Web Technology
10Marks & 5Marks
1. Dictionary Object in VBScript [10 Mark] [5 Mark]
The Dictionary object stores name/value pairs(referred to as the key and item respectively) in an array. The key is a unique identifier for the corresponding item and cannot be used for any other item in the same Dictionary object.
The following code creates a Dictionary object called “cars”, adds some key/item pairs, retrieves the item value for the key 'b' using the Item property and then outputs the outputting string to the browser.
-
Code:
<%
Dim cars
Set cars = CreateObject("Scripting.Dictionary")
cars.Add "a", "Alvis"
cars.Add "b", "Buick"
cars.Add "c", "Cadillac"
Response.Write "The value corresponding to the key 'b' is "
cars.Item("b")
%> -
Output:
"The value corresponding to the key 'b' is Buick"
-
Explanation:
This code creates a Dictionary object called "cars", adds some key/item pairs, retrieves the item value for the key 'b' using the Item property and then outputs the resulting string to the browser.
2. What is procedure in VBScript? How to use it? How to define it? [10 Mark] [5 Mark]
Procedures are small logical components which breaks (splits) the program into a separate task. Procedures can be called inside of another procedure
Procedures can take its arguments, perform a series of operations and changes the values of its arguments.
The benefits of programming with procedures are:
- Debugging can be easily done
- A procedure can act as a building block for another procedure in a program
The general format of the VBScript procedures are as follows:
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Syntax:
Procedure_type Procedure_Name(argument_list)
the procedure heading
declaration statements
execution statements
End Procedure_type -
Example:
<html>
<body>
<script language="vbscript" type="text/vbscript">
Function sayHello()
msgbox("Hello there")
End Function
</script>
</body>
</html>
A procedure can have two parts:
- A declaration statement act as a reservation from the memory cells that are needed to hold data and program output and what kind of information will be stored in each memory cell.
- An execution statement is a statement that is translated into machine language and executed later.
What is VBScript? Explain the salient features of VBScript [10 Mark] [5 Mark]
VBScript (Visual Basic Script) is developed by Microsoft with the intention of developing dynamic web pages. It is client-side scripting language like JavaScript. VBScript is a light version of Microsoft Visual Basic. The syntax of VBScript is very similar to that of Visual Basic. If you want your webpage to be more lively and interactive, then you can incorporate VBScript in your code. [2 Mark]
Features
- VBScript is a lightweight scripting language, which has a lightning fast interpreter.
- VBScript, for the most part, is case insensitive. It has a very simple syntax, easy to learn and to implement.
- Unlike C++ or Java, VBScript is an object-based scripting language and NOT an Object-Oriented Programming language.
- It uses Component Object Model (COM) in order to access the elements of the environment in which it is executing.
- Successful execution of VBScript can happen only if it is executed in Host Environment such as Internet Explorer (IE), Internet Information Services (IIS) and Windows Scripting Host (WSH).
- VBScript is also used for Network Administration, System Administration and for UFT Test Automation.
- If we already know Visual Basic (VB) or Visual Basic for Applications (VBA), VBScript will be very familiar.
- VBScript talks to host applications using Windows Script. With Windows Script, browsers and other host applications do not require special integration code for each scripting component.
String Functions in VBScript [10 Mark] [5 Mark]
InStr: returns the first occurrence of the specified substring. Search happens from left to right.
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Example:
Dim txt
txt = "This is a beautiful day!"
MsgBox InStr(txt, "beautiful")
-
Output:
11
InStrRev: returns the first occurrence of the specified substring. Search happens from Right to Left.
-
Example:
Dim txt
txt = "This is a beautiful day!"
MsgBox InStrRev(txt, "beautiful")
-
Output:
11
Left: returns a specified number of characters from the left side of a string.
-
Example:
Dim txt
txt = "This is a beautiful day!"
MsgBox Left(txt, 15)
-
Output:
This is a beaut
Right: returns a specific number of characters from the right side of the string.
-
Example:
Dim txt
txt = "This is a beautiful day!"
MsgBox Right(txt, 10)
-
Output:
tiful day!
Split: returns a zero-based, one-dimensional array that contains a specified number of substrings.
-
Example:
Dim txt, splitText
txt = "This is a beautiful day!"
splitText = Split(txt)
For each x in txt
MsgBox x
-
Output:
This
is
a
beautiful
day!
Join: returns a string that consists of a number of substrings in an array.
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Example:
Dim days
days = Array("Life", "Is", "Good")
MsgBox Join(days)
-
Output:
Life Is Good
LCase: returns the lower case of the specified string.
UCase: returns the upper case of the specified string.
Trim: returns the string value after removing both leading and trailing blank spaces.
Math Functions in VBScript [10 Mark] [5 Mark]
Date functions helps the developers to convert date from one format to another or to express the date value in the format that suits a specific condition.
Int: returns the integer part of the specified number.
-
Example:
MsgBox Int(6.25475) -
Output:
6
Oct: returns the octal value of the given number.
-
Example:
MsgBox Oct(400) - Output:
620
Hex: returns the hexadecimal value of the given number.
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Example:
MsgBox Hex(400) -
Output:
190
Sqr: returns the square root of the specified number.
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Example:
MsgBox Sqr(9) -
Output:
3
Abs: returns the absolute value of the specified number.
-
Example:
MsgBox Abs(-1) - Output:
1
Log: returns the natural logarithm of a specified number. The natural logarithm is the logarithm to the base e.
Sin: returns the sine value of the specified number.
Cos: returns the cosine value of the specified number.
Tan: returns the tan value of the specified number.
Date Functions in VBScript [10 Mark] [5 Mark]
Date functions helps the developers to convert date from one format to another or to express the date value in the format that suits a specific condition.
Date: returns the current system date.
CDate: converts a valid date and time expression to date object, and returns the result.
DateAdd: returns a date to which a specified time interval has been added.
DateDiff: returns the interval between two dates.
DatePart: returns the specified part of a given date.
IsDate: returns a boolean value which specifies if the given value can be converted to a date object.
Day: returns an integer between 1 and 31 that represents the day of the specified date.
Month: returns an integer between 1 and 12 that represents the month of the specified date.
Year: returns an integer that represents the year of the specified date.
