Expand/Collapse groups

[Chris Thierry]

Hi,
Is there a possibility to collapse/expand a group level in radgridview UI ?
example: radgridview grouped by date
2010/01/01
    row1
    row2
    row3
2010/01/02
    row4
    row5
    row6
    row7
I want to collapse the date group and have the view below without having to click on both 2010/01/01 and 2010/02/02 ?
2010/01/01
2010/01/02


Thanks

[Milan]

Hello Chris Thierry,

So far we have exposed two method that allow you to expand/collapse groups programmatically. The first one is called ExpandGroup and the second one is called CollapseGroup and they can be used as follows:

// to expand the second group
this.gridView.ExpandGroup(this.gridView.Items.Groups[1] as IGroup);

// to collapse the first group
this.gridView.CollapseGroup(this.gridView.Items.Groups[0] as IGroup);

To have the first two groups expanded you can subscribe to the Grouped event of RadGridView and use the ExpandGroup method:

void gridView_Grouped(object sender, Telerik.Windows.Controls.GridViewGroupedEventArgs e)
{
    // expand first two groups
    this.gridView.ExpandGroup(this.gridView.Items.Groups[0] as IGroup);
    this.gridView.ExpandGroup(this.gridView.Items.Groups[1] as IGroup);
}

Kind regards,
Milan
the Telerik team

[Gerald]

I tried subscribing to the "Grouped" event but it didn't fire when the grid was loaded. It only seems to fire when I manually add groups.

I have two groups that I add programatically and I would like them to be expanded by default. Is there any way to do this?

[Milan]

Hello Gerald,

The Grouped event would only be called if the operation is initiated from the UI. If you are adding the group descriptors before the grid is shown you can try the following approach. 

public MainPage()
{
    InitializeComponent();

    this.playersGrid.GroupDescriptors.Add(new GroupDescriptor() { Member = "Name" });
    this.playersGrid.DataLoaded += new EventHandler<EventArgs>(playersGrid_DataLoaded);

}

void playersGrid_DataLoaded(object sender, EventArgs e)
{
    if (this.playersGrid.Items.Groups.Count > 0)
    {
        // expand first two groups
        this.playersGrid.ExpandGroup(this.playersGrid.Items.Groups[0] as IGroup);
        this.playersGrid.ExpandGroup(this.playersGrid.Items.Groups[1] as IGroup);
    }

    this.playersGrid.DataLoaded -= new EventHandler<EventArgs>(playersGrid_DataLoaded);
}

If the descriptors are added after the grid is shown (on button click, for instance) you can simply use ExapndGroup right after the descriptors are added.

Hope this helps.

Kind regards,
Milan
the Telerik team

[pat]

I am having problems with the selective grouping.  If I check the number of groups using gridIn.GroupCount I get 3 which is what I would expect as I have added 3 groups programatically (gridIn.GroupDescriptors.Add(groupDesc)).

But when I try and collapse a group

gv.CollapseGroup(gv.Items.Groups[currentGoupingLevel] as IGroup);

It fails.  If I check gv.Items.Groups.Count() it shows as 1 not three.

if I try

gv.CollapseGroup(gv.Items.Groups[0] as IGroup);

it simply collapses all 3 levels of detail.

What I am trying to do is have a button that collapses the grouping one group at a time.

Can you please tell me what I am missing and why gridIn.GroupCount shows as 3 but gv.Items.Groups.Count() shows as 1

Thanks,

PatC