Hi Peter,
I recently posted about a very similar issue that might be of some help. Please take a look at http://michael.omnicypher.com/2007/03/issues-with-datagrid-column-visibility .html and let me know if that does the trick. Hope this helps, Michael _____ From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of sanjaypmg Sent: Friday, March 16, 2007 1:43 PM To: flexcoders@yahoogroups.com Subject: [flexcoders] Re: Fascinating problem hiding columns in a DataGrid Hi, I have done the same using remote object but didnt face this sort of problem. I am making the columns visible/invisible on the basis of value coming frm the database... Thanks Sanjay --- In [EMAIL PROTECTED] <mailto:flexcoders%40yahoogroups.com> ups.com, "Peter Demling" <[EMAIL PROTECTED]> wrote: > > 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. <http://www.adobe.com/2006/mxml> 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> >
