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Traversing GroupHeaderItems in PreRender

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Craig
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Craig asked on 17 Mar 2009, 09:16 PM
Can anyone please help me with how to traverse and change the GroupHeaderItems in the PreRender event.  I know how to do this in the ItemDataBount event with the below code, but this won't work because everytime a user closes a grouping the changes I make to the groupheaderitem go away.

if (e.Item is GridGroupHeaderItem)  
        {  
            GridGroupHeaderItem item = e.Item as GridGroupHeaderItem;  
            string grpIndx = item.GroupIndex.ToString();  
 
            if (grpIndx.Length >= 5)  
            {  
                if (grpIndx.Substring(grpIndx.Length - 2) == "_0")  
                {  
                    DataRowView groupDataRow = (DataRowView)e.Item.DataItem;  
 
                    // Make sure a project exists by checking the Project Id group value  
                    if (string.IsNullOrEmpty(groupDataRow.Row["ProjectId"].ToString()))  
                    {  
                        // Hide the Project grouping  
                        item.Visible = false;  
                    }  
                    else  
                    {  
                        if (groupDataRow.Row["ReleasedByProject"].ToString().ToUpper() != "TRUE") // (!ois.ReleasedByProject)  
                        {  
                            HyperLink lnk = new HyperLink();  
                            lnk.ID = "btnProjRelease";  
                            lnk.Text = "Click To Release";  
                            lnk.ToolTip = "Project Release";  
                            lnk.NavigateUrl = "#";  
                            lnk.Attributes["onclick"] = string.Format("return RunProjectRelease('{0}');", groupDataRow.Row["ProductId"].ToString());  
                            lnk.Enabled = _isReleasedByAccounting && _canCompleteSteps;  
 
                            Label lbl = new Label();  
                            lbl.Text = string.Format("Project: {0}:  ", groupDataRow.Row["ProjectName"].ToString());  
 
                            item.DataCell.Controls.Add(lbl);  
                            item.DataCell.Controls.Add(lnk);  
                        }  
                    }  
                }  
            }  
        } 

10 Answers, 1 is accepted

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Shinu
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answered on 18 Mar 2009, 03:45 AM
Hi Craig,

Try the following approach to loop through the Group header in the PreRender event.

CS:
 protected void RadGrid1_PreRender(object sender, EventArgs e) 
    { 
        foreach (GridGroupHeaderItem groupHeader in RadGrid1.MasterTableView.GetItems(GridItemType.GroupHeader)) 
        { 
            string grpIndx = groupHeader.GroupIndex.ToString();   
            //... 
        } 
        
    } 


Thanks
Shinu
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Princy
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answered on 18 Mar 2009, 03:49 AM

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Craig
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answered on 18 Mar 2009, 04:05 PM
Thanks for your reply Shinu.  Your suggestion worked great during the initial loading of the screen.  However, whenever an AJAX request is sent back and the pre-render runs again the DataItem of the groupHeader is NULL.  Is there a way around this?  I need to access the data of the groupheader so I can determine what to put in the groupheader.

Thanks
0
Iana Tsolova
Telerik team
answered on 20 Mar 2009, 08:30 AM
Hello Craig,

Indeed, the DataItem property is available only during data binding. You can access/use it in the ItemDataBound event if it works for you. On RadGrid PreRender, you can get only the text of the GridGroupHeader.

Regards,
Iana
the Telerik team


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Craig
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answered on 20 Mar 2009, 08:14 PM
Iana -

Thanks for the response.  Since the dataitem is not accessible during the prerender event of rad grid how would you suggest I customize the group header item?  I am trying to create a custom link in the group header item that is dependant on the data.  I can put it in the itemdatabound event and it works great, except whenever an ajax even fires then it goes away.  So I read on other forums to put it in the prerender event, except I can't get access to the dataitem.  Any suggestions?

Is there a way to not allow the expanding / collapsing of group sections?

Thanks
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Raj
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answered on 20 Mar 2009, 08:53 PM

Hi Craig,

 

I have done a similar app and able to access the DataItem in pre-render :

Here's the code extract:

 

 

 

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Craig
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answered on 20 Mar 2009, 08:58 PM
Raj -

I am very interested in your code but can't read it.  Can you please re-post it using the format code block thing so it is copied cleanly?

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Accepted
Raj
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answered on 20 Mar 2009, 08:58 PM
sorry, messed up with Format Code Block ,
pasting it again:

 

protected void rgrdBudgetData_PreRender(object sender, EventArgs e)

 

{

 

    foreach (GridGroupHeaderItem grpHdrItem in rgrdBudgetData.MasterTableView.GetItems(GridItemType.GroupHeader))

    {

 

         Double grpProjCost = 0.0; 
 

 

        TraverseGridGroup(grpHdrItem,

out grpProjCost, out grpAdjAmt, out grpProjValue, out grpBudgetVar);

 

 

        TableCell cell = new TableCell();

 

         cell.ColumnSpan = 1;

        cell.Text = grpProjCost.ToString(

"C");

 

         grpHdrItem.Cells.Add(cell);

    }

}

 

 

void TraverseGridGroup(GridGroupHeaderItem grpHdrItem,out Double grpProjCost,out Double grpAdjAmt,out Double grpProjValue,out Double grpBudgetVar)

{

    grpProjCost = 0.0;

 

 

    GridItem[] children = grpHdrItem.GetChildItems();

     

foreach (GridItem item in children)

 

     {

 

        if (item is GridGroupHeaderItem)

 

        {

             

Double subgrpProjCost = 0.0;

 

             

GridGroupHeaderItem subgrpHdrItem = item as GridGroupHeaderItem;

 

             TraverseGridGroup(subgrpHdrItem,

out subgrpProjCost, out subgrpAdjAmt, out subgrpProjValue, out subgrpBudgetVar);

 

             grpProjCost += subgrpProjCost;

        }

         

else if (item is GridDataItem)

 

         {

             

GridDataItem dataItem = item as GridDataItem;

 

             

DataRowView dRow = dataItem.DataItem as DataRowView;

 

             

Double revBudget = ConvertDB.ToDouble(dRow["REVISEDBUDGET"]);

 

             revBudget = revBudget ==

Double.MinValue ? 0 : revBudget;

 

             

Double ytdExpense = ConvertDB.ToDouble(dRow["YTDEXPENSE"]);

 

             ytdExpense = ytdExpense ==

Double.MinValue ? 0 : ytdExpense;

 

             

Double encumbrance = ConvertDB.ToDouble(dRow["Z_NET_ENC_BAL"]);

 

             encumbrance = encumbrance ==

Double.MinValue ? 0 : encumbrance;

 

             

Double totalExpense = ytdExpense + encumbrance;

 

             

Double projValue = 0.0;

 

             

if(!ConvertDB.ToBoolean(dRow["NoProjection"]))

 

             {

                 

if (ConvertDB.ToBoolean(dRow["ProjectByMonth"]))

 

                 {

                    projValue = totalExpense / 12 * ProjectionFactor;

                }

                 

else

 

                 

{

 

                    projValue = (totalExpense / PayPeriodsYTD) * (TotalPeriodsInYear - PayPeriodsYTD);

                }

            }

             

Double adjProjAmount = ConvertDB.ToDouble(dRow["AdjAmount"]);

 

            adjProjAmount = adjProjAmount ==

Double.MinValue ? 0 : adjProjAmount;

 

             

Double totalProjValue = 0.0;

 

             totalProjValue = totalExpense + projValue + adjProjAmount;

             

grpProjValue += totalProjValue;

 

        }

    }

}

 



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Craig
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answered on 08 Apr 2009, 06:02 PM
I have figured out the best way to do this.  Attached is the code for both the Pre-Render and the traverse group header function.  This works for initial page load and all ajax call backs.

protected void grdInitialInput_PreRender(object sender, EventArgs e)  
    {  
        foreach (GridGroupHeaderItem item in grdInitialInput.MasterTableView.GetItems(GridItemType.GroupHeader))  
        {  
            string grpIndx = item.GroupIndex.ToString();  
            if (grpIndx.Length >= 5)  
            {  
                if (grpIndx.Substring(grpIndx.Length - 2) == "_0")  
                {  
                    GridDataItem dtaItem = TraverseGridGroupForDataItem(item);  
 
                    if (dtaItem != null)  
                    {  
                        HyperLink lnk = new HyperLink();  
                        lnk.ID = "lnkAccountCreditScreen";  
                        lnk.Text = "Change Accounting Limits";  
                        lnk.NavigateUrl = "#";  
                        lnk.Attributes["onclick"] = string.Format("return ShowAccountCreditScreen('{0}', '{1}');", dtaItem["AccountId"].Text, lnk.ClientID);  
 
                        item.DataCell.Controls.Add(lnk);  
                    }  
                }  
            }  
        }  
    }  
 
    private GridDataItem TraverseGridGroupForDataItem(GridGroupHeaderItem grpHdrItem)  
    {  
        GridDataItem dataItem = null;  
 
        foreach (GridItem item in grpHdrItem.GetChildItems())  
        {  
            if (item is GridGroupHeaderItem)  
            {  
                GridGroupHeaderItem subgrpHdrItem = item as GridGroupHeaderItem;  
 
                TraverseGridGroupForDataItem(subgrpHdrItem);  
            }  
            else if (item is GridDataItem)  
            {  
                dataItem = item as GridDataItem;  
            }  
        }  
 
        return dataItem;  
    } 
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Jason
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answered on 08 Jul 2009, 01:34 AM
protected void rgrdBudgetData_PreRender(object sender, EventArgs e) 
    foreach (GridGroupHeaderItem grpHdrItem in rgrdBudgetData.MasterTableView.GetItems(GridItemType.GroupHeader)) 
    { 
        Double grpProjCost = 0.0;  
 
        TraverseGridGroup(grpHdrItem, out grpProjCost, out grpAdjAmt, out grpProjValue, out grpBudgetVar); 
 
        TableCell cell = new TableCell(); 
        cell.ColumnSpan = 1; 
        cell.Text = grpProjCost.ToString("C"); 
        grpHdrItem.Cells.Add(cell); 
    } 
 
void TraverseGridGroup(GridGroupHeaderItem grpHdrItem,out Double grpProjCost,out double grpAdjAmt,out Double grpProjValue,out Double grpBudgetVar) 
    grpProjCost = 0.0; 
 
    GridItem[] children = grpHdrItem.GetChildItems(); 
 
    foreach (GridItem item in children) 
    { 
        if (item is GridGroupHeaderItem) 
        { 
            Double subgrpProjCost = 0.0; 
            GridGroupHeaderItem subgrpHdrItem = item as GridGroupHeaderItem; 
            TraverseGridGroup(subgrpHdrItem, out subgrpProjCost, out subgrpAdjAmt, out subgrpProjValue, out subgrpBudgetVar); 
            grpProjCost += subgrpProjCost; 
        } 
        else if (item is GridDataItem) 
        { 
            GridDataItem dataItem = item as GridDataItem; 
            DataRowView dRow = dataItem.DataItem as DataRowView; 
 
            Double revBudget = ConvertDB.ToDouble(dRow["REVISEDBUDGET"]); 
            revBudget = revBudget == Double.MinValue ? 0 : revBudget; 
            Double ytdExpense = ConvertDB.ToDouble(dRow["YTDEXPENSE"]); 
            ytdExpense = ytdExpense == Double.MinValue ? 0 : ytdExpense; 
            Double encumbrance = ConvertDB.ToDouble(dRow["Z_NET_ENC_BAL"]); 
            encumbrance = encumbrance == Double.MinValue ? 0 : encumbrance; 
            Double totalExpense = ytdExpense + encumbrance; 
            Double projValue = 0.0; 
 
            if(!ConvertDB.ToBoolean(dRow["NoProjection"])) 
            { 
                if (ConvertDB.ToBoolean(dRow["ProjectByMonth"])) 
                { 
                     projValue = totalExpense / 12 * ProjectionFactor; 
                } 
                else 
                { 
                     projValue = (totalExpense / PayPeriodsYTD) * (TotalPeriodsInYear - PayPeriodsYTD); 
                } 
            } 
 
            Double adjProjAmount = ConvertDB.ToDouble(dRow["AdjAmount"]); 
            adjProjAmount = adjProjAmount == Double.MinValue ? 0 : adjProjAmount; 
 
            Double totalProjValue = 0.0; 
            totalProjValue = totalExpense + projValue + adjProjAmount; 
            grpProjValue += totalProjValue; 
        } 
    } 
 

Thought I'd try to make this easier to read :)
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Asked by
Craig
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Shinu
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Princy
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Craig
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Iana Tsolova
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Raj
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Jason
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