How To Select Grouped Rows / Header Values?

[Jason_G]

HI,
can't find the answer to this anywhere so hope you can help.

I want to programatically expand a group when the user clicks on the group header (not just on the expand icon/button) and subsequently select all the rows in the group (multiselect is true already.)
I know I can use Groups[0].Expand() and use the Rows collection, but I can't find any way to get the index of the group when the user clicks on the group header.

I can detect that the user has selected a group header row by checking the type of the CurrentRow or using e.CurrentRow in CurrentRowChanged, but can't get any further.

I also want to get a value from the group header - e.g. if the GroupByExpression groups on CustomerName, how do I find the value of CustomerName when the user selects a Group Header row?

Many Thanks,
Jason

[Martin Vasilev]

Hi Jason_G,

A possible implementation for the described scenario is to use MouseDown event and GetElementAtPoint method. Please, consider the following code-block as an example:

void radGridView1_MouseDown(object sender, MouseEventArgs e)
{
    GridCellElement cellElement = this.radGridView1.ElementTree.GetElementAtPoint(e.Location) as GridCellElement;
    if (cellElement != null && !(cellElement is GridGroupExpanderCellElement) && cellElement.Parent is GridGroupHeaderRowElement)
    {
        GridGroupHeaderRowElement groupRow = (GridGroupHeaderRowElement)cellElement.Parent;
        ((GridViewGroupRowInfo)groupRow.RowInfo).Group.Expand();
        object value = ((GridViewGroupRowInfo)groupRow.RowInfo).Group.Aggregates[0].Value;
        GridViewRowInfo[] childRows = ((GridViewGroupRowInfo)groupRow.RowInfo).Group.GetRows();
        foreach (var row in childRows)
        {
            row.IsSelected = true;
        }

        RadMessageBox.Show(String.Format("\"{0}\" has expanded and its child rows are selected", value));
    }
}

 

I hope this helps. Do not hesitate to contact me again if you have other questions.

Regards,
Martin Vasilev
the Telerik team

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