after logout back page in code igniter

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ASKER

the previous pages after logout on my app are having a click action. They shouldn't be allow to click anything after logged out.

What happens when they click? Your page should tell them that they are logged out.

ASKER

it still allow to click and proceed to action

Then your login system is not working. It should be checking the login status on every page.

Loganathan Natarajan

yes, you can lock the browser to back, i handled one project.

That won't fix his login problem. If he can 'back' to the page and have it work, then someone can go directly to the page and make it work. It appears that he is not checking the login on every page.

Loganathan Natarajan

I used this script on my logout and after login page as well. It works fine to me.

<script type="text/javascript">
        window.history.forward();
        function noBack()
        {
            window.history.forward();
        }
</SCRIPT>

</head>
<body onLoad="noBack();" onpageshow="if (event.persisted) noBack();" onUnload="">

Open in new window

The issue here goes to the nature of HTTP requests and browser cache. You can go "back" through browser history and the browser will simply show you the existing content of the cached page. It's not until you deliberately refresh the browser (which causes a new HTTP request) that you see the new state of the request after the logout. Because there are browser settings that come into play, this can be confusing and inconsistent on different client computers. Because clients can disable JavaScript, the JavaScript solutions may not give you 100% coverage. A safer way to do this is to cause the logout script to make an HTTP request after it has cleared the client credentials from the web server.

Here is an article on how to do PHP client authentication. Note that the logout script has an example showing how to redirect the client browser with header(). This will cause the needed HTTP request, and the problem will be solved.
https://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_2391-PHP-login-logout-and-easy-access-control.html

Here is an article describing the nature of the HTTP Client/Server protocols.
https://www.experts-exchange.com/Web_Development/Web_Languages-Standards/A_11271-Understanding-Client-Server-Protocols-and-Web-Applications.html

Here is the minimum information you need to understand about PHP sessions.
https://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_11909-PHP-Sessions-Simpler-Than-You-May-Think.html

ASKER

hmm.. i think i found the solution at Stackoverflow. The reason for my case is due to the browser storing cache and it is a browser nature behaviour. So it has nothing to do with my code.

I use the header to put no-cache on all pages so that and do validation on every pages.

THanks for your time folks.. I suppose I should give you some credit for your efforts.

ASKER

I've requested that this question be closed as follows:

Accepted answer: 0 points for heng tang's comment #a40345593
Assisted answer: 100 points for Loganathan Natarajan's comment #a40343683
Assisted answer: 200 points for Ray Paseur's comment #a40343850

for the following reason:

FOund solution myself

So it has nothing to do with my code.

It has everything to do with your code! Please read the last three lines of the code snippet under the paragraph Client Un-Authentication - the Logout Page

ASKER

this answer leads me to the rigth direction to solve the problem which is to clear the page cache using native PHP

You can't clear the page cache using native PHP. PHP runs on the server. The cache is on the browser.