How to create a pop-up message box to display error message in .net c# web-applications

Question

Does anyone know how can I create a pop-up message box in server side, so that it will display the error message in the pop-up message box when save process is failed?

Example:

   protected void btnSave_Click(object sender, EventArgs e)
   {
       try
       {
           using (TransactionScope scope = new TransactionScope())
           {
               //save process

               scope.Complete();
               Response.Redirect(url);
           }
       }
       catch (TransactionAbortedException ex)
       {
          //pop-up message box to show error message
       }
       catch (ApplicationException ex)
       {
          //pop-up message box to show error message
       }
   }

How can I able to create a pop-up message box within the catch to pop-up the error message box to the user when the save process is failed?

@Kiranu - please tell me that was a trick question - you cannot get a message box to pop up on the server! — slugster
– slugster, Commented May 23, 2011 at 2:09
@slugster - I know... but it wasn't clear if what he wanted was something that was possible (a popup in the client) or impossible (a form created by a windows service) — Carlos G.
– Carlos G., Commented May 23, 2011 at 3:19

Alex Aza · Accepted Answer · 2011-05-23 02:04:31Z

2

ClientScript.RegisterStartupScript(
    this.GetType(), "myalert", "alert('" + errorText + "');", true);

or

 Response.Write(
     @"<SCRIPT LANGUAGE=""JavaScript"">alert('" + errorText + "')</SCRIPT>");

edited May 23, 2011 at 2:04

answered May 23, 2011 at 1:57

Alex Aza

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5 Comments

Jin Yong Over a year ago

@Alex Aza; I applied the code you have giving before the try{}catch() .. it's doesn't seem any message box been pop-up

Alex Aza Over a year ago

@Jin Yong - weird, I tested this on .NET 2, 3.5 and 4 - worked for me.

KaeL Over a year ago

Maybe javascript is turned off from the browser. Try turning it on.

Alex Aza Over a year ago

@Jin - I just realized, you cannot test it like this, you can't apply it before try catch because you redirect to run Response.Redirect(url); in a normal scenario, which redirects to another page. To test properly, add one my line and do return just after that line.

Alex Aza Over a year ago

@Jin Yong - out of curiosity, what was the solution that worked for you? Did you use 'Page.RegisterStartupScript'?

Drew · Accepted Answer · 2011-05-23 02:09:09Z

1

Try using either the Page.RegisterStartupScript or ClientScript.RegisterStartupScript methods.

answered May 23, 2011 at 2:09

Drew

733 bronze badges

2 Comments

Alex Aza Over a year ago

Page.RegisterStartupScript is deprecated.

JTew Over a year ago

Hi Drew, a good way to get accepted answers is to elaborate on the concepts in the question and then provide a specific working example. Alternatives are always good as well. A complete answer is likely to generate more Stack Overflow points for you over time. Hope this helps.

Steve Wellens · Accepted Answer · 2011-05-23 02:13:05Z

0

Here's one way:

/// ---- ShowAlert --------------------------------
///     
/// <summary>
/// popup a message box at the client    
/// </summary>
/// <param name="page">A Page Object</param>
/// <param name="message">The Message to show</param>

public static void ShowAlert(Page page, String message)
{
    String Output;
    Output = String.Format("alert('{0}');",message);
    page.ClientScript.RegisterStartupScript(page.GetType(), "Key", Output, true);
}

answered May 23, 2011 at 2:13

Steve Wellens

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3 Comments

Alex Aza Over a year ago

How this is different from my answer? :)

Steve Wellens Over a year ago

@Alex - When I posted my answer, yours was not yet visible.

Alex Aza Over a year ago

that's weird. Our answers are 15 minutes apart. So now when you see this, you can remove the duplicate answer, or change it to be different, right?

Michael Kennedy · Accepted Answer · 2011-05-27 17:22:50Z

0

While the alert() scripts mentioned are OK, they come across pretty amateurish. I would recommend two options.

Have a label on your page which is normally hidden with font color red, and bold. Then just make it visible and set the text on error.
If you want a dialog behavior, use what everyone is showing you, but instead of popping up an alert, pick something nice from jQuery UI with a nice error icon and even a help link or something in the dialog. Here's an example: http://jqueryui.com/demos/dialog/#modal-message

Of course, if you want your app to seem more reliable, don't show them any error. :)

answered May 27, 2011 at 17:22

Michael Kennedy

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