From jacobson@math-cs.cns.uni.edu Wed Jun 19 10:39:38 2002
Date: Wed, 19 Jun 2002 10:33:04 -0500 (CDT)
From: Mark Jacobson <jacobson@math-cs.cns.uni.edu>
To: 810-088-06@uni.edu
Subject: cookie12.html modifications

Hi 088 students,

   The URL http://www.cns.uni.edu/~jacobson/js/cookie12.html

is a modification of the cookie1.html web page, as discussed in class
today.  Here is the new code:

          i = 0;

          while ( !document.f1.elements[i].checked ) i++;

          document.bgColor = document.f1.elements[i].value;

   These 3 lines of code replace this cookie1.html code.
   (Note:  You have cookie1.html as a handout from today's class).

          if (document.f1.elements[0].checked) { c = 0; }
          else if (document.f1.elements[1].checked) { c = 1; }
          else if (document.f1.elements[2].checked) { c = 2; }
          else if (document.f1.elements[3].checked) { c = 3; }
          else if (document.f1.elements[4].checked) { c = 4; }
          else if (document.f1.elements[5].checked) { c = 5; }
          else if (document.f1.elements[6].checked) { c = 6; }
          else if (document.f1.elements[7].checked) { c = 7; }

          document.bgColor = document.f1.elements[c].value;

    The 9 lines of code are replaced by using a while loop to
    iterate the variable i over the radio buttons until the
    one that is checked is discovered.

    There is one other change in the cookie12.html version of
                                     cookie1.html.  It now accepts
                                     m, M, f, or F for gender,
                                     by adding the single statement:

                                     gender = gender.toLowerCase();
         if (!document.cookie)
         {
            n = window.prompt('Enter your name','name?');
            do
            {
               gender = window.prompt('What is your gender? '  +
                                      'male or female - use m or f',
                                                            'M or F');
               gender = gender.toLowerCase();

            } while (gender != "m" && gender != "f");

            document.cookie = "Name=" + n + "&" + "Gender=" + gender;
         }



    Hands-on class tommorrow (Thursday), in Wright 112 lab.

    Assignment2 will be ready on the web page later today, probably
    by early this afternoon.  It will not be due until next Tuesday.

    Mark