B VBScript04

VBScript

VBScript

Session 4

What we learn last session?

What we learn last session?

Constants Constants

VBScript operators. VBScript operators.

Working with Logical, arithmetic and Working with Logical, arithmetic and comparision operators.

Subjects for session 4

Subjects for session 4

Conditional statements.

Conditional statements.

If 

If 

Then

Then

Else

Else

Select Case

Conditional Statements

Conditional Statements

You can control the flow of your script with conditional You can control the flow of your script with conditional statements and looping statements.

statements and looping statements.

Using conditional statements, you can write VBScript code Using conditional statements, you can write VBScript code that makes decisions and repeats actions.

that makes decisions and repeats actions.

The following conditional statements are available in The following conditional statements are available in VBScript:

VBScript:

If 

If _......ThenThen_......ElseElse _{statementstatement}

Select Case

If Then Else

Making Decisions Using

Making Decisions Using

If...Then...Else

If...Then...Else

The

The If...Then...ElseIf...Then...Else _{statement is used tostatement is used to}

evaluate whether a condition is

evaluate whether a condition is TrueTrue _oror

False

False _{and, depending on the result, toand, depending on the result, to}

specify one or more statements to run. specify one or more statements to run. Usually the condition is an expression Usually the condition is an expression that uses a comparison operator to that uses a comparison operator to compare one value or variable with compare one value or variable with another.

another.

If...Then...Else

If...Then...Else _{statements can bestatements can be}

nested to as many levels as you need. nested to as many levels as you need.

Making Decisions Using

Making Decisions Using

If...Then...Else

If...Then...Else

To run only one statement when a condition is

To run only one statement when a condition is TrueTrue_{, use the, use the}

single-line syntax for the

single-line syntax for the If If ...ThenThen...ElseElse _{statement.statement.}

The following example shows the single-line syntax. The following example shows the single-line syntax. Notice that this example omits the

Notice that this example omits the ElseElse _{keyword.keyword.}

Dim

Dim _myDatemyDate

myDate = #2/13/95# myDate = #2/13/95#

If 

If  _{myDate < NowmyDate < Now}ThenThen _{myDate =myDate =}NowNow

To run more than one line of

To run more than one line of code, you must use thecode, you must use the multiple-line (or block) syntax.

multiple-line (or block) syntax. If 

If  _{value = 0value = 0}ThenThen

AlertLabel.

AlertLabel.ForeColor = ForeColor = vbRedvbRed AlertLabel.Font.Bold =

AlertLabel.Font.Bold =TrueTrue

AlertLabel.Font.Italic =

AlertLabel.Font.Italic =TrueTrue

End If 

Making Decisions Using

Making Decisions Using

If...Then...Else

If...Then...Else

Running certain statements if a condition is true and Running Running certain statements if a condition is true and Running others if a condition is false

others if a condition is false

You can use an

You can use an If If ...ThenThen...ElseElse _{statement to define two blocks of statement to define two blocks of} 

executable statements: executable statements:

one block to run if the condition is

one block to run if the condition is TrueTrue_{, the other block to run if the, the other block to run if the}

condition is

condition is FalseFalse_..

If 

If _{value = 0value = 0} ThenThen

AlertLabel.ForeColor = vbRed AlertLabel.ForeColor = vbRed AlertLabel.Font.Bold =

AlertLabel.Font.Bold = TrueTrue

AlertLabel.Font.Italic =

AlertLabel.Font.Italic = TrueTrue

Else

Else

AlertLabel.Forecolor = vbBlack AlertLabel.Forecolor = vbBlack AlertLabel.Font.Bold =

AlertLabel.Font.Bold = FalseFalse

AlertLabel.Font.Italic =

AlertLabel.Font.Italic = FalseFalse

End

Making Decisions Using

Making Decisions Using

If...Then...Else

If...Then...Else

Deciding Between Several Alternatives Deciding Between Several Alternatives

A variation on the

A variation on the If If ...ThenThen...Else...Else _{statement allows you tostatement allows you to}

choose from several alternatives. choose from several alternatives. Adding

Adding ElseIf ElseIf _{clauses expands the functionality of clauses expands the functionality of thethe}

If 

If ...ThenThen...ElseElse _{statement so you can control program flowstatement so you can control program flow}

based on different possibilities. based on different possibilities.

If 

If _{value = 0value = 0}

Then

Then _{Message =Message = ““zerozero””}

ElseIf 

ElseIf _{value = 1value = 1} thenthen

Message =

Message = ““oneone””

ElseIf 

ElseIf _{value = 2value = 2} thenthen

Message =

Message = ““twotwo””

Else

Else

Message = "Value out of range!" Message = "Value out of range!"

End

Making Decisions Using

Making Decisions Using

If...Then...Else

If...Then...Else

You can add as many

You can add as many ElseIf ElseIf _{clauses as you need to provideclauses as you need to provide}

alternative choices. alternative choices. Extensive use of the

Extensive use of the ElseIf ElseIf _{clauses often becomesclauses often becomes}

cumbersome. cumbersome.

A better way to choose between several A better way to choose between several alternatives is the

Select Case

Making Decisions with Select

Making Decisions with Select

Case

Case

Executes one of several groups of statements, depending on Executes one of several groups of statements, depending on the value of an expression.

the value of an expression. The

The SelectSelect CaseCase _{structure provides an alternative tostructure provides an alternative to}

If 

If ...ThenThen...ElseIf ElseIf _{for selectively executing one block of for selectively executing one block of} 

statements from among multiple blocks of statements. statements from among multiple blocks of statements. A

A SelectSelect CaseCase _{statement provides capability similar to thestatement provides capability similar to the}

If 

If ...ThenThen...ElseElse _{statement, but it makes code morestatement, but it makes code more}

efficient and readable. efficient and readable.

Making Decisions with Select

Making Decisions with Select

Case

Case

A SelectSelect CaseCase _{structure works with a single test expressionstructure works with a single test expression}

that is evaluated once, at the top of the structure. that is evaluated once, at the top of the structure.

The result of the expression is then compared with the The result of the expression is then compared with the values for each

values for each CaseCase _{in the structure.in the structure.}

If there is a match, the block of statements associated with If there is a match, the block of statements associated with that

Making Decisions with Select

Making Decisions with Select

Case

Case

Select

Select CaseCase _{strCreditCardstrCreditCard}

Case

Case _{"MasterCard""MasterCard"}

DisplayMCLogo DisplayMCLogo ValidateMCAccount ValidateMCAccount

Case

Case _"Visa""Visa"

DisplayVisaLogo DisplayVisaLogo ValidateVisaAccount ValidateVisaAccount

Case

Case _{"American Express""American Express"}

DisplayAMEXCOLogo DisplayAMEXCOLogo ValidateAMEXCOAccount ValidateAMEXCOAccount

Case

Case ElseElse

DisplayUnknownImage DisplayUnknownImage PromptAgain

PromptAgain

End

Making Decisions with Select

Making Decisions with Select

Case

Case

If testexpressiontestexpression matches anymatches any CaseCase _{expressionlist expressionlist} 

expression, the statements following that

expression, the statements following that CaseCase _{clause areclause are}

executed up to the next

executed up to the next CaseCase _{clause, or for the last clause,clause, or for the last clause,}

up to

up to EndEnd SelectSelect_..

Control then passes to the statement following

Control then passes to the statement following EndEnd SelectSelect_..

If 

If testexpressiontestexpression matches anmatches an expressionlist expressionlist expression inexpression in more than one

more than one CaseCase _{clause, only the statements followingclause, only the statements following}

the first match are executed. the first match are executed.

Making Decisions with Select

Making Decisions with Select

Case

Case

The CaseCase ElseElse _{clause is used to indicate theclause is used to indicate the elsestatementselsestatements}

to be executed if no match is found between the to be executed if no match is found between the testexpression

testexpression and anand an expressionlist expressionlist in any of the otherin any of the other

Case

Case _{selections.selections.}

Although not required, it is a good idea to have a

Although not required, it is a good idea to have a CaseCase ElseElse

statement in your

statement in your SelectSelect CaseCase _{block to handle unforeseenblock to handle unforeseen}

testexpression

testexpression values.values.

Select

Select CaseCase _{statements can be nested. Each nestedstatements can be nested. Each nested} SelectSelect

Case

Case _{statement must have a matchingstatement must have a matching} EndEnd SelectSelect

statement. statement.

Lab 4.1

Lab 4.1

Lab 4.1

Write a small program:

Write a small program:

Declare a constant PASSWORD Declare a constant PASSWORD

Declare two variables strPsw and Name. Declare two variables strPsw and Name.

If the password is OK, Wellcome the user in the reporter If the password is OK, Wellcome the user in the reporter (micPass)

(micPass)

Else , display a message in the Reporter (micFail) Else , display a message in the Reporter (micFail) Use the If 

Lab 4.2

Lab 4.2

Write a small program:

Write a small program:

Declare a variable iNumber Declare a variable iNumber

Display in the reporter the name of the number (

Display in the reporter the name of the number (_““oneone_””,,

““twotwo””))

If the number is not between 0 and 10 display a If the number is not between 0 and 10 display a message

message ““out of rangeout of range””

Use the select Case statement. Use the select Case statement.

Lab 4.3

Lab 4.3

Write a small program:

Write a small program:

Declare a variable iNumber, bSign Declare a variable iNumber, bSign

Like in 4.2, but a number can be from -10 to 10 Like in 4.2, but a number can be from -10 to 10

Display in words, the value of the number i.e. for -2 Display in words, the value of the number i.e. for -2 (Minus two), and for 4 (Plus Four)

(Minus two), and for 4 (Plus Four)

Otherwise display a message out of range Otherwise display a message out of range Use if..then

Use if..then……End If statement once and Select CaseEnd If statement once and Select Case once.

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