Comments on: Keep session alive with Javascript http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/ hot talk about web development Tue, 15 Dec 2009 23:52:27 +0100 http://wordpress.org/?v=2.8.6 hourly 1 By: Mato http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/#comment-11499 Mato Tue, 01 Dec 2009 10:33:45 +0000 http://fabiankoehler.de/wdb/?p=12#comment-11499 Here's a piece of PHP code, that I use to generate 1x1px jpeg image. You can use it with this Michal's JS to keep sessions alive in PHP environment. $img = imagecreate( 1, 1 ); header( "Content-type: image/jpeg" ); imagejpeg($img); imagedestroy($img); Here’s a piece of PHP code, that I use to generate 1×1px jpeg image. You can use it with this Michal’s JS to keep sessions alive in PHP environment.

$img = imagecreate( 1, 1 );
header( “Content-type: image/jpeg” );
imagejpeg($img);
imagedestroy($img);

]]> By: Davin Studer http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/#comment-11255 Davin Studer Wed, 21 Oct 2009 15:08:15 +0000 http://fabiankoehler.de/wdb/?p=12#comment-11255 @Jee Withmosty platforms you cannot just access an image to reset the session. You need to access a page that will cause the server side scripting engine to reset the service. So, you need to access a JSP file. A way you could do it would be to swap the src of an image element with a JSP file that has a date/time stamp query string (to prevent caching). That JSP file would binary read an image file and write it back to the browser with an image content type header. If you are accessing the server side scripting engine that should reset your session. @Jee Withmosty platforms you cannot just access an image to reset the session. You need to access a page that will cause the server side scripting engine to reset the service. So, you need to access a JSP file. A way you could do it would be to swap the src of an image element with a JSP file that has a date/time stamp query string (to prevent caching). That JSP file would binary read an image file and write it back to the browser with an image content type header. If you are accessing the server side scripting engine that should reset your session.

]]> By: Jee http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/#comment-11253 Jee Wed, 21 Oct 2009 11:59:33 +0000 http://fabiankoehler.de/wdb/?p=12#comment-11253 How does this work with JSP/J2EE type application? In my case i need to set the session alive after every 20mins(it is default session out), I tried to use the above mentioned logic and end up with fail. I have the same scenario like user enters data into the form and take rest for a while(may be more than 20min), and when come back and enter more data try to save the doc, it shows the error saying timeout/some session out issue. How to make it work without form submit(i.e., without reload) to server. Thanks, -Jee How does this work with JSP/J2EE type application?
In my case i need to set the session alive after every 20mins(it is default session out), I tried to use the above mentioned logic and end up with fail.

I have the same scenario like user enters data into the form and take rest for a while(may be more than 20min), and when come back and enter more data try to save the doc, it shows the error saying timeout/some session out issue.

How to make it work without form submit(i.e., without reload) to server.

Thanks,
-Jee

]]> By: troy http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/#comment-11010 troy Thu, 20 Aug 2009 09:11:44 +0000 http://fabiankoehler.de/wdb/?p=12#comment-11010 Hi, I have used your code it works in IE 8 ie : reload the image every time it works in local , in IE 8 and Mozilla , but not working in IE 7 .. and also if the project is moved to IIS - wwwroot Directory , you code has not work .. ??? Hi, I have used your code it works in IE 8 ie : reload the image every time

it works in local , in IE 8 and Mozilla , but not working in IE 7 .. and also

if the project is moved to IIS – wwwroot Directory , you code has not work .. ???

]]> By: Davin Studer http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/#comment-10923 Davin Studer Mon, 03 Aug 2009 16:45:51 +0000 http://fabiankoehler.de/wdb/?p=12#comment-10923 Session state is a function of the server side scripting engine, not the web server. So, requesting just an image file will not work. The request has to be passed to the server side scripting engine (i.e. ASP, PHP, ASP.Net, Python, etc.). Session state is a function of the server side scripting engine, not the web server. So, requesting just an image file will not work. The request has to be passed to the server side scripting engine (i.e. ASP, PHP, ASP.Net, Python, etc.).

]]> By: cocowool http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/#comment-10912 cocowool Sat, 01 Aug 2009 15:36:17 +0000 http://fabiankoehler.de/wdb/?p=12#comment-10912 i also failed with PHP on apache, i tried a .php file and it works so i think request a static img file won't work, is that true? i also failed with PHP on apache, i tried a .php file and it works
so i think request a static img file won’t work, is that true?

]]> By: Davin Studer http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/#comment-9657 Davin Studer Wed, 28 Jan 2009 20:37:21 +0000 http://fabiankoehler.de/wdb/?p=12#comment-9657 I also do not think that this would work wiht ASP.Net or PHP on IIS. You would have to use the method that I suggested except the for ASP.Net the file would have to be a aspx file that read the binary image data, and for php it would have to be a php file that does the same. I also do not think that this would work wiht ASP.Net or PHP on IIS. You would have to use the method that I suggested except the for ASP.Net the file would have to be a aspx file that read the binary image data, and for php it would have to be a php file that does the same.

]]> By: Davin Studer http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/#comment-9648 Davin Studer Tue, 20 Jan 2009 00:32:54 +0000 http://fabiankoehler.de/wdb/?p=12#comment-9648 One thing to note is that this will not work with IIS/ASP. The session will not be renewed by simply requesting a .gif file. You have to request an asp file. So, a work around is to create a .asp file that binary reads a .gif file and then binary writes that data out to the request with the appropriate http headers. One thing to note is that this will not work with IIS/ASP. The session will not be renewed by simply requesting a .gif file. You have to request an asp file. So, a work around is to create a .asp file that binary reads a .gif file and then binary writes that data out to the request with the appropriate http headers.

]]> By: Mahesh k. Sharma http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/#comment-9635 Mahesh k. Sharma Tue, 06 Jan 2009 13:32:41 +0000 http://fabiankoehler.de/wdb/?p=12#comment-9635 This concept to live a page is very good. and with this i solved my problem with very efficent way.. thanks i think that it is very uniqe idea ... Thanks This concept to live a page is very good. and with this i solved my problem with very efficent way.. thanks i think that it is very uniqe idea … Thanks

]]> By: Legion http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/#comment-9505 Legion Thu, 09 Oct 2008 21:18:40 +0000 http://fabiankoehler.de/wdb/?p=12#comment-9505 i had same problem in asp.net, try using ajax to retrieve a page you know keeps the session alive like the main page of the site. i had same problem in asp.net, try using ajax to retrieve a page you know keeps the session alive like the main page of the site.

]]>