Sandbox/68
< Sandbox
<!DOCTYPE html> <html> <head> <script> var c=0; var t; var timer_is_on=0;
function timedCount() { document.getElementById('txt').value=c; c=c+1; t=setTimeout("timedCount()",1000); }
function doTimer() { if (!timer_is_on)
{ timer_is_on=1; timedCount(); }
} </script> </head>
<body> <form> <input type="button" value="Start count!" onClick="doTimer()"> <input type="text" id="txt"> </form>
Click on the button above. The input field will count forever, starting at 0.
</body> </html>