Want to disable back and refresh button for a website in php using codeigniter.
whenever the person click on browser back button it should not be able to go on the page he visited before.
and does not reload that page once loaded.
hey its not for static page its for dynamic page . attending question on online test. please understand that
There is no way to do that. Except you may show an alert to user, when he tries to close window.
About the alert:
Warn user before leaving web page with unsaved changes
That's imho not possible, and it's good so :) If you want, that your users don't use the back key, write this down as a warning message or something else :)
Check this out Iam not sure this is your actual issue but maybe it will help you out.
Preventing Double submit on refresh/back
Related
I am working on a my site to allow users to take test so they can see how much they know of a particular subject. I am running into a little problem though. Once a user submits the test for grading, how do I prevent them from going back to the test page? I am on a Mac with Safari running and when I click the back button in my web browser after I submit the test it leaves all of the answers I answered filled out. I want it do this: When a user submits a test and they click the back button in their web browser it redirects them to the main test page.
I am using PHP and MYSQL. I even have the test pages setup so that the user must come from a certain url (I am using HTTP_REFERER) and I have tried other stuff such as sessions but I cannot seem to figure this out. Any help is greatly appreciated.
You don't stop them.
Instead change your application so that it still works even if they go back. You can embed a unique number in a hidden field on the page and if they resubmit the same test twice you can detect it and display an appropriate error message. You should also think about what should happen if they modify the unique number.
If you don't want people to post different answers once they have already answered, all you have to do is check, in the script that accepts the test for grading, that the user has never submitted the test before. If you don't, a clever student will always be able to to circumvent your protection by sending an appropriate request directly to that script.
If you don't want people to see previous answers (for instance, if you have two people grade their tests on the same computer), consider using AJAX on the test page to submit the answers and then erase them from the fields. This way, most browsers will not remember the answers and the back button will not un-erase data that was erased by JavaScript.
At the top of the grade page, put the following:
session_start();
$_SESSION['testcomplete'] = 'yes';
Then at the top of each page of the test, put this:
session_start()
if ($_SESSION['testcomplete'] == 'yes') {
header("Location:cheater.php");
}
You could simulate there being no page to go back to. From one page, generate each test page using jQuery, and provide no way to go back, only forward. The back button would take them to the page before they ever launched the test, and you could allow them to launch the test again and generate the right part where they should be. This would be pretty easy, if you haven't gone too far in development the current way.
You could run javascript that clears out all the answers. You might also just allow one submission so that subsequent submissions don't get processed. HTTP_REFERER is usually sent, but can be spoofed and forged by an altered browser.
On the top of the script POST-ing the answers, do a check whether you have the test results in the database for the current user for this test. If you do, redirect to results.
if(get_test_results($user)){
$test_url = get_test_url($user);
header( "Location: $test_url" ) ;
}
Disabling the back button is not a good idea.
I was facing a similar problem making an online examination myself
what I did is
I provided a session variable such that if the user pastes the previous page's URL in the address bar then on loading the page the page is automatically forwards to the next desired page. Whether the page whose URL was mentioned is the being visited the first time or being revisited is determined by the value of the session variable
If the user instead of loading the page does a go back via the browser button the it automatically redirects to the next page in history as :
javascript:window.history.forward(1);
Hope this helps :)
http://www.htmlgoodies.com/tutorials/buttons/article.php/3478911/Disabling-the-Back-Button.htm you should be able to do it in javascript.
I am working on a my site to allow users to take test so they can see how much they know of a particular subject. I am running into a little problem though. Once a user submits the test for grading, how do I prevent them from going back to the test page? I am on a Mac with Safari running and when I click the back button in my web browser after I submit the test it leaves all of the answers I answered filled out. I want it do this: When a user submits a test and they click the back button in their web browser it redirects them to the main test page.
I am using PHP and MYSQL. I even have the test pages setup so that the user must come from a certain url (I am using HTTP_REFERER) and I have tried other stuff such as sessions but I cannot seem to figure this out. Any help is greatly appreciated.
You don't stop them.
Instead change your application so that it still works even if they go back. You can embed a unique number in a hidden field on the page and if they resubmit the same test twice you can detect it and display an appropriate error message. You should also think about what should happen if they modify the unique number.
If you don't want people to post different answers once they have already answered, all you have to do is check, in the script that accepts the test for grading, that the user has never submitted the test before. If you don't, a clever student will always be able to to circumvent your protection by sending an appropriate request directly to that script.
If you don't want people to see previous answers (for instance, if you have two people grade their tests on the same computer), consider using AJAX on the test page to submit the answers and then erase them from the fields. This way, most browsers will not remember the answers and the back button will not un-erase data that was erased by JavaScript.
At the top of the grade page, put the following:
session_start();
$_SESSION['testcomplete'] = 'yes';
Then at the top of each page of the test, put this:
session_start()
if ($_SESSION['testcomplete'] == 'yes') {
header("Location:cheater.php");
}
You could simulate there being no page to go back to. From one page, generate each test page using jQuery, and provide no way to go back, only forward. The back button would take them to the page before they ever launched the test, and you could allow them to launch the test again and generate the right part where they should be. This would be pretty easy, if you haven't gone too far in development the current way.
You could run javascript that clears out all the answers. You might also just allow one submission so that subsequent submissions don't get processed. HTTP_REFERER is usually sent, but can be spoofed and forged by an altered browser.
On the top of the script POST-ing the answers, do a check whether you have the test results in the database for the current user for this test. If you do, redirect to results.
if(get_test_results($user)){
$test_url = get_test_url($user);
header( "Location: $test_url" ) ;
}
Disabling the back button is not a good idea.
I was facing a similar problem making an online examination myself
what I did is
I provided a session variable such that if the user pastes the previous page's URL in the address bar then on loading the page the page is automatically forwards to the next desired page. Whether the page whose URL was mentioned is the being visited the first time or being revisited is determined by the value of the session variable
If the user instead of loading the page does a go back via the browser button the it automatically redirects to the next page in history as :
javascript:window.history.forward(1);
Hope this helps :)
http://www.htmlgoodies.com/tutorials/buttons/article.php/3478911/Disabling-the-Back-Button.htm you should be able to do it in javascript.
Is it possible to redirect users to a page when they click on back button of the browser?
If yes then how can I achieve it?
Thanks
To avoid the "Confirm Form Resubmission" message, you could use the PRG pattern. That way, when clicking the Back button, the user will simply go back to the search form, as expected.
I have been struggling with this problem for quite some time. This afternoon I have been attempting to allow a user to resubmit a form purposefully. People on the internet have posted lots of things on how to get around form submission errors, but none of it has worked for my particular situation. I finally found this message from MMK on it. His solution worked perfectly, if you have to allow a user to go back to a search or something along those lines, I would totally recommend using the GET method even if you are used to using POST. If you are unsure how to exactly, just do some searching on the internet - trust me, it is worth the time.
I'm trying to use the javascript onbeforeunload event to ask the user if they want to exit the page, but I don't want the event to fire (EDIT: "the event" being the dialog box that pops up asking the user to click ok to leave the site or click cancel to stay on the current page) if the user hits the back button since they will be most likely be staying on my site.
So is there a way to tell if a user has hit the back button using javascript or PHP?
I've gotten a solution using a hidden iframe that only works in IE, but I need something that can work for Firefox, Chrome, and Safari if possible.
EDIT: My IE solution works because when the user hits the back button the iframe is sent back but the parent page remains at the same spot. From this I can tell that the user has indeed hit the back button, so I then use history.back(). This little hack doesn't work in any other browser (to my knowledge), so I'm looking for a cross-browser solution.
tl;dr I'm using window.onbeforeunload to pop up a dialog asking users if they want to leave my site or not. I don't want this to pop up when the user hits the back button. How can I tell that the user has hit the back button in their browser?
Thanks,
Rick
Short answer:
No.
Long answer:
Noooooooooooooooooooooooooooo.
please don't try to keep users on your website unless you have a very good reason to. Saving form fields would be an example of a good use. Checking if they're moving on to another website would be a bad use.
People don't travel from page-to-page as much as they did in the early days of the web. Instead they use google and social networks to find interesting pages, and consume separate distinct pieces of information.
You can't know in advance on which page your user will go when he leaves your page. You can't even get the URLs in its current history.
I see no solution to your problem and I doubt there's one, sorry.
If you don't want anything to happen when the user clicks the back button, then you don't necessarily need to determine if the back button has been hit.
Your goal is to determine who will "most likely be staying on [your] site," and create an extra step for everyone who wants to leave. You're trying to interrupt and override the user's expectations of how his browser will behave.
If you really want to do this, have event listeners for all unload events that aren't triggered by the back button: every link on your page, closing the window, etc. It won't be easy, and you won't be able to catch all events. But you're going to be pissing people off unless you have a good reason for doing this, so if it's really important then put the extra effort in.
tl;dr: Add event listeners to everything that isn't the back button and bring up the dialog in the callback function. It will piss people off, though.
I am working on a my site to allow users to take test so they can see how much they know of a particular subject. I am running into a little problem though. Once a user submits the test for grading, how do I prevent them from going back to the test page? I am on a Mac with Safari running and when I click the back button in my web browser after I submit the test it leaves all of the answers I answered filled out. I want it do this: When a user submits a test and they click the back button in their web browser it redirects them to the main test page.
I am using PHP and MYSQL. I even have the test pages setup so that the user must come from a certain url (I am using HTTP_REFERER) and I have tried other stuff such as sessions but I cannot seem to figure this out. Any help is greatly appreciated.
You don't stop them.
Instead change your application so that it still works even if they go back. You can embed a unique number in a hidden field on the page and if they resubmit the same test twice you can detect it and display an appropriate error message. You should also think about what should happen if they modify the unique number.
If you don't want people to post different answers once they have already answered, all you have to do is check, in the script that accepts the test for grading, that the user has never submitted the test before. If you don't, a clever student will always be able to to circumvent your protection by sending an appropriate request directly to that script.
If you don't want people to see previous answers (for instance, if you have two people grade their tests on the same computer), consider using AJAX on the test page to submit the answers and then erase them from the fields. This way, most browsers will not remember the answers and the back button will not un-erase data that was erased by JavaScript.
At the top of the grade page, put the following:
session_start();
$_SESSION['testcomplete'] = 'yes';
Then at the top of each page of the test, put this:
session_start()
if ($_SESSION['testcomplete'] == 'yes') {
header("Location:cheater.php");
}
You could simulate there being no page to go back to. From one page, generate each test page using jQuery, and provide no way to go back, only forward. The back button would take them to the page before they ever launched the test, and you could allow them to launch the test again and generate the right part where they should be. This would be pretty easy, if you haven't gone too far in development the current way.
You could run javascript that clears out all the answers. You might also just allow one submission so that subsequent submissions don't get processed. HTTP_REFERER is usually sent, but can be spoofed and forged by an altered browser.
On the top of the script POST-ing the answers, do a check whether you have the test results in the database for the current user for this test. If you do, redirect to results.
if(get_test_results($user)){
$test_url = get_test_url($user);
header( "Location: $test_url" ) ;
}
Disabling the back button is not a good idea.
I was facing a similar problem making an online examination myself
what I did is
I provided a session variable such that if the user pastes the previous page's URL in the address bar then on loading the page the page is automatically forwards to the next desired page. Whether the page whose URL was mentioned is the being visited the first time or being revisited is determined by the value of the session variable
If the user instead of loading the page does a go back via the browser button the it automatically redirects to the next page in history as :
javascript:window.history.forward(1);
Hope this helps :)
http://www.htmlgoodies.com/tutorials/buttons/article.php/3478911/Disabling-the-Back-Button.htm you should be able to do it in javascript.