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Why this simple example of ajaxToolkit:DynamicPopulateExtender does not work?!!

Posted on 2008-10-18
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Last Modified: 2012-05-05
I just created an example of ajaxToolkit:DynamicPopulateExtender to learn it but it does not work, here is the entire code:

<form>
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true" />
 
<ajaxToolkit:DynamicPopulateExtender ID="dpe1" runat="server"
     ClearContentsDuringUpdate="true"
     TargetControlID="txtContent" ServiceMethod="HelloWorld" ServicePath="OpenTextFile.asmx.vb"     />
     
<asp:Panel ID="pnlEditor" runat="server" >
   <input type="button" onclick="$find('dpe1').populate();" ID="Button1" value="Button" />
</asp:Panel>
        <asp:Label ID="txtContent" runat="server" Text="Label"></asp:Label>
</form>
 
And ere is the service file:
 
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.ComponentModel
Imports System.Web.Script.Services
 
<System.Web.Services.WebService(Namespace:="http://tempuri.org/")> _
<System.Web.Services.WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<ToolboxItem(False)> _
Public Class OpenTextFile
    Inherits System.Web.Services.WebService
 
    <WebMethod()> _
    Public Function HelloWorld() As String
       Return "Hello World"
    End Function
 
End Class

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Question by:Abdu_Allah
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14 Comments
 
LVL 18

Expert Comment

by:carlnorrbom
ID: 22748976
Hi,

The service must be registered as a scriptservice in order to be consumable by script (i.e. Ajax..), please add the following line on top of your service declaration:

<System.Web.Script.Services.ScriptService()> _

/Carl.
0
 
LVL 3

Author Comment

by:Abdu_Allah
ID: 22749298
That does not solve the problem.
0
 
LVL 18

Expert Comment

by:carlnorrbom
ID: 22749421
Hi,

I read through the documentation, it seems the method call requires an arbitrary string parameter (contextKey) which You have not included in your method. Try changing Your method to:
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LVL 18

Expert Comment

by:carlnorrbom
ID: 22749426
Browser hick-up...

Try changing the method to:

    <WebMethod()> _
    Public Function HelloWorld(ByVal contextKey As String) As String
       Return "Hello World"
    End Function
and see if that makes a difference.

/Carl.
0
 
LVL 3

Author Comment

by:Abdu_Allah
ID: 22749497
Sorry the problem still exist.
0
 
LVL 18

Accepted Solution

by:
carlnorrbom earned 500 total points
ID: 22751785
Hi,

Please review the attached snippet, this code works just fine for me. If You still can't get it working, I suggest maybe watching the HDI video by Joe Stagner on the DynamicPopulate extender for some tips on how to implement it.

http://www.asp.net/learn/ajax-videos/video-91.aspx

/Carl.
AutoPopulat.aspx:
 
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="AutoPopulate.aspx.vb" Inherits="AutoPopulate" %>
 
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Dynamic Populate Test Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
        <Services>
            <asp:ServiceReference Path="~/WebService.asmx" />
        </Services>
    </asp:ScriptManager>
    <div>
        <asp:TextBox ID="TextBox1" runat="server" Width="275px"></asp:TextBox><br /><br />
        <input type="button" id="btnPopulate" value="Populate" />
        <cc1:DynamicPopulateExtender ID="dp1" 
                                     runat="server" 
                                     ClearContentsDuringUpdate="true" 
                                     ServicePath="WebService.asmx" 
                                     ServiceMethod="AutoPopulate" 
                                     TargetControlID="TextBox1" 
                                     PopulateTriggerControlID="btnPopulate" >
        </cc1:DynamicPopulateExtender>
    </div>
    </form>
</body>
</html>
 
WebService.vb:
 
Imports System.Web
Imports System.Web.Services
Imports System.Web.Services.Protocols
 
<System.Web.Script.Services.ScriptService()> _
<WebService(Namespace:="http://tempuri.org/")> _
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Public Class WebService
    Inherits System.Web.Services.WebService
 
    <WebMethod()> _
    Public Function AutoPopulate(ByVal contextKey As String) As String
        Return "Message from service at: " & DateTime.Now.ToString
    End Function
 
End Class

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LVL 3

Author Comment

by:Abdu_Allah
ID: 22752272
Your code does not work for me!
By the way I opened FF's Error Console I got the following JS error: $find('dpe1') has no properties. Your code does not give any error but it does not work.
0
 
LVL 18

Expert Comment

by:carlnorrbom
ID: 22752324
Hi,

Hmm, I do not use "$find('dpe1')" anywhere in my provided code, have You left a javascript onclick method anywhere or made any changes to the code I provided?

/Carl.
0
 
LVL 3

Author Comment

by:Abdu_Allah
ID: 22752501
"$find('dpe1')"  is in my code that I use in the question.
0
 
LVL 3

Author Comment

by:Abdu_Allah
ID: 22752503
I tried your code but it does not work.
0
 
LVL 18

Expert Comment

by:carlnorrbom
ID: 22753105
Hi,

My code definately works, tried it out in IE, FF and Safari. If it's not running for You something must be misconfigured in your project / solution and/or dev. environment. You can have a look at http://norrbom.nu/movies/WorkingCode.swf.html to see an swf movie showing my code build and run on IE, FF, Safari without any problems.

/Carl.
0
 
LVL 18

Expert Comment

by:carlnorrbom
ID: 22774063
Hi,

Did you get this working?

/Carl.
0
 
LVL 3

Author Comment

by:Abdu_Allah
ID: 22774863
nop
0
 
LVL 3

Author Comment

by:Abdu_Allah
ID: 22790548
Grade C just because I could'nt get this work.
0

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