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     if (keyCode==13 && target.nodeName.toLowerCase()!='a' &&
  25             (!target.type || !(target.type=='submit' || target.type=='textarea'))) {
  26         return false;
  27     } else {
  28         return true;
  29     }
  30 }
  31
  32 /* Used to update the on-screen countdown clock for quizzes with a time limit */
  33 function countdown_clock(theTimer) {
  34     var timeout_id = null;
  35
  36     quizTimerValue = Math.floor((ec_quiz_finish - new Date().getTime())/1000);
  37
  38     if(quizTimerValue <= 0) {
  39         clearTimeout(timeout_id);
  40         document.getElementById('timeup').value = 1;
  41         var ourForm = document.getElementById('responseform');
  42         if (ourForm.onsubmit) {
  43             ourForm.onsubmit();
  44         }
  45         ourForm.submit();
  46         return;
  47     }
  48
  49     now = quizTimerValue;
  50     var hours = Math.floor(now/3600);
  51     now = now - (hours*3600);
  52     var minutes = Math.floor(now/60);
  53     now = now - (minutes*60);
  54     var seconds = now;
  55
  56     var t = "" + hours;
  57     t += ((minutes < 10) ? ":0" : ":") + minutes;
  58     t += ((seconds < 10) ? ":0" : ":") + seconds;
  59     window.status = t.toString();
  60
  61     if(hours == 0 && minutes == 0 && seconds <= 15) {
  62         //go from fff0f0 to ffe0e0 to ffd0d0...ff2020, ff1010, ff0000 in 15 steps
  63         var hexascii = "0123456789ABCDEF";
  64         var col = '#' + 'ff' + hexascii.charAt(seconds) + '0' + hexascii.charAt(seconds) + 0;
  65         theTimer.style.backgroundColor = col;
  66     }
  67     document.getElementById('time').value = t.toString();
  68     timeout_id = setTimeout("countdown_clock(theTimer)", 1000);
  69 }
  70
  71 /* Use to keep the quiz timer on-screen as the user scrolls. */
  72 function movecounter(timerbox) {
  73     var pos;
  74
  75     if (window.innerHeight) {
  76         pos = window.pageYOffset
  77     } else if (document.documentElement && document.documentElement.scrollTop) {
  78         pos = document.documentElement.scrollTop
  79     } else if (document.body) {
  80         pos = document.body.scrollTop
  81     }
  82
  83     if (pos < theTop) {
  84         pos = theTop;
  85     } else {
  86         pos += 100;
  87     }
  88     if (pos == old) {
  89         timerbox.style.top = pos + 'px';
  90     }
  91     old = pos;
  92     temp = setTimeout('movecounter(timerbox)',100);
  93 }