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set timer for vf page( like online exam)

Hi all,


  my senario is like online exam.   I developed one   vf page for displaying  20 questions(records) from question obeject .  i need to   set  timer  for vf page ,  suppose  i am having   20 questions in vf page . i nedd to set 20 min . after twenty 20 min that visual force page  should not appeared  , i can only show the result. How to set the timer for visual force page  ,plz  any on help me




  You can use your timer to set a boolean field once the time has expired.  You can break your VF page down into 2 different <apex:outputpanel> blocks and selectively render one or the other by using <apex:outputpanel rendered="{!showtest}"> with showtest being a property in your page's controller



public class pgcontroller{
	public boolean showtest{
			//code goes here that query's database to see if test time has expired and returns true/false accordingly
		private set;




Kind Regards,



Tyler Hudson
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Thanks  for replay,



     i am in torouble with time,  i don't know how  to calculate time ,   as  you said i can use  output panels,how can   test  if tes has expired time or not,    how to to construct  time