VBScript - Syntax

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Your First VBScript

Let us write a VBScript to print out "Hello World".

<html>
   <body>
      <script language = "vbscript" type = "text/vbscript">
         document.write("Hello World!")
      </script>
   </body>
</html>

In the above example, we called a function document.write, which writes a string into the HTML document. This function can be used to write text, HTML or both. So, above code will display following result −

Hello World!

Whitespace and Line Breaks

VBScript ignores spaces, tabs, and newlines that appear within VBScript programs. One can use spaces, tabs, and newlines freely within the program, so you are free to format and indent your programs in a neat and consistent way that makes the code easy to read and understand.

Formatting

VBScript is based on Microsoft's Visual Basic. Unlike JavaScript, no statement terminators such as semicolon is used to terminate a particular statement.

Single Line Syntax

Colons are used when two or more lines of VBScript ought to be written in a single line. Hence, in VBScript, Colons act as a line separator.

<script language = "vbscript" type = "text/vbscript">
   var1 = 10 : var2 = 20
</script>

Multiple Line Syntax

When a statement in VBScript is lengthy and if user wishes to break it into multiple lines, then the user has to use underscore "_". This improves the readability of the code. The following example illustrates how to work with multiple lines.

<script language = "vbscript" type = "text/vbscript">
   var1 = 10 
   var2 = 20
   Sum = var1 + var2  
   document.write("The Sum of two numbers"&_"var1 and var2 is " & Sum)
</script>

Reserved Words

The following list shows the reserved words in VBScript. These reserved words SHOULD NOT be used as a constant or variable or any other identifier names.

Loop LSet Me
Mod New Next
Not Nothing Null
On Option Optional
Or ParamArray Preserve
Private Public RaiseEvent
ReDim Rem Resume
RSet Select Set
Shared Single Static
Stop Sub Then
To True Type
And As Boolean
ByRef Byte ByVal
Call Case Class
Const Currency Debug
Dim Do Double
Each Else ElseIf
Empty End EndIf
Enum Eqv Event
Exit False For
Function Get GoTo
If Imp Implements
In Integer Is
Let Like Long
TypeOf Until Variant
Wend While With
Xor Eval Execute
Msgbox Erase ExecuteGlobal
Option Explicit Randomize SendKeys

Case Sensitivity

VBScript is a case-insensitive language. This means that language keywords, variables, function names and any other identifiers need NOT be typed with a consistent capitalization of letters. So identifiers int_counter, INT_Counter and INT_COUNTER have the same meaning within VBScript.

Comments in VBScript

Comments are used to document the program logic and the user information with which other programmers can seamlessly work on the same code in future. It can include information such as developed by, modified by and it can also include incorporated logic. Comments are ignored by the interpreter while execution. Comments in VBScript are denoted by two methods.

1. Any statement that starts with a Single Quote (‘) is treated as comment.

Following is the example −

<script language = "vbscript" type = "text/vbscript">
   <!—
      ' This Script is invoked after successful login
      ' Written by : Howcodex
      ' Return Value : True / False
   //- >
</script>

2. Any statement that starts with the keyword “REM”.

Following is the example −

<script language = "vbscript" type = "text/vbscript">
   <!—
      REM This Script is written to Validate the Entered Input
      REM Modified by  : Tutorials point/user2
   //- >
</script>
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