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ASP Global.asa

Saturday, August 25, 2012

tags ASP

In ASP, the Global.asa file is an optional file that is generally used to declare application and/or session variables that can be accessed by every page in an ASP application. The Global.asa file is stored in the root directory of the ASP application. You can only have one Global.asa file.


Global.asa Events

In Global.asa you can instruct the web server as to what to do when the ASP application starts and ends, as well as when a user session starts and ends. The start and end events for the application and session are handled by the following four types of events:

  • Application_OnStart
    This event occurs when the first visitor calls the very first page in an ASP application. This event occurs after the Web server is restarted or after the Global.asa file is edited. The "Session_OnStart" event occurs immediately after this event.
  • Session_OnStart
    This event occurs every time a new visitor requests his or her first page in the ASP application.
  • Session_OnEnd
    This event occurs every time a user session ends. The session ends after a timeout period of inactivity. By default, the value is 20 minutes.
  • Application_OnEnd
    This event occurs after the last user session has ended, such as when the web server service has stopped.

Here is an example of how to use the Global.asa file to track the number of online visitors:


<script language="vbscript" runat="server">
Sub Application_OnStart
  Application("users") = 0
  Application("subtotal") = 0
  Application("total") = 0
End Sub

Sub Application_OnEnd()
  Application("total") = Application("subtotal")
End Sub

Sub Session_OnStart
  Application.Lock
  Application("users") = Application("users") + 1
  Application("subtotal") = Application("subtotal") + 1
  Application.UnLock
End Sub

Sub Session_OnEnd
  Application.Lock
  Application("users") = Application("users") - 1
  Application.UnLock
End Sub
</script>

Display the number of online users in your ASP page:

<!DOCTYPE html>
<html>
<head>
  <title>My Page</title>
</head>
<body>
<p>There are <% Response.Write(Application("users")) %> online now!</p>
</body>
</html>


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