GroupPanel

[jo]

I'm using GroupPanel for grouping and it's on the client side.I just want to limit one column at a time to group. For the second column header drag and drop should clear the first grouping and add do the second column .

[Veli]

Hello jo,

There are a couple of ways to implement this requirement. One of them is to cancel the second grouping in the GroupsChanging event of Radgrid:

void RadGrid1_GroupsChanging(object source, Telerik.Web.UI.GridGroupsChangingEventArgs e)
{
    if (e.Action == Telerik.Web.UI.GridGroupsChangingAction.Group)
    {
        if (RadGrid1.MasterTableView.GroupByExpressions.Count > 0)
            e.Canceled = true;
    }
}

The above code checks if the current event is a group event, and cancels the event if there already is a group expression set.

Another approach you can take is to disable group dragging if there is a group expression already set:

void RadGrid1_PreRender(object sender, EventArgs e)
{
    if (RadGrid1.MasterTableView.GroupByExpressions.Count > 0)
        RadGrid1.ClientSettings.AllowDragToGroup = false;
    else
        RadGrid1.ClientSettings.AllowDragToGroup = true;
}

Regards,
Veli
the Telerik team

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[Shinu]

Hi Jo,

You can try the following code snippet to clear the first grouping and add the new column in the Group panel on Drag and Drop.

CS:

 protected void RadGrid1_GroupsChanging(object source, GridGroupsChangingEventArgs e)
    {
        if (e.Action == Telerik.Web.UI.GridGroupsChangingAction.Group)
        {
            if (RadGrid1.MasterTableView.GroupByExpressions.Count > 0)
                RadGrid1.MasterTableView.GroupByExpressions.Clear();
        }
    }

Thanks
Shinu.

[jo]

thanks!