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Home Architecture, security and coding .Net: Ajax, multiple timers on one page
.Net: Ajax, multiple timers on one page
Written by Division by Zero   
Saturday, 21 November 2009 12:12

A while ago I was building  web application with multiple timers on one page (in different usercontrols, which had to work independently). I thought it worked, but after some debugging I found out that only one timer event worked. After a callback the other timer started to count from the beginning. So, this is the solution I came up with (and I haven't found or thought of a better one).

private int GetCorrectedInterval()
 {
 int interval = DefaultRefreshTime;
 interval *= 1000;

 // If a page has multiple timers, the timers that didn't fire an event
 // will be reset. This will correct the interval, so this timer will fire sooner
 ScriptManager scriptManager = ScriptManager.GetCurrent(this.Page);
 if (!scriptManager.AsyncPostBackSourceElementID.Contains(UpdatePanelTimerId))
 {
 // This timer didn't fire
 if (Session["LastTimerEvent"] != null)
 {
 DateTime lastFireDate = (DateTime)WebSession.ApplicationSession[SessionLastTimerEvent];
 TimeSpan diff = DateTime.Now.Subtract(lastFireDate);

 interval -= (int)diff.TotalMilliseconds;
 if (interval < 1)
 interval = 10;
 }
 else
 Session["LastTimerEvent"] = DateTime.Now;
 }
 else // This timer did fire, set the session value
 Session["LastTimerEvent"] = DateTime.Now;

 return interval;
 }
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