Web Technologies 0108

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Suggested Answers with Examiner's Feedback

Question Paper

Web Technologies (MC338) : January 2008

Section A : Basic Concepts (30 Marks)

This section consists of questions with serial number

1 - 30.

Answer all questions.

Each question carries one mark.

Maximum time for answering Section A is 30

Minutes.

1. Which of the following options is correct with regard to HTML?

(a) It is a modelling language

(b) It is a DTP language

(c) It is a partial programming language

(d) It is used to structure documents

(e) It is a scripting language.


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5. What would be the colours of the RGB where the hexadecimal values are #FF0000, #00FF00 and #0000FF

respectively?

(a) Blue, Green, Red

(b) Green, Blue, Red

(c) Green, Red, Blue

(d) Red, Blue, Green

(e) Red, Green, Blue.


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JavaScript

var a=80

var b=(a==80 ? "pass" :"fail");

document.write(b )

What will be the output of the above script?

(a) pass

(b) fail

(c) null

(d) 80

(e) Error at line 6.


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(a) 0

(b) 1

(c) 2.083

(d) 3

(e) 25%12.


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(b) blue

(c) black

(d) red

(e) White.


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27. In JSP, a Canvas object provides access to a Graphics object via one of its method called:

(a) getCanvas()

(b) getGraphics ()

(c) paint()

(d) getPaint()

(e) accessGraphics ().


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the HTML code which generates the web page. The form will enable the user to select a course

from the Course list BIT, MSC, PGDipFT and PGDipPT. The topics list contains HTML,JavaScript, PERL and ASP.

( 8 marks)

b. Consider the following XML DTD for a book catalogue.

]>

If this is a valid DTD, explain what each line defines. If not, explain what is wrong. ( 2 marks)

4. a. Explain each of the following XML terms and provide an example XML statement for each of

them.

i. Attribute

ii. Empty Elements

iii. Root

iv. XML Declaration

v. Comments. ( 5 marks)


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ABCDEF

Panja Gutta

Hyd West

500082

West

India

09122222222

09112345678

NimalJayakody

09123456789

( 5 marks)

5. a. Describe the similarities and differences between client side scripting and server side scripting

with respect to browser dependence, database access, response time, authentication, security and

script execution along with the advantages and disadvantages. ( 7 marks)


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Suggested Answers

Web Technologies (MC338) : January 2008

Section A : Basic Concepts

Answer Reason

1. D All the other options are wrong and incorrect for the question asked. < TO

2. E All the other options are wrong and incorrect for the question asked. < TO

3. E Server error 403 means insufficient permission. < TO

4. A All the other options are correct for the question asked. < TO

5. E The values are hexadecimal equivalent for Red, Green, Blue. < TO

6. C According to the specifications of and they are used to define the contents inline or

block level.

< TO

7. D As the remaining all the options are correct and valid for JavaScript. < TO

8. A Because of the comment nothing will be printed. < TO

9. E According to the definitions of browser objects, all the statements are true. < TO

10. A Because the outcome of the ternary operator. < TO

11. D Because book[1] prints 2 and book[10] prints 10 < TO

12. A Because cookies are not programs. < TO

13.B 125/5 is 25 and 25%12 is 1(Remainder) < TO

14. B All the other options are wrong and incorrect for the question asked. < TO

15. C All the other options are wrong and incorrect for the question asked. < TO

16. B Promt( ) is used to get input text from the user. < TO

17. A All the other options are wrong and incorrect for the question asked. < TO

18. D All the other options are wrong and incorrect for the question asked. < TO

19. B Because for applying styles to text of a paragraph P is used in CSS. And hence the text is printed in

Blue color.

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20. E According to the CSS syntax for text alignment.< TO

21. B Event handlers in JavaScript can t be associated with end of file processing for a database application. < TO

22. A In JSP setLayout() method is used to specify a container's layout. The remaining all the options are

incorrect.

< TO

23. B Component. setBounds ()isused to set the position and size of a component in JSP. < TO

24. C According to the semantic of the readLine() method, it returns null when it reaches the end of a file in

JSP.

< TO

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25. D In JSP Vector class is used implement a growable array of objects. < TO

26. E According to the definition of the wrapper class. < TO

27. C According to the definition of the paint() method, The remaining all the options are wrong. < TO

28. B According to the definition of the Date() method of ASP, The remaining all the options are wrong. < TO

29. D According to the definition of the FormatDateTime() method of ASP, The remaining all the optionsare wrong.

< TO

30. A In ASP, IsNumeric() function returns a Boolean value that indicates whether a specified expression

can be evaluated as a number.

< TO

Section B : Problems

1. a. Cursor position in javascript

Find Cursor Position

function show_coords(event )

{

x=event.clientX ;

y=event.clientY ;

alert("X coords: " + x + ", Ycoords: " + y);

}

Click in the document. An alert box will alert the x and y coordinates of the cursor.

b. html>

Note: This example won't work because ASP 3.0 is not installed on our server.

NOTE: Because the content strings are changed randomly in the text file, and this page has only four contentstrings to choose from, sometimes the page will display the same content strings twice in a row.

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2. a. You can use the errorPage attribute of the page directive to have uncaught runtime exceptions automatically

forwarded to an error processing page. For example:

redirects the browser to the JSP page error.jsp if an uncaught exception is encountered during request

processing. Within error.jsp, if you indicate that it is an error-processing page, via the directive:

the Throwable object describing the exception may be accessed within the error page via the exception

implicit object.

Note: You must always use a relative URL as the value for the errorPage attribute

b. Simple Object Access Protocol is a communication protocol used for communication between applicationsby sending messages via Internet. SOAP is platform and language independent and is based on XML.

A SOAP message is an ordinary XML document containing the following elements:

A required Envelope element that identifies the XML document as a SOAP message

An optional Header element that contains header information

A required Body element that contains call and response information

An optional Fault element that provides information about errors that occurred while processing the

message

All the elements above are declared in the default namespace for the SOAP envelope:

http://www.w3.org/2001/12/soap-envelope

and the default namespace for SOAP encoding and data types is:

http://www.w3.org/2001/12/soap-encoding

Syntax Rules

Here are some important syntax rules:

A SOAP message MUST be encoded using XML

A SOAP message MUST use the SOAP Envelope namespace

A SOAP message MUST use the SOAP Encoding namespace

A SOAP message must NOT contain a DTD reference

A SOAP message must NOT contain XML Processing Instructions

Skeleton SOAP Message

...

...

...

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3.

Web Technologies exam - MC333 Jan-2008

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Login Name:

Password :

Course :

BITPG Diploma

MSC

Topics to Cover:

HTML

JavaScript

PERL

Security

Protocols

Method of Payment:

cash

MasterCard

Visa

Cheque

Preferred time slots:

08:00-11:00 on Fridays



10:00-13:00 on Saturdays

b. It is valid:

Line 1 gives the name of the document type catalogue.

Line 2 defines that a catalogue consists of one or more books.

Line 3 says that a book consists of its authors, title, publisher and year.

Lines 4, 5, 6 & 7 say that each of these is of string type.

4. i. It is possible to attach additional information to elements in the form of attributes. Attributes have a nameand a value.

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ii. Elements that have no content are knows as empty elements. Usually, they are enclosed in the document for

the value of their attributes.

iii. At the root of the document there must be one and only one element. In other words, all the elements in the

document must be the children of a single element.

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Kamal

2456789

iv. The XML declaration is the first line of the document. The declaration identifies the document as an XMLdocument.

v. Comments are used for notes.

b.

5. Similarities:

Both are dynamic.

Can be used to enhance the functionality of the web page like user interaction

Differences

Client side scripting Server side scripting

Bowser Browser dependant Browser independant

Database Cannot access database Can access database

Response Depends on the client machine

speed

Depends on the server and network speed

Authentication Authentication cannot be done Authentication can be done

Security Security problems are less

dangerous

Security problems are dangerous

Script Downloaded, interpreted and

executed by the client browser

User can view the code

Run on the server and output is displayed

on the client browser User only can view

the rendered HTML page

Advantage Validation is instantaneous and

catches any erroneous data

before it goes anywhere.

Browser independent.

Disadvantage Browser dependent, therefore

generated results also browserdependent. If the browser

disabled or not supported, datavalidation not occur at all

The data has to be send back and forth

between the browser and server thereforetake time

b.

Function Description

Asc Converts the first letter in a string to ANSI code

CBool Converts an expression to a variant of subtype Boolean

CByte Converts an expression to a variant of subtype Byte

CCur Converts an expression to a variant of subtype Currency

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CDate Converts a valid date and time expression to the variant of subtype Date

CDbl Converts an expression to a variant of subtype Double

Chr Converts the specified ANSI code to a character

CInt Converts an expression to a variant of subtype Integer

CLng Converts an expression to a variant of subtype Long

CSng Converts an expression to a variant of subtype Single

CStr Converts an expression to a variant of subtype String

Hex Returns the hexadecimal value of a specified number

Oct Returns the octal value of a specified number

Section C: Applied Theory

6. Benefits of Using CSS

Separation of Style and Structure

Consistency in Style

Condensed Code

ease of maintenance

Flexible Design increase accessibility

Easier Modification

Allows additional features, e.g. dynamic capabilities

Recommended standard - assures compatibility with present & future designs

Reduce use of non-standard tags

One CSS multiple Web pages

Offers much more detailed attributes

Faster download time

Reasons for Using CSS

1. Build from the ground up to replace traditional Web design methods

2. Faster download times

3. Shorter development time

4. Greater control over the typography in a Web page

5. It's easy to write

6. Improvements in accessibility

7. Print designs as well as Web page designs

8. Better control over the placement of elements in Web page

9. The design of Web pages is separated from the content

10. Better search engine rankings

Drawbacks of Using CSS

Browsers slow to adopt (a shrinking issue) Tools slow to adopt (a shrinking issue)

One more thing to learn and apply

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7. a. The jsp:plugin element instructs the server to build a tag appropriate for applets that use the plug-in. The

simplest way to use jsp:plugin is to supply four attributes: type, code, width, and height.

The jsp:plugin element has a number of other optional attributes. Most, but not all, parallel attributes of the

APPLET element. Here is a full list.

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type

For applets, this attribute should have a value of applet. However, the Java Plug-In also permits you to

embed JavaBeans elements in Web pages. Use a value of bean in such a case.

code

This attribute is used identically to the CODE attribute of APPLET, specifying the top-level applet class

file that extends Applet or JApplet . Just remember that the name code must be lower case with

jsp:plugin (since it follows XML syntax), whereas with APPLET, case did not matter (since HTML

attribute names are never case sensitive).

width

This attribute is used identically to the WIDTH attribute of APPLET, specifying the width in pixels to

be reserved for the applet. Just remember that you must enclose the value in single or double quotes.

height

This attribute is used identically to the HEIGHT attribute of APPLET, specifying the height in pixels to

be reserved for the applet. Just remember that you must enclose the value in single or double quotes.

b. The jsp:fallback element provides alternative text to browsers that do not support OBJECT or EMBED. You

use this element in almost the same way as you would use alternative text placed within an APPLET element.

Error: this example requires Java.

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