explain this javascript line of code.

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Hi experts,

please can you explain me this javascript code.

This is code is used for redirecting to login page after 15 minutes, if the user is idle in asp.net project

XML

<script type="text/javascript">
function InitSessionTimer() {
    /* mReschke 2010-09-29 */
    warn_sec = 59 * 60 * 1000;             //Warning time in milliseconds
    timeout_sec = 60 * 60 * 1000;          //Actual timeout in milliseconds
    show_warning = true;
    epoch = new Date().getTime();
    CheckSessionStatus();
}
InitSessionTimer();
function CheckSessionStatus() {
    /* mReschke 2010-09-29 */

    //Check for session warning
    epoch2 = new Date().getTime();
    if (epoch2 > epoch + warn_sec && epoch2 < epoch + timeout_sec && show_warning) {
        show_warning = false; //Don't show again
        alert_shown = true;
        alert("Your session will timeout in " + Math.round((timeout_sec - warn_sec) / 1000) + " minute, please click a button or navigate to another page to refresh your session before it expires.");
        down = setTimeout("CheckSessionStatus();", 1000);
    } else if (epoch2 > epoch + timeout_sec) {
        alert("Sorry, Your session has timed out.");
        window.location.href = 'Login.aspx';
    } else {
        down = setTimeout("CheckSessionStatus();", 1000);
    }
}
</script>

---------------------------------------

please explain me this line of code.

warn_sec = 59 * 60 * 1000;

what is 59, what is 60 and what is 1000 here.

Please explain thanks.

I want to redirect to Login.aspx page if user is idle after 15 minutes.

Posted 20-Aug-13 19:01pm

HYD Webdeveloper

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Comments

Sergey Alexandrovich Kryukov 21-Aug-13 1:16am

Wrong approach in principle. Who knows what kind of trash can you find in the Web? (This 59 vs. 60 looks like yet another stupidity to me, by the way...)

Ask the person who wrote it, or, much better, write your own code.
—SA

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Dineshshp · Answer 1 · 2013-08-20T19:25:00

Solution 1

it will warn upto 59 minutes to click on button and just after 59 minutes it will redirect to login page.

1000 means 1 second
1000 * 60 means 1 minute
1000 * 60 * 59 means 59 minutes

You want code for 15 minutes. okyeee, let me explain

1000 = 1 second (1000 is miliseconds)
1000 * 60 = 60000 miliseconds (60 seconds)
1000 * 60 * 15 = 900000 (15 minutes)

Posted 20-Aug-13 19:25pm

Dineshshp

Updated 20-Aug-13 19:47pm

v2

Comments

HYD Webdeveloper 21-Aug-13 1:40am

how to set 15 minutes....please help

Dineshshp 21-Aug-13 1:44am

You want code for 15 minutes, okyeee, let me explain
1000 means 1 second
1000 * 60 means 1 minute
1000 * 60 * 15 means 15 minutes

1000*60*15 = 900000 (900000 is miliseconds)
900000 / 1000 = 900 seconds
900 / 60 = 15 minutes

Vikas Desai 21-Aug-13 2:02am

15 min = 15 * 60 seconds = 15 * 60 *1000 milliseconds i.e. (900000 milliseconds)

Maciej Los 21-Aug-13 2:06am

+5

Vikas Desai · Answer 2 · 2013-08-20T19:59:00

59 * 60 * 1000
59 is in minutes
60 to covert minutes in seconds
and 1000 to convert the seconds in milliseconds.

To answer why there is 59...

59 is the last number post which it gets converted to Hour (if it would be 60 then it would be counted as hour).
So its 59 there.

warn_sec = 59 * 60 * 1000 - this is to warn on 59th min
timeout_sec = 60 * 60 * 1000 - will time out when it reaches 60th min i.e 1 hour

usually this kind of script is used in cyber cafe now a days to warn the user when it is about to reach an hour.

Thanks7872 · Answer 3 · 2013-08-20T20:04:00

The below code can be used to redirect user after predefined time interval.
Code:

XML

string script = "<SCRIPT Language='JavaScript'> ";
script += "redirection()";
script += "</SCRIPT>";
Page.RegisterClientScriptBlock("ClientScript", script);

Javascript (Add it to the head of the page):

XML

<script type="text/javascript">
     function redirection()
     {
        alert('You wil be redirected to Google.com after 10 seconds.');
        setTimeout("top.location.href = 'http://www.google.com'", 10000);
     }
</script>

Regards..:)

explain this javascript line of code.

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