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Lose Expand value when using SwapColumns

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Grid
This is a migrated thread and some comments may be shown as answers.
Todd A
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Todd A asked on 21 May 2010, 10:11 PM
See code below.

The SwapColumns works in all cases.

The expand logic for the group works when the swap columns does not occur.

When the swap columns logic does occur, I loose the expand value and everything is expanded.

Any ideas would be greatly appreciated.

Thanks,
Todd.

 

    protected void ScheduleGrid_PreRender(object sender, EventArgs e)  
    {  
        //Swap  
        if (divisionObj.SwapHomeAndAway)  
            ScheduleGrid.MasterTableView.SwapColumns("Home", "Away");  
 
        //Expand/Collapse groups  
        ArrayList groupItems = new ArrayList(ScheduleGrid.MasterTableView.GetItems(GridItemType.GroupHeader));  
          
        foreach (GridGroupHeaderItem item in groupItems)  
        {  
            bool expanded = false;  
 
            ArrayList childItems = new ArrayList(item.GetChildItems());  
 
            foreach (GridItem child in childItems)  
            {  
                RadComboBox rcb = (RadComboBox)child.FindControl("DispositionComboBox");  
 
                if (rcb != null && rcb.SelectedValue != "")  
                {  
                    if (Convert.ToInt32(rcb.SelectedValue) == DispositionTypes.PENDING)  
                    {  
                        expanded = true;  
                        break;  
                    }  
                }  
 
            }  
 
            item.Expanded = expanded;  
        }  
 
    } 

 

 

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Martin
Telerik team
answered on 27 May 2010, 12:12 PM
Hello Todd A,

Please note that the SwapColumns() method rebinds the grid. Since the expanded state of the group header items is not persisted in the viewstate and the GroupsDefaultExpanded="true" (the default value) then the items would always be expanded after you call that method.

To workaround this behavior you have to save the state of the group header items when you expand / collapse them and reapply that state after the grid is rebound. I have attached a small sample project that demonstrates this approach. Please give it a try and let me know if further assistance is needed.

Regards,
Martin
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Todd A
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answered on 27 May 2010, 05:09 PM
Thanks Martin for the sample -- I will try it out.
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Todd A
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