Select Case If Else Condition Do Loop While Wend For Next Arrays Use of VB Script, VBScript in QTP

Select Case If Else Condition Do Loop While Wend For Next Arrays Use of VB Script, VBScript integration with QTP

In this section we will discuss about conditional constructs, looping constructs and Arrays

So for Conditional constructs like -: These are the execute statement or repetitive certain set of code statements totally based upon condition.

So now given below is the conditional construct which are available for VB Script

→ If – then - Else Condition

→ Select Case Condition

If – Then – Else Constructs

The If Then Else constructs are used to decide or evaluate whether a condition is required to execute which is false or true. All these are decided by the condition during the execution time mean this is dynamic condition which work like that. So The – If Then else statement can be nested on level to level down

For Example:

Sub

Report Value(value)If value = 0 Then MsgBox value

Else If value = 1 Then MsgBox value

Else If value = 2 Then Msgbox value

Else Msgbox "Value out of range!"

End If

As per above example we can add multiple Else If clauses according to requirement, We also can use Select Case constructs to avoid such type of repetitive. This will be an alternative.

Select Case Condition

Definitely Select case is the best alternative of If then else. Actually Select case condition code create more efficient and readable code for user.

Actually Select Case structures work with a one test expression or condition that will be evaluate only once. Which will be at the top of the all complete structure. So result of execution then will be compared with the value of each Case in the available structure. If found any match then associated statements with that specific Case will be executed.

Following is the good Example of Select Case:

Select Case Document.Form1.CardType.Options(Selected Index).Text

Case “Master Card”

DisplayMC Logo

ValidateMCAccount

Case “Visa Card”

DisplayVisaCardLogo

ValidateVisaAccount

Case “American Express Card”

DisplayAMEXCardOLogo

ValidateAMEXCardOAccount

Case Else DisplayUnknownImage PromptAgain

End Select

Looping constructs:

AS it name suggest, Execution the group of statement repeatedly. This type of loop will be totally based on condition. Here loop will executed as long as condition will become true. Following are the main Iterative constructs available :

→ Do Loop

→ While Wend

→ For Next

Do Loop Condition:-

This type of statement is used to run the black of statements based on a conditions. These loop will continue until the condition will not become or satisfied to True. The Keyword While is used to confirm the conditions in this Do Loop condition.

This condition can be tested before entry into the loop or after the execution at least once.

While Wend Condition:

This condition is used by them who are the familiar with the VB Script or its usage. Because this condition have less flexibility that’s why it has not much use.

For … Next Condition:

The For Next loop can use to run a code block of statement for specific numbers of times. For this loop need to use a counter variable whose values can be increased or decreased with each repetition of the loop. The Step Keywords is used to increase or decrease the value of counter variable that is specified along with it. The For Next statement can terminate before the counter reaches its end value by using the Exit For statement.

For example:
Dim je, total
For je = 1 To 10 Step 2

Atotal = Atotal + j

Next
MsgBox “Your total is ” & total

Arrays → Array is like a connected area in the available memory refer by the general name.

Actually it is the variables having same type of datatype. Arrays are used to saved the related data value Therefore arrays are called Same data type values.

Declaring the Arrays →

We generally used two types of Arrays →

1. Local Array: Local array can be declared only based on function or procedure where it need to execute. It works within the function or procedure.
2. Global Arrays → Global array can be declared as globally which can be used whatever user desire either any place.
   A global array is an array that can be used by all functions and procedures. It is declared at the beginning of the VBScript Code

Example of Array:

Dim No_Passenger(4)

The No_Passengers can Save 5 values.

Assigning values to the array

No_Passengers(0) = 1
No_Passengers(1) = 2

No_Passengers(2) = 3

No_Passengers(3) = 4

No_Passengers(4) = 5

Static And Dynamic :

VBScript gives flexibility to declare arrays either static or dynamic.

A static arrays have some limited number of element. The size of a static array can not be changed at run time.

A dynamic array can be re sized at any time. Dynamic arrays are very useful when size of the array can not be decided. Then the array size can be changed during run time.

In the Next Posts we will discuss about user defined functions, procedures and sub Routines.

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