Source Code

for file /controls/TreeView.ascx

<%@ Control Language="C#" %>
<%
  // TreeView.ascx
  // Implementation of the TreeView AJAX Control.
  // Copyright (c) by Matthias Hertel, http://www.mathertel.de
  // This work is licensed under a BSD style license. See http://www.mathertel.de/License.aspx
  // ----- 
  // 03.01.2006 created by Matthias Hertel
%>
<script runat="server">
  public string title = "root";
  public string service = String.Empty;

  protected override void OnPreRender(EventArgs e) {
    base.OnPreRender(e);

    if (Page.Header == null)
      throw new Exception("The <head> element of this page is not marked with runat='server'.");

    // register the JavaScripts includes without need for a Form.
    if (!Page.ClientScript.IsClientScriptBlockRegistered(Page.GetType(), "CommonBehaviour")) {
      Page.ClientScript.RegisterClientScriptBlock(Page.GetType(), "CommonBehaviour", String.Empty);
      ((HtmlHead)Page.Header).Controls.Add(new LiteralControl("<script type='text/javascript' src='"
        + Page.ResolveUrl("~/controls/jcl.js")
        + "'><" + "/script>\n"));
    } // if

    if (!Page.ClientScript.IsClientScriptBlockRegistered(this.GetType(), "MyBehaviour")) {
      Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "MyBehaviour", String.Empty);
      ((HtmlHead)Page.Header).Controls.Add(new LiteralControl("<script type='text/javascript' src='"
        + Page.ResolveUrl("~/controls/TreeView.js")
        + "'><" + "/script>\n"));
    } // if

  } // OnPreRender
</script>
<!-- Here comes the HTML code that builds the Control. -->
<div id="<%=this.ClientID %>" class="TreeView" style="background-color: #cccccc"
  service="<%=this.service %>">
  <div class="du" name="/">
    <span class="ft">
      <%=this.title %>
    </span>
  </div>
  <div class="subframe" style="display: none">
    <div class='fl'>
    </div>
  </div>
</div>
<!-- Here comes the script code to bind the behaviour. -->
<script defer="defer" type="text/javascript">
  jcl.LoadBehaviour("<%=this.ClientID %>", TreeViewBehaviour);
</script>
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For updates and discussions see http://ajaxaspects.blogspot.com/.