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Visual Basic Script (VBScript)
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Using VBScript in ASP Pages
There are three ways to use VBScript in ASP pages:
1. In-line VBScript statements: The VBScript statements must be enclosed in
the special in-line script tag: <% %>. The enclosed statements will be executed
by the server, and the output of response.write() calls will be merged in-line
with the surrounding static HTML text. In-line VBScript statements require a language declaration
statement to define explicityly VBScript as the server side scripting language,
if you are not sure what is the default language defined on the Web server.
<%@ language="vbscript"%>
...
<%
vbscript_statement
vbscript_statement
...
%>
2. In-line VBScript expression: The VBScript expression must be enclosed in
the special in-line script tag: <% %> with a leading "=" sign. The enclosed
expression will be evaluated, and the resulting value will be converted into a
string and merged in-line withh the surrounding static HTML text. In-line VBScript
expression also require a language declaration
statement to define explicityly VBScript as the server side scripting language,
if you are not sure what is the default language defined on the Web server.
<%@ language="vbscript"%>
...
<%
= vbscript_expresion
%>
3. Script block of VBScript statements: The VBScript statements must be
enclosed by the starting script block tag <script> and the ending tag </script>.
Two attributes are required on the script tag: "language" and "runat".
<script language="vbscript" runat="server">
vbscript_statement
vbscript_statement
...
</script>
Please note that the script block VBScript statements will be executed by the server.
But the output of response.write() calls will not be merged in-line with the
surrounding static HTML text. It will be:
- Inserted at the beginning of the HTTP reponse before any static HTML text,
if the server's default scripting language is not VBScript.
- Appended at the end of the HTTP reponse after any static HTML text,
if the server's default scripting language is VBScript.
This rule was a big supprise to me.
I had to post a message to microsoft.public.inetsdk.programming.scripting.vbscript,
and got confirmed from Microsoft. See the article
Using VBScript and JScript on a Web Page.
Mixing VBScript Statements with Static HTML Text
Here is an ASP page example to show you how in-line statements and expressions
can be mixed with static HTML text:
<%@ language="vbscript"%>
<!-- inline_syntax.asp
Copyright (c) 2003 by Dr. Herong Yang
This program shows how to use inline scripting statements and
expressions.
-->
<html><body>
Good
<% if 0 <= hour(time) and hour(time) < 12 then %>
moring,
<% elseif 12 <= hour(time) and hour(time) < 18 then %>
afternoon,
<% else
response.write("evening,")
end if %>
Herong.</br>
<% response.write("The current server time is: ") %>
<% = Time %> on <% = Date %>
</body></html>
Output:
Good evening, Herong.
The current server time is: 10:01:56 PM on 5/24/2003
In the previous example, I was able to break the "if" statement into two parts
and use in-line script for one part and static text for the other.
(Continued on next part...)
Part:
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