Introduction to VBScript
What is VBScript
VBScript stands for Visual Basic Scripting Edition. It is an interpreted script language
from Microsoft basically intended to write dynamic interactive web pages . In general,
script languages are easier and faster to code in than the more structured, compiled
languages such as C and C++ and are ideal for smaller programs of limited capability or
that can reuse and tie together with existing compiled programs.
History of VBScript
BASIC - Beginners All-purpose Symbolic Instruction Code- was one of the first high
level programming language . Microsoft corporation has provided a widespread use of BASIC
(many programmers are still using Quick Basic which combines simplicity and high
efficiency). A worldwide "visualization" of computers gave birth to Visual
Basic for Windows Applications. With the advent of Internet and HTML, the
development of active Web applications became available. Till 1996 JavaScript was the only
language for this purpos. In 1996 VBScript has been derived from Visual Basic for active
scripting. The version 3.0 of MS Internet Explorer has supported both JavaScript and
VBScript.
From Basic to VBScript
A syntax of Basic is very similar to those of VBScript. For example, let us
compare (while still without scrutinizing) a simple codes written in both languages for
guessing some random number. In Basic code, a number is inserted from the keyboard, and
the result is displayed on the screen.
10 CLS : RANDOMIZE 20 a = INT ( RND(1)*100+1 ) 30 PRINT "Try to guess a number from 1 to 100" 50 INPUT v 60 IF a > v THEN PRINT "Your number is more" : GOTO 40 70 IF a < v THEN PRINT "Your number is less" : GOTO 40 80 IF a = v THEN PRINT "You did it!" 90 END
In VBScript code a number is input in the HTML element (text-entry field named "textbox" in the program). The result is displayed at the message window while pressing on the other HTML element (button named "but" in the program).
<head><title> </title> <script language="vbscript"><!-- dim a dim v sub begin_onclick randomize a=int(rnd(1)*100+1) alert "Number is guessed" end sub sub but_onclick v = textbox.value v=cint(v) if a > v then alert "Your number is more" p = p + 1 end if if a < v then alert "Your number is less" p = p + 1 end if if a = v then document.write"<center>You did it!</center>" end if end sub --></script> </head> <body> <p><input type="text" name="textbox" size="20"></p> <p><input type="button" name="but" value="click when ready"></p> </body> </html>
The principle distinction between 2 codes is that VBScript inserted
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