TreeList first cell columnspan problem

[Attila]

Hello.

I have dinamically created a treeList. I add a new header item and I want the first cell to be merged with the following cells. Even if I set colspan to the cell, after rendering in page, the cell will always have colspan 2.

// Initialize the first header
var headerItemGrayLine = new TreeListHeaderItem(RadTreeListLocations, TreeListItemType.HeaderItem, false);

// Adding cells
headerItemGrayLine.Cells.Add(new TreeListTableHeaderCell { ColumnSpan = 13, Height = 50, BackColor = LocationColor, BorderWidth = 0});

for (int i = 1; i < 13; i++)
{
  headerItemGrayLine.Cells.Add(new TreeListTableHeaderCell { ColumnSpan = 0, Height = 50, BackColor = LocationColor, BorderWidth = 0, Visible = false });

}

What am I missing? I attach a picture to see better what is the problem.

Thank you,

[Antonio Stoilkov]

Hi Daniel,

Thank you for contacting us.

You could achieve your scenario by inserting a hidden dummy first cell so the column span will be applied on the first cell invisible cell.

// Initialize the first header
var headerItemGrayLine = new TreeListHeaderItem(RadTreeList1, TreeListItemType.HeaderItem, false);

TreeListTableHeaderCell cell = new TreeListTableHeaderCell();
cell.Style.Add(HtmlTextWriterStyle.Display, "none");
headerItemGrayLine.Cells.Add(cell);
// Adding cells
headerItemGrayLine.Cells.Add(new TreeListTableHeaderCell { ColumnSpan = 13, Height = 50, BackColor = Color.Aqua, BorderWidth = 0 });
for (int i = 1; i < 13; i++)
{
    headerItemGrayLine.Cells.Add(new TreeListTableHeaderCell { ColumnSpan = 0, Height = 50, BackColor = Color.Red, BorderWidth = 0, Visible = false });
}

All the best,
Antonio Stoilkov
the Telerik team

[Attila]

Hello,

I implemented this solution. Now, when I expand the tree, the header is missing columns at the end. I guess I need to adjust the column span by the level of expansion of the tree. How can I find this level?

Thank you

[Antonio Stoilkov]

Hi Daniel,

You could find the expansion level by using the code provided below. The idea is to get the max NestedLevel from the RadTreeList Items.

int expansionLevel = this.RadTreeList1.Items.Max(i => (i as TreeListDataItem).HierarchyIndex.NestedLevel);

All the best,
Antonio Stoilkov
the Telerik team