mod/quiz/quiz.js

   1 /*
   2  * JavaScript library for the quiz module.
   3  *
   4  * (c) The Open University and others.
   5  * @author T.J.Hunt@open.ac.uk and others.
   6  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
   7  */
   8
   9 /* Used by quiz navigation links to force a form submit, and hence save the user's data. */
  10 function navigate(page) {
  11     var ourForm = document.getElementById('responseform');
  12     ourForm.action = ourForm.action.replace(/page=.*/, 'page=' + page);
  13     if (ourForm.onsubmit) {
  14         ourForm.onsubmit();
  15     }
  16     ourForm.submit();
  17 }
  18
  19 /* Use this in an onkeypress handler, to stop enter submitting the forum unless you
  20 are actually on the submit button. Don't stop the user typing things in text areas. */
  21 function check_enter(e) {
  22     var target = e.target ? e.target : e.srcElement;
  23     var keyCode = e.keyCode ? e.keyCode : e.which;
  24
  25     if(keyCode==13 && (!target.type || (target.type!='submit' && target.type!='textarea')))
  26         return false;
  27     else
  28         return true;
  29 }
  30
  31 /* Used to update the on-screen countdown clock for quizzes with a time limit */
  32 function countdown_clock(theTimer) {
  33     var timeout_id = null;
  34
  35     quizTimerValue = Math.floor((ec_quiz_finish - new Date().getTime())/1000);
  36
  37     if(quizTimerValue <= 0) {
  38         clearTimeout(timeout_id);
  39         document.getElementById('timeup').value = 1;
  40         var ourForm = document.getElementById('responseform');
  41         if (ourForm.onsubmit) {
  42             ourForm.onsubmit();
  43         }
  44         ourForm.submit();
  45         return;
  46     }
  47
  48     now = quizTimerValue;
  49     var hours = Math.floor(now/3600);
  50     now = now - (hours*3600);
  51     var minutes = Math.floor(now/60);
  52     now = now - (minutes*60);
  53     var seconds = now;
  54
  55     var t = "" + hours;
  56     t += ((minutes < 10) ? ":0" : ":") + minutes;
  57     t += ((seconds < 10) ? ":0" : ":") + seconds;
  58     window.status = t.toString();
  59
  60     if(hours == 0 && minutes == 0 && seconds <= 15) {
  61         //go from fff0f0 to ffe0e0 to ffd0d0...ff2020, ff1010, ff0000 in 15 steps
  62         var hexascii = "0123456789ABCDEF";
  63         var col = '#' + 'ff' + hexascii.charAt(seconds) + '0' + hexascii.charAt(seconds) + 0;
  64         theTimer.style.backgroundColor = col;
  65     }
  66     document.getElementById('time').value = t.toString();
  67     timeout_id = setTimeout("countdown_clock(theTimer)", 1000);
  68 }
  69
  70 /* Use to keep the quiz timer on-screen as the user scrolls. */
  71 function movecounter(timerbox) {
  72     var pos;
  73
  74     if (window.innerHeight) {
  75         pos = window.pageYOffset
  76     } else if (document.documentElement && document.documentElement.scrollTop) {
  77         pos = document.documentElement.scrollTop
  78     } else if (document.body) {
  79         pos = document.body.scrollTop
  80     }
  81
  82     if (pos < theTop) {
  83         pos = theTop;
  84     } else {
  85         pos += 100;
  86     }
  87     if (pos == old) {
  88         timerbox.style.top = pos + 'px';
  89     }
  90     old = pos;
  91     temp = setTimeout('movecounter(timerbox)',100);
  92 }