asked on

Change the src of an IFrame dynamically

I'm trying to change the src of an IFrame dynamically every 30 seconds using C# code behind and a timer. Here's my web page:

<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="true" Inherits="WebApplication1.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
      <HEAD>
            <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
            <meta name="CODE_LANGUAGE" Content="C#">
            <meta name="vs_defaultClientScript" content="JavaScript">
            <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
      </HEAD>
      <body MS_POSITIONING="GridLayout" bgcolor="#ffffff">
      <form id="Form1" runat="server">
                  <iframe runat=server id='myFrame' align='right' src='about:blank' height='100%' width='75%'></iframe>
      </form>
      </body>
</HTML>

Here's my code behind without the "using" includes:

namespace WebApplication1
{
      public class WebForm1 : System.Web.UI.Page
      {
            protected System.Web.UI.HtmlControls.HtmlGenericControl myFrame;
            private System.Timers.Timer timer1;
            private int state;
            private double startTime;

            private void Page_Load(object sender, System.EventArgs e)
            {
                  theState = 1;
                  startTime = getTime();
            }

            override protected void OnInit(EventArgs e)
            {
                  //
                  // CODEGEN: This call is required by the ASP.NET Web Form Designer.
                  //
                  InitializeComponent();
                  base.OnInit(e);

            }

            private void InitializeComponent()
            {
                  this.Load += new System.EventHandler(this.Page_Load);
                  this.components = new System.ComponentModel.Container();
                  this.timer1 = new System.Timers.Timer();
                  //
                  // timer1
                  //
                  this.timer1.Enabled = true;
                  this.timer1.Interval = 1000;
                  this.timer1.Elapsed += new ElapsedEventHandler(this.myTest);
            }

            private void myTest(object sender, ElapsedEventArgs e)
            {
                  double now = getTime();
                  if(theState == 1 && (now > startTime + 30))
                  {
                        theState = 2;
                        startTime = getTime();
                        myFrame.Attributes["src"] = "http://dc.indymedia.org/";
                  }
                  else if(theState == 2 && (now > startTime + 30))
                  {
                        theState = 3;
                        startTime = getTime();
                        myFrame.Attributes["src"] = "http://www.zmag.org/ZNETTOPnoanimation.html";
                  }
                  else if(theState == 3 && (now > startTime +30))
                  {
                        theState = 4;
                        startTime = getTime();
                        myFrame.Attributes["src"] = "http://www.alternet.org";
                  }
                  else if(theState == 4 && (now > startTime + 30))
                  {
                        theState = 5;
                        startTime = getTime();
                        myFrame.Attributes["src"] = "http://www.thenation.com/";
                  }
                  else if(theState == 5 && (now > startTime + 30))
                  {
                        theState = 6;
                  }
            }

            private double getTime()
            {
                  DateTime d1 = DateTime.Now;
                  return((double)d1.Hour * 3600 + (double)d1.Minute * 60 + (double)d1.Second + (double)d1.Millisecond/1000);
            }


      }
}

Iframe never changes from the initial setting. Am I missing something?

ASKER CERTIFIED SOLUTION

rdivilbiss

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wsmith5204

ASKER

So there is no way to get the IFrame to load the URL from C#?

SOLUTION

HugoHiasl

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