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view examples/countdown.ur @ 17:2947170fcfd6

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Fix sign error in clock skew correction
author Adam Chlipala <adam@chlipala.net>
date Sun, 21 Aug 2011 11:27:41 -0400
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fun main () : transaction page =
    start <- now;
    deadline <- return (addSeconds start 60);
    cl <- Clock.create 500;
    return <xml><body onload={Clock.start cl}>
      <dyn signal={cl <- Clock.signal cl;
                   return <xml>
                     {[cl]}<br/>
                     {if cl > deadline then
                          <xml><b>Expired</b></xml>
                      else
                          <xml>{[diffInSeconds cl deadline]}</xml>}
                   </xml>}/>
    </body></xml>