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How To Populate an ActiveX TreeView Control Using ASP

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Summary

This article describes how to use Active Server Pages (ASP) code to populate an ActiveX TreeView control. The technique shown here leverages ASP's ability to dynamically build a VBScript function to populate a client-side ActiveX control, based on results retrieved through ActiveX Database Objects (ADO).

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More information

The following example uses ASP code to populate an ActiveX TreeView control. This sample uses the Pubs sample database provided with Microsoft SQL Server. You need to create a data source name (DSN) called PUBS on your Web server that points to the Pubs database to run this sample.

This code demonstrates how ASP uses ADO to execute a SELECT statement that retrieves a list of authors and their associated book titles. The result is a TreeView control that lists the authors as parent nodes of the control while the corresponding book titles appear as child nodes.

Sample Code

   <%@ LANGUAGE="VBSCRIPT" %>

   <HTML>
   <HEAD>
   <META HTTP-EQUIV="Content-Type" content="text/html; charset=iso-8859-1">
   <TITLE>Sample Tree Control</TITLE>
   </HEAD>
   <BODY>
   <OBJECT ID="TreeView1" WIDTH=300 HEIGHT=400
    CLASSID="CLSID:0713E8A2-850A-101B-AFC0-4210102A8DA7">
       <PARAM NAME="_ExtentX" VALUE="7938">
       <PARAM NAME="_ExtentY" VALUE="10583">
       <PARAM NAME="_Version" VALUE="327682">
       <PARAM NAME="LineStyle" VALUE="1">
       <PARAM NAME="Style" VALUE="6">
       <PARAM NAME="Appearance" VALUE="1">
   </OBJECT>

   <SCRIPT LANGUAGE="VBScript">
      TreeView1.Font.Name = "Arial"
      TreeView1.Font.Size = 10

   <%
   '************ Construct SQL Statement ******************************

    sSQL = "SELECT authors.au_id, authors.au_fname + ' ' +
    authors.au_lname as 'author', titles.title"
      sSQL = sSQL & " FROM authors"
      sSQL = sSQL & " JOIN titleauthor ON authors.au_id=titleauthor.au_id"
      sSQL = sSQL & " JOIN titles ON titleauthor.title_id =
    titles.title_id"
      sSQL = sSQL & " ORDER BY authors.au_lname, authors.au_fname,
    authors.au_id, titles.title"


   '************ Create Connection and Recordset **********************

      Set cnnPubs = Server.CreateObject("Adodb.connection")
      cnnPubs.open "DSN=pubs", "sa" 'Point to a DSN called PUBS.
      Set rstAuthorsTitles = Server.CreateObject("adodb.recordset")
      Set rstAuthorsTitles = cnnPubs.execute(sSQL)


   '************ Populate the Control ******************************

      Dim sTmpAuthorId
      sTmpAuthorId = ""
      Do While Not rstAuthorsTitles.EOF 'Check for end of recordset.
         If rstAuthorsTitles(0) <> sTmpAuthorId Then 'Check for empty or
                                                     'the same author_id.
            Response.Write "TreeView1.Nodes.Add , , " & Chr(34) &_
               rstAuthorsTitles(0) & Chr(34) & "," & Chr(34) &_
               rstAuthorsTitles(1) & Chr(34) & chr(10) & chr(13)
      'Add author to root node.
            sTmpAuthorId = rstAuthorsTitles(0)
         End If

     '********* Add the titles as a child node to the author *****

     Response.Write Chr(10) & "TreeView1.Nodes.Add " & Chr(34) & _
              rstAuthorsTitles(0) & Chr(34) & ", 4,," & Chr(34) & _
              rstAuthorsTitles(2) & Chr(34) & chr(10) & chr(13)
      rstAuthorsTitles.MoveNext
     Loop
   %>

   </SCRIPT>
   </BODY>
   </HTML>

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Keywords: KB183329, kbhowto

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Article Info
Article ID : 183329
Revision : 6
Created on : 3/14/2005
Published on : 3/14/2005
Exists online : False
Views : 450