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MessageBox not showing message before response.redirect happens

Posted on 2010-08-17
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Last Modified: 2012-06-21
Our web app has multiple pages.  Default.aspx is meant to be the start page.  I'm trying to code something to guard against a user bookmarking another page such as Actions.aspx.  Session["intCaseID"] is set in the Default.aspx page so if it is null then the user must have bookmarked the Actions.aspx page.

The code below will transfer a user to Default.aspx but will not display the message box.  I expected the page to wait until the user had clicked the "OK" button before it executed the response.redirect.  Why did it not wait?

Thx,

Eric
if (Session["intCaseID"] == null)

        {

            Utility.MessageBox("Redirecting you to the start page...");

            Response.Redirect("Default.aspx");

        }

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Question by:Eric3141
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LVL 42

Expert Comment

by:sedgwick
ID: 33454220
what is Utility.MessageBox?is it windows.forms.MessageBox or a custom one?
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Author Comment

by:Eric3141
ID: 33454224
The MessageBox method is contained in a custom class called Utility. The code is below.

public static class Utility
{

public static void MessageBox(string MyMessage)
{
//This method pops a message box onto the screen to display whatever
//text you pass into the method via the input parameter.
string ScriptString = "alert('" + MyMessage + "');";

System.Web.UI.Page page = HttpContext.Current.Handler as System.Web.UI.Page;
page.ClientScript.RegisterStartupScript(typeof(System.Web.UI.Page), "ClientScript", ScriptString, true);

}
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Accepted Solution

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sedgwick earned 500 total points
ID: 33454332
try:

ClientScript.RegisterStartupScript(this.GetType(), "Alert", "alert('"+MyMessage +".');window.open('AnotherPage.aspx','_self');", true);
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LVL 42

Expert Comment

by:sedgwick
ID: 33454390
sorry, u need to integrate the "redirect" in the script:

string ScriptString = "<scriptlanguage='JavaScript'>alert('" + MyMessage + "');window.location.href =
'Default.aspx';</script>";
page.ClientScript.RegisterStartupScript(typeof(System.Web.UI.Page), "ClientScript", ScriptString, true);

check http://bytes.com/topic/asp-net/answers/730759-show-alert-box-then-redirect
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Author Comment

by:Eric3141
ID: 33454426
The first one you gave worked.  The 2nd one gave this error:
 The name 'page' does not exist in the current context  
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LVL 42

Expert Comment

by:sedgwick
ID: 33454588
just remove the 'page':
string ScriptString = "<scriptlanguage='JavaScript'>alert('" + MyMessage + "');window.location.href =
'Default.aspx';</script>";
ClientScript.RegisterStartupScript(typeof(System.Web.UI.Page), "ClientScript", ScriptString, true);
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LVL 2

Author Comment

by:Eric3141
ID: 33454662
Now it says "A runtime error has occurred.  Do you wish to debug?"

If this is getting to be too much trouble for you I can just use the first suggestion you gave which worked though there was a slight hesitation before the redirect happened.
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Expert Comment

by:sedgwick
ID: 33454694
the runtime error occur cause i probably misspelled the script.
if the 1st suggestion works for you, and suit your needs than use it :)
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LVL 2

Author Comment

by:Eric3141
ID: 33454713
I hate to ask now but what would the 2nd script (that gave the error) do that the first would not?  Were there any real advantages to it?
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Expert Comment

by:sedgwick
ID: 33454766
the 2nd suggestion simply use the 'Redirect.Response' in the javascript itself.
they both have the same result, no a meaningful difference either way.
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Author Comment

by:Eric3141
ID: 33455396
Sedqwick:

I was able to take the first code you gave me and create a custom class so I can call this from multple pages.  Thanks for the help!


  public static void WrongSiteEntry()
  {
      //This method handles the case where someone has entered the site via a page other than
      //Default.aspx.  This happens when they bookmark one of the other pages besides Default.aspx.
      //It gives them a message box telling them they being redirected to the start page then
      //redirects them to Default.aspx

      string MyMessage = "Redirecting you to the start page...";
      string ScriptString = "alert('" + MyMessage + ".');window.open('Default.aspx','_self');";

      System.Web.UI.Page page = HttpContext.Current.Handler as System.Web.UI.Page;
      page.ClientScript.RegisterStartupScript(typeof(System.Web.UI.Page), "ClientScript", ScriptString, true);
  }
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LVL 42

Expert Comment

by:sedgwick
ID: 33455422
glad it was helpful. :)
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