How to expand .NET TreeView node by clicking its text instead of +/-

Question

I've been using hardcoded hyperlinks for my web app navigation, but the app has grown since and managing it is becoming a real pain. I've decided to replace what I have with the TreeView control, however I want to make several changes to the way it looks.

Is there any property that needs to be set, that would allow user to expand the TreeView node by clicking its text instead of +/- ? I've already set ShowExpandColapse to 'false'.

I want my final result to end up as something similar to the TreeView on the left of the MSDN site.

Could anyone point me at the right direction please?

sisve · Accepted Answer · 2011-01-12 17:49:48Z

8

Set TreeNode.SelectAction to either Expand, or SelectExpand.

answered Jan 12, 2011 at 17:49

sisve

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2 Comments

Dr. Greenthumb Over a year ago

I've had no luck with this. Could it be that TreeNode.SelectAction gets fired when the +/- icon for the node gets clicked (instead of the text)? Maybe JavaScript would be a better way to go about solving this problem.

SUHAIL AG Over a year ago

@Dr.Greenthumb : Can you provide an example how to write a javascript to solve this.My requirement is Show only parent nodes by default, When user click on parent node(text itself), then show the child nodes.

Shravan Ravi · Accepted Answer · 2012-04-28 19:22:47Z

3

you can use xml data source or direct binding from db to treview

in the TreeView DataBound event we can write d recursive function as below to fetch each node and assign expand action to them.

 protected void TreeView1_DataBound(object sender, EventArgs e)
{

    foreach (TreeNode node in TreeView1.Nodes)
    {
        node.SelectAction = TreeNodeSelectAction.Expand;
        PrintNodesRecursive(node);
    }
}


    public void PrintNodesRecursive(TreeNode oParentNode)
    {


      // Start recursion on all subnodes.
     foreach(TreeNode oSubNode in oParentNode.ChildNodes)
  {
    oSubNode.SelectAction = TreeNodeSelectAction.Expand;
  PrintNodesRecursive(oSubNode);
  }
 }

edited Apr 28, 2012 at 19:22

answered Apr 28, 2012 at 19:15

Shravan Ravi

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1 Comment

eloycm Over a year ago

in this case you can use OnTreeNodeDataBound instead of recursion.... OnTreeNodeDataBound(object sender, TreeNodeEventArgs e) {e.Node.SelectAction = TreeNodeSelectAction.SelectExpand;}

MusiGenesis · Accepted Answer · 2011-01-12 16:47:53Z

0

I think you just have to do this in code: handle the Click event, determine the currently-selected tree node, and toggle its Expanded property (I think that's what it's called here).

answered Jan 12, 2011 at 16:47

MusiGenesis

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3 Comments

Dr. Greenthumb Over a year ago

I've added the following code to master page codebehind: protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e) { TreeView1.SelectedNode.SelectAction = TreeNodeSelectAction.Expand; } However the nodes are still not expanding. Must be something I'm missing here.

Dr. Greenthumb Over a year ago

Also, I was wondering how would you handle nodes that have NavigateURL as ""? They don't appear as links in the TreeView.

MusiGenesis Over a year ago

Sorry, didn't realize this was an ASP.NET question. I have no clue.

Alexander · Accepted Answer · 2011-04-16 10:27:46Z

0

You can do this only this way! http://geekswithblogs.net/rajiv/archive/2006/03/16/72575.aspx

With respect, Alexander

answered Apr 16, 2011 at 10:27

Alexander

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