I am doing:

Sample from my AccountView MXML file:

<mx:XML id="acctTreeData" />

<mx:Tree id="accountTree">
<mx: dataProvider>
{acctTreeData}
</mx: dataProvider>
</mx:Tree>


In my Java Server side Delegator class I return a simple XML String like so:

StringBuffer buff = new StringBuffer();
buff.append("<node label=\"account1\" balance=\"100.00\">");
buff.append(" <node label=\"account2\" balance=\"100.00\"/>");
buff.append(" <node label=\"account3\" balance=\"100.00\"/>");
buff.append(" <node label=\"account4\" balance=\"100.00\"/>");
buff.append("</node>");

System.out.println("XML Output: " + buff.toString());

return buff.toString();


Then in my client side delegator object I take the results and set them to the
Tree data object:

public function onResult( result ) : Void {
// Populate global trans list with results from server
//mx.core.Application.application.accountTree.dataPr ovider = result;
mx.core.Application.application.accountTree.acctTr eeData = result;

}

Any suggestions would be greatly appreciated.

Thanks,

Brett

[ntsiii]

Can you see your xml strung in the onResult function?
Try :
var xmlDP:XML = mx.utils.xmlUtils.createXML(result);
mx.core.Application.application.accountTree.dataPr ovider = xmlDP;

Tracy

[plum001]

Yes, I can see the XML string returned from the server in the onResult method.
I tried using the

var xmlDP:XML = mx.utils.XMLUtils.createXML(result);
mx.core.Application.application.accountTree.dataPr ovider = xmlDP;

as you suggested but it still doesn't update the tree control. Maybe there
is a problem with refreshing the Tree control during the asynchronous server
call.

Thanks for your above suggestion any other suggestions would be appreciated.

Brett

[ntsiii]

If you have your xml string in the result handler the issue is not about async
stuff. (You did do the createXML and assigned xmlDP to the dataProvider IN the
result handler, right?)

I didn't say so but you should also remove the mx:dataProvider tag from the
accountTree.

More questions/suggestions:
Does ANYTHING show up in the tree?
What does the xml string look line, exactly? In your post, you show no root
node. Is there one?
Why are you using that reference? is your result handler (and mx:RemoteObject
tag) in a sub component?
Verify that this reference is valid
"mx.core.Application.application.accountTree." add a height or width attribute
to the tree then check it in the result handler:
trace(mx.core.Application.application.accountTree. height)

[plum001]

Thanks for your help. I checked if the reference to
"mx.core.Application.application.accountTree." was valid as you suggested.
The variable was undefined. I was able to get the Tree to display by defining
a global variable to share the data between components.

What I have is a single Application.mxml file with several UI components
defined in files like TreeView.mxml and GridView.mxml. The Application.mxml
file then includes these files. The problem I was having is trying to
reference a property in the TreeView.mxml component. To work around the
problem I defined a global variable called in the Application.mxml as follows:

public var treeList:XML;

Then in my Command.onResult() method I set this global variable:

var xmlResults:XML = mx.utils.XMLUtil.createXML(result);

mx.core.Application.application.treeList = xmlResults;

Finally, in the TreeView.mxml file I refer to the global variable as my
dataProvider and now the tree is displayed correctly.

I would like to avoid global variables to share data between components. Is
there a software pattern or design that is a better method of sharing data
between components using Flex?


Thanks again,

Brett