本文介绍了一个使用JavaScript编写的定时器脚本，该脚本在特定时间后弹出对话框，提供刷新页面或取消的选项。定时器在会话即将过期前给出提示。此外，还详细介绍了如何将此脚本部署到Tomcat服务器上进行测试。
write a javascript timer
requirement:
write a javascript timer: it should alert a dialog after certain timer, the dialog has two buttons. click one of them, the page will refresh automatically; click the other, nothing will happen.
deploy it on tomcat, and test it!
<html>
<head>
<title>Timer</title>
<script language="JavaScript">
<!--
var sessionTime = 7; //Total time of the BusinessObjects session
var alertTime = 5; //Time when pop up a alert dialog
var mm,ss;
var timer;
function alert_Timer()
...{
if(confirm("BusinessObjects session will be timeout in 5 minutes!"))
...{
clearInterval(timer);
window.location.reload();
}
else
...{
clearInterval(timer);
start_Timer();
}
}
function output_status()
...{
mm = Math.floor(sessionTime / 60);
ss = sessionTime % 60;
if( mm == 0)
...{
window.status = "BusinessObjects session will be timeout in " +ss + " seconds!";
if( ss == 0)
window.status = "BusinessObjects session is timeout!";
}
else
...{
window.status = "BusinessObjects session will be timeout in "+ mm + " minutes " + ss + " seconds";
}
}
function start_Timer()
...{
timer = setInterval("countTime();",1000);
output_status();
}
function countTime()
...{
sessionTime -= 1;
if(sessionTime == alertTime)...{
alert_Timer();
}
else if(sessionTime == 0)
...{
clearInterval(timer);
}
output_status();
}
-->
</script>
</head>
<body onLoad="start_Timer();">
</body>
</html>
requirement:
write a javascript timer: it should alert a dialog after certain timer, the dialog has two buttons. click one of them, the page will refresh automatically; click the other, nothing will happen.
deploy it on tomcat, and test it!
<html><head> <title>Timer</title><script language="JavaScript"><!--var sessionTime = 7; //Total time of the BusinessObjects sessionvar alertTime = 5; //Time when pop up a alert dialogvar mm,ss;var timer;function alert_Timer()...{ if(confirm("BusinessObjects session will be timeout in 5 minutes!")) ...{ clearInterval(timer); window.location.reload(); } else ...{ clearInterval(timer); start_Timer(); }}function output_status()...{ mm = Math.floor(sessionTime / 60); ss = sessionTime % 60; if( mm == 0) ...{ window.status = "BusinessObjects session will be timeout in " +ss + " seconds!"; if( ss == 0) window.status = "BusinessObjects session is timeout!"; } else ...{ window.status = "BusinessObjects session will be timeout in "+ mm + " minutes " + ss + " seconds"; }}function start_Timer()...{ timer = setInterval("countTime();",1000); output_status();}function countTime()...{ sessionTime -= 1; if(sessionTime == alertTime)...{ alert_Timer(); } else if(sessionTime == 0) ...{ clearInterval(timer); } output_status();}--></script></head><body onLoad="start_Timer();"></body></html>
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