[Solved] Epand all tree nodes

[Kian Cha]

Hi,

I tried to get the tree to expand all nodes on initial page load, but couldn't get any of the supported Expand methods to work. What was missing?

Try #1 failed.
==========
    private void Page_Load(object sender, System.EventArgs e)
    {
        if (!IsPostBack)
            RadTreeView.ExpandAllNodes();  
     }

Try #2 failed
==========
    private void Page_Load(object sender, System.EventArgs e)
    {
        if (!IsPostBack)
             ExpandAllTreeNodes(RadTreeView1.Nodes);
    } 

    private void ExpandAllTreeNodes(RadTreeNodeCollection nodes)
    {
        foreach (RadTreeNode node in nodes)
        {
            node.Expanded = true;
            ExpandAllTreeNodes(node.Nodes);
        }
    }

Try #3 failed
=========
    private void Page_Load(object sender, System.EventArgs e)
    {
        if (!IsPostBack)
             ExpandAllTreeNodes(RadTreeView1.Nodes);
    }

    private void ExpandAllTreeNodes(RadTreeNodeCollection nodes)
    {
        foreach (RadTreeNode node in nodes)
        {
            node.ExpandChildNodes();
        }
    }

Thanks.

[Atanas Korchev]

Hello Kian Cha,

Please try the following:
    RadTreeView1.ExpandAllNodes(); 

where RadTreeView1 is the ID of your RadTreeView.

Regards,
Albert
the Telerik team

Instantly find answers to your questions at the new Telerik Support Center

[Kian Cha]

Hi,

This is a copy and paste error, try #1 should say "RadTreeView1.ExpandAllNodes().

Please node that the code wouldn't have compiled if it was RadTreeView.ExpandAllNodes().

Thanks.

Kian

[Atanas Korchev]

Hi Kian Cha,

I have tried the ExpandAll code in our online examples and it worked without a glitch so the problem must be elsewhere. Could you give us more details about your scenario? For example how do you populate the treeview? Do you use load on demand?

Regards,
Albert
the Telerik team

Instantly find answers to your questions at the new Telerik Support Center

[Fero]

In case that you use XmlDataSource control to bind data into TreeView.

This won't work.

protected

void Page_Load(object sender, EventArgs e)
{

RadTreeView1.ExpandAllNodes();

}

Use this insted.

You can more advanced settings on that event

protected

void HandleNodeBound(object o, Telerik.WebControls.RadTreeNodeEventArgs e)

{

e.NodeBound.Expanded =

true;

}