Comments on: Locking columns in a horizontally scrolling DataGrid control

By: David

David — Tue, 26 Jul 2011 19:43:09 +0000

Hi, I’m having a strange bug when I set my locked columns dynamically. I’m using a numeric stepper to set the number. After the user changes the number the locked columns adjust on the grid as they should. However, when the user scrolls horizontally, the header row labels don’t lock, they seemingly disappear. Any idea why?

By: Vinay

Vinay — Wed, 19 May 2010 17:02:42 +0000

@ Peter,
I have filed the following bug https://bugs.adobe.com/jira/browse/SDK-26477

Thanks,
Vinay.

By: Peter deHaan

Peter deHaan — Thu, 13 May 2010 17:05:07 +0000

@Vinay,

Can you please file a bug at http://bugs.adobe.com/flex/ and attach a simple test case showing the behavior to the bug report.

Thanks,
Peter

By: Vinay

Vinay — Thu, 13 May 2010 16:55:41 +0000

Hi Peter,
Let me first tell you that you have a great website going here. I constantly refer to it if I encounter any issues related to flex. With that being said, I have an itemrenderer and an itemeditor in a datagrid whose locked column count is set to 2. Within the datagrid I have a column whose text can be longer than the column width, the itemrenderer in this case is a Label and i set its percentWidth to 100, minWidth to 0 and trucateToFit property to true. The text displays fine with … , but after I edit another column I get the error below. If I remove that column though I do not get the error. Would you have any pointers as to what the issue might be?
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.controls::DataGrid/makeRowsAndColumns()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\controls\DataGrid.as:1563]
at mx.controls.listClasses::ListBase/makeRowsAndColumnsWithExtraRows()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:1377]
at mx.controls.listClasses::ListBase/updateDisplayList()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:3722]
at mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\controls\dataGridClasses\DataGridBase.as:581]
at mx.controls::DataGrid/updateDisplayList()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\controls\DataGrid.as:1449]
at mx.controls.listClasses::ListBase/validateDisplayList()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:3344]
at mx.managers::LayoutManager/validateDisplayList()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:622]
at mx.managers::LayoutManager/doPhasedInstantiation()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:695]
at Function/http://adobe.com/AS3/2006/builtin::apply()
at mx.core::UIComponent/callLaterDispatcher2()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8744]
at mx.core::UIComponent/callLaterDispatcher()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8684]
at flash.utils::Timer/_timerDispatch()
at flash.utils::Timer/tick()

By: Arnold Aprieto

Arnold Aprieto — Tue, 18 Aug 2009 13:44:27 +0000

Sorry ’bout that. I learned that the columns with indexes that are lower than the value remain fixed in view.
Thanks.

By: Arnold Aprieto

Arnold Aprieto — Tue, 18 Aug 2009 13:38:04 +0000

Hi Peter,

Is it possible to freeze 2 or multiple columns at the same time?

Thanks,
Arnold

By: Simon Bailey

Simon Bailey — Thu, 11 Dec 2008 10:45:14 +0000

RE: “Is there a way to remove that black vertical grid line. Tried a number of ways, sounds impossible.”

Create a class as below:

package
{
    import mx.skins.halo.DataGridHeaderSeparator;

    public class DataGridHeaderSeparator extends mx.skins.halo.DataGridHeaderSeparator
    {
        override public function get measuredWidth():Number
        {
            return 0;
        }

        override public function setActualSize(newWidth:Number, newHeight:Number):void
        {
            graphics.clear();
        }
    }
}

Then in your DataGrid params use:

verticalLockedSeparatorSkin="DataGridHeaderSeparator"

That should do the trick :)

Cheers,

Simon

newtriks dot com

By: nino

nino — Wed, 29 Oct 2008 08:03:50 +0000

Is there a way to make column C on the example swf file not to resize and occupy the whole unfreeze section?

By: peterd

peterd — Thu, 06 Dec 2007 17:35:48 +0000

bing/Nikola,

I’m not sure if it works in Flex 2 (I believe it was added in Flex 3), but check out “Changing the appearance of the locked column separator skin for a DataGrid control in Flex 3″.

Peter

By: Nikola

Nikola — Wed, 05 Dec 2007 17:33:17 +0000

Tried a number of ways, sounds impossible. for me is the same what we can do ?