Question

Display Message box from ASP.NET Webform

Asked by: Mike_Stevens

I am looking to find some code that will allow me to display a message box when called from an asp.net webform.  I would like to be able have the code in a class module where i have all of my other generic functions.  Then from whereever i what to display the message I just call the function and pass the text that i want to appear as part of the message.

I have found one example that does what i want but when i call it the current web page is blank while the message box is displayed.

I also found the following code in an article here in the experts exchange but i cant seem to get it to work when i call it from a class module.  It would if the function is part of the webform but when i try and call it from a class module it get the following error:

"Object reference not set to an instance of an object"

Here is the code that i am using:

Public Sub Display_Message(ByVal strMsg As String)
 
  Dim strScript As String
  strScript = "<script language=JavaScript>"
  strScript &= "alert(strMsg);"
  strScript &= "</script>"
  If (Not Page.IsStartupScriptRegistered("clientScript")) Then
      Page.RegisterStartupScript("clientScript", strScript)
  End If

Again, this works if the function is part of the page but i want to be able to call it from a class module.

Does any body have any good examples of displaying a message box or any ideas why the above code does not work?

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Asked On
2005-06-23 at 06:38:30ID21468270
Tags

message

,

box

,

display

Topic

Miscellaneous Programming

Participating Experts
1
Points
125
Comments
2

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Answers

 

by: pillbug22Posted on 2005-06-23 at 08:15:07ID: 14284936

Here's what I use (I have this in a class called Utilities where I keep different helper functions). The only problem is checking to see if the script is already registered...I can see where it might be a problem registering/running the same messagebox twice, but when I have the If statement enabled, it doesn't run at all...






    Public Shared Sub CreateMessageAlert(ByRef aspxPage As System.Web.UI.Page, _
                             ByVal strMessage As String, ByVal strKey As String)
        Dim strScript As String = "<script language=JavaScript>alert('" _
                                            & strMessage & "')</script>"

        'If (Not aspxPage.IsStartupScriptRegistered(strKey)) Then
        aspxPage.RegisterStartupScript(strKey, strScript)
        'End If
    End Sub

 

by: Mike_StevensPosted on 2005-06-23 at 08:36:49ID: 14285249

Well it seems to do what i want.  Thanks for your help.

20120131-EE-VQP-002

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