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Seeking javascript timer example that has start & stop buttons

Posted on 2009-07-14
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Last Modified: 2013-11-19
I'm looking for an example of a javascript timer that displays both hours and seconds, and that  increments and displays in realtime.  The example needs to have start / stop buttons on it which start and stop the timer when clicked.  

Thanks,
- Yvan
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Question by:egoselfaxis
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4 Comments
 
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Expert Comment

by:SadafRasheed
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LVL 41

Accepted Solution

by:
HonorGod earned 500 total points
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Like this?
<html>

<body>

<script type='text/javascript'>

  var timerID  = 0;

  var started  = null;

  var target   = null;

  var remnant  = 0;
 

  function field( id ) {

    var ele = document.getElementById( id );

    if ( !ele ) {

      alert( 'Specified element not found. id="' + id + '"' );

    }

    return ele;

  }

  

  function UpdateTimer() {

    function D2( val ) {

      return ( ( val < 10 ) ? '0' : '' ) + val

    }

    

    var S = Math.floor( ( ( new Date() ).getTime() - started.getTime() ) / 1000 );

    var H = Math.floor( S / 3600 );

    S -= H * 3600;

    var M = Math.floor( S / 60 );

    S -= M * 60;

    

//  if ( timer.getSeconds() % 60 == 0 ) {

      target.value = D2( H ) + ':' + D2( M ) + ':' + D2( S );

//  }
 

   // Check once per second

    timerID = setTimeout( 'UpdateTimer()', 1000 );

  }
 

  function enable( id ) {

    var button = field( id );

    if ( button ) {

      button.removeAttribute( 'disabled' );

    }

  }
 

  function disable( id ) {

    var button = field( id );

    if ( button ) {

      button.disabled = 'disabled';

    }

  }
 

  function Start() {

    if ( target ) {

      started  = new Date();

      started.setTime( started.getTime() - ( remnant * 1000 ) );

      timerID  = setTimeout( 'UpdateTimer()', 1000 ) ;

      disable( 'start' );

      enable( 'stop' );

    }

  }
 

  function Stop() {

    clearTimeout( timerID );

    timerID  = 0;

    enable( 'start' );

    disable( 'stop' );

    var HMS = target.value.split( ':' );

    remnant = parseInt( HMS[ 0 ], 10 ) * 3600 + parseInt( HMS[ 1 ], 10 ) * 60 + parseInt( HMS[ 2 ], 10 );

  }

 

  function Reset() {

    target = field( 'Time' );

    if ( target ) {

      target.value = '00:00:00';

      enable( 'start' );

    } else {

      disable( 'start' );

    }

    disable( 'stop' );

  }

  

  function validate( obj ) {

    if ( !/^\d{2}:\d{2}\d{2}$/.test( obj.value ) ) {

      alert( 'Unexpected format: HH:MM:SS' );

      obj.value = '00:00:00';

    }

  }

</script>

<body onload='Reset()' onunload='Stop()'>

  <form name='myTimer'>  

    <input type='text'   id='Time'  size='5' onchange='validate(this.value)'>

    <input type='button' id='start' value='Start' onclick='Start()'>

    <input type='button' id='stop'  value='Stop'  onclick='Stop()'>

  </form>

</body>

</html>

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Author Comment

by:egoselfaxis
Comment Utility
Perfect - thanks!

- Yvan
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LVL 41

Expert Comment

by:HonorGod
Comment Utility
You are very welcome.

Thanks for the grade & points.

Good luck & have a great day.
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