Validating an input from the user

'The following code illustrates how an input can be validated in VBScript. This example program demonstrates how to validate for a numeric value between 5 and 10

nInputNumber=inputbox("Enter a number between 5 and 10")

'Validate the input (if it is a valid number)

bFlag=False

Do While bFlag=False

   If isNumeric(nInputNumber) Then 'Valid number

      If nInputNumber<=10 Then 'Lesser than 10

         If nInputNumber>=5 Then  'Greater than 5
            bFlag=True
         Else
            bFlag=False
            nArrayBound=inputbox("Enter a number greater than or equal to 5")
         End If

      Else

         bFlag=False
         nArrayBound=inputbox("Enter a number Less than or equal to 10")

      End If
   Else

      bFlag=False
      nArrayBound=inputbox("Enter a valid number")

   End If
Loop

Msgbox "All Conditions Satisfied"

Program Explained:

The above code illustrates how an input can be validated in VBScript. This example program demonstrates how to validate for a numeric value between 5 and 10. I have explained the executable lines below:

Line 3: We use an Input box to get a value from the user and store it in a variable nInputNumber

Line 7: We set the bFlag variable as false, this variable is a falgging boolean varible which will be set as true when our conditions are satisfied.

Line 9: (Do Loop) Looping the statements until our conditions are satisfied (Numeric Value & greater than or equal to 5 & less than or equal to 10)

Line 11: (If isNumeric(nInputNumber)) Checking for condition 1 - Is it a number?

Line 13: (If nInputNumber<=10) Checking for condition 2 - Is it Less than or equal to 10?

Line 11: (If nInputNumber<=10) Checking for condition 1 - Is it Greater than or equal to 5?

Lines 16,18,24,30: Setting the bFlag (Flag) variable as True/False according to whether or not the condition is satisfied.

Lines 19,25,31: Throwing of appropriate error message back to the user and getting a new input from the user

Line 36: Message box confirming that it is out of loop and all the conditions are satisfied.

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