COM271, Week 9

JavaScript Programming

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Answer these questions by reviewing the notes for week 9.

1. State one compelling reason to use javascript for client-side form validation.
2. State one compelling reason to use a server-side technology for form validation.
3. Define global scope.
4. Define local scope.
5. For the following code, what values of "X1" and "X2" appear in the alert boxes?
   <script>
   function gofigure()
   {
   x=2;
   doubleit(x);
   alert('X2 = '+x);
   }
   
   function doubleit(x)
   {
   x=x*2;
   alert('X1 = '+x);
   }
   </script>
   Hint: After you've thought this through, Try it!, then go back and rethink, if necessary.
6. Given images rollover1.jpg and rollover2.jpg, write a line of html using javascript to create a graphics-based menu item with a rollover effect? (2 points, one for mouse over and one for mouse off.)
7. Create a regular expression pattern and assign it to a variable, then use the variable (and its .test method) to determine whether a string contains the characters ".org" (requires at least 2 statements of code).
8. Write a combination of html, javascript, and css to create a remote rollover effect (roll over image here to create dynamic effect there); an example of a rollover effect would be a change in text color or background color. Before submitting your answer, actually code this so that you know that it works. (3 points)

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These questions are worth points as indicated; Total points this review = 10. At the end of the course, total points will be added, divided by 100, and that fraction will be applied to 20% of your grade (maximum points from reviews is 20% of grade). See Assignments and Grading.