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ASP.net example with AJAX
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assassin 2009-09-29, 16:55 #1
Member since Sep 2009 · 1 post
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Subject: ASP.net example with AJAX
I culled the previous conversations in the forum and modified the WebClient sample that comes with the install. Great library by the way. I finally got what I think is a pretty good simple example of a web chat client. It is not ready to ship but it should get other ASP.net / C# developers up and running in no time.

Thanks to all the other discussions that got me going.

Here is the code for the form:

  1. <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebClient._Default" %>
  2.  
  3. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4.  
  5. <html xmlns="http://www.w3.org/1999/xhtml" >
  6. <head runat="server">
  7.     <title>Untitled Page</title>
  8. </head>
  10.     <form id="form1" runat="server">
  11.     <div>
  12.    
  13.         <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="True">
  14.         </asp:ScriptManager>
  15.         <asp:UpdatePanel ID="UpdatePanel1" runat="server">
  16.             <ContentTemplate>
  17.                 <asp:TextBox ID="txtConversation" runat="server" Height="108px"  TextMode="MultiLine" Width="474px"></asp:TextBox>
  18.                 <br />
  19.                 <br />
  20.                 <asp:TextBox ID="txtNewText" runat="server" Height="81px" TextMode="MultiLine"
  21.                    Width="472px"></asp:TextBox>
  22.                 <asp:Timer ID="Timer1" runat="server" Interval="5000" ontick="Timer1_Tick">
  23.                 </asp:Timer>
  24.                 <br />
  25.                 <br />
  26.                 <asp:Button ID="btnSend" runat="server"
  27.                    onclientclick="javascript:SendText();return false;" Text="Send" />
  28.             </ContentTemplate>
  29.         </asp:UpdatePanel>
  30.         <br />
  31.         <br />
  32.         <br />
  33.    
  34.         <asp:Button ID="cmdLogout" runat="server" onclick="cmdLogout_Click"
  35.            Text="Logout" />
  36.    
  37.     </div>
  38.     <script type="text/javascript">
  39.  
  40.         function SendText()
  41.         {
  42.             var str = document.getElementById('txtNewText').value;
  43.  
  44.             document.getElementById('txtConversation').value = document.getElementById('txtConversation').value + "\n" + "me: " + str;
  45.  
  46.             PageMethods.SendMessage(str);
  47.  
  48.             document.getElementById('txtNewText').value = "";
  49.         }
  50.        
  51.     </script>
  52.     </form>
  53. </body>
  54. </html>

      • AND NOW THE CODE BEHIND CODE ***

  1. using System;
  2. using System.Collections;
  3. using System.Configuration;
  4. using System.Data;
  5. using System.Web;
  6. using System.Web.Security;
  7. using System.Web.UI;
  8. using System.Web.UI.HtmlControls;
  9. using System.Web.UI.WebControls;
  10. using System.Web.UI.WebControls.WebParts;
  11.  
  12. using agsXMPP;
  13. using agsXMPP.protocol.client;
  14.  
  15. namespace WebClient
  16. {
  17.     public partial class _Default : System.Web.UI.Page
  18.     {
  19.         private XmppClientConnection xmpp;
  20.         private ArrayList messages;
  21.  
  22.         protected void Page_Load(object sender, EventArgs e)
  23.         {
  24.             if (!IsPostBack && ! IsCallback)
  25.             {
  26.                 xmpp = (XmppClientConnection)Cache["xmpp"];
  27.                 if (xmpp == null)
  28.                 {
  29.                     xmpp = new XmppClientConnection();
  30.                     Cache["xmpp"] = xmpp;
  31.                 }
  32.                 xmpp.OnLogin += new ObjectHandler(xmpp_OnLogin);
  33.  
  34.                 xmpp.AutoPresence = true;
  35.  
  36.                 xmpp.AutoResolveConnectServer = true;
  37.                 xmpp.Port = 5222;
  38.                 xmpp.UseSSL = false;
  39.                 xmpp.Server = "ta-test";
  40.                 xmpp.Username = "chrisp";
  41.                 xmpp.Password = "chris";
  42.  
  43.                 xmpp.Open();
  44.  
  45.                 xmpp.OnMessage += new MessageHandler(xmpp_OnMessage);
  46.  
  47.                 messages = new ArrayList();
  48.                 Cache["messages"] = messages;
  49.             }
  50.         }
  51.  
  52.         void xmpp_OnMessage(object sender, Message msg)
  53.         {
  54.             ArrayList messages = Cache["messages"] as ArrayList;
  55.             messages.Add(msg.Body);
  56.         }
  57.  
  58.         void xmpp_OnLogin(object sender)
  59.         {
  60.             xmpp.Send(new Message(new Jid("matth@ta-test"), MessageType.chat, "Hello, how are you?"));
  61.         }
  62.  
  63.         protected void cmdLogout_Click(object sender, EventArgs e)
  64.         {
  65.             xmpp = (XmppClientConnection)Cache["xmpp"];
  66.             xmpp.Close();
  67.         }
  68.  
  69.         protected void Button1_Click(object sender, EventArgs e)
  70.         {
  71.             txtConversation.Text = txtConversation.Text + "\n" + "me: " + txtNewText.Text;
  72.             xmpp.Send(new Message(new Jid("matth@ta-test"), MessageType.chat, txtNewText.Text));
  73.         }
  74.  
  75.         protected void Timer1_Tick(object sender, EventArgs e)
  76.         {
  77.             ArrayList messages = Cache["messages"] as ArrayList;
  78.             if (messages != null)
  79.             {
  80.                 if (messages.Count > 0)
  81.                 {
  82.                     foreach (string message in messages)
  83.                     {
  84.                         txtConversation.Text = txtConversation.Text + "\n" + "chrisp: " + message;
  85.                     }
  86.                 }
  87.                 messages.Clear();
  88.             }
  89.         }
  90.  
  91.         [System.Web.Services.WebMethod]
  92.         public static void SendMessage(string uniqueID, string text)
  93.         {
  94.             XmppClientConnection xmpp = (XmppClientConnection)HttpRuntime.Cache["xmpp"];
  95.             xmpp.Send(new Message(new Jid("matth@ta-test"), MessageType.chat, text));
  96.         }
  97.     }
  98. }
This post was edited on 2014-04-10, 21:54 by Alex.
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iceball12 2009-11-12, 15:36 #2
Member since Nov 2009 · 3 posts
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do you think that it is possible to update the panels on message event and not using a timer?
Its gonna be pretty difficult to create a workable web client when everyevent from the XmppClientConnection  cannot be directly processed but has to be queed and processed on  timer event.

I want to show a popup right after i get a chat room invite etc.
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Alex 2009-11-12, 16:03 #3
Member since Feb 2003 · 4449 posts · Location: Germany
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yes it is possible. The technology which does this is called Comet.
http://en.wikipedia.org/wiki/Comet_%28programming%29

using comet you can pass events back and forth in realtime without timers,

Is Silverlight an option for you? Then you should take a look at our MatriX library.

Alex
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iceball12 2009-11-16, 10:56 #4
Member since Nov 2009 · 3 posts
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awesome!
I am trying to do i manually but i cant seem to ever find the right controls to update.

So building an chat client using asp.net ajax control without timers should be possible using the xmpp api events !
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iceball12 2009-11-16, 11:15 #5
Member since Nov 2009 · 3 posts
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Do you have any example or more information about how to implement this using asp.net ajax controls?
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Alex 2009-11-16, 12:49 #6
Member since Feb 2003 · 4449 posts · Location: Germany
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there are some good articles with code examples on CodeProject:
http://www.codeproject.com
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