VBScript
  1. VBScript intro
  2. VBScript basics
  3. VBScript variables
  4. VBScript procedures
  5. VBScript popup boxes
  6. VBScript conditions
  7. VBScript loops
  8. VBScript arrays
  9. VBScript strings
  10. VBScript date & time
  11. VBScript for IE 11
  12. VBScript summary

VBScript variables

Variables are a fundamental concept in many computer languages and knowing how to work with them is essential knowledge.

This tutorial focuses on:

What is a variable?

A variable is a container which stores information in a computer's memory. The value of a variable can change all throughout a script.

Declaring variables

In VBScript a variable is declared with the Dim statement.

Syntax:
Dim variableName
Example:
<script type="text/vbscript"> Dim title </script>

Once you declare a variable, you can give it a value.

Example:
<script type="text/vbscript"> Dim title title = "A book to read" </script>

NOTE: The Dim statement should be used only once with each variable - during declaration. After a variable has been declared, you can refer to it by its name without the Dim statement.

Option explicit

It is possible that within a script you will misspell a variable name and consequently get unexpected results. For example, if you misspell the variable name "title" as "titld", VBScript will automatically generate a variable with the name "titld". You can prevent this from happening by using the option explicit statement. This statement goes all the way at the top of a script.

Example:
<script type="text/vbscript"> option explicit Dim title title = "A book to read" </script>

Naming variables

When naming variables, several rules should be followed:

Printing variables

Variables are printed by including the variable name in a document.write() command. When printing the value of a variable, the variable name should NOT be included in double quotes.

Example:
<html> <head> <title>Printing variables</title> </head> <body> <script type="text/vbscript"> Dim numChairs numChairs = 5 document.write(numChairs) </script> </body> </html>
Output:
5

You can also print variables together with regular text. To do this, use the & symbol to join the text and variable values together.

Example:
<html> <head> <title>Printing variables and text together</title> </head> <body> <script type="text/vbscript"> Dim teamName, teamState, numWins, numLosses teamName = "The Penguins" teamState = "Connecticut" numWins = 12 numLosses = 2 document.write("The name of the team is " & teamName) document.write("<br />The team is from " & teamState) document.write("<br />" & teamName & " have won " & numWins & " games and have lost " & numLosses & " games") </script> </body> </html>
Output:
The name of the team is The Penguins The team is from Connecticut The Penguins have won 12 games and have lost 2 games
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