Introduction of VBScript
This post gives a birds eye view(vbscript basics) documentation on VBscript. This post will cover VBScript for Automation Testing.It gives a brief details about VBScript Tutorial for vbscript learning. If you want to be the master of VBScript, the only best way to learn is to go through several scripts over internet and MSDN document. This post will cover the concepts that we need for Automation testing via UFT.It will also clear your basic vbscript syntax.
The topics to be covered in this tutorials are as follows:
- Introduction of VBScript
- Basics of VBScript
- Create your script from scratch
- How to enhance your script?
- Looping in VBscript
- Conditions in VBScript
- Data Types in VBScript
- Variables in VBScript
- How to Use comments in VBScript?
- Function and subroutine in VBScript
- Work with constants in VBScript
- VBScript documentation standards
- How to work with VBScript array?
- What is WSH?- Basic window administration.
- Introduction to File System Object(FSO)
- Basic of WMI
- VBScript Runtime errors and Syntax errors.
- Debugging VBScripts
- Error Handling in VBScript
- Introduction to Dictionary Object
- Regular expression in VBScript
VBScript for Automation Testing/VBScript Tutorial/vbscript learning/vbscript basics/vbscript syntax
VBScript is an interpreted scripting language. VBScript needs an execution environment in order to execute.
VBScript execution environments-
- Internet Explorer (Outside of this discussion)
- WSH(We will discuss)
- IIs and ASP(Classic)
- Outlook
- Microsoft Windows Script console
What is WSH?- Basic window administration.
WSH is the technique by which we can automate many windows related operations.
What WSH can do?
- Create new user account
- Managing the windows file system
- Create shortcuts
- Managing local drives and printers.
- Managing network drives and printer.
- Reporting system and status information.
- Interact with other application.
How to Use Comment in VbScript?
Comments guide us on what the developer wanted to do with the code i.e the purpose of the code.We can add comments to our statements using an apostrophe (‘), either at the beginning of a separate line, or at the end of a statement. It is recommended that we add comments wherever possible, to make our scripts easier to understand and maintain.
Data Types in VBscript
Like any other programing language VBScript also support Data types.
Variables in VBScript
VBScript supports variable concept just like any other language.We can specify variables to store strings, integers, arrays and objects. Using variables helps to make our script more readable and flexible
Work with constants in VBScript
VBscript supports constants of different types.
VBScript Function and Sub Procedure
VBscript allows all to run same and repetitive tasks in the form of functions which can return some value and sub procedure which does not return any value.
Loop and Conditions in VBScript
Using loop and conditions we can put intelligence into the script.
Introduction to File System Object(FSO)
FSO provides us the ability to work with files and folders. FSO will also covers on how to work with folders.
Debugging VBScripts
The art of debugging is an equally important factor while writing VBScript.
Errors and Error Handling in VBScript
Errors and Error handling is another component that whose knowledge minimizes the maintenance effort.
Introduction to Dictionary Object
Dictionary object is the list containing key value pairs.
Regular expression in VBScript
Regular expression in VBScript allows to work with patterns for input and output verifications.
VBScript syntax rules and guidelines
Case-sensitivity:
By default, VBScript is not case sensitive and does not differentiate between uppercase and lowercase spelling of words, for example, in variables, object and method names, or constants.
For example, the two statements below are identical in VBScript:
Browser("Mercury").Page("Find a Flight:").WebList("toDay").Select "31"
browser("mercury").page("find a flight:").weblist("today").select "31"
Text strings:
When we enter a value as a text string, we must add quotation marks before and after the string. For example, in the above segment of script, the names of the Web site, Web page, and edit box are all text strings surrounded by quotation marks.
Note that the value 31 is also surrounded by quotation marks, because it is a text string that represents a number and not a numeric value.
In the following example, only the property name (first argument) is a text string and is in quotation marks. The second argument (the value of the property) is a variable and therefore does not have quotation marks. The third argument (specifying the timeout) is a numeric value, which also does not need quotation marks.
Browser("Mercury").Page("Find a Flight:").WaitProperty("items count", Total_Items, 2000)
Parentheses:
To achieve the desired result and to avoid errors, it is important that we use parentheses () correctly in our statements.
Indentation:
We can indent or outdent our script to reflect the logical structure and nesting of the statements.
Spaces:
We can add extra blank spaces to our script to improve clarity. These spaces are ignored by VBScript.
Input/Output Operations in VBScript
InputBox Function
Displays a prompt in a dialog box, waits for the user to input text or click a button, and returns the contents of the text box.
Example:
Dim Input
Input = InputBox("Enter your name")
MsgBox ("You entered: " & Input)
MsgBox Function
Displays a message in a dialog box, waits for the user to click a button, and returns a value indicating which button the user clicked.
Example:
Dim MyVar
MyVar = MsgBox ("Hello World!", 65, "MsgBox Example")
‘ MyVar contains either 1 or 2, depending on which button is clicked.
