Countdown Timer For Online Exam

Question

User1223035165 posted

Hello,
 
I am designing Online Examination System. For this I need a count down timer which does not start from beginning. Suppose timer has started from 40 minutes if the user refreshed the page at when the timer showing at 20 minutes then timer will be continue from 20 minutes. And there is also another case if the user is giving the exam and due to any problem if the user not able to continue the exam, if the user again starts the exam then the exam start from where he have left the exam and timer also starts from the remaining time left where he had left the exam.
 
Can any one suggest how can I achieve the goal.
 
Thanks,
Deepak Pandey

Answer 1

User522486851 posted

there are two timers available with .asp for this

http://msdn.microsoft.com/en-us/library/system.threading.timer.aspx 

implement true threading

http://msdn.microsoft.com/en-us/library/system.web.ui.timer.aspx

and timer control

Answer 2

User-525015206 posted

I think making a User specific Session variable for the counter may do your job.

Also, if the user selects to continue after some time, then he/she can save its current status, and at that time, save the status in Database.

Next, when he continues, update the Session Counter variable based on the status saved in Database.

For more information, please refer to the following link:

http://www.dotnetspider.com/resources/42860-Create-Online-Exam-Project-with-ASP-Net-C-Net.aspx

Hope this helps!

Regards,

Varun Shringarpure

Answer 3

User-448512826 posted

Hi,

Add to the aspx file between the <form> tags:
   <span id="timerDisplaySpan"></span>
   <input type="hidden" id="timeAllocated" name="timeAllocated" value="30" runat="server">

That adds this to the CodeBehind file:
   protected System.Web.UI.HtmlControls.HtmlInputHidden timeAllocated;

You can then set the timeAlloted control in Page_Load:
   if ( !IsPostBack )
        timeAllocated.Value = value-from-database.ToString();

Then add this JavaScript:

<script language="JavaScript">
<!--
function window::onload()
{
 var timeAlloted = 30;

 if ( document.getElementById('timeAllocated').value.length > 0 )
  timeAlloted = parseFloat(document.getElementById('timeAllocated').value);
 else
  document.getElementById('timeAllocated').value = timeAlloted;

 document.getElementById('timerDisplaySpan').innerHTML = 
  '<b>Time Remaining: ' + timeAlloted + " Minutes.</b>";
 
 // 1000 = 1 second...
 window.setInterval('decrementTimer()', 60000);
}

function decrementTimer()
{
 var timeAlloted = parseFloat(document.getElementById('timeAllocated').value);
 timeAlloted--;
 document.getElementById('timeAllocated').value = timeAlloted;

 document.getElementById('timerDisplaySpan').innerHTML = 
  '<b>Time Remaining: ' + timeAlloted + " Minutes.</b>";
}
// -->
</script>

refer...

http://forums.asp.net/t/964256.aspx/1