Nested Grid '+' sign enable/disable if no child records exits.

[Lee]

Hi
In Nested Grid, we get a '+' sign.   The problem is that '+' sign appears all times, even if there are no child records for that row.

1. Can we enable/disable OR Hide/Unhide '+' sign. depending on if child rows exits.

2. OR alteast we can put some bgcolor indicating to user that this record do have child rows.

Without any indicator user may feel quite annoying to click on '+' sign and nothing happens.

Regards
lee.

[Jack]

Hi Lee,

Please take a look at the following knowledge base article: Hide expand/collapse image in hierarchical RadGridView. It demonstrates how to hide the '+' sign for rows that have no children. I hope it helps.

All the best,
Jack
the Telerik team

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[Lee]

Thanks.

Done. It works.

[Mike]

Hi Jack,

I tried this option in my code. It is not working. I get an error in "cell.Expander". Intellisense does not have the Expander option at all.

I'm using Telerik Rad Controls version 2010.1.10.504

Kindly let me know if the following code has any changes for the control version I'm using

Kindly suggest.

Thanks
 

GridGroupExpanderCellElement cell = e.CellElement as GridGroupExpanderCellElement;
                if (cell != null && e.CellElement.RowElement is GridDataRowElement)
                {
                    if (!IsExpandable(cell.RowInfo))
                    {
                        cell.Expander.Visibility = Telerik.WinControls.ElementVisibility.Hidden;
                    }
                    else
                    {
                        cell.Expander.Visibility = Telerik.WinControls.ElementVisibility.Visible;
                    }
                }

[Alexander]

Hello Mike,

Thank you for your question.

The KB articles are up-to-date with the last version of the controls - Q2 2010. This version of RadGridView introduces the Expander element which gives the GridGroupExpanderCellElement more flexible styling capabilities.

For Q1 2010 (v2010.1.10.504) version of RadGridView you can use:

private void radGridView1_ViewCellFormatting(object sender, CellFormattingEventArgs e)
{
    GridGroupExpanderCellElement cell = e.CellElement as GridGroupExpanderCellElement;
    if (cell != null && e.CellElement.RowElement is GridDataRowElement)
    {
        bool isExpandable = IsExpandable(cell.RowInfo);

        cell.DrawSignBorder = isExpandable;
        cell.DrawSignFill = isExpandable;
        if (!isExpandable)
        {
            cell.SignImage = null;
            cell.SignStyle = GridGroupExpanderCellElement.SignStyles.Image;
        }
        else
        {
            cell.SignStyle = GridGroupExpanderCellElement.SignStyles.PlusMinus;
        }
    }
}

I hope it helps.

Best regards,
Alexander
the Telerik team

[Richard Slade]

Hi, 

I'm trying to do the same thing, and I'm also using 2010 Q1. However, I'm having issues with the IsExpandable method. RowInfo does not have a ChildRows property. Can you advise how I should re-code the isExpandable method please for the 2010 Q1 release? 
Thanks
Richard

[Alexander]

Hello Richard Slade,

Thank you for your question.

For Q1 2010 and previous versions the IsExpandable method works as follows:

private bool IsExpandable(GridViewRowInfo rowInfo)
{
    foreach (GridViewTemplate template in rowInfo.ViewTemplate.ChildGridViewTemplates)
    {
        GridViewRowInfo[] rows = template.GetChildRows(rowInfo);
        if (rows != null && rows.Length > 0)
        {
            return true;
        }
    }

    return false;
}

I hope it helps.

Regards,
Alexander
the Telerik team

[Richard Slade]

Thanks Alexander

[Felipe]

Is there a way to hide the complete column?

Becuase I expand the child when you select the parent row so I want to hide the comple column not only the image.

[Richard Slade]

Not quite sure what you mean there. If you get rid of the column you wont be able to see any of the +- symbols

[Felipe]

That's exactly what.  I want hide the column so the user can not see +/- or and empty small column cause I was able to hide the symbols but no the column.

I implemented a method to show the child rows when you do a click in any cell of the parent row.

That way is easer for the user, cause they dont have to go to specific small image to expand and unexpand the child rows.

=( I have posted 4 question in the forums never get the correct answer.

thanks,

Felipe

[Alexander]

Hello Felipe,

Please review the Jack's answer in this forum thread.

Best regards,
Alexander
the Telerik team