tvexample.aspx.cs

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  #region Using Directives

  using System;
  using System.Collections;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Web;
  using System.Web.SessionState;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  using System.Web.UI.HtmlControls;

  using Microsoft.Web.UI.WebControls;

  #endregion Using Directives

namespace Mike.Elliott.Articles.TreeView
{
  public class TVExample : System.Web.UI.Page
  {
    protected Microsoft.Web.UI.WebControls.TreeView tvControl;

    /// <summary>
    ///   Callback invoked when the page is loaded.
    /// </summary>
    /// <param name="sender">Invoker of the callback.</param>
    /// <param name="e">An <see cref="EventArgs"/> type.</param>
    private void Page_Load( object sender, System.EventArgs e )
    {
      // Create the root tree node.
      TreeNode root = new TreeNode();
      root.Text = "Root Parent Node";
      root.NodeData = "SomeId=1000;Name=Mike Elliott";

      // Create a child node.
      TreeNode tn = new TreeNode();
      tn.Text = "Child 1 of Root Parent";
      tn.NodeData = "SomeId=1001;Name=Avyant, Inc.";

      // Add the child to the root node.
      root.Nodes.Add( tn );

      // Create another child node.
      tn = new TreeNode();
      tn.Text = "Child 2 or Root Parent";
      tn.NodeData = "SomeId=1002;Name=Chip Oxendine";
    
      // Create a grandchild node and add it to its parent.
      TreeNode cn = new TreeNode();
      cn.Text = "Grandchild of Root Parent";
      cn.NodeData = "SomeId=1003;Name=Mike Elliott";
      tn.Nodes.Add( cn );

      // Add the child to the root node.
      root.Nodes.Add( tn );
      root.Expanded = true;

      // Add all the nodes to the tree view.
      this.tvControl.Nodes.Add( root );

      this.OverRideServerEvents();
    }


    /// <summary>
    ///   Overrides the server-side events for which we want to 
    ///   handle on the client.
    /// </summary>
    private void OverRideServerEvents()
    {
      // Create and wire up the javascript event handlers.
      //
      string clickHandler = "TVIndexChanged();";
      this.tvControl.Attributes.Add( "onselectedindexchange", clickHandler );

      clickHandler = "TVNodeExpand();";
      this.tvControl.Attributes.Add( "onexpand", clickHandler );

      clickHandler = "TVNodeCollapse();";
      this.tvControl.Attributes.Add( "oncollapse", clickHandler );

      clickHandler = "TVDoubleClick();";
      this.tvControl.Attributes.Add( "ondblclick", clickHandler );

      clickHandler = "TVRightClick();";
      this.tvControl.Attributes.Add( "oncontextmenu", clickHandler );
    }

    
    #region Web Form Designer generated code

    override protected void OnInit( EventArgs e )
    {
      InitializeComponent();
      base.OnInit(e);
    }


    private void InitializeComponent()
    {    
      this.Load += new System.EventHandler( this.Page_Load );
    }

    #endregion Web Form Designer generated code
  }
}