Chart with http data does not work

[kohinoor75]

I try to create a chart with live http data.
I cannot figure how to make the chart appear correctly.
With the same code, if I bind statically the XML generated by my servlet, it
works fine.
However, with live data, it does not. I know that my servlet is called, but I
suspect that it is called too late maybe.

Here is the code :

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.macromedia.com/2003/mxml"
initialize="retrieveData()">
<mx:HTTPService id="inventory" contentType="application/xml" method="GET"
protocol="http"
url="getInventory" fault="trace(event.fault.faultstring)"
resultFormat="object">
</mx:HTTPService>

<!-- <mx:Model id="results" source="chartdata.xml"/> -->

<mx:Script>
<![CDATA[

var objkey : String ;
var results ;

function retrieveData( )
{
inventory.url = "getInventory?objkey=" + objkey ;
inventory.send() ;
}
]]>
</mx:Script>


<mx:ColumnChart id="chart" width="100%" height="100%"
dataProvider="{inventory.result.objectClass}" showDataTips="true">

<mx:horizontalAxis>
<mx:CategoryAxis dataProvider="{inventory.result.objectClass}"
categoryField="name"/>
</mx:horizontalAxis>

<mx:series>
<mx:Array>
<mx:ColumnSeries yField="count"/>
</mx:Array>
</mx:series>

</mx:ColumnChart>
</mx:Application>

And here is XML data:

<data>
<objectClass name="File-Assignments">
<count>16430</count>
</objectClass>
<objectClass name="Phys-Files">
<count>9668</count>
</objectClass>
</data>

[ntsiii]

I don't think you can include parameters on the url. Instead, use a request
object, like this:
inventory.url = "getInventory";
inventory.send({objkey : objkey }) ;

Binding problems are difficult to debug so I always first use a reault handler
called by the data services result event. In that handler function I can rais
an alert to make sure the data callis returning and then I can inspect the
contents of the result object to verify is structure.

And once I have done that, I usually just assign the result.whatever to the
dataProvider.

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