testing

1. Scripting Languages -Scripting Languages -
VBScriptVBScript

2. Compiled LanguagesCompiled Languages
 Source File (Text)Source File (Text)
 Pre-process – Replace/update directivesPre-process – Replace/update directives
 Compile – Create assembly language fileCompile – Create assembly language file
 Compilers and machine specificCompilers and machine specific
 Once compiled, cannot be decompiled (easily) – Not 1-to-1Once compiled, cannot be decompiled (easily) – Not 1-to-1
 Assemble – Create binary executableAssemble – Create binary executable
 AdvantagesAdvantages
 Fast!Fast!
 (Relatively) Safe from alteration/theft(Relatively) Safe from alteration/theft
 Use traditional languages (smaller learning curve, lots ofUse traditional languages (smaller learning curve, lots of
talent available)talent available)
 DisadvantagesDisadvantages
 Not portableNot portable
 Need to re-compile to changeNeed to re-compile to change
 Not efficient for simple tasksNot efficient for simple tasks

3. Scripting Languages BackgroundScripting Languages Background
 Unix Shell scripts – sh, csh, bash, tcsh, zsh,Unix Shell scripts – sh, csh, bash, tcsh, zsh,
kshksh
 Allowed easier performance of basic system tasksAllowed easier performance of basic system tasks
 Text commands could be “processed”Text commands could be “processed”
 Same concept as batch filesSame concept as batch files
 Standalone scripting languagesStandalone scripting languages
 Awk, sed, grep, etc…Awk, sed, grep, etc…
 Allowed limited power to do repetitive tasks easyAllowed limited power to do repetitive tasks easy
 Made for specific-purposeMade for specific-purpose

4. Scripting Languages - GeneralScripting Languages - General
 TCL/TKTCL/TK
 PythonPython
 PERLPERL
 Used for more advanced programming tasksUsed for more advanced programming tasks
 Became almost as powerful as any compiled languageBecame almost as powerful as any compiled language
 AdvantagesAdvantages
 Text files – can be ported anywhere!Text files – can be ported anywhere!
 Easy to changeEasy to change
 Easy to write/debugEasy to write/debug
 DisadvantagesDisadvantages
 Slow – must be interpreted by a script interpreter (not standalone)Slow – must be interpreted by a script interpreter (not standalone)
 Not quite as powerful as compiled languages (e.g. for addressing ofNot quite as powerful as compiled languages (e.g. for addressing of
hardware)hardware)

5. Scripting Languages – Web BasedScripting Languages – Web Based
 Originally PERL was most popular through CGIOriginally PERL was most popular through CGI
 PERL had issuesPERL had issues
 SlowSlow
 Required a new instance of the PERL interpreter toRequired a new instance of the PERL interpreter to
spawn with each requestspawn with each request
 Somewhat convoluted to learn – based on C/C+Somewhat convoluted to learn – based on C/C+
+/Unix scripting+/Unix scripting
 Interpreter support was scatteredInterpreter support was scattered
 Not built specifically for the webNot built specifically for the web
 Only Server SideOnly Server Side
 PERLEXAMPLE1PERLEXAMPLE1

6. Web Scripting – JavaScript HistoryWeb Scripting – JavaScript History
 ~1994 Netscape begins building LiveScript!~1994 Netscape begins building LiveScript!
 Netscape forms alliance with Sun, gains naming rights toNetscape forms alliance with Sun, gains naming rights to
Java nameJava name
 Renames LiveScript Javascript, and releases withRenames LiveScript Javascript, and releases with
browser 2.0browser 2.0
 Microsoft responds with VBScriptMicrosoft responds with VBScript
 Microsoft response with JscriptMicrosoft response with Jscript
 Netscape fires back with 1.1, 1.2 versionsNetscape fires back with 1.1, 1.2 versions
 ECMA – European Computer Manufacturers AssociationECMA – European Computer Manufacturers Association
– creates non-partisan standard– creates non-partisan standard
 Javascript designed for client-side scriptingJavascript designed for client-side scripting
 Netscape had >50% of the marketNetscape had >50% of the market
 JSEXAMPLE1JSEXAMPLE1

7. Web Scripting – VBScript HistoryWeb Scripting – VBScript History
 Visual BasicVisual Basic
 Created as a simple alternative to C/C++ developmentCreated as a simple alternative to C/C++ development
 Supported RAD within WindowsSupported RAD within Windows
 Based on BASIC programming languageBased on BASIC programming language
 Contained and IDE, support for GUI tools for displayContained and IDE, support for GUI tools for display
 Became overnight successBecame overnight success
 Visual Basic for ApplicationsVisual Basic for Applications
 Subset of Visual BasicSubset of Visual Basic
 Created to extend other programs (e.g. Office)Created to extend other programs (e.g. Office)
 Used standard VB commandsUsed standard VB commands
 Adopted by other companies to customize their applicationsAdopted by other companies to customize their applications
(Siebel, Clarify)(Siebel, Clarify)

8. Web Scripting – VBScript History,Web Scripting – VBScript History,
cont’dcont’d
 Visual Basic Scripting EditionVisual Basic Scripting Edition
 Created as a “safer” version of VBACreated as a “safer” version of VBA
 Strict subset of VBAStrict subset of VBA
 Made in response to JavascriptMade in response to Javascript
 Supported in Internet Explorer 3.x+Supported in Internet Explorer 3.x+
 Easier to learn, based on familiar VB/BASICEasier to learn, based on familiar VB/BASIC
commandscommands
 Originally client sideOriginally client side
 No file reads/writes/OS manipulation like VBANo file reads/writes/OS manipulation like VBA
 Expanded to Server sideExpanded to Server side
 Expanded to OutlookExpanded to Outlook
 Problem .vbs extensions!Problem .vbs extensions!

9. Web Scripting – VBScript History,Web Scripting – VBScript History,
cont’dcont’d
 Expanded to support ASP pages (serverExpanded to support ASP pages (server
side!)side!)
 Allowed dynamic SQL queriesAllowed dynamic SQL queries
 Allowed better SSIAllowed better SSI
 Could actually do real-time calculationsCould actually do real-time calculations
 Removed the limitations of PERLRemoved the limitations of PERL
 Still a bit slow, interpreted, and not quite asStill a bit slow, interpreted, and not quite as
robust as VBrobust as VB

10. VBScript BasicsVBScript Basics
 <script> tag<script> tag
 delineates scripting language code will followdelineates scripting language code will follow
 AttributesAttributes
 type=“text/vbscript”type=“text/vbscript”
 language=”vbscript” or “vbs”language=”vbscript” or “vbs”
 runat = “server” (default is browser)runat = “server” (default is browser)
 VBScript is Case insensitiveVBScript is Case insensitive
 Whitespace is ignoredWhitespace is ignored
 Comments should use ‘ or RemComments should use ‘ or Rem
 Code is denoted by lines. To span multiple lines, use _Code is denoted by lines. To span multiple lines, use _
 Code outside of a subroutine or function automaticallyCode outside of a subroutine or function automatically
runs on page loadruns on page load
 VBEXAMPLE1VBEXAMPLE1

11. VBScript Basics – Data TypesVBScript Basics – Data Types
 Only one main type – VariantOnly one main type – Variant
 Similar to variable in other languagesSimilar to variable in other languages
 No specific datatype (e.g. integer, real,No specific datatype (e.g. integer, real,
character, string, etc…)character, string, etc…)
 Global or local scopeGlobal or local scope
 Declared using the Dim statementDeclared using the Dim statement
 Dim var1, var2, var3Dim var1, var2, var3
 var = 0var = 0
 var = “Hello World”var = “Hello World”

12. VBScript Basics – Data SubtypesVBScript Basics – Data Subtypes
 Controlled by VBScript engineControlled by VBScript engine
 0 -Empty – Declared, but no value is assigned0 -Empty – Declared, but no value is assigned
 1 -Null – Contains no valid data1 -Null – Contains no valid data
 Var = NULLVar = NULL
 11 - Boolean11 - Boolean
 Var1 = TrueVar1 = True
 17 - Byte – 0 – 25517 - Byte – 0 – 255
 2 - Integer - -32,768 – 327672 - Integer - -32,768 – 32767
 3 - Long - -2,000,000,000 – 2,000,000,0003 - Long - -2,000,000,000 – 2,000,000,000
 4,5 - Single, Double – Real numbers (decimals!)4,5 - Single, Double – Real numbers (decimals!)
 7 - Date/Time – 01/01/100 – 12/31/99997 - Date/Time – 01/01/100 – 12/31/9999
 6 - Currency6 - Currency
 8 - String8 - String
 9 - Object – HTML or ActiveX9 - Object – HTML or ActiveX
 10 - Error10 - Error

13. VBScript Basics – VariableVBScript Basics – Variable
OperationsOperations
 Determining the variable subtypeDetermining the variable subtype
 VarType (var1)VarType (var1)
 Returns numeric representation of the datatypeReturns numeric representation of the datatype
 TypeName (var1)TypeName (var1)
 Returns actual name of type!Returns actual name of type!
 VBScript can perform operations on two variants without needingVBScript can perform operations on two variants without needing
you to make the types agreeyou to make the types agree
 Var1 = 7Var1 = 7
 Var2 = 123.23Var2 = 123.23
 Var3 = Var1 + Var2Var3 = Var1 + Var2
 ConstantsConstants
 Const PI 3.14Const PI 3.14
 Usually capitalizedUsually capitalized
 Cannot be changedCannot be changed
 VBEXAMPLE2VBEXAMPLE2

14. VBScript Basics – Math OperatorsVBScript Basics – Math Operators
 + addition+ addition
 var1 = var2 + var3var1 = var2 + var3
 –– subtractionsubtraction
 var1 = var2 – var3var1 = var2 – var3
 / division/ division
 var1 = var2 / var3var1 = var2 / var3
 * multiplication* multiplication
 var1 = var2 * var3var1 = var2 * var3
 Integer division Integer division
 var1 = var2 var3var1 = var2 var3
 Returns only the integer portionReturns only the integer portion
 Mod – moduloMod – modulo
 Var1 = var2 Mod var3Var1 = var2 Mod var3
 Returns the remainder after divisionReturns the remainder after division
 ^ - Exponentiation^ - Exponentiation
 var1 = var2 ^ var3var1 = var2 ^ var3

15. VBScript Basics – LogicalVBScript Basics – Logical
OperatorsOperators
 Concatenation - &Concatenation - &
 ““Adds” strings togetherAdds” strings together
 ComparisonComparison
 >, <, <>, >=, <=, =>, <, <>, >=, <=, =
 Returns a “True” or a “False”Returns a “True” or a “False”
 E.g. var1 > 6E.g. var1 > 6
 LogicalLogical
 AND, Or, NotAND, Or, Not
 VBEXAMPLE3VBEXAMPLE3

16. VBScript Basics – ControlVBScript Basics – Control
Statements – If-Then-ElseStatements – If-Then-Else
 Determine program flowDetermine program flow
 Conditional statementsConditional statements
 If – ThenIf – Then
 If var1 > 2 ThenIf var1 > 2 Then
 Document.Write “var1 >2”Document.Write “var1 >2”
 End IfEnd If
 If – Then – ElseIf – Then – Else
 If var1 > 2 ThenIf var1 > 2 Then
 Document.Write “var1 >2”Document.Write “var1 >2”
 ElseElse
 Document.Write “var1 <=2”Document.Write “var1 <=2”
 End IfEnd If

17. VBScript Basics – ControlVBScript Basics – Control
Statements – If-Then-ElseIfStatements – If-Then-ElseIf
 If – Then – ElseIfIf – Then – ElseIf
 Same as nested If’sSame as nested If’s
 If var1 > 2 ThenIf var1 > 2 Then
 Document.Write “var1 >2”Document.Write “var1 >2”
 ElseIf var1 = 2 ThenElseIf var1 = 2 Then
 Document.Write “var1 = 2”Document.Write “var1 = 2”
 ElseElse
 Document.Write “var1 < 2”Document.Write “var1 < 2”
 End IfEnd If
 VBEXAMPLE4VBEXAMPLE4

18. VBScript Basics – ControlVBScript Basics – Control
Statements – Select-CaseStatements – Select-Case
 Concise way of writing multiple if-then statementsConcise way of writing multiple if-then statements
 Select Case nameSelect Case name
 Case “Bob”Case “Bob”
 Document.Write “Bob”Document.Write “Bob”
 Case “Mary”Case “Mary”
 Document.Write “Mary”Document.Write “Mary”
 Case “Bill”Case “Bill”
 Document.Write “Bill”Document.Write “Bill”
 Case ElseCase Else
 Document.Write “Other case!”Document.Write “Other case!”
 End SelectEnd Select
 VBEXAMPLE5VBEXAMPLE5

19. VBScript Basics – LoopingVBScript Basics – Looping
 Repeats a command or set of commandsRepeats a command or set of commands
 For – NextFor – Next
 For x = 1 to 20For x = 1 to 20
 Document.Write “<br />” & xDocument.Write “<br />” & x
 NextNext
 VBEXAMPLE6VBEXAMPLE6