Page 239 - DCAP408_WEB_PROGRAMMING

Unit 9: ASP Objects

The Global.asa file is an optional file that can contain declarations of objects, variables, and Notes
methods that can be accessed by every page in an ASP application. All valid browser scripts
(JavaScript, VBScript, JScript, PerlScript, etc.) can be used within Global.asa.
The Global.asa file can contain only the following:
 Application events

 Session events
 <object> declarations
 TypeLibrary declarations
 the #include directive

Notes The Global.asa file must be stored in the root directory of the ASP application, and
each application can only have one Global.asa file.

Events in Global.asa

In Global.asa you can tell the application and session objects what to do when the application/
session starts and what to do when the application/session ends. The code for this is placed in
event handlers. The Global.asa file can contain four types of events:
Application_OnStart - This event occurs when the FIRST user calls the first page from 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 user requests his or her first page in the
ASP application.
Session_OnEnd - This event occurs EVERY time a user ends a session. A user ends a session after
a page has not been requested by the user for a specified time (by default this is 20 minutes).

Application_OnEnd - This event occurs after the LAST user has ended the session. Typically, this
event occurs when a Web server stops. This procedure is used to clean up settings after the
Application stops, like delete records or write information to text files.
A Global.asa file could look something like this:
<script language=”vbscript” runat=”server”>
sub Application_OnStart
‘’’’some code
end sub
sub Application_OnEnd
‘’’’some code
end sub
sub Session_OnStart
‘’’’some code
end sub
sub Session_OnEnd
‘’’’some code

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