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VBScript

VBScript. Session 4. What we learn last session?. Constants VBScript operators. Working with Logical, arithmetic and comparision operators. Subjects for session 4. Conditional statements. If … Then … Else Select Case. Conditional Statements.

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VBScript

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  1. VBScript Session 4

  2. What we learn last session? • Constants • VBScript operators. • Working with Logical, arithmetic and comparision operators.

  3. Subjects for session 4 • Conditional statements. • If…Then…Else • Select Case

  4. Conditional Statements • You can control the flow of your script with conditional statements and looping statements. • Using conditional statements, you can write VBScript code that makes decisions and repeats actions. • The following conditional statements are available in VBScript: • If...Then...Else statement • Select Case statement

  5. If Then Else

  6. Making Decisions Using If...Then...Else • The If...Then...Else statement is used to evaluate whether a condition is True or False and, depending on the result, to specify one or more statements to run. • Usually the condition is an expression that uses a comparison operator to compare one value or variable with another. • If...Then...Else statements can be nested to as many levels as you need.

  7. Making Decisions Using If...Then...Else • To run only one statement when a condition is True, use the single-line syntax for the If...Then...Else statement. • The following example shows the single-line syntax. Notice that this example omits the Else keyword. Dim myDate myDate = #2/13/95# If myDate < Now Then myDate = Now To run more than one line of code, you must use the multiple-line (or block) syntax. If value = 0 Then AlertLabel.ForeColor = vbRed AlertLabel.Font.Bold = True AlertLabel.Font.Italic = TrueEnd If

  8. Making Decisions Using If...Then...Else • Running certain statements if a condition is true and Running others if a condition is false • You can use an If...Then...Else statement to define two blocks of executable statements: • one block to run if the condition is True, the other block to run if the condition is False. If value = 0 Then AlertLabel.ForeColor = vbRed AlertLabel.Font.Bold = True AlertLabel.Font.Italic = True Else AlertLabel.Forecolor = vbBlack AlertLabel.Font.Bold = False AlertLabel.Font.Italic = False EndIf

  9. Making Decisions Using If...Then...Else • Deciding Between Several Alternatives • A variation on the If...Then...Else statement allows you to choose from several alternatives. • Adding ElseIf clauses expands the functionality of the If...Then...Else statement so you can control program flow based on different possibilities. • If value = 0 • Then Message = “zero” • ElseIf value = 1 then • Message = “one” • ElseIf value = 2 then • Message = “two” • Else • Message = "Value out of range!" • EndIf

  10. Making Decisions Using If...Then...Else • You can add as many ElseIf clauses as you need to provide alternative choices. • Extensive use of the ElseIf clauses often becomes cumbersome. • A better way to choose between severalalternatives is the Select Case statement.

  11. Select Case

  12. Making Decisions with Select Case • Executes one of several groups of statements, depending on the value of an expression. • The SelectCase structure provides an alternative to If...Then...ElseIf for selectively executing one block of statements from among multiple blocks of statements. • A SelectCase statement provides capability similar to the If...Then...Elsestatement, but it makes code more efficient and readable.

  13. Making Decisions with Select Case • A SelectCase structure works with a single test expression that is evaluated once, at the top of the structure. • The result of the expression is then compared with the values for each Case in the structure. • If there is a match, the block of statements associated with that Case is executed

  14. Making Decisions with Select Case • SelectCase strCreditCard Case "MasterCard" DisplayMCLogo ValidateMCAccount Case "Visa" DisplayVisaLogo ValidateVisaAccount Case "American Express" DisplayAMEXCOLogo ValidateAMEXCOAccount CaseElse DisplayUnknownImage PromptAgain EndSelect

  15. Making Decisions with Select Case • If testexpression matches any Caseexpressionlist expression, the statements following that Case clause are executed up to the next Case clause, or for the last clause, up to EndSelect. • Control then passes to the statement following EndSelect. • If testexpression matches an expressionlist expression in more than one Case clause, only the statements following the first match are executed.

  16. Making Decisions with Select Case • The CaseElse clause is used to indicate the elsestatements to be executed if no match is found between the testexpression and an expressionlist in any of the other Case selections. • Although not required, it is a good idea to have a CaseElse statement in your SelectCase block to handle unforeseen testexpression values. • SelectCase statements can be nested. Each nested SelectCase statement must have a matching EndSelect statement.

  17. Lab 4.1

  18. Lab 4.1 • Write a small program: • Declare a constant PASSWORD • Declare two variables strPsw and Name. • If the password is OK, Wellcome the user in the reporter (micPass) • Else , display a message in the Reporter (micFail) • Use the If…Then…Else Statement

  19. Lab 4.2 • Write a small program: • Declare a variable iNumber • Display in the reporter the name of the number (“one”, “two”) • If the number is not between 0 and 10 display a message “out of range” • Use the select Case statement.

  20. Lab 4.3 • Write a small program: • Declare a variable iNumber, bSign • 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 (Minus two), and for 4 (Plus Four) • Otherwise display a message out of range • Use if..then…End If statement once and Select Case once.

  21. Make sure to visit us • Tutorials • Articles • Projects • And much more www.AdvancedQTP.com

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