As a simple approach to this I'd create an inline renderer for this
column as:
<mx:DataGridColumn headerText="Port Country">
<mx:itemRenderer>
<mx:Component>
<mx:Label text="{data.port.country}" />
</mx:Component>
</mx:itemRenderer>
</mx:DataGridColumn>
In this case the 'data' object is replicated for each row of your
collection. You can then drill down in the usual fashion to retrieve
embeded objects and their contained values. The same could be done in
an external item renderer written in mxml or actionscript.
--- In [email protected], "laidezmon" <[EMAIL PROTECTED]> wrote:
>
> OK here is what i am trying to do.
>
> I have a grid component, and I wanted to display on the grid, a list
> of ship objects. Think of this like a cruise liner.
>
> I am retrieving these objects from a java/hybernate/spring adapter
> using remote object, and it works ok. I get back an arrayCollection,
> then I build a new array, populatate it with Actionscript ship
> objects, which has an embedded port object.
>
> Ship has attributes like Name, id, comments etc. And it has an
> embedded homeport object also.
>
> The port, has name, country and comments too.
>
> I can get the object to come back, and its being built correctly. I
> have ship objects and each one has its own port object, I see in the
> debugger the objects and thier embedded objects and the embedded
> object values. So I know the constructor is working fine. Here is the
> problem.
>
> I set the dataprovider attribute to match the array of completed
> ships, and I can get the grid, to display all the ship data, but not
> the port data.
>
> So Here is my code:
>
> <mx:DataGrid id="ShipListDataGrid" width="978" height="190"
> dataProvider="{initDG}" creationComplete="loadAllShips()"
> selectedIndex="0" >
> <mx:columns>
> <mx:DataGridColumn headerText="Name" dataField="name"/>
> <mx:DataGridColumn headerText="Class" dataField="clazz"/>
> <mx:DataGridColumn headerText="Comments" dataField="comments"/>
> <mx:DataGridColumn headerText="Port Country" dataField="port.country" />
> </mx:columns>
> </mx:DataGrid>
>
> Now the colums name, clazz, comments all work perfectly, as they are
> attributes of ship. However, port.country does not work, it just shows
> a blank column, even though that is the correct notation to get to
> that data field, for the attribute of that ships port home country.
> Its just a string, so for the port called miami, the country is "USA".
> This does not display.
>
> However if I remove port.country, and only put in port, then it shows
> that whats in that column displays as Object : Port.
>
> So it seems that the grid knows theres an object in there. But not
> what to do with it?
>
> I have created a masterViewList and a masterDetails component, and the
> viewList is the grid, and the details is the details section of the
> ship. So there it shows a form, and the form shows all the details of
> the ship selected in the list above. Heres the interesting thing.
> using a label field, I can change the selected list item on the grid,
> and show the ship.port.country in a label on the bottom, so it can
> transverse the ship object, but just not seemingly in the grid.
>
> What can I do? Why does it work with a label field, and not in the
> grid? Why will the grid not show an embedded string attribute for an
> embedded object, but a label or text box will? What am I doing wrong?
>
>
> At the prompting of someone from the Flex Developer forums on adobes
> site, I implemented this also.
>
> On the column I put this as the datafield: (instead of the above
> port.country, or port)
>
> <mx:DataGridColumn headerText="Port Country"
> dataField="{calcPortCountry}" />
>
>
> And created this function:
>
> private function calcPortCountry(item:Object, col:DataGridColumn):String
> {
> return item.port.country;
> }
>
> But this also gets me the same result. Nothing inside the grid column.
> All the tutorials seem to be for passing simple objects which only
> contain simple attributes, strings ints, and stuff like that. Nothing
> with embedded objects. This is a ship object, which has an embedded
> port object inside it. I have tried debugging this new function, and I
> cannot even get into the function above to see whats being passed.
>
--
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