- 2 points each
- DOM parser
- Expat parser
- SimpleXML parser
- Regular expressions
- 2 points each
- Regular Expressions
- 4 points for properly explaining the cascade and 2 points each
for properly explain the three factors that determine the cascade.
The cascade is the process by which a virtual style-sheet is assembled for
an element via inheritance, specificity, and location. Inheritance
can be used to determine the values of unspecified styles while
specificity and location can be used to resolve conflicts between
is the process by which CSS properties applied to one tag are
passed on to nested tags.
- Specificity refers to the tie breaking
procedure used when multiple styles apply to the same tag. In this
case the most specific selector is used.
- Location refers to
the tie breaking procedure used when
there is equal specificity between one or more selectors.
In this case, the last style to be specified in physical order wins.
partial credit assigned for the clarity of the answer and explaining
why the limitation is either an advantage or is mitigated on the
- It cannot write to files: This makes it safe to run on the client-side
modify the user's file system.
be run with a graphical interface, so formatted output is not
will receive input from a graphical form, so reading from the
input from the user via the prompt command.
- 2 points for telling me the feature, which is system-related
commands, and 3 points for telling me that the commands are
system-independent, thus lending themselves to portablity across
Perl became popular with system administrators because it included
system-independent commands, such as rename or unlink,
for manipulating the file system. This
meant they could write general scripts that would run on any operating
system. Prior to Perl, they had to worry about finding which directory
contained the Unix commands they were using and include it in the path
variable. Additionally, if they wanted the script to run on both Windows
and Unix platforms, then they had to have the script test some variable
to see which platform they were running on, and then use the appropriate
- 2 ways in which the prototype-instance model differs from the
4 points for each difference, with credit depending on the clarity
and conciseness of the answer.
- prototypes are actual objects that exist at run-time
whereas classes represent templates from which objects may be
created, but they are not objects themselves.
- prototypes allow properties to be dynamically added and deleted to
both the prototype or the instance, whereas the instance variables
in a class are a fixed set that can neither be added to nor subtracted
from at runtime.
- 2 sample Ajax applications and how I would use Ajax to implement them:
2 points each for the applications and 4 points each for giving
me a clear, concise, and specific description of what parts of the
application would use Ajax.
and a server side written in PhP. Ajax can be used to
incrementally remove mail items from the list, add mail items to
the list in response to queries to the server, display email messages,
etc. Each request--delete, fetch new mail, display mail message--can
be handled with requests to the server followed by updating the
email form presented to the user. You might launch requests to fetch
new mail every few seconds using a timer.
- Polling: Many web-sites, such as American Idol or news sites, allow
users to respond to poll questions without having to reload the
entire page. This is done by sending an Ajax request to the server
the vote tallies when the user presses an appropriate radio button
and using a timer object to periodically send requests to the server
to retrieve updated vote counts.
salestax form element. Since the sales tax is a text for element, we
can change its value by changing the value field.
If the sales tax is greater than 50, it also
displays the amount in a red font.
salestax_amt = parseInt(amount.value) * parseFloat(taxrate.value)
salestax.value = salestax_amt.toString()
if (salestax_amt > 50)
salestax.style.color = 'red'
salestax.style.color = 'black'
- (4 points): Correct calculation of the salestax amount including
extracting the values from the appropriat1e form elements.
- (4 points): Correctly assigning the salestax amount to the
salestax form element
- (4 points): Correctly setting the color of the salestax form
element to red if the salestax
reflect the computed sales tax:
(5 points) The two important elements of this question involve
using getElementById to retrieve the tax element and using either
the innerHTML or the firstChild.nodeValue properties.
document.getElementById('tax').innerHTML = salestax_amt;
document.getElementById('tax').firstChild.nodeValue = salestax_amt.toString();
- 3 points for part a and 6 points each for parts b and c. The amount
of credit you receive depends on how fully your answer complies with the
request of the problem..
mysql_connect("schools.com", "cs460", "correct");
SELECT QuestionText, Answer
WHERE Course = 'CS302';
SELECT Questions.QuestionText, Options.OptionText
FROM Questions, Options
WHERE Questions.Course = 'CS302' and Questions.Answser = Options.OptionId;