Lots of hidden column, column resize issues were fixed in an update due out soon.
________________________________ From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Peter Demling Sent: Friday, March 16, 2007 8:24 AM To: flexcoders@yahoogroups.com Subject: [flexcoders] Fascinating problem hiding columns in a DataGrid While a problem for me, I find the following behavior fascinating and inexplicable; so here's a good challenge for any Flexlock Holmes out there (full code is below - 26 lines, fairly simple): I have a DataGrid that's using a RemoteObject as its dataProvider, and I initialize the 'visible' propery of its first dataGridColumn to "false". On startup, this column (labelled "Name") is hidden - so far, so good. Next I click my "GetData" button to invoke the RemoteObject's service, and poof! The column becomes visible - even though the debugger verified that its visible property remains false! So now I click my "HideName" Button, which forcibly sets the visible property of this "Name" column to false. The debugger verifies that its false before I click it, and its false after I click it. Still, the column remains visible. So just for the heck of it I click my "ShowName" Button, which forcibly sets the visible property of the "Name" column to true. The debugger verifies that the value is changed to true - and as an added bonus, it increases the width of the Name column from 50 to 100! Okay... Finally, I click the "HideName" Button, and *this* time it works - the Name column is now hidden, having worked only after I forced its visible prpoerty to true immediately beforehand. I can replicate this ad nauseum (calling the RemoteObject service makes the hidden column visible without setting visible to true; forcing the visible value to false works only after forcing it to true), but it only happens when the dataProvider is remoteObject, and the forcing of the visible value only shows the column when done via Buttons (it does not work directly in code right after calling the RemoteObject service). Full code is below. I tracked every single Name column variable through the debugger, and nothing changes, except for visible and width as noted above. I did track down the moment that the "ShowName" button expands the column width (in Button.as, line 2050, function focusOutHandler), but I don't know enough about Flex yet to know why that would enable column hiding; or why the call to RemoteObject is revealing my invisible column in the first place, for that matter. Started out just wanting to hide some DataGrid columns, but went pretty far down the rabbit hole. Thanks for any input! -Peter Demling Lexington, MA <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml <http://www.adobe.com/2006/mxml> " layout="absolute"> <mx:RemoteObject id="srv" destination="employees"/> <mx:DataGrid id="myDataGrid" dataProvider="{srv.getEmployees.lastResult}"> <mx:columns> <mx:DataGridColumn visible="false" headerText="Name" dataField="name" /> <mx:DataGridColumn headerText="Group" dataField="group"/> </mx:columns> </mx:DataGrid> <mx:Button label="Get Data" click="srv.getEmployees();" x="10" y="170"/> <mx:Button label="Hide name column" click="myDataGrid.columns[0].visible=false;" y="230" x="10"/> <mx:Button label="Show name column" click="myDataGrid.columns[0].visible=true;" y="200" x="10"/> </mx:Application>
