[flexcoders] Keeping DataGrid from scrolling to top on update to dataProvider

Chaitu Vadlapatla Mon, 07 Aug 2006 19:20:25 -0700

Hi Jordan,

I think i see what you mean. I added some changes to the code posted below. now my scroll stays at the previous position but throws an error when i try to scroll to the top and also has lots of blank rows of data. is this some sort of bug?

public var listScrollPosition:Number = 0;

public function rememberDGPosition(){
   listScrollPosition = devicesListViewGrid.verticalScrollPosition;
   }

public function loaded(){

gateway.call( "DBDeviceManager.getPage5", new Responder(onResult, onFault),userid);
}

public function onResult(result:Array):void{
abcd = result;

      devicesListViewGrid.verticalScrollPosition = listScrollPosition ;
       intervalIdList = setInterval(loaded, durationList);
   }

++++++++++++++++++++++++++++

render="rememberDGPosition()" >

     <mx:columns>
     <mx:DataGridColumn width="50" id="datagridcolumn" headerText=" " itemRenderer="CheckCellRenderer"/>
     <mx:DataGridColumn headerText="NAME" dataField="name" itemRenderer="CheckBoxRenderer"/>

      <mx:DataGridColumn width="140" headerText="CURRENT STATUS" dataField="pmid" itemRenderer="chartPivot"/>

      <mx:DataGridColumn editable="false" width="90" headerText="DURATION" dataField="duration" itemRenderer="DurationRenderer"/>
      <mx:DataGridColumn editable="false" width="110" headerText="LAST CHANGE" dataField="lastchange" itemRenderer="lasChangeRenderer"/>
      <mx:DataGridColumn editable="false" width="100" headerText="PREVIOUS STATUS" dataField="previousstatus" itemRenderer="previousStateRenderer"/>
      <mx:DataGridColumn editable="false" headerText="GROUP" dataField="group" itemRenderer="groupRenderer"/>


     </mx:columns>
    </mx:DataGrid>

From: Chaitu Vadlapatla
Sent: Sun 8/6/2006 10:46 PM
To: [EMAIL PROTECTED]
Cc: Wade Arnold
Subject: Keeping DataGrid from scrolling to top on update to dataProvider

Hi Jordan,

I am very sorry to contact you off the list. But I am kind of desperate for a solution to the same problem that you had before with the datagrid not remembering the scroll position just before it was refreshed. I followed some of your discussion and was able to even see that if the vertical scroll position was set it had a set of rows which were blank. I saw your last post where you were able to override it with a rememberDGPosition() on the DG's renderer event. I am kind of lost at this point. could you please point to me where i am supposed to insert the "rememberDGPosition()". Could you please help me. I really appreciate it.

My code for the datagrid looks like this

public function loaded(){

gateway.call( "DBDeviceManager.getPage5", new Responder(onResult, onFault),userid);
}

   public function onResult(result:Array):void{
       abcd = result;
       intervalIdList = setInterval(loaded, durationList);
   }

++++++++++++++++++++++++++++

<mx:DataGrid x="10" y="3" verticalGridLines="false" useRollOver="false" id="devicesListViewGrid" dataProvider="{abcd}" width="704" height="392" mouseDownEffect="none" selectionColor="#CDF3DD" rollOverColor="#013826" alternatingItemColors="[#FFFFFF,#E1F5E8]" headerColors="[#006E4F,#006E4F]" borderStyle="solid" horizontalGridLineColor="#BAE2CA" verticalGridLineColor="#BAE2CA" horizontalGridLines="true" borderColor="#BAE2CA" color="#FFFFFF" sortableColumns="false" >

     <mx:columns>
     <mx:DataGridColumn width="50" id="datagridcolumn" headerText=" " itemRenderer="CheckCellRenderer"/>
     <mx:DataGridColumn headerText="NAME" dataField="name" itemRenderer="CheckBoxRenderer"/>

      <mx:DataGridColumn width="140" headerText="CURRENT STATUS" dataField="pmid" itemRenderer="chartPivot"/>

      <mx:DataGridColumn editable="false" width="90" headerText="DURATION" dataField="duration" itemRenderer="DurationRenderer"/>
      <mx:DataGridColumn editable="false" width="110" headerText="LAST CHANGE" dataField="lastchange" itemRenderer="lasChangeRenderer"/>
      <mx:DataGridColumn editable="false" width="100" headerText="PREVIOUS STATUS" dataField="previousstatus" itemRenderer="previousStateRenderer"/>
      <mx:DataGridColumn editable="false" headerText="GROUP" dataField="group" itemRenderer="groupRenderer"/>


     </mx:columns>
    </mx:DataGrid>

-------------------------------------------------------------------------------------------------------

MMMMK Everyone,

I got it to work by calling the "rememberDGPosition()" on the DG's render event. So that worked for the scroll position and fixed the above bug. I can only assume that my earlier solution was setting the scroll position before the dataProvider registered an update.

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[flexcoders] Keeping DataGrid from scrolling to top on update to dataProvider

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